doc/README: add v0.7.0 download links

Makefile

@@ -1,32 +1,34 @@
 SHELL:=/bin/bash
-
 SOURCES=$(find . -name '*.go' -type f)
+.DEFAULT_GOAL := dist
 
 liblcl-2.2.3.zip:
+	rm -f liblcl-2.2.3.zip
 	wget 'https://github.com/ying32/govcl/releases/download/v2.2.3/liblcl-2.2.3.zip'
 	
 liblcl.so: liblcl-2.2.3.zip
 	echo "154b4e4a1d5137a2ffe51cb4d0bf152dd997c12616ae30862775c0e4f0928e88 liblcl-2.2.3.zip" | sha256sum -c
+	rm -f liblcl.so
 	unzip -j liblcl-2.2.3.zip linux64-gtk2/liblcl.so -d .
 	touch liblcl.so
 
 liblcl.dll: liblcl-2.2.3.zip
 	echo "154b4e4a1d5137a2ffe51cb4d0bf152dd997c12616ae30862775c0e4f0928e88 liblcl-2.2.3.zip" | sha256sum -c
+	rm -f liblcl.dll
 	unzip -j liblcl-2.2.3.zip win64/liblcl.dll -d .
 	touch liblcl.dll
 
 yvbolt: $(SOURCES)
-	GOOS=linux GOARCH=amd64 CGO_ENABLED=1 go build -trimpath -ldflags '-s -w'
+	CGO_CFLAGS='-O2 -Wno-return-local-addr' GOOS=linux GOARCH=amd64 CGO_ENABLED=1 go build -trimpath -ldflags '-s -w'
 	chmod 755 yvbolt
-	upx --best yvbolt
 
 yvbolt.exe: $(SOURCES)
-	GOOS=windows GOARCH=amd64 CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc-win32 go build -trimpath -ldflags '-s -w'
-	upx --best yvbolt.exe
+	CGO_CFLAGS='-O2 -Wno-return-local-addr' GOOS=windows GOARCH=amd64 CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc-win32 go build -trimpath -ldflags '-s -w -H windowsgui'
+	upx --lzma yvbolt.exe
 
 yvbolt.linux64.tar.xz: yvbolt liblcl.so
 	rm -f yvbolt.linux64.tar.xz
-	XZ_OPT='--best' tar caf yvbolt.linux64.tar.xz --owner=0 --group=0 yvbolt liblcl.so
+	XZ_OPT='-T0 -9' tar caf yvbolt.linux64.tar.xz --owner=0 --group=0 yvbolt liblcl.so
 	
 yvbolt.win64.zip: yvbolt.exe liblcl.dll
 	rm -f yvbolt.win64.zip

README.md

@@ -1,13 +1,11 @@
 # yvbolt
 
-A graphical browser for multiple databases using [GoVCL](https://z-kit.cc/en/).
-
-This is an experimental application and you should generally prefer to use [qbolt](https://code.ivysaur.me/qbolt).
+A graphical interface for multiple databases using [GoVCL](https://z-kit.cc/en/).
 
 ## Features
 
 - Native desktop application, running on Linux, Windows, and macOS
-- Connect to multiple databases
+- Connect to multiple databases at once
 - Browse table/bucket content
   - Use context menu to perform special table/bucket actions
 - Run custom SQL queries
@@ -17,11 +15,16 @@ This is an experimental application and you should generally prefer to use [qbol
   - Badger v4
   - Bolt
     - Recursive bucket support
-    - Option to open as readonly
+    - Option to open as readonly for shared access
+    - Supports editing
+    - See also [qbolt](https://code.ivysaur.me/qbolt) for more/different functionality
+  - Debconf
   - Pebble
   - Redis
   - SQLite
     - Drivers: mattn (CGo), modernc.org (no cgo), experimental command-line driver
+    - Supports editing
+    - Integrated vacuum and export commands
 
 ## License
 
@@ -31,7 +34,7 @@ This project redistributes images from the famfamfam/silk icon set under the [CC
 
 This project includes trademarked logo images for each supported database type.
 
-## Usage
+## Compiling
 
 1. `CGO_ENABLED=1 go build`
 2. [Download liblcl](https://github.com/ying32/govcl/releases/download/v2.2.3/liblcl-2.2.3.zip) for your platform, or [compile it yourself](https://github.com/ying32/liblcl) (tested with v2.2.3)
@@ -40,6 +43,34 @@ This project includes trademarked logo images for each supported database type.
 
 ## Changelog
 
+2024-07-18 v0.7.0
+
+- SQLite, Bolt: Initial support for editing data (insert, per-cell update, delete)
+- SQLite: Add context menu actions for compact (vacuum), export, and drop table
+- App: New grid widget
+- App: Add refresh button
+- App: Bigger window size, use icons for toolbars, better UI colours for Windows
+- App: Prevent submitting blank queries to database
+- Refactor database interface and error handling
+
+[⬇️ Download for Windows x86_64](https://git.ivysaur.me/code.ivysaur.me/yvbolt/releases/download/v0.7.0/yvbolt.win64.zip)
+
+[⬇️ Download for Linux x86_64](https://git.ivysaur.me/code.ivysaur.me/yvbolt/releases/download/v0.7.0/yvbolt.linux64.tar.xz)
+
+2024-06-30 v0.6.0
+
+- Debconf: Add as supported database
+- SQLite: Support table names containing special characters
+- SQLite: Improvements for experimental command-line driver 
+- Redis: Improve connection dialog window position
+- App: Cosmetic fixes for frame borders, help dialog, and Windows fonts+colours
+- Build: Change compression parameters for release builds
+- Build: Compile CGO with -O2 for release builds
+
+[⬇️ Download for Windows x86_64](https://git.ivysaur.me/code.ivysaur.me/yvbolt/releases/download/v0.6.0/yvbolt.win64.zip)
+
+[⬇️ Download for Linux x86_64](https://git.ivysaur.me/code.ivysaur.me/yvbolt/releases/download/v0.6.0/yvbolt.linux64.tar.xz)
+
 2024-06-29 v0.5.0
 
 - Pebble: Add as supported database
@@ -53,6 +84,10 @@ This project includes trademarked logo images for each supported database type.
 - App: Add image icons for refresh and close context menu actions
 - Build: Add makefile for cross-compiling release binaries
 
+[⬇️ Download for Windows x86_64](https://git.ivysaur.me/code.ivysaur.me/yvbolt/releases/download/v0.5.0/yvbolt.win64.zip)
+
+[⬇️ Download for Linux x86_64](https://git.ivysaur.me/code.ivysaur.me/yvbolt/releases/download/v0.5.0/yvbolt.linux64.tar.xz)
+
 2024-06-23 v0.4.0
 
 - Redis: Add as supported database

TODO

@@ -1,6 +1,10 @@
-- Insert
-- Update cell
-- Delete row(s)
+- Syntax highlighting in editor
+- Mutation
+	- Get real primary key for mutation instead of string approximation
+	- Badger: Support insert/update/delete
+	- Pebble: Support insert/update/delete
+	- Debconf: Support insert/update/delete
+	- Redis: Support insert/update/delete
 - Binary data viewer
 	- Detect jpg/png and show as image
 - More DB types
@@ -9,26 +13,29 @@
 		- CLI using psql
 	- MSSQL (recursive navigation for instances)
 	- Other K/V stores from https://github.com/smallnest/kvbench 
-- SSH tunnels
-- Badger encryption key dialog
-- Pebble: connection options dialog
-- SQLite: DB compact action
-- SQLite: DB export backup action
-- SQLite: drop table action
-- SQLite: show views, triggers, indexes in nav
+	- Windows registry
+	- LDAP
+- Connection dialog
+	- SSH tunnels
+	- Badger encryption key dialog
+	- Pebble: connection options dialog
 - SQLite CLI driver:
-	- Basic error handling
-	- Better lexing
+	- Context support
 	- Attach to SSH tunnel
 	- Configure binary path
 	- https://ricardoanderegg.com/posts/sqlite-remote-explorer-gui/
 	- https://github.com/litements/litexplore
+- Debconf: separate groups by first slash in name
+- SQLite: drop table doesn't autorefresh nav since callback is late
 - Build
-	- Makefile to cross-compile release binaries in docker
 	- Build own liblcl binaries in docker
 	- Win32 icon resource
+		- https://github.com/ying32/govcl/tree/master/Tools/winRes
 - Performance
 	- Warning if data table is filtered to 1000 rows, or add pagination
 	- Context/interrupt slow queries
 	- Faster virtual rendering
 		- https://github.com/ying32/govcl/blob/master/samples/listviewvirtualdata/main.go
+- Query history
+- Test suite
+	- `CREATE TABLE foo (id integer primary key, aaa text not null, bbb text not null);`

db_badger.go

@@ -7,7 +7,6 @@ import (
 
 	"github.com/dgraph-io/badger/v4"
 	"github.com/ying32/govcl/vcl"
-	"github.com/ying32/govcl/vcl/types"
 )
 
 type badgerLoadedDatabase struct {
@@ -34,7 +33,7 @@ func (ld *badgerLoadedDatabase) Keepalive(ndata *navData) {
 	ld.arena = append(ld.arena, ndata)
 }
 
-func (ld *badgerLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+func (ld *badgerLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
 
 	// Load properties
 
@@ -42,25 +41,15 @@ func (ld *badgerLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 	f.propertiesBox.SetText(content)
 
 	// Load data
-
-	f.contentBox.SetEnabled(false)
-	f.contentBox.Clear()
-
 	// Badger always uses Key + Value as the columns
 
-	f.contentBox.Columns().Clear()
 	colKey := f.contentBox.Columns().Add()
-	colKey.SetCaption("Key")
-	colKey.SetWidth(MY_WIDTH)
-	colKey.SetAlignment(types.TaLeftJustify)
+	colKey.Title().SetCaption("Key")
 	colVal := f.contentBox.Columns().Add()
-	colVal.SetCaption("Value")
+	colVal.Title().SetCaption("Value")
 
 	err := ld.db.View(func(txn *badger.Txn) error {
 
-		// Valid
-		f.contentBox.Clear()
-
 		// Create iterator
 		opts := badger.DefaultIteratorOptions
 		opts.PrefetchSize = 64
@@ -71,9 +60,10 @@ func (ld *badgerLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 			item := it.Item()
 			k := item.Key()
 			err := item.Value(func(v []byte) error {
-				dataEntry := f.contentBox.Items().Add()
-				dataEntry.SetCaption(formatUtf8(k))
-				dataEntry.SubItems().Add(formatUtf8(v))
+				rpos := f.contentBox.RowCount()
+				f.contentBox.SetRowCount(rpos + 1)
+				f.contentBox.SetCells(0, rpos, formatUtf8(k))
+				f.contentBox.SetCells(1, rpos, formatUtf8(v))
 
 				return nil
 			})
@@ -84,12 +74,13 @@ func (ld *badgerLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 		return nil
 	})
 	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to load data: %s", err.Error()))
-		return
+		return err
 	}
 
 	// Valid
+	vcl_stringgrid_columnwidths(f.contentBox)
 	f.contentBox.SetEnabled(true)
+	return nil
 }
 
 func (ld *badgerLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
@@ -107,10 +98,6 @@ func (ld *badgerLoadedDatabase) NavContext(ndata *navData) ([]contextAction, err
 	return nil, nil // No special actions are supported
 }
 
-func (ld *badgerLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
-	vcl.ShowMessage("Badger doesn't support querying")
-}
-
 func (ld *badgerLoadedDatabase) Close() {
 	_ = ld.db.Close()
 	ld.arena = nil

db_bolt.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"path/filepath"
 	"sort"
@@ -9,11 +10,14 @@ import (
 	"unsafe"
 
 	"github.com/ying32/govcl/vcl"
-	"github.com/ying32/govcl/vcl/types"
 	"go.etcd.io/bbolt"
 	"go.etcd.io/bbolt/version"
 )
 
+const (
+	boltFilter = "Bolt database|*.db|All files|*.*"
+)
+
 type boltLoadedDatabase struct {
 	displayName string
 	path        string
@@ -39,7 +43,7 @@ func (ld *boltLoadedDatabase) Keepalive(ndata *navData) {
 	ld.arena = append(ld.arena, ndata)
 }
 
-func (ld *boltLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+func (ld *boltLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
 
 	// Load properties
 
@@ -48,19 +52,11 @@ func (ld *boltLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 	f.propertiesBox.SetText(content)
 
 	// Load data
-
-	f.contentBox.SetEnabled(false)
-	f.contentBox.Clear()
-
 	// Bolt always uses Key + Value as the columns
-
-	f.contentBox.Columns().Clear()
 	colKey := f.contentBox.Columns().Add()
-	colKey.SetCaption("Key")
-	colKey.SetWidth(MY_WIDTH)
-	colKey.SetAlignment(types.TaLeftJustify)
+	colKey.Title().SetCaption("Key")
 	colVal := f.contentBox.Columns().Add()
-	colVal.SetCaption("Value")
+	colVal.Title().SetCaption("Value")
 
 	err := ld.db.View(func(tx *bbolt.Tx) error {
 		b := boltTargetBucket(tx, ndata.bucketPath)
@@ -70,23 +66,74 @@ func (ld *boltLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 		}
 
 		// Valid
-		f.contentBox.Clear()
-
 		c := b.Cursor()
 		for k, v := c.First(); k != nil; k, v = c.Next() {
-			dataEntry := f.contentBox.Items().Add()
-			dataEntry.SetCaption(formatUtf8(k))
-			dataEntry.SubItems().Add(formatUtf8(v))
+			rpos := f.contentBox.RowCount()
+			f.contentBox.SetRowCount(rpos + 1)
+			f.contentBox.SetCells(0, rpos, formatUtf8(k))
+			f.contentBox.SetCells(1, rpos, formatUtf8(v))
 		}
 		return nil
 	})
 	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to load data for bucket %q: %s", bucketDisplayName, err.Error()))
-		return
+		return err
 	}
 
 	// Valid
+	vcl_stringgrid_columnwidths(f.contentBox)
 	f.contentBox.SetEnabled(true)
+	return nil
+}
+
+func (n *boltLoadedDatabase) ApplyChanges(f *TMainForm, ndata *navData) error {
+	if n.db.IsReadOnly() {
+		return errors.New("Database was opened read-only")
+	}
+
+	// We have rendered row IDs, need to convert back to a bolt primary key
+	// TODO stash the real key inside f.contentBox.Objects()
+	// FIXME breaks if you try and edit the primary key(!)
+	primaryKeyForRendered := func(rowid int32) []byte {
+		return []byte(f.contentBox.Cells(0, rowid))
+	}
+
+	return n.db.Update(func(tx *bbolt.Tx) error {
+
+		// Get current bucket handle
+		b := boltTargetBucket(tx, ndata.bucketPath)
+
+		// Edit
+		for rowid, _ /*editcells*/ := range f.updateRows {
+			k := primaryKeyForRendered(rowid)
+			v := f.contentBox.Cells(1, rowid) // There's only one value cell
+			err := b.Put(k, []byte(v))
+			if err != nil {
+				return fmt.Errorf("Updating cell %q: %w", formatUtf8(k), err)
+			}
+		}
+
+		// Delete by key (affects rowids after re-render)
+		for rowid, _ := range f.deleteRows {
+			k := primaryKeyForRendered(rowid)
+			err := b.Delete(k)
+			if err != nil {
+				return fmt.Errorf("Deleting cell %q: %w", formatUtf8(k), err)
+			}
+		}
+
+		// Insert all new entries
+		for rowid, _ := range f.insertRows {
+			k := primaryKeyForRendered(rowid)
+			v := f.contentBox.Cells(1, rowid) // There's only one value cell
+			err := b.Put(k, []byte(v))
+			if err != nil {
+				return fmt.Errorf("Inserting cell %q: %w", formatUtf8(k), err)
+			}
+		}
+
+		// Done
+		return nil
+	})
 }
 
 func (ld *boltLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
@@ -100,13 +147,14 @@ func (ld *boltLoadedDatabase) NavContext(ndata *navData) (ret []contextAction, e
 	if len(ndata.bucketPath) > 0 {
 		ret = append(ret, contextAction{"Delete bucket", ld.DeleteBucket})
 	}
+
 	return
 }
 
-func (ld *boltLoadedDatabase) AddChildBucket(ndata *navData) {
+func (ld *boltLoadedDatabase) AddChildBucket(sender vcl.IComponent, ndata *navData) error {
 	bucketName := ""
 	if !vcl.InputQuery(APPNAME, "Enter a name for the new bucket:", &bucketName) {
-		return // cancel
+		return nil // cancel
 	}
 
 	err := ld.db.Update(func(tx *bbolt.Tx) error {
@@ -121,11 +169,12 @@ func (ld *boltLoadedDatabase) AddChildBucket(ndata *navData) {
 		return err
 	})
 	if err != nil {
-		vcl.ShowMessageFmt("Error adding bucket: %v", err)
+		return fmt.Errorf("Error adding bucket: %w", err)
 	}
+	return nil
 }
 
-func (ld *boltLoadedDatabase) DeleteBucket(ndata *navData) {
+func (ld *boltLoadedDatabase) DeleteBucket(sender vcl.IComponent, ndata *navData) error {
 	err := ld.db.Update(func(tx *bbolt.Tx) error {
 		// Find parent of this bucket.
 		if len(ndata.bucketPath) >= 2 {
@@ -138,12 +187,9 @@ func (ld *boltLoadedDatabase) DeleteBucket(ndata *navData) {
 		}
 	})
 	if err != nil {
-		vcl.ShowMessageFmt("Error deleting bucket %q: %v", strings.Join(ndata.bucketPath, `/`), err)
+		return fmt.Errorf("Error deleting bucket %q: %w", strings.Join(ndata.bucketPath, `/`), err)
 	}
-}
-
-func (ld *boltLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
-	vcl.ShowMessage("Bolt doesn't support querying")
+	return nil
 }
 
 func (ld *boltLoadedDatabase) Close() {

db_debconf.go

@@ -0,0 +1,132 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"unsafe"
+
+	"yvbolt/debconf"
+
+	"github.com/ying32/govcl/vcl"
+)
+
+type debconfLoadedDatabase struct {
+	displayName string
+	db          *debconf.Database
+	nav         *vcl.TTreeNode
+
+	arena []*navData // keepalive
+}
+
+func (ld *debconfLoadedDatabase) DisplayName() string {
+	return ld.displayName
+}
+
+func (ld *debconfLoadedDatabase) DriverName() string {
+	return "debconf"
+}
+
+func (ld *debconfLoadedDatabase) RootElement() *vcl.TTreeNode {
+	return ld.nav
+}
+
+func (ld *debconfLoadedDatabase) Keepalive(ndata *navData) {
+	ld.arena = append(ld.arena, ndata)
+}
+
+func (ld *debconfLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
+
+	// Load properties
+
+	content := fmt.Sprintf("Entries: %d\nUnique attributes: %d\n", len(ld.db.Entries), len(ld.db.AllColumnNames))
+	f.propertiesBox.SetText(content)
+
+	// Load data
+
+	indexes := make(map[string]int)
+
+	for i, cname := range ld.db.AllColumnNames {
+		indexes[cname] = i
+
+		col := f.contentBox.Columns().Add()
+		col.Title().SetCaption(cname)
+	}
+
+	for _, entry := range ld.db.Entries {
+
+		rpos := f.contentBox.RowCount()
+		f.contentBox.SetRowCount(rpos + 1)
+		f.contentBox.SetCells(0, rpos, entry.Name)
+
+		for _, proppair := range entry.Properties {
+			f.contentBox.SetCells(int32(indexes[proppair[0]]), rpos, proppair[1])
+		}
+	}
+
+	// Valid
+	vcl_stringgrid_columnwidths(f.contentBox)
+	f.contentBox.SetEnabled(true)
+	return nil
+}
+
+func (ld *debconfLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
+	// In the debconf implementation, there is only one child: "Data"
+	if len(ndata.bucketPath) == 0 {
+		return []string{"Data"}, nil
+
+	} else {
+		// No children deeper than that
+		return []string{}, nil
+	}
+}
+
+func (ld *debconfLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
+	return nil, nil // No special actions are supported
+}
+
+func (ld *debconfLoadedDatabase) Close() {
+	ld.arena = nil
+}
+
+var _ loadedDatabase = &debconfLoadedDatabase{} // interface assertion
+
+//
+
+func (f *TMainForm) debconfAddDatabaseFrom(path string) {
+	// TODO load in background thread to stop blocking the UI
+
+	fh, err := os.OpenFile(path, os.O_RDONLY, 0400)
+	if err != nil {
+		vcl.ShowMessage(fmt.Sprintf("Failed to load database: %s", err.Error()))
+		return
+	}
+	defer fh.Close()
+
+	db, err := debconf.Parse(fh)
+	if err != nil {
+		vcl.ShowMessage(fmt.Sprintf("Failed to load database: %s", err.Error()))
+		return
+	}
+
+	ld := &debconfLoadedDatabase{
+		db:          db,
+		displayName: filepath.Base(path),
+	}
+
+	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
+	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
+	ld.nav.SetImageIndex(imgDatabase)
+	ld.nav.SetSelectedIndex(imgDatabase)
+	navData := &navData{
+		ld:             ld,
+		childrenLoaded: false,      // will be loaded dynamically
+		bucketPath:     []string{}, // empty = root
+	}
+	ld.nav.SetData(unsafe.Pointer(navData))
+
+	f.dbs = append(f.dbs, ld)
+	f.Buckets.SetSelected(ld.nav) // Select new element
+
+	ld.Keepalive(navData)
+}

db_none.go

@@ -18,13 +18,9 @@ func (n *noLoadedDatabase) RootElement() *vcl.TTreeNode {
 	return nil
 }
 
-func (n *noLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+func (n *noLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
 	f.propertiesBox.SetText("Open a database to get started...")
-	f.contentBox.SetEnabled(false)
-	f.contentBox.Clear()
-}
-
-func (n *noLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
+	return nil
 }
 
 func (n *noLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {

db_pebble.go

@@ -9,7 +9,6 @@ import (
 	"github.com/cockroachdb/pebble"
 	"github.com/cockroachdb/pebble/vfs"
 	"github.com/ying32/govcl/vcl"
-	"github.com/ying32/govcl/vcl/types"
 )
 
 type pebbleLoadedDatabase struct {
@@ -36,7 +35,7 @@ func (ld *pebbleLoadedDatabase) Keepalive(ndata *navData) {
 	ld.arena = append(ld.arena, ndata)
 }
 
-func (ld *pebbleLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+func (ld *pebbleLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
 
 	ctx := context.Background()
 
@@ -46,19 +45,12 @@ func (ld *pebbleLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 	f.propertiesBox.SetText(content)
 
 	// Load data
-
-	f.contentBox.SetEnabled(false)
-	f.contentBox.Clear()
-
 	// pebble always uses Key + Value as the columns
 
-	f.contentBox.Columns().Clear()
 	colKey := f.contentBox.Columns().Add()
-	colKey.SetCaption("Key")
-	colKey.SetWidth(MY_WIDTH)
-	colKey.SetAlignment(types.TaLeftJustify)
+	colKey.Title().SetCaption("Key")
 	colVal := f.contentBox.Columns().Add()
-	colVal.SetCaption("Value")
+	colVal.Title().SetCaption("Value")
 
 	itr := ld.db.NewIterWithContext(ctx, nil)
 	defer itr.Close()
@@ -67,17 +59,19 @@ func (ld *pebbleLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 		k := itr.Key()
 		v, err := itr.ValueAndErr()
 		if err != nil {
-			vcl.ShowMessage(fmt.Sprintf("Failed to load data for key %q: %s", formatAny(k), err.Error()))
-			return
+			return fmt.Errorf("Failed to load data for key %q: %w", formatAny(k), err)
 		}
 
-		dataEntry := f.contentBox.Items().Add()
-		dataEntry.SetCaption(formatUtf8(k))
-		dataEntry.SubItems().Add(formatUtf8(v))
+		rpos := f.contentBox.RowCount()
+		f.contentBox.SetRowCount(rpos + 1)
+		f.contentBox.SetCells(0, rpos, formatUtf8(k))
+		f.contentBox.SetCells(0, rpos, formatUtf8(v))
 	}
 
 	// Valid
+	vcl_stringgrid_columnwidths(f.contentBox)
 	f.contentBox.SetEnabled(true)
+	return nil
 }
 
 func (ld *pebbleLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
@@ -95,10 +89,6 @@ func (ld *pebbleLoadedDatabase) NavContext(ndata *navData) ([]contextAction, err
 	return nil, nil // No special actions are supported
 }
 
-func (ld *pebbleLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
-	vcl.ShowMessage("pebble doesn't support querying")
-}
-
 func (ld *pebbleLoadedDatabase) Close() {
 	_ = ld.db.Close()
 	ld.arena = nil

db_redis.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/redis/go-redis/v9"
 	"github.com/ying32/govcl/vcl"
-	"github.com/ying32/govcl/vcl/types"
 )
 
 type redisLoadedDatabase struct {
@@ -41,83 +40,71 @@ func (ld *redisLoadedDatabase) Keepalive(ndata *navData) {
 	ld.arena = append(ld.arena, ndata)
 }
 
-func (ld *redisLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+func (ld *redisLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
 	ctx := context.Background()
 
 	if len(ndata.bucketPath) == 0 {
 		// Top-level: Show info() on main Properties tab
 		infostr, err := ld.db.Info(ctx).Result()
 		if err != nil {
-			vcl.ShowMessage(fmt.Sprintf("Retreiving database info: %v", err))
-			return
+			return fmt.Errorf("Retreiving database info: %w", err)
 		}
 
 		f.propertiesBox.SetText(infostr)
 
-		// Disable data tab
-		f.contentBox.SetEnabled(false)
-		f.contentBox.Clear()
+		// Leave data tab disabled (default behaviour)
+		return nil
 
 	} else if len(ndata.bucketPath) == 1 {
 		// One selected database
 		// Figure out its content
 		err := ld.db.Do(ctx, "SELECT", ndata.bucketPath[0]).Err()
 		if err != nil {
-			vcl.ShowMessage(fmt.Sprintf("Switching to database %q: %v", ndata.bucketPath[0], err))
-			return
+			return fmt.Errorf("Switching to database %q: %w", ndata.bucketPath[0], err)
 		}
 
 		allKeys, err := ld.db.Keys(ctx, "*").Result()
 		if err != nil {
-			vcl.ShowMessage(fmt.Sprintf("Listing keys in database %q: %v", ndata.bucketPath[0], err))
-			return
+			return fmt.Errorf("Listing keys in database %q: %w", ndata.bucketPath[0], err)
 		}
 
 		f.propertiesBox.SetText(fmt.Sprintf("Database %s\nTotal keys: %d\n", ndata.bucketPath[0], len(allKeys)))
 
 		// Redis always uses Key + Value as the columns
 
-		f.contentBox.SetEnabled(false)
-		f.contentBox.Clear()
-
-		f.contentBox.Columns().Clear()
 		colKey := f.contentBox.Columns().Add()
-		colKey.SetCaption("Key")
-		colKey.SetWidth(MY_WIDTH)
-		colKey.SetAlignment(types.TaLeftJustify)
+		colKey.Title().SetCaption("Key")
 		colType := f.contentBox.Columns().Add()
-		colType.SetCaption("Type")
+		colType.Title().SetCaption("Type")
 		colVal := f.contentBox.Columns().Add()
-		colVal.SetCaption("Value")
+		colVal.Title().SetCaption("Value")
 
 		for _, key := range allKeys {
 			typeName, err := ld.db.Type(ctx, key).Result()
 			if err != nil {
-				vcl.ShowMessage(fmt.Sprintf("Loading %q/%q: %v", ndata.bucketPath[0], key, err))
-				return
+				return fmt.Errorf("Loading %q/%q: %w", ndata.bucketPath[0], key, err)
 			}
 
-			dataEntry := f.contentBox.Items().Add()
-			dataEntry.SetCaption(key) // formatUtf8
-			dataEntry.SubItems().Add(typeName)
+			rpos := f.contentBox.RowCount()
+			f.contentBox.SetRowCount(rpos + 1)
+			f.contentBox.SetCells(0, rpos, formatUtf8([]byte(key)))
+			f.contentBox.SetCells(1, rpos, typeName)
 
 			switch typeName {
 			case "string":
 				val, err := ld.db.Get(ctx, key).Result()
 				if err != nil {
-					vcl.ShowMessage(fmt.Sprintf("Loading %q/%q: %v", ndata.bucketPath[0], key, err))
-					return
+					return fmt.Errorf("Loading %q/%q: %w", ndata.bucketPath[0], key, err)
 				}
-				dataEntry.SubItems().Add(val)
+				f.contentBox.SetCells(2, rpos, val)
 
 			case "hash":
 				val, err := ld.db.HGetAll(ctx, key).Result()
 				if err != nil {
-					vcl.ShowMessage(fmt.Sprintf("Loading %q/%q: %v", ndata.bucketPath[0], key, err))
-					return
+					return fmt.Errorf("Loading %q/%q: %w", ndata.bucketPath[0], key, err)
 				}
 				// It's a map[string]string
-				dataEntry.SubItems().Add(formatAny(val))
+				f.contentBox.SetCells(2, rpos, formatAny(val))
 
 			case "lists":
 				fallthrough
@@ -129,17 +116,18 @@ func (ld *redisLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 				fallthrough
 
 			default:
-				dataEntry.SubItems().Add("<<<other object type>>>")
+				f.contentBox.SetCells(2, rpos, "<<<other object type>>>")
 			}
 
 		}
 
 		// Valid
+		vcl_stringgrid_columnwidths(f.contentBox)
 		f.contentBox.SetEnabled(true)
+		return nil
 
 	} else {
-		vcl.ShowMessage(fmt.Sprintf("Unexpected nav position %q", ndata.bucketPath))
-		return
+		return fmt.Errorf("Unexpected nav position %q", ndata.bucketPath)
 
 	}
 }
@@ -170,48 +158,50 @@ func (ld *redisLoadedDatabase) NavContext(ndata *navData) ([]contextAction, erro
 	return nil, nil // No special actions are supported
 }
 
-func (ld *redisLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
+func (ld *redisLoadedDatabase) ExecQuery(query string, resultArea *vcl.TStringGrid) error {
 	ctx := context.Background()
 
 	// Need to parse the query into separate string+args fields for the protocol
 	fields, err := lexer.Fields(query)
 	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Parsing the query: %v", err))
-		return
+		return fmt.Errorf("Parsing the query: %w", err)
 	}
 
 	fields_boxed := box_interface(fields)
 
 	ret, err := ld.db.Do(ctx, fields_boxed...).Result()
 	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("The redis query returned an error: %v", err))
-		return
+		return fmt.Errorf("The redis query returned an error: %w", err)
 	}
 
-	resultArea.SetEnabled(false)
-	resultArea.Clear()
+	vcl_stringgrid_clear(resultArea)
 
-	resultArea.Columns().Clear()
 	colVal := resultArea.Columns().Add()
-	colVal.SetCaption("Result")
+	colVal.Title().SetCaption("Result")
 
 	// The result is probably a single value or a string slice
 	switch ret := ret.(type) {
 	case []string:
 		// Multiple values
 		for _, single := range ret {
-			cell := resultArea.Items().Add()
-			cell.SetCaption(single) // formatUtf8
+
+			rpos := resultArea.RowCount()
+			resultArea.SetRowCount(rpos + 1)
+			resultArea.SetCells(0, rpos, formatUtf8([]byte(single)))
 		}
 
 	default:
 		// Single value
-		dataEntry := resultArea.Items().Add()
-		dataEntry.SetCaption(formatAny(ret)) // formatUtf8
+		rpos := resultArea.RowCount()
+		resultArea.SetRowCount(rpos + 1)
+		resultArea.SetCells(0, rpos, formatAny(ret)) // formatUtf8
 
 	}
 
+	vcl_stringgrid_columnwidths(resultArea)
 	resultArea.SetEnabled(true)
+
+	return nil
 }
 
 func (ld *redisLoadedDatabase) Close() {

db_sqlite.go

@@ -1,19 +1,22 @@
 package main
 
 import (
+	"context"
 	"database/sql"
+	"errors"
 	"fmt"
 	"path/filepath"
+	"strings"
 	"unsafe"
 
 	_ "yvbolt/sqliteclidriver"
 
 	"github.com/ying32/govcl/vcl"
-	"github.com/ying32/govcl/vcl/types"
 )
 
 const (
 	sqliteTablesCaption = "Tables"
+	sqliteFilter        = "SQLite database|*.db;*.db3;*.sqlite;*.sqlite3|All files|*.*"
 )
 
 type sqliteLoadedDatabase struct {
@@ -37,19 +40,17 @@ func (ld *sqliteLoadedDatabase) Keepalive(ndata *navData) {
 	ld.arena = append(ld.arena, ndata)
 }
 
-func (ld *sqliteLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+func (ld *sqliteLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
 
 	if len(ndata.bucketPath) == 0 {
 		// Top-level
 		f.propertiesBox.SetText("Please select...")
-		f.contentBox.SetEnabled(false)
-		f.contentBox.Clear()
+		return nil
 
 	} else if len(ndata.bucketPath) == 1 {
 		// Category (tables, ...)
 		f.propertiesBox.SetText("Please select...")
-		f.contentBox.SetEnabled(false)
-		f.contentBox.Clear()
+		return nil
 
 	} else if len(ndata.bucketPath) == 2 && ndata.bucketPath[0] == sqliteTablesCaption {
 		// Render for specific table
@@ -66,17 +67,13 @@ func (ld *sqliteLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 		// Display table properties
 		f.propertiesBox.SetText(fmt.Sprintf("Selected table %q\n\nSchema:\n\n%s", tableName, schemaStmt))
 
-		f.contentBox.SetEnabled(false)
-		f.contentBox.Clear()
-
 		// Load column details
 		// Use SELECT form instead of common PRAGMA table_info so we can just get names
 		// We could possibly get this from the main data select, but this will
 		// work even when there are 0 results
 		columnNames, err := ld.sqliteGetColumnNamesForTable(tableName)
 		if err != nil {
-			vcl.ShowMessageFmt("Failed to load columns for table %q: %s", tableName, err.Error())
-			return
+			return fmt.Errorf("Failed to load columns for table %q: %w", tableName)
 		}
 
 		populateColumns(columnNames, f.contentBox)
@@ -85,19 +82,21 @@ func (ld *sqliteLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 		// TODO
 
 		// Select * with small limit
-		datar, err := ld.db.Query(`SELECT * FROM ` + tableName + ` LIMIT 1000`) // WARNING can't prepare this parameter, but it comes from the DB (trusted)
+		datar, err := ld.db.Query(`SELECT * FROM "` + tableName + `" LIMIT 1000`) // WARNING can't prepare this parameter, but it comes from the DB (trusted)
 		if err != nil {
-			vcl.ShowMessageFmt("Failed to load data for table %q: %s", tableName, err.Error())
-			return
+			return fmt.Errorf("Failed to load data for table %q: %w", tableName, err)
 		}
 		defer datar.Close()
 		populateRows(datar, f.contentBox)
 
 		// We successfully populated the data grid
+		vcl_stringgrid_columnwidths(f.contentBox)
 		f.contentBox.SetEnabled(true)
+		return nil
 
 	} else {
 		// ??? unknown
+		return errors.New("?")
 
 	}
 
@@ -129,17 +128,14 @@ func (ld *sqliteLoadedDatabase) sqliteGetColumnNamesForTable(tableName string) (
 	return ret, nil
 }
 
-func populateColumns(names []string, dest *vcl.TListView) {
-	dest.Columns().Clear()
+func populateColumns(names []string, dest *vcl.TStringGrid) {
 	for _, columnName := range names {
 		col := dest.Columns().Add()
-		col.SetCaption(columnName)
-		col.SetWidth(MY_WIDTH)
-		col.SetAlignment(types.TaLeftJustify)
+		col.Title().SetCaption(columnName)
 	}
 }
 
-func populateRows(rr *sql.Rows, dest *vcl.TListView) {
+func populateRows(rr *sql.Rows, dest *vcl.TStringGrid) {
 
 	numColumns := int(dest.Columns().Count())
 
@@ -156,10 +152,10 @@ func populateRows(rr *sql.Rows, dest *vcl.TListView) {
 			return
 		}
 
-		dataEntry := dest.Items().Add()
-		dataEntry.SetCaption(formatAny(fields[0]))
-		for i := 1; i < len(fields); i += 1 {
-			dataEntry.SubItems().Add(formatAny(fields[i]))
+		rpos := dest.RowCount()
+		dest.SetRowCount(rpos + 1)
+		for i := 0; i < len(fields); i += 1 {
+			dest.SetCells(int32(i), rpos, formatAny(fields[i]))
 		}
 
 	}
@@ -169,29 +165,149 @@ func populateRows(rr *sql.Rows, dest *vcl.TListView) {
 	}
 }
 
-func (ld *sqliteLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
+func (ld *sqliteLoadedDatabase) ExecQuery(query string, resultArea *vcl.TStringGrid) error {
 	rr, err := ld.db.Query(query)
 	if err != nil {
-		vcl.ShowMessage(err.Error())
-		return
+		return err
 	}
 
 	defer rr.Close()
 
-	resultArea.SetEnabled(false)
-	resultArea.Clear()
+	vcl_stringgrid_clear(resultArea)
 
 	columns, err := rr.Columns()
 	if err != nil {
-		vcl.ShowMessage(err.Error())
-		return
+		return err
 	}
 
 	populateColumns(columns, resultArea)
 
 	populateRows(rr, resultArea)
 
+	vcl_stringgrid_columnwidths(resultArea)
 	resultArea.SetEnabled(true)
+	return nil
+}
+
+func (n *sqliteLoadedDatabase) ApplyChanges(f *TMainForm, ndata *navData) (retErr error) {
+
+	if len(ndata.bucketPath) != 2 {
+		return errors.New("invalid selection")
+	}
+	tableName := ndata.bucketPath[1]
+
+	// We have rendered row IDs, need to convert back to an SQLite primary key
+	// TODO stash the real key inside f.contentBox.Objects()
+	// FIXME breaks if you try and edit the primary key(!)
+
+	ctx := context.Background()
+
+	tx, err := n.db.BeginTx(ctx, nil)
+	if err != nil {
+		return err
+	}
+
+	var commitOK bool = false
+	defer func() {
+		if !commitOK {
+			err := tx.Rollback()
+			if err != nil {
+				retErr = err
+			}
+		}
+	}()
+
+	// Data grid properties
+	var columnNames []string
+	for i := int32(0); i < f.contentBox.ColCount(); i++ {
+		columnNames = append(columnNames, f.contentBox.Columns().Items(i).Title().Caption())
+	}
+
+	// Query sqlite table metadata to determine which of these is the PRIMARY KEY
+	var primaryColumnName string
+	err = tx.QueryRowContext(ctx, `SELECT l.name FROM pragma_table_info(?) as l WHERE l.pk = 1;`, tableName).Scan(&primaryColumnName)
+	if err != nil {
+		return fmt.Errorf("Finding primary key for update: %w", err)
+	}
+
+	// Convert it to an index
+	var primaryColumnIdx int = -1
+	for i := 0; i < len(columnNames); i++ {
+		if columnNames[i] == primaryColumnName {
+			primaryColumnIdx = i
+			break
+		}
+	}
+	if primaryColumnIdx == -1 {
+		return fmt.Errorf("Primary key %q missing from available columns", primaryColumnName)
+	}
+
+	// SQLite can only LIMIT 1 on update/delete if it was compiled with
+	// SQLITE_ENABLE_UPDATE_DELETE_LIMIT, which isn't the case for the mattn
+	// cgo library
+	// Skip that, and just rely on primary key uniqueness
+
+	// Edit
+	for rowid, editcells := range f.updateRows {
+		stmt := `UPDATE "` + tableName + `" SET `
+		params := []interface{}{} // FIXME reinstate types for the driver (although SQLite doesn't mind)
+
+		for ct, cell := range editcells {
+			if ct > 0 {
+				stmt += `, `
+			}
+			stmt += `"` + columnNames[cell] + `" = ?`
+			params = append(params, f.contentBox.Cells(cell, rowid))
+		}
+		stmt += ` WHERE "` + primaryColumnName + `" = ?`
+		pkVal := f.contentBox.Cells(int32(primaryColumnIdx), rowid)
+		params = append(params, pkVal)
+
+		_, err = tx.ExecContext(ctx, stmt, params...)
+		if err != nil {
+			return fmt.Errorf("Updating row %q: %w", pkVal, err)
+		}
+	}
+
+	// Delete by key (affects rowids after re-render)
+	for rowid, _ := range f.deleteRows {
+		pkVal := f.contentBox.Cells(int32(primaryColumnIdx), rowid)
+
+		stmt := `DELETE FROM "` + tableName + `" WHERE "` + primaryColumnName + `" = ?`
+
+		_, err = tx.ExecContext(ctx, stmt, pkVal)
+		if err != nil {
+			return fmt.Errorf("Deleting row %q: %w", pkVal, err)
+		}
+	}
+
+	// Insert all new entries
+	for rowid, _ := range f.insertRows {
+		stmt := `INSERT INTO "` + tableName + `" (` + strings.Join(columnNames, `, `) + `) VALUES (`
+		params := []interface{}{} // FIXME reinstate types for the driver (although SQLite doesn't mind)
+
+		for colid := 0; colid < len(columnNames); colid++ {
+			if colid > 0 {
+				stmt += `, `
+			}
+			stmt += "?"
+			params = append(params, f.contentBox.Cells(int32(colid), rowid))
+		}
+		stmt += `)`
+
+		_, err = tx.ExecContext(ctx, stmt, params...)
+		if err != nil {
+			return fmt.Errorf("Inserting row: %w", err)
+		}
+	}
+
+	err = tx.Commit()
+	if err != nil {
+		return err
+	}
+
+	commitOK = true // no need for rollback
+	return nil
 }
 
 func (ld *sqliteLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
@@ -232,8 +348,52 @@ func (ld *sqliteLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 	return nil, fmt.Errorf("unknown nav path %#v", ndata.bucketPath)
 }
 
-func (ld *sqliteLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
-	return nil, nil // No special actions are supported
+func (ld *sqliteLoadedDatabase) NavContext(ndata *navData) (ret []contextAction, err error) {
+
+	if len(ndata.bucketPath) == 0 {
+		ret = append(ret, contextAction{"Compact database", ld.CompactDatabase})
+		ret = append(ret, contextAction{"Export backup...", ld.ExportBackup})
+	}
+	if len(ndata.bucketPath) == 2 {
+		ret = append(ret, contextAction{"Drop table", ld.DropTable})
+	}
+	return
+}
+
+func (ld *sqliteLoadedDatabase) CompactDatabase(sender vcl.IComponent, ndata *navData) error {
+	_, err := ld.db.Exec(`VACUUM;`)
+	return err
+}
+
+func (ld *sqliteLoadedDatabase) ExportBackup(sender vcl.IComponent, ndata *navData) error {
+	// Popup for output file
+	dlg := vcl.NewSaveDialog(sender)
+	dlg.SetTitle("Save backup as...")
+	dlg.SetFilter(sqliteFilter)
+	ret := dlg.Execute() // Fake blocking
+	if !ret {
+		return nil // cancelled
+	}
+
+	_, err := ld.db.Exec(`VACUUM INTO ?`, dlg.FileName())
+	return err
+}
+
+func (ld *sqliteLoadedDatabase) DropTable(sender vcl.IComponent, ndata *navData) error {
+	if len(ndata.bucketPath) != 2 {
+		return errors.New("Invalid selection")
+	}
+
+	//
+
+	tableName := ndata.bucketPath[1]
+
+	if !vcl_confirm_dialog(sender, "Drop table", fmt.Sprintf("Are you sure you want to drop the table %q?", tableName)) {
+		return nil // cancelled
+	}
+
+	_, err := ld.db.Exec(`DROP TABLE "` + tableName + `"`) // WARNING can't prepare this parameter, but it comes from the DB (trusted)
+	return err
 }
 
 func (ld *sqliteLoadedDatabase) Close() {

db_sqlite_cgo.go

@@ -3,10 +3,16 @@
 package main
 
 import (
+	"yvbolt/sqliteclidriver"
+
 	sqlite3 "github.com/mattn/go-sqlite3"
 )
 
 func (ld *sqliteLoadedDatabase) DriverName() string {
+	if _, ok := ld.db.Driver().(*sqliteclidriver.SCDriver); ok {
+		return "SQLite (sqliteclidriver)"
+	}
+
 	ver1, _, _ := sqlite3.Version()
 	return "SQLite " + ver1
 }

db_sqlite_nocgo.go

@@ -3,9 +3,15 @@
 package main
 
 import (
+	"yvbolt/sqliteclidriver"
+
 	_ "modernc.org/sqlite"
 )
 
 func (ld *sqliteLoadedDatabase) DriverName() string {
+	if _, ok := ld.db.Driver().(*sqliteclidriver.SCDriver); ok {
+		return "SQLite (sqliteclidriver)"
+	}
+
 	return "SQLite (modernc.org)"
 }

debconf/debconf.go

@@ -0,0 +1,94 @@
+package debconf
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"strings"
+)
+
+const (
+	DefaultConfigDat    = `/var/cache/debconf/config.dat`
+	DefaultPasswordsDat = `/var/cache/debconf/passwords.dat`
+	DefaultTemplatesDat = `/var/cache/debconf/templates.dat`
+)
+
+type Entry struct {
+	Name       string
+	Properties [][2]string
+}
+
+type Database struct {
+	Entries        []Entry
+	AllColumnNames []string
+}
+
+func Parse(r io.Reader) (*Database, error) {
+	sc := bufio.NewScanner(r)
+
+	var entries []Entry
+	var wip Entry
+	var linenum int = 0
+
+	knownColumnNames := map[string]struct{}{
+		"Name": struct{}{},
+	}
+	var discoveredColumns []string = []string{"Name"}
+
+	for sc.Scan() {
+		linenum++
+		line := sc.Text()
+
+		if line == "" {
+			if wip.Name != "" {
+				entries = append(entries, wip)
+				wip = Entry{}
+			}
+			continue
+		}
+
+		if line[0] == ' ' {
+			// continuation of last text entry
+			if len(wip.Properties) == 0 {
+				return nil, fmt.Errorf("Continuation of nonexistent entry on line %d", linenum)
+			}
+
+			wip.Properties[len(wip.Properties)-1][1] += line[1:]
+
+		} else {
+			// New pair on current element
+			key, rest, ok := strings.Cut(line, `:`)
+			if !ok {
+				return nil, fmt.Errorf("Missing : on line %d", linenum)
+			}
+
+			if _, ok := knownColumnNames[key]; !ok {
+				knownColumnNames[key] = struct{}{}
+				discoveredColumns = append(discoveredColumns, key)
+			}
+
+			rest = strings.TrimLeft(rest, " \t")
+
+			if key == `Name` {
+				wip.Name = rest
+			} else {
+				wip.Properties = append(wip.Properties, [2]string{key, rest})
+			}
+
+		}
+
+	}
+
+	if sc.Err() != nil {
+		return nil, sc.Err()
+	}
+
+	if wip.Name != "" {
+		entries = append(entries, wip)
+	}
+
+	return &Database{
+		Entries:        entries,
+		AllColumnNames: discoveredColumns,
+	}, nil
+}

debconf/debconf_test.go

@@ -0,0 +1,30 @@
+package debconf
+
+import (
+	"os"
+	"testing"
+)
+
+func TestDebconfParse(t *testing.T) {
+	src, err := os.Open(DefaultConfigDat)
+	if err != nil {
+		if os.IsNotExist(err) {
+			t.Skip(err)
+		}
+		t.Fatal(err)
+	}
+	defer src.Close()
+
+	db, err := Parse(src)
+	if err != nil {
+		t.Fatalf("Parse: %v", err)
+	}
+
+	if len(db.Entries) == 0 {
+		t.Errorf("expected >0 entries, got %v", len(db.Entries))
+	}
+
+	if len(db.AllColumnNames) == 0 {
+		t.Errorf("expected >0 column names, got %v", len(db.AllColumnNames))
+	}
+}

go.mod

@@ -5,6 +5,7 @@ go 1.19
 require (
 	github.com/cockroachdb/pebble v1.0.0
 	github.com/dgraph-io/badger/v4 v4.2.0
+	github.com/google/uuid v1.6.0
 	github.com/mattn/go-sqlite3 v1.14.22
 	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c
 	github.com/redis/go-redis/v9 v9.5.3
@@ -32,7 +33,6 @@ require (
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
 	github.com/google/flatbuffers v1.12.1 // indirect
-	github.com/google/uuid v1.3.0 // indirect
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
 	github.com/klauspost/compress v1.16.0 // indirect
 	github.com/kr/pretty v0.3.1 // indirect

go.sum

@@ -160,8 +160,8 @@ github.com/google/pprof v0.0.0-20200430221834-fc25d7d30c6d/go.mod h1:ZgVRPoUq/hf
 github.com/google/pprof v0.0.0-20200708004538-1a94d8640e99/go.mod h1:ZgVRPoUq/hfqzAqh7sHMqb3I9Rq5C59dIz2SbBwJ4eM=
 github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26 h1:Xim43kblpZXfIBQsbuBVKCudVG457BR2GZFIz3uw3hQ=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
-github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
-github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
 github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=

images.go

@@ -10,19 +10,28 @@ import (
 var assetsFs embed.FS
 
 const (
-	imgArrowRefresh int32 = iota
+	imgAdd int32 = iota
+	imgArrowRefresh
 	imgChartBar
 	imgDatabase
 	imgDatabaseAdd
 	imgDatabaseDelete
 	imgDatabaseLightning
 	imgDatabaseSave
+	imgDelete
 	imgLightning
+	imgLightningGo
+	imgPencil
+	imgPencilAdd
+	imgPencilDelete
+	imgPencilGo
+	imgResultsetNext
 	imgTable
 	imgTableAdd
 	imgTableDelete
 	imgTableSave
 	imgVendorCockroach
+	imgVendorDebian
 	imgVendorDgraph
 	imgVendorGithub
 	imgVendorMySQL
@@ -47,6 +56,9 @@ func loadImages(owner vcl.IComponent) *vcl.TImageList {
 	}
 
 	ilist := vcl.NewImageList(owner)
+
+	// ls assets | sort | sed -re 's~(.+)~ilist.Add(mustLoad("assets/\1"), nil)~'
+	ilist.Add(mustLoad("assets/add.png"), nil)
 	ilist.Add(mustLoad("assets/arrow_refresh.png"), nil)
 	ilist.Add(mustLoad("assets/chart_bar.png"), nil)
 	ilist.Add(mustLoad("assets/database.png"), nil)
@@ -54,17 +66,26 @@ func loadImages(owner vcl.IComponent) *vcl.TImageList {
 	ilist.Add(mustLoad("assets/database_delete.png"), nil)
 	ilist.Add(mustLoad("assets/database_lightning.png"), nil)
 	ilist.Add(mustLoad("assets/database_save.png"), nil)
+	ilist.Add(mustLoad("assets/delete.png"), nil)
 	ilist.Add(mustLoad("assets/lightning.png"), nil)
+	ilist.Add(mustLoad("assets/lightning_go.png"), nil)
+	ilist.Add(mustLoad("assets/pencil.png"), nil)
+	ilist.Add(mustLoad("assets/pencil_add.png"), nil)
+	ilist.Add(mustLoad("assets/pencil_delete.png"), nil)
+	ilist.Add(mustLoad("assets/pencil_go.png"), nil)
+	ilist.Add(mustLoad("assets/resultset_next.png"), nil)
 	ilist.Add(mustLoad("assets/table.png"), nil)
 	ilist.Add(mustLoad("assets/table_add.png"), nil)
 	ilist.Add(mustLoad("assets/table_delete.png"), nil)
 	ilist.Add(mustLoad("assets/table_save.png"), nil)
 	ilist.Add(mustLoad("assets/vendor_cockroach.png"), nil)
+	ilist.Add(mustLoad("assets/vendor_debian.png"), nil)
 	ilist.Add(mustLoad("assets/vendor_dgraph.png"), nil)
 	ilist.Add(mustLoad("assets/vendor_github.png"), nil)
 	ilist.Add(mustLoad("assets/vendor_mysql.png"), nil)
 	ilist.Add(mustLoad("assets/vendor_redis.png"), nil)
 	ilist.Add(mustLoad("assets/vendor_sqlite.png"), nil)
+
 	return ilist
 
 }

lexer/lexer.go

@@ -65,6 +65,15 @@ func Fields(input string) ([]string, error) {
 			} else if c == '\\' {
 				return nil, fmt.Errorf(`Unexpected \ at char %d`, pos)
 
+			} else if c == '(' || c == ')' || c == '?' || c == ',' || c == '+' || c == '*' || c == '-' || c == '/' || c == '%' || c == ';' || c == '=' {
+				// Tokenize separately, even if they appear touching another top-level token
+				// Should still be safe to re-join
+				if len(wip) != 0 {
+					ret = append(ret, wip)
+					wip = ""
+				}
+				ret = append(ret, string(c))
+
 			} else {
 				wip += string(c)
 			}

lexer/lexer_test.go

@@ -59,6 +59,24 @@ func TestLexer(t *testing.T) {
 			expectErr: false,
 		},
 
+		// Special characters lexed as separate tokens, but only at top level
+
+		testCase{
+			input:     `3+5*(2.3/6);`,
+			expect:    []string{"3", `+`, "5", "*", "(", "2.3", "/", "6", ")", ";"},
+			expectErr: false,
+		},
+		testCase{
+			input:     `SELECT "3+5*(2.3/6)" AS expression;`,
+			expect:    []string{"SELECT", `"3+5*(2.3/6)"`, "AS", "expression", ";"},
+			expectErr: false,
+		},
+		testCase{
+			input:     `INSERT INTO foo (bar, baz) VALUES (?, ?);`,
+			expect:    []string{"INSERT", "INTO", "foo", "(", "bar", ",", "baz", ")", "VALUES", "(", "?", ",", "?", ")", ";"},
+			expectErr: false,
+		},
+
 		// Errors
 
 		testCase{
@@ -99,7 +117,7 @@ func TestLexer(t *testing.T) {
 			}
 
 			if !reflect.DeepEqual(out, tc.expect) {
-				t.Errorf("Test %q got %v, expected %v", tc.input, out, tc.expect)
+				t.Errorf("Test %q\n- got:     %#v\n- expected %#v", tc.input, out, tc.expect)
 			}
 		}
 

loadedDatabase.go

@@ -10,7 +10,7 @@ var ErrNavNotExist error = errors.New("The selected item no longer exists")
 
 type contextAction struct {
 	Name     string
-	Callback func(ndata *navData)
+	Callback func(sender vcl.IComponent, ndata *navData) error
 }
 
 // loadedDatabase is a DB-agnostic interface for each loaded database.
@@ -18,14 +18,21 @@ type loadedDatabase interface {
 	DisplayName() string
 	DriverName() string
 	RootElement() *vcl.TTreeNode
-	RenderForNav(f *TMainForm, ndata *navData)
-	ExecQuery(query string, resultArea *vcl.TListView)
+	RenderForNav(f *TMainForm, ndata *navData) error
 	NavChildren(ndata *navData) ([]string, error)
 	NavContext(ndata *navData) ([]contextAction, error)
 	Keepalive(ndata *navData)
 	Close()
 }
 
+type queryableLoadedDatabase interface {
+	ExecQuery(query string, resultArea *vcl.TStringGrid) error
+}
+
+type editableLoadedDatabase interface {
+	ApplyChanges(f *TMainForm, ndata *navData) error
+}
+
 // navData is the .Data() pointer for each TTreeNode in the left-hand tree.
 type navData struct {
 	ld             loadedDatabase

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"errors"
 	"fmt"
+	"runtime"
 	"runtime/debug"
 	"strings"
 	"unsafe"
@@ -16,6 +17,11 @@ import (
 const (
 	APPNAME      = "yvbolt"
 	HOMEPAGE_URL = "https://code.ivysaur.me/yvbolt"
+
+	CO_INSERT        = colors.ClYellow
+	CO_EDIT_IMPLICIT = colors.ClLightgreen
+	CO_EDIT_EXPLICIT = colors.ClGreen
+	CO_DELETE        = colors.ClRed
 )
 
 type TMainForm struct {
@@ -30,9 +36,17 @@ type TMainForm struct {
 	Buckets       *vcl.TTreeView
 	Tabs          *vcl.TPageControl
 	propertiesBox *vcl.TMemo
-	contentBox    *vcl.TListView
-	queryInput    *vcl.TMemo
-	queryResult   *vcl.TListView
+	contentBox    *vcl.TStringGrid
+	dataInsertBtn *vcl.TToolButton
+	dataDelRowBtn *vcl.TToolButton
+	dataCommitBtn *vcl.TToolButton
+	isEditing     bool
+	insertRows    map[int32]struct{} // Rows in the StringGrid that are to-be-inserted
+	deleteRows    map[int32]struct{}
+	updateRows    map[int32][]int32 // Row->cells that are to-be-updated
+	queryExecBtn  *vcl.TToolButton
+	queryInput    *vcl.TRichEdit
+	queryResult   *vcl.TStringGrid
 
 	none *noLoadedDatabase
 	dbs  []loadedDatabase
@@ -51,6 +65,8 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 
 	f.SetCaption(APPNAME)
 	f.ScreenCenter()
+	f.SetWidth(1280)
+	f.SetHeight(640)
 	f.ImageList.GetIcon(imgDatabaseLightning, f.Icon())
 
 	mnuFile := vcl.NewMenuItem(f)
@@ -79,6 +95,15 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 
 	//
 
+	mnuFileDebconf := vcl.NewMenuItem(mnuFile)
+	mnuFileDebconf.SetCaption("Debconf")
+	mnuFileDebconf.SetImageIndex(imgVendorDebian)
+	mnuFile.Add(mnuFileDebconf)
+
+	vcl_menuitem(mnuFileDebconf, "Open database...", imgDatabaseAdd, f.OnMnuFileDebianOpenClick)
+
+	//
+
 	mnuFilePebble := vcl.NewMenuItem(mnuFile)
 	mnuFilePebble.SetCaption("Pebble")
 	mnuFilePebble.SetImageIndex(imgVendorCockroach)
@@ -126,7 +151,7 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	mnuQueryExecute.SetCaption("Execute")
 	mnuQueryExecute.SetShortCutFromString("F5")
 	mnuQueryExecute.SetOnClick(f.OnQueryExecute)
-	mnuQueryExecute.SetImageIndex(imgLightning)
+	mnuQueryExecute.SetImageIndex(imgResultsetNext)
 	mnuQuery.Add(mnuQueryExecute)
 
 	mnuHelp := vcl.NewMenuItem(f)
@@ -187,8 +212,8 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	f.propertiesBox.BorderSpacing().SetAround(MY_SPACING)
 	f.propertiesBox.SetAlign(types.AlClient) // fill remaining space
 	f.propertiesBox.SetReadOnly(true)
-	f.propertiesBox.SetEnabled(true)        // Need to leave it enabled so scrolling works
-	f.propertiesBox.SetColor(colors.ClForm) // 0x00f0f0f0
+	f.propertiesBox.SetEnabled(true) // Need to leave it enabled so scrolling works
+	f.propertiesBox.SetColor(vcl_default_tab_background())
 
 	f.propertiesBox.SetBorderStyle(types.BsNone)
 	f.propertiesBox.SetScrollBars(types.SsAutoVertical)
@@ -198,14 +223,56 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	dataTab.SetCaption("Data")
 	dataTab.SetImageIndex(imgTable)
 
-	f.contentBox = vcl.NewListView(dataTab)
+	dataButtonBar := vcl.NewToolBar(dataTab)
+	dataButtonBar.SetParent(dataTab)
+	dataButtonBar.SetAlign(types.AlTop)
+	dataButtonBar.BorderSpacing().SetLeft(MY_SPACING)
+	dataButtonBar.BorderSpacing().SetTop(MY_SPACING)
+	dataButtonBar.BorderSpacing().SetBottom(1)
+	dataButtonBar.BorderSpacing().SetRight(MY_SPACING)
+	dataButtonBar.SetEdgeBorders(0)
+	dataButtonBar.SetImages(f.ImageList)
+
+	dataRefreshBtn := vcl.NewToolButton(dataButtonBar)
+	dataRefreshBtn.SetParent(dataButtonBar)
+	dataRefreshBtn.SetHint("Refresh")
+	dataRefreshBtn.SetShowHint(true)
+	dataRefreshBtn.SetImageIndex(imgArrowRefresh)
+	dataRefreshBtn.SetOnClick(func(sender vcl.IObject) { f.RefreshCurrentItem() })
+
+	f.dataInsertBtn = vcl.NewToolButton(dataButtonBar)
+	f.dataInsertBtn.SetParent(dataButtonBar)
+	f.dataInsertBtn.SetImageIndex(imgAdd)
+	f.dataInsertBtn.SetHint("Insert")
+	f.dataInsertBtn.SetShowHint(true)
+	f.dataInsertBtn.SetOnClick(f.OnDataInsertClick)
+
+	f.dataDelRowBtn = vcl.NewToolButton(dataButtonBar)
+	f.dataDelRowBtn.SetParent(dataButtonBar)
+	f.dataDelRowBtn.SetImageIndex(imgDelete)
+	f.dataDelRowBtn.SetHint("Delete Row")
+	f.dataDelRowBtn.SetShowHint(true)
+	f.dataDelRowBtn.SetOnClick(f.OnDataDeleteRowClick)
+
+	f.dataCommitBtn = vcl.NewToolButton(dataButtonBar)
+	f.dataCommitBtn.SetParent(dataButtonBar)
+	f.dataCommitBtn.SetImageIndex(imgPencilGo)
+	f.dataCommitBtn.SetHint("Commit")
+	f.dataCommitBtn.SetShowHint(true)
+	f.dataCommitBtn.SetOnClick(f.OnDataCommitClick)
+
+	f.contentBox = vcl.NewStringGrid(dataTab)
 	f.contentBox.SetParent(dataTab)
-	f.contentBox.BorderSpacing().SetAround(MY_SPACING)
-	f.contentBox.SetAlign(types.AlClient)     // fill remaining space
-	f.contentBox.SetViewStyle(types.VsReport) // "Report style" i.e. has columns
-	f.contentBox.SetAutoWidthLastColumn(true)
-	f.contentBox.SetReadOnly(true)
-	f.contentBox.Columns().Clear()
+	f.contentBox.BorderSpacing().SetLeft(MY_SPACING)
+	f.contentBox.BorderSpacing().SetRight(MY_SPACING)
+	f.contentBox.BorderSpacing().SetBottom(MY_SPACING)
+	f.contentBox.SetAlign(types.AlClient) // fill remaining space
+	f.contentBox.SetOptions(f.contentBox.Options().Include(types.GoThumbTracking, types.GoColSizing, types.GoDblClickAutoSize, types.GoEditing))
+	f.contentBox.SetOnPrepareCanvas(f.OnDataPrepareCanvas)
+	f.contentBox.SetOnEditingDone(f.OnDataCellEdited)
+	f.contentBox.SetOnGetEditText(f.OnDataCellEditStarting)
+	f.contentBox.SetDefaultColWidth(MY_WIDTH)
+	vcl_stringgrid_clear(f.contentBox)
 
 	queryTab := vcl.NewTabSheet(f.Tabs)
 	queryTab.SetParent(f.Tabs)
@@ -217,42 +284,50 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	queryButtonBar.SetAlign(types.AlTop)
 	queryButtonBar.BorderSpacing().SetLeft(MY_SPACING)
 	queryButtonBar.BorderSpacing().SetTop(MY_SPACING)
-	queryButtonBar.BorderSpacing().SetBottom(0)
+	//queryButtonBar.BorderSpacing().SetBottom(1)
 	queryButtonBar.BorderSpacing().SetRight(MY_SPACING)
+	queryButtonBar.SetEdgeBorders(0)
 	queryButtonBar.SetImages(f.ImageList)
 	queryButtonBar.SetShowCaptions(true)
 
-	queryExecBtn := vcl.NewToolButton(queryButtonBar)
-	queryExecBtn.SetParent(queryButtonBar)
-	queryExecBtn.SetCaption("Execute")
-	// queryExecBtn.SetImageIndex(imgLightning)
-	queryExecBtn.SetOnClick(f.OnQueryExecute)
+	f.queryExecBtn = vcl.NewToolButton(queryButtonBar)
+	f.queryExecBtn.SetParent(queryButtonBar)
+	f.queryExecBtn.SetHint("Execute")
+	f.queryExecBtn.SetShowHint(true)
+	f.queryExecBtn.SetImageIndex(imgResultsetNext)
+	f.queryExecBtn.SetOnClick(f.OnQueryExecute)
 
-	f.queryInput = vcl.NewMemo(queryTab)
+	f.queryInput = vcl.NewRichEdit(queryTab)
 	f.queryInput.SetParent(queryTab)
 	f.queryInput.SetHeight(MY_HEIGHT)
 	f.queryInput.SetAlign(types.AlTop)
 	f.queryInput.SetTop(1)
-	f.queryInput.Font().SetName("monospace")
+	if runtime.GOOS == "windows" {
+		f.queryInput.Font().SetName("Consolas")
+	} else {
+		f.queryInput.Font().SetName("monospace")
+	}
+	f.queryInput.SetCursor(types.CrIBeam) // Use text cursor instead of default pointer cursor
 	f.queryInput.BorderSpacing().SetLeft(MY_SPACING)
-	f.queryInput.BorderSpacing().SetTop(0)
+	//f.queryInput.BorderSpacing().SetTop(1)
 	f.queryInput.BorderSpacing().SetRight(MY_SPACING)
+	f.queryInput.SetBorderStyle(types.BsFrame)
+	// f.queryInput.SetOnKeyUp(f.OnQueryTextChanged) // Performs extremely slowly
 
 	vsplit := vcl.NewSplitter(queryTab)
 	vsplit.SetParent(queryTab)
 	vsplit.SetAlign(types.AlTop)
 	vsplit.SetTop(2)
 
-	f.queryResult = vcl.NewListView(queryTab)
+	f.queryResult = vcl.NewStringGrid(queryTab)
 	f.queryResult.SetParent(queryTab)
-	f.queryResult.SetAlign(types.AlClient)     // fill remaining space
-	f.queryResult.SetViewStyle(types.VsReport) // "Report style" i.e. has columns
-	f.queryResult.SetAutoWidthLastColumn(true)
-	f.queryResult.SetReadOnly(true)
-	f.queryResult.Columns().Clear()
+	f.queryResult.SetAlign(types.AlClient) // fill remaining space
 	f.queryResult.BorderSpacing().SetLeft(MY_SPACING)
 	f.queryResult.BorderSpacing().SetRight(MY_SPACING)
 	f.queryResult.BorderSpacing().SetBottom(MY_SPACING)
+	f.queryResult.SetOptions(f.queryResult.Options().Include(types.GoThumbTracking))
+	f.queryResult.SetDefaultColWidth(MY_WIDTH)
+	vcl_stringgrid_clear(f.queryResult)
 
 	f.none = &noLoadedDatabase{}
 	f.OnNavChange(f, nil) // calls f.none.RenderForNav and sets up status bar content
@@ -261,7 +336,7 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 func (f *TMainForm) OnMnuFileBoltNewClick(sender vcl.IObject) {
 	dlg := vcl.NewSaveDialog(f)
 	dlg.SetTitle("Save database as...")
-	dlg.SetFilter("Bolt database|*.db|All files|*.*")
+	dlg.SetFilter(boltFilter)
 	ret := dlg.Execute() // Fake blocking
 	if ret {
 		f.boltAddDatabaseFromFile(dlg.FileName(), false)
@@ -271,7 +346,7 @@ func (f *TMainForm) OnMnuFileBoltNewClick(sender vcl.IObject) {
 func (f *TMainForm) OnMnuFileBoltOpenClick(sender vcl.IObject) {
 	dlg := vcl.NewOpenDialog(f)
 	dlg.SetTitle("Select a database file...")
-	dlg.SetFilter("Bolt database|*.db|All files|*.*")
+	dlg.SetFilter(boltFilter)
 	ret := dlg.Execute() // Fake blocking
 	if ret {
 		f.boltAddDatabaseFromFile(dlg.FileName(), false)
@@ -281,7 +356,7 @@ func (f *TMainForm) OnMnuFileBoltOpenClick(sender vcl.IObject) {
 func (f *TMainForm) OnMnuFileBoltOpenReadonlyClick(sender vcl.IObject) {
 	dlg := vcl.NewOpenDialog(f)
 	dlg.SetTitle("Select a database file...")
-	dlg.SetFilter("Bolt database|*.db|All files|*.*")
+	dlg.SetFilter(boltFilter)
 	ret := dlg.Execute() // Fake blocking
 	if ret {
 		f.boltAddDatabaseFromFile(dlg.FileName(), true)
@@ -293,7 +368,7 @@ func (f *TMainForm) OnMnuFileSqliteOpenClick(sender vcl.IObject) {
 
 	dlg := vcl.NewOpenDialog(f)
 	dlg.SetTitle("Select a database file...")
-	dlg.SetFilter("SQLite database|*.db;*.db3;*.sqlite;*.sqlite3|All files|*.*")
+	dlg.SetFilter(sqliteFilter)
 	ret := dlg.Execute() // Fake blocking
 	if ret {
 		f.sqliteAddDatabaseFromFile(dlg.FileName(), cliDriver)
@@ -322,6 +397,19 @@ func (f *TMainForm) OnMnuFilePebbleOpenClick(sender vcl.IObject) {
 	}
 }
 
+func (f *TMainForm) OnMnuFileDebianOpenClick(sender vcl.IObject) {
+	dlg := vcl.NewOpenDialog(f)
+	dlg.SetTitle("Select a database file...")
+	dlg.SetFilter("Debconf database|*.dat|All files|*.*")
+	if runtime.GOOS == "linux" {
+		dlg.SetInitialDir(`/var/cache/debconf/`)
+	}
+	ret := dlg.Execute() // Fake blocking
+	if ret {
+		f.debconfAddDatabaseFrom(dlg.FileName())
+	}
+}
+
 func (f *TMainForm) OnMnuFilePebbleMemoryClick(sender vcl.IObject) {
 	f.pebbleAddDatabaseFromMemory()
 }
@@ -368,7 +456,7 @@ func (f *TMainForm) OnMenuHelpVersion(sender vcl.IObject) {
 		return
 	}
 
-	info := "This version of " + APPNAME + " was compiled with:\n"
+	info := "This version of " + APPNAME + " was compiled with:\n\n"
 	for _, dep := range bi.Deps {
 
 		// Filter to only interesting things
@@ -423,7 +511,10 @@ func (f *TMainForm) OnNavContextPopup(sender vcl.IObject, mousePos types.TPoint,
 			mnuAction.SetCaption(action.Name)
 			cb := action.Callback // Copy to avoid reuse of loop variable
 			mnuAction.SetOnClick(func(sender vcl.IObject) {
-				cb(ndata)
+				err = cb(f, ndata)
+				if err != nil {
+					vcl.ShowMessage(err.Error())
+				}
 				f.OnNavContextRefresh(curItem, ndata)
 			})
 			mnu.Items().Add(mnuAction)
@@ -447,6 +538,18 @@ func (f *TMainForm) OnNavContextPopup(sender vcl.IObject, mousePos types.TPoint,
 	mnu.Popup2()
 }
 
+func (f *TMainForm) RefreshCurrentItem() {
+	item := f.Buckets.Selected()
+	if item == nil {
+		return // nothing to do
+	}
+
+	ndata := (*navData)(item.Data())
+
+	f.OnNavContextRefresh(item, ndata) // Refresh LHS pane/children
+	f.OnNavChange(f.Buckets, item)     // Refresh RHS pane/data content
+}
+
 func (f *TMainForm) OnNavContextRefresh(item *vcl.TTreeNode, ndata *navData) {
 	isExpanded := item.Expanded()
 
@@ -463,6 +566,131 @@ func (f *TMainForm) OnNavContextRefresh(item *vcl.TTreeNode, ndata *navData) {
 	item.SetExpanded(isExpanded)
 }
 
+func (f *TMainForm) OnDataPrepareCanvas(sender vcl.IObject, aCol, aRow int32, aState types.TGridDrawState) {
+
+	if _, ok := f.deleteRows[aRow]; ok {
+		f.contentBox.Canvas().Brush().SetColor(CO_DELETE)
+		return
+	}
+
+	if _, ok := f.insertRows[aRow]; ok {
+		f.contentBox.Canvas().Brush().SetColor(CO_INSERT)
+		return
+	}
+
+	if er, ok := f.updateRows[aRow]; ok {
+		// This row is being edited
+		if int32slice_contains(er, aCol) {
+			f.contentBox.Canvas().Brush().SetColor(CO_EDIT_EXPLICIT)
+		} else {
+			f.contentBox.Canvas().Brush().SetColor(CO_EDIT_IMPLICIT)
+		}
+		return
+	}
+}
+
+// func (f *TMainForm) OnDataCellEditStarting(sender vcl.IObject, aCol, aRow int32, editor **vcl.TWinControl) {
+func (f *TMainForm) OnDataCellEditStarting(sender vcl.IObject, aCol, aRow int32, value *string) {
+	f.isEditing = true
+}
+
+func (f *TMainForm) OnDataCellEdited(sender vcl.IObject) {
+	// The OnEditingDone event fires whenever the TStringGrid loses focus, even
+	// if editing was not currently taking place
+	// To detect real edits, set a flag in the OnSelectEditor event
+	if !f.isEditing {
+		return
+	}
+	f.isEditing = false
+
+	aRow := f.contentBox.Row()
+	aCol := f.contentBox.Col()
+
+	// If this is an insert row, no need to patch updateRows
+	if _, ok := f.insertRows[aRow]; ok {
+		return // nothing to do
+	}
+
+	if chk, ok := f.updateRows[aRow]; ok {
+		if int32slice_contains(chk, aCol) {
+			// nothing to do
+		} else {
+			chk = append(chk, aCol)
+			f.updateRows[aRow] = chk
+		}
+	} else {
+		f.updateRows[aRow] = []int32{aCol}
+	}
+
+	// If this row was marked for deletion, this new event takes priority
+	delete(f.deleteRows, aRow)
+
+	// Signal repaint
+	f.contentBox.InvalidateRow(aRow)
+}
+
+func (f *TMainForm) OnDataInsertClick(sender vcl.IObject) {
+	if !f.contentBox.Enabled() {
+		return // Not an active data view
+	}
+
+	rpos := f.contentBox.RowCount()
+	f.contentBox.SetRowCount(rpos + 1)
+
+	f.insertRows[rpos] = struct{}{}
+
+	// Scroll to bottom
+	f.contentBox.SetTopRow(rpos)
+}
+
+func (f *TMainForm) OnDataDeleteRowClick(sender vcl.IObject) {
+	if !f.contentBox.Enabled() {
+		return // Not an active data view
+	}
+
+	rpos := f.contentBox.Row()
+	f.deleteRows[rpos] = struct{}{}
+
+	// If this row was marked for edit, this takes priority
+	delete(f.updateRows, rpos)
+
+	// Repaint
+	f.contentBox.InvalidateRow(rpos)
+}
+
+func (f *TMainForm) OnDataCommitClick(sender vcl.IObject) {
+	if !f.contentBox.Enabled() {
+		return // Not an active data view
+	}
+
+	node := f.Buckets.Selected()
+	if node == nil {
+		vcl.ShowMessage("No database selected")
+		return
+	}
+
+	scrollPos := f.contentBox.TopRow()
+
+	ndata := (*navData)(node.Data())
+
+	editableLd, ok := ndata.ld.(editableLoadedDatabase)
+	if !ok {
+		vcl.ShowMessage("Unsupported action for this database")
+		return
+	}
+
+	err := editableLd.ApplyChanges(f, ndata)
+	if err != nil {
+		vcl.ShowMessage(err.Error())
+	}
+
+	// Refresh content
+	f.OnNavChange(f.Buckets, node) // Refresh RHS pane/data content
+
+	// Preserve scroll position
+	f.contentBox.SetTopRow(scrollPos)
+}
+
 func (f *TMainForm) OnNavContextClose(sender vcl.IObject) {
 	curItem := f.Buckets.Selected()
 	if curItem == nil {
@@ -480,6 +708,46 @@ func (f *TMainForm) OnNavContextClose(sender vcl.IObject) {
 	// n.b. This triggers OnNavChange, which will then re-render from noLoadedDatabase{}
 }
 
+// func (f *TMainForm) OnQueryTextChanged(sender vcl.IObject) {
+func (f *TMainForm) OnQueryTextChanged(sender vcl.IObject, key *types.Char, shift types.TShiftState) {
+
+	// FIXME changing the text colour calls the onchange handler recursively
+	// FIXME changing the text colour pushes into the undo stack
+
+	// Preserve
+	f.queryInput.Lines().BeginUpdate()
+	origPos := f.queryInput.SelStart()
+	origLen := f.queryInput.SelLength()
+	defer func() {
+		f.queryInput.SetSelStart(origPos)
+		f.queryInput.SetSelLength(origLen)
+		f.queryInput.Lines().EndUpdate()
+	}()
+
+	tx := strings.ToLower(f.queryInput.Text())
+
+	// Reset all existing colors
+	f.queryInput.SetSelStart(0)
+	f.queryInput.SetSelLength(int32(len(tx)))
+	f.queryInput.SelAttributes().SetColor(colors.ClBlack)
+
+	searchPos := 0
+	for {
+		matchPos := strings.Index(tx[searchPos:], "select")
+		if matchPos == -1 {
+			break
+		}
+
+		matchPos += searchPos // compensate for slicing
+
+		f.queryInput.SetSelStart(int32(matchPos))
+		f.queryInput.SetSelLength(6)
+		f.queryInput.SelAttributes().SetColor(colors.ClRed)
+
+		searchPos = matchPos + 6 // strlen(SELECT)
+	}
+}
+
 func (f *TMainForm) OnQueryExecute(sender vcl.IObject) {
 	// If query tab is not selected, switch to it, but do not exec
 	if f.Tabs.ActivePageIndex() != 2 {
@@ -492,6 +760,10 @@ func (f *TMainForm) OnQueryExecute(sender vcl.IObject) {
 		queryString = f.queryInput.SelText() // Just the selected text
 	}
 
+	if strings.TrimSpace(queryString) == "" {
+		return // prevent blank query
+	}
+
 	// Execute
 	node := f.Buckets.Selected()
 	if node == nil {
@@ -500,7 +772,18 @@ func (f *TMainForm) OnQueryExecute(sender vcl.IObject) {
 	}
 
 	ndata := (*navData)(node.Data())
-	ndata.ld.ExecQuery(queryString, f.queryResult)
+
+	queryableLd, ok := ndata.ld.(queryableLoadedDatabase)
+	if !ok {
+		vcl.ShowMessage("Unsupported action for this database")
+		return
+	}
+
+	err := queryableLd.ExecQuery(queryString, f.queryResult)
+	if err != nil {
+		vcl.ShowMessage(err.Error())
+		return
+	}
 }
 
 func (f *TMainForm) OnNavChange(sender vcl.IObject, node *vcl.TTreeNode) {
@@ -513,7 +796,33 @@ func (f *TMainForm) OnNavChange(sender vcl.IObject, node *vcl.TTreeNode) {
 		ld = ndata.ld
 	}
 
-	ld.RenderForNav(f, ndata) // Handover to the database type's own renderer function
+	// Reset some controls that the render function is expected to populate
+	f.insertRows = make(map[int32]struct{})
+	f.updateRows = make(map[int32][]int32)
+	f.deleteRows = make(map[int32]struct{})
+	f.isEditing = false
+	f.propertiesBox.Clear()
+	vcl_stringgrid_clear(f.contentBox)
+
+	err := ld.RenderForNav(f, ndata) // Handover to the database type's own renderer function
+	if err != nil {
+		vcl.ShowMessage(err.Error())
+
+		// Ensure elements are disabled
+		f.contentBox.SetEnabled(false)
+	}
+
+	// Toggle the Edit functionality
+	_, ok := ld.(editableLoadedDatabase)
+	f.dataCommitBtn.SetEnabled(ok)
+	f.dataDelRowBtn.SetEnabled(ok)
+	f.dataInsertBtn.SetEnabled(ok)
+
+	// Toggle the Query functionality
+	_, ok = ld.(queryableLoadedDatabase)
+	f.queryInput.SetEnabled(ok)
+	f.queryResult.SetEnabled(ok)
+	f.queryExecBtn.SetEnabled(ok)
 
 	// We're in charge of common status bar text updates
 	f.StatusBar.SetSimpleText(ld.DisplayName() + " | " + ld.DriverName())

redisConnectionDialog.go

@@ -26,9 +26,9 @@ type TRedisConnectionDialog struct {
 func (f *TRedisConnectionDialog) OnFormCreate(sender vcl.IObject) {
 
 	f.SetCaption("Connect to Redis...")
-	f.ScreenCenter()
 	f.SetWidth(320)
 	f.SetHeight(160)
+	f.SetPosition(types.PoOwnerFormCenter)
 
 	// row 1
 

sqliteclidriver/eventcmd.go

@@ -0,0 +1,115 @@
+package sqliteclidriver
+
+import (
+	"io"
+	"os/exec"
+	"sync"
+)
+
+const (
+	evtypeStdout int = iota
+	evtypeStderr
+	evtypeExit
+)
+
+type processEvent struct {
+	evtype int
+	data   []byte
+	err    error
+}
+
+func (pe processEvent) Error() string {
+	if pe.err != nil {
+		return pe.err.Error()
+	}
+
+	if pe.evtype == evtypeStderr {
+		return string(pe.data)
+	}
+
+	return "<no error>"
+}
+
+func (pe processEvent) Unwrap() error {
+	return pe.err
+}
+
+//
+
+func ExecEvents(cmd *exec.Cmd) (<-chan processEvent, io.WriteCloser, error) {
+
+	pw, err := cmd.StdinPipe()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	pr, err := cmd.StdoutPipe()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	pe, err := cmd.StderrPipe()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	err = cmd.Start()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	chEvents := make(chan processEvent, 0)
+
+	var wg sync.WaitGroup
+
+	go func() {
+		defer wg.Done()
+		processEventWorker(pr, evtypeStdout, chEvents)
+	}()
+
+	go func() {
+		defer wg.Done()
+		processEventWorker(pe, evtypeStderr, chEvents)
+	}()
+	wg.Add(2)
+
+	go func() {
+		// Only call cmd.Wait() after pipes are closed
+		wg.Wait()
+
+		err = cmd.Wait()
+		chEvents <- processEvent{
+			evtype: evtypeExit,
+			err:    err,
+		}
+
+		close(chEvents)
+	}()
+
+	return chEvents, pw, nil
+}
+
+func processEventWorker(p io.Reader, evtype int, dest chan<- processEvent) {
+	for {
+		buf := make([]byte, 1024)
+		n, err := p.Read(buf)
+
+		if n > 0 {
+			dest <- processEvent{
+				evtype: evtype,
+				data:   buf[0:n],
+			}
+		}
+
+		if err != nil {
+			dest <- processEvent{
+				evtype: evtype,
+				err:    err,
+			}
+
+			// Assume all errors are permanent
+			// Ordering can produce either io.EOF, ErrClosedPipe, or PathError{"file already closed"}
+			return
+		}
+	}
+}

sqliteclidriver/eventcmd_test.go

@@ -0,0 +1,69 @@
+package sqliteclidriver
+
+import (
+	"errors"
+	"io"
+	"os/exec"
+	"sync"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestEventCmd(t *testing.T) {
+	cmd := exec.Command("/bin/bash", "-c", `echo "hello world"`)
+
+	ch, _, err := ExecEvents(cmd)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var consume []processEvent
+	for ev := range ch {
+		consume = append(consume, ev)
+	}
+
+	expect := []processEvent{
+		processEvent{evtype: evtypeStdout, data: []byte("hello world\n")},
+		processEvent{evtype: evtypeStdout, err: io.EOF},
+		processEvent{evtype: evtypeStderr, err: io.EOF},
+		processEvent{evtype: evtypeExit, err: nil},
+	}
+
+	require.EqualValues(t, expect, consume)
+}
+
+func TestEventCmdStdin(t *testing.T) {
+	cmd := exec.Command("/usr/bin/tr", "a-z", "A-Z")
+
+	ch, pw, err := ExecEvents(cmd)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	wg := sync.WaitGroup{}
+	wg.Add(1)
+	var consume []processEvent
+	go func() {
+		defer wg.Done()
+
+		for ev := range ch {
+			if ev.err != nil && errors.Is(ev.err, io.EOF) {
+				continue // skip flakey ordering of two EOF statements
+			}
+			consume = append(consume, ev)
+		}
+	}()
+
+	pw.Write([]byte("hello world"))
+	pw.Close()
+
+	wg.Wait()
+
+	expect := []processEvent{
+		processEvent{evtype: evtypeStdout, data: []byte("HELLO WORLD")},
+		processEvent{evtype: evtypeExit, err: nil},
+	}
+
+	require.EqualValues(t, expect, consume)
+}

sqliteclidriver/orderedkv.go

@@ -0,0 +1,85 @@
+package sqliteclidriver
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+)
+
+type Pair struct {
+	Key   string
+	Value any
+}
+
+type OrderedKV []Pair
+
+func (o *OrderedKV) UnmarshalJSON(data []byte) error {
+	// Rough estimate malloc size based on number of `:`
+	// This is a lower bound since there might be nested elements
+	var elCount int64
+	for _, c := range data {
+		if c == ':' {
+			elCount += 1
+		}
+	}
+
+	*o = make([]Pair, 0, elCount)
+
+	// Parse the initial opening { delimiter from the JSON stream
+
+	reader := bytes.NewReader(data)
+	dec := json.NewDecoder(reader)
+
+	tok, err := dec.Token()
+	if err != nil {
+		return fmt.Errorf("expected '{': %w", err)
+	}
+	if d, ok := tok.(json.Delim); !ok || (rune(d) != '{') {
+		return fmt.Errorf("expected '{', got %v", tok)
+	}
+
+	// Read remaining content
+
+	for dec.More() {
+
+		var p Pair
+
+		// Parse key: either string or Delim('}')
+		tok, err := dec.Token()
+		if err != nil {
+			return fmt.Errorf("expected '{': %w", err)
+		}
+		switch tok := tok.(type) {
+		case json.Delim:
+			if rune(tok) == '}' {
+				// Finished
+				break
+			}
+			// Something else
+			return fmt.Errorf("expected string or }, got %v", tok)
+
+		case string:
+			// Valid key
+			p.Key = tok
+
+		default:
+			return fmt.Errorf("expected string or }, got %v", tok)
+		}
+
+		// Parse value (any)
+		err = dec.Decode(&p.Value)
+		if err != nil {
+			return err
+		}
+
+		*o = append(*o, p)
+	}
+
+	// Assert that there is no remaining content
+	if reader.Len() != 0 {
+		return fmt.Errorf("Unexpected trailing data (%d bytes remaining)", reader.Len())
+	}
+
+	// Done
+	return nil
+}

sqliteclidriver/orderedkv_test.go

@@ -0,0 +1,30 @@
+package sqliteclidriver
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestOrderedKV(t *testing.T) {
+
+	input := `
+{
+	"zzz": "foo",
+	"aaa": "bar"
+}
+`
+	var got OrderedKV
+	err := json.Unmarshal([]byte(input), &got)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expect := OrderedKV{
+		Pair{Key: "zzz", Value: "foo"},
+		Pair{Key: "aaa", Value: "bar"},
+	}
+
+	require.EqualValues(t, expect, got)
+}

sqliteclidriver/sqliteclidriver.go

@@ -5,7 +5,6 @@
 // Functionality is limited.
 //
 // Known caveats:
-// - Lexer only understands ? if it's separated by spaces
 // - Bad error handling
 // - Few supported types
 // - Has to escape parameters for CLI instead of preparing them, so not safe for untrusted usage
@@ -23,7 +22,10 @@ import (
 	"fmt"
 	"io"
 	"os/exec"
+
 	"yvbolt/lexer"
+
+	"github.com/google/uuid"
 )
 
 var ErrNotSupported = errors.New("Not supported")
@@ -37,29 +39,13 @@ func (d *SCDriver) Open(connectionString string) (driver.Conn, error) {
 
 	cmd := exec.Command(`/usr/bin/sqlite3`, `-noheader`, `-json`, connectionString) // n.b. doesn't support `--`
 
-	pw, err := cmd.StdinPipe()
-	if err != nil {
-		return nil, err
-	}
-
-	pr, err := cmd.StdoutPipe()
-	if err != nil {
-		return nil, err
-	}
-
-	pe, err := cmd.StderrPipe()
-	if err != nil {
-		return nil, err
-	}
-
-	err = cmd.Start()
+	chEvents, pw, err := ExecEvents(cmd)
 	if err != nil {
 		return nil, err
 	}
 
 	return &SCConn{
-		stdout: pr,
-		stderr: pe,
+		listen: chEvents,
 		w:      pw,
 	}, nil
 }
@@ -90,8 +76,7 @@ var _ driver.Connector = &SCConnector{} // interface assertion
 //
 
 type SCConn struct {
-	stdout io.Reader
-	stderr io.Reader
+	listen <-chan processEvent
 	w      io.WriteCloser
 }
 
@@ -105,6 +90,10 @@ func (c *SCConn) Prepare(query string) (driver.Stmt, error) {
 		return nil, errors.New("Empty query")
 	}
 
+	if f[len(f)-1] != ";" {
+		f = append(f, ";") // Query must end in semicolon
+	}
+
 	return &SCStmt{
 		conn:  c,
 		query: f,
@@ -216,24 +205,102 @@ func (s *SCStmt) Exec(args []driver.Value) (driver.Result, error) {
 }
 
 func (s *SCStmt) Query(args []driver.Value) (driver.Rows, error) {
+	ctx := context.Background()
 
 	submit, err := s.buildQuery(args)
 	if err != nil {
 		return nil, err
 	}
 
+	// If there are no results to the query, the sqlite3 -json mode does not
+	// print anything on stdout at all and we would hang forever
+	// Add a followup sentinel query that we can detect
+	const sentinelKey = `__sqliteclidriver_sentinel`
+	sentinelVal := uuid.Must(uuid.NewRandom()).String()
+	submit = append(submit, []byte(fmt.Sprintf("SELECT \"%s\" AS %s;\n", sentinelVal, sentinelKey))...)
+
+	//
+
 	_, err = io.CopyN(s.conn.w, bytes.NewReader(submit), int64(len(submit)))
 	if err != nil {
 		return nil, fmt.Errorf("Write: %w", err)
 	}
 
+	// Consume process events until either error or the json decoder is satisfied
+	pr, pw := io.Pipe()
+
+	listenContext, listenContextCancel := context.WithCancel(ctx) // Use to stop signalling once json decoder is satisfied
+
+	go func() {
+		defer pw.Close()
+		for {
+			select {
+			case msg, ok := <-s.conn.listen:
+				if !ok {
+					pw.CloseWithError(fmt.Errorf("process already closed"))
+					return
+				}
+				if msg.err != nil {
+					pw.CloseWithError(msg.err)
+					return
+				}
+
+				if msg.evtype == evtypeStdout {
+					_, err := io.CopyN(pw, bytes.NewReader(msg.data), int64(len(msg.data)))
+					if err != nil {
+						pw.CloseWithError(msg.err)
+						return
+					}
+
+				} else {
+					// Anything else (process event / stderr)
+					// Throw
+					pw.CloseWithError(msg)
+					return
+				}
+
+			case <-listenContext.Done():
+				return
+			}
+		}
+	}()
+
 	// We expect some kind of thing on stdout
-	ret := []map[string]any{}
-	err = json.NewDecoder(s.conn.stdout).Decode(&ret)
+	// If something happens on stderr, or to the process, pr will read an error
+	ret := []OrderedKV{}
+	decoder := json.NewDecoder(pr)
+	err = decoder.Decode(&ret)
 	if err != nil {
 		return nil, err
 	}
 
+	// Check if this was the data or the sentinel
+	wasSentinel := false
+	if len(ret) > 0 && len(ret[0]) > 0 && ret[0][0].Key == sentinelKey {
+		if check, ok := ret[0][0].Value.(string); ok && check == sentinelVal {
+			// It was the sentinel
+			wasSentinel = true
+			// Nothing more to parse
+		}
+	}
+
+	if wasSentinel {
+		// There was no data.
+		// Wipe out `ret`
+		ret = nil
+
+	} else {
+		// There was data.
+		// Need to decode again (from the same decoder reader) until we find the sentinel
+		surplus := []map[string]any{}
+		err = decoder.Decode(&surplus)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	listenContextCancel()
+
 	// Drain stderr
 	// TODO
 
@@ -243,8 +310,8 @@ func (s *SCStmt) Query(args []driver.Value) (driver.Rows, error) {
 
 	var columnNames []string
 	if len(ret) > 0 {
-		for k, _ := range ret[0] {
-			columnNames = append(columnNames, k)
+		for _, cell := range ret[0] {
+			columnNames = append(columnNames, cell.Key)
 		}
 	}
 
@@ -278,7 +345,7 @@ var _ driver.Result = &SCResult{} // interface assertion
 type SCRows struct {
 	idx     int
 	columns []string
-	data    []map[string]any
+	data    []OrderedKV
 }
 
 func (r *SCRows) Columns() []string {
@@ -301,12 +368,9 @@ func (r *SCRows) Next(dest []driver.Value) error {
 	}
 
 	for i := 0; i < len(dest); i++ {
-		cell, ok := r.data[r.idx][r.columns[i]]
-		if !ok {
-			return fmt.Errorf("Result row %d is missing column #%d %q, unexpected", r.idx, i, r.columns[i])
-		}
+		cell := r.data[r.idx][i]
 
-		dest[i] = cell
+		dest[i] = cell.Value
 	}
 
 	r.idx++

sqliteclidriver/sqliteclidriver_test.go

@@ -55,3 +55,24 @@ func TestSqliteCliDriver(t *testing.T) {
 
 	}
 }
+
+func TestSqliteCliDriverNoResults(t *testing.T) {
+	db, err := sql.Open("sqliteclidriver", ":memory:")
+	require.NoError(t, err)
+
+	// Repeat this part to ensure we can make followup queries on the same connection
+	for i := 0; i < 3; i++ {
+		_, err = db.Query(`SELECT 1 AS expect_no_result WHERE 1=2`)
+		require.NoError(t, err)
+
+		// Mix of results and no-results
+		rr := db.QueryRow(`SELECT 1 AS expect_result WHERE 1=1`)
+		require.NoError(t, rr.Err())
+
+		var result int64
+		err = rr.Scan(&result)
+		require.NoError(t, err)
+		require.EqualValues(t, result, 1)
+	}
+
+}

util_types.go

@@ -8,4 +8,14 @@ func box_interface[T any](input []T) []interface{} {
 		ret = append(ret, v)
 	}
 	return ret
+}
+
+func int32slice_contains(haystack []int32, needle int32) bool {
+	for _, v := range haystack {
+		if v == needle {
+			return true
+		}
+	}
+	
+	return false
 }

util_vcl.go

@@ -1,14 +1,19 @@
 package main
 
 import (
+	"runtime"
+
 	"github.com/ying32/govcl/vcl"
 	"github.com/ying32/govcl/vcl/types"
+	"github.com/ying32/govcl/vcl/types/colors"
 )
 
 const (
 	MY_SPACING = 6
 	MY_HEIGHT  = 90
 	MY_WIDTH   = 180
+
+	MAX_AUTO_COL_WIDTH = 240
 )
 
 // vcl_row makes a TPanel row inside the target component.
@@ -49,3 +54,70 @@ func vcl_menuseparator(parent *vcl.TMenuItem) *vcl.TMenuItem {
 
 	return s
 }
+
+func vcl_default_tab_background() types.TColor {
+	if runtime.GOOS == "windows" {
+		// Assuming that uxtheme is loaded
+		// @ref https://stackoverflow.com/a/20332712
+		// return colors.ClBtnHighlight
+
+		// None of the colors.** constants seem to be quite right on a test
+		// Windows 11 machine - should be #f9f9f9
+		return 0x00f9f9f9
+	} else {
+		return colors.ClBtnFace // 0x00f0f0f0
+	}
+}
+
+func vcl_stringgrid_clear(d *vcl.TStringGrid) {
+	d.SetFixedCols(0) // No left-hand cols
+	d.SetRowCount(1)  // The 0th row is the column headers
+	d.SetEnabled(false)
+	d.Columns().Clear()
+	d.Invalidate()
+}
+
+func vcl_stringgrid_columnwidths(d *vcl.TStringGrid) {
+	// Skip slow processing for very large result sets
+	if d.RowCount() > 1000 {
+		return
+	}
+
+	d.AutoAdjustColumns()
+
+	// AutoAdjustColumns will leave some columns massively too large by themselves
+	// Reign them back in
+	ct := d.Columns().Count()
+	for i := int32(0); i < ct; i++ {
+		if d.ColWidths(i) > MAX_AUTO_COL_WIDTH {
+			d.SetColWidths(i, MAX_AUTO_COL_WIDTH)
+		}
+	}
+}
+
+func vcl_confirm_dialog(sender vcl.IComponent, title string, message string) bool {
+
+	dlg := vcl.NewTaskDialog(sender)
+	dlg.SetCaption(APPNAME)
+	dlg.SetTitle(title)
+	dlg.SetText(message)
+	dlg.SetCommonButtons(types.NewSet())
+
+	yesBtn := dlg.Buttons().Add()
+	yesBtn.SetCaption("Confirm")
+	yesBtn.SetModalResult(types.MrYes)
+
+	noBtn := dlg.Buttons().Add()
+	noBtn.SetCaption("Cancel")
+	noBtn.SetModalResult(types.MrCancel)
+
+	ret := dlg.Execute()
+	if !ret {
+		return false // dialog closed
+	}
+	if dlg.ModalResult() != types.MrYes {
+		return false // other button clicked
+	}
+
+	return true // confirmed
+}