doc/README: add v0.7.0 download links

Makefile

@@ -1,6 +1,6 @@
 SHELL:=/bin/bash
-
 SOURCES=$(find . -name '*.go' -type f)
+.DEFAULT_GOAL := dist
 
 liblcl-2.2.3.zip:
 	rm -f liblcl-2.2.3.zip

README.md

@@ -1,13 +1,11 @@
 # yvbolt
 
-A graphical browser for multiple databases using [GoVCL](https://z-kit.cc/en/).
+A graphical interface 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).
 
 ## 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
@@ -17,12 +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
 
@@ -32,7 +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)
@@ -41,6 +43,20 @@ 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
@@ -51,6 +67,10 @@ This project includes trademarked logo images for each supported database type.
 - 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

TODO

@@ -1,6 +1,10 @@
-- Insert
+- Syntax highlighting in editor
-- Update cell
+- Mutation
-- Delete row(s)
+	- 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
@@ -10,19 +14,19 @@
 	- MSSQL (recursive navigation for instances)
 	- Other K/V stores from https://github.com/smallnest/kvbench 
 	- Windows registry
-- SSH tunnels
+	- LDAP
-- Badger encryption key dialog
+- Connection dialog
-- Pebble: connection options dialog
+	- SSH tunnels
-- SQLite: DB compact action
+	- Badger encryption key dialog
-- SQLite: DB export backup action
+	- Pebble: connection options dialog
-- SQLite: drop table action
-- SQLite: show views, triggers, indexes in nav
 - SQLite CLI driver:
+	- 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
 	- Build own liblcl binaries in docker
 	- Win32 icon resource
@@ -32,3 +36,6 @@
 	- 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.Title().SetCaption("Key")
-	colKey.SetWidth(MY_WIDTH)
-	colKey.SetAlignment(types.TaLeftJustify)
 	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()
+				rpos := f.contentBox.RowCount()
-				dataEntry.SetCaption(formatUtf8(k))
+				f.contentBox.SetRowCount(rpos + 1)
-				dataEntry.SubItems().Add(formatUtf8(v))
+				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 err
-		return
 	}
 
 	// 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.Title().SetCaption("Key")
-	colKey.SetWidth(MY_WIDTH)
-	colKey.SetAlignment(types.TaLeftJustify)
 	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()
+			rpos := f.contentBox.RowCount()
-			dataEntry.SetCaption(formatUtf8(k))
+			f.contentBox.SetRowCount(rpos + 1)
-			dataEntry.SubItems().Add(formatUtf8(v))
+			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 err
-		return
 	}
 
 	// 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)
 	}
-}
+	return nil
-
-func (ld *boltLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
-	vcl.ShowMessage("Bolt doesn't support querying")
 }
 
 func (ld *boltLoadedDatabase) Close() {

db_debconf.go

@@ -35,7 +35,7 @@ func (ld *debconfLoadedDatabase) Keepalive(ndata *navData) {
 	ld.arena = append(ld.arena, ndata)
 }
 
-func (ld *debconfLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+func (ld *debconfLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
 
 	// Load properties
 
@@ -44,36 +44,30 @@ func (ld *debconfLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 
 	// Load data
 
-	f.contentBox.SetEnabled(false)
-	f.contentBox.Clear()
-
-	// debconf always uses Key + Value as the columns
-
 	indexes := make(map[string]int)
 
-	f.contentBox.Columns().Clear()
 	for i, cname := range ld.db.AllColumnNames {
 		indexes[cname] = i
 
 		col := f.contentBox.Columns().Add()
-		col.SetCaption(cname)
+		col.Title().SetCaption(cname)
-		col.SetWidth(MY_WIDTH)
 	}
 
 	for _, entry := range ld.db.Entries {
 
-		cell := f.contentBox.Items().Add()
+		rpos := f.contentBox.RowCount()
-		cell.SetCaption(entry.Name)
+		f.contentBox.SetRowCount(rpos + 1)
+		f.contentBox.SetCells(0, rpos, entry.Name)
 
-		texts := make([]string, len(ld.db.AllColumnNames))
 		for _, proppair := range entry.Properties {
-			texts[indexes[proppair[0]]-1 /* compensate for 'Name' always being first */] = proppair[1]
+			f.contentBox.SetCells(int32(indexes[proppair[0]]), rpos, proppair[1])
 		}
-		cell.SubItems().AddStrings2(texts)
 	}
 
 	// Valid
+	vcl_stringgrid_columnwidths(f.contentBox)
 	f.contentBox.SetEnabled(true)
+	return nil
 }
 
 func (ld *debconfLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
@@ -91,10 +85,6 @@ func (ld *debconfLoadedDatabase) NavContext(ndata *navData) ([]contextAction, er
 	return nil, nil // No special actions are supported
 }
 
-func (ld *debconfLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
-	vcl.ShowMessage("debconf doesn't support querying")
-}
-
 func (ld *debconfLoadedDatabase) Close() {
 	ld.arena = nil
 }

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)
+	return nil
-	f.contentBox.Clear()
-}
-
-func (n *noLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
 }
 
 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.Title().SetCaption("Key")
-	colKey.SetWidth(MY_WIDTH)
-	colKey.SetAlignment(types.TaLeftJustify)
 	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 fmt.Errorf("Failed to load data for key %q: %w", formatAny(k), err)
-			return
 		}
 
-		dataEntry := f.contentBox.Items().Add()
+		rpos := f.contentBox.RowCount()
-		dataEntry.SetCaption(formatUtf8(k))
+		f.contentBox.SetRowCount(rpos + 1)
-		dataEntry.SubItems().Add(formatUtf8(v))
+		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 fmt.Errorf("Retreiving database info: %w", err)
-			return
 		}
 
 		f.propertiesBox.SetText(infostr)
 
-		// Disable data tab
+		// Leave data tab disabled (default behaviour)
-		f.contentBox.SetEnabled(false)
+		return nil
-		f.contentBox.Clear()
 
 	} 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 fmt.Errorf("Switching to database %q: %w", ndata.bucketPath[0], err)
-			return
 		}
 
 		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 fmt.Errorf("Listing keys in database %q: %w", ndata.bucketPath[0], err)
-			return
 		}
 
 		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.Title().SetCaption("Key")
-		colKey.SetWidth(MY_WIDTH)
-		colKey.SetAlignment(types.TaLeftJustify)
 		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 fmt.Errorf("Loading %q/%q: %w", ndata.bucketPath[0], key, err)
-				return
 			}
 
-			dataEntry := f.contentBox.Items().Add()
+			rpos := f.contentBox.RowCount()
-			dataEntry.SetCaption(key) // formatUtf8
+			f.contentBox.SetRowCount(rpos + 1)
-			dataEntry.SubItems().Add(typeName)
+			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 fmt.Errorf("Loading %q/%q: %w", ndata.bucketPath[0], key, err)
-					return
 				}
-				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 fmt.Errorf("Loading %q/%q: %w", ndata.bucketPath[0], key, err)
-					return
 				}
 				// 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 fmt.Errorf("Unexpected nav position %q", ndata.bucketPath)
-		return
 
 	}
 }
@@ -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 fmt.Errorf("Parsing the query: %w", err)
-		return
 	}
 
 	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 fmt.Errorf("The redis query returned an error: %w", err)
-		return
 	}
 
-	resultArea.SetEnabled(false)
+	vcl_stringgrid_clear(resultArea)
-	resultArea.Clear()
 
-	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()
+		rpos := resultArea.RowCount()
-		dataEntry.SetCaption(formatAny(ret)) // formatUtf8
+		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)
+		return nil
-		f.contentBox.Clear()
 
 	} else if len(ndata.bucketPath) == 1 {
 		// Category (tables, ...)
 		f.propertiesBox.SetText("Please select...")
-		f.contentBox.SetEnabled(false)
+		return nil
-		f.contentBox.Clear()
 
 	} 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 fmt.Errorf("Failed to load columns for table %q: %w", tableName)
-			return
 		}
 
 		populateColumns(columnNames, f.contentBox)
@@ -87,17 +84,19 @@ func (ld *sqliteLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 		// 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)
 		if err != nil {
-			vcl.ShowMessageFmt("Failed to load data for table %q: %s", tableName, err.Error())
+			return fmt.Errorf("Failed to load data for table %q: %w", tableName, err)
-			return
 		}
 		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) {
+func populateColumns(names []string, dest *vcl.TStringGrid) {
-	dest.Columns().Clear()
 	for _, columnName := range names {
 		col := dest.Columns().Add()
-		col.SetCaption(columnName)
+		col.Title().SetCaption(columnName)
-		col.SetWidth(MY_WIDTH)
-		col.SetAlignment(types.TaLeftJustify)
 	}
 }
 
-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()
+		rpos := dest.RowCount()
-		dataEntry.SetCaption(formatAny(fields[0]))
+		dest.SetRowCount(rpos + 1)
-		for i := 1; i < len(fields); i += 1 {
+		for i := 0; i < len(fields); i += 1 {
-			dataEntry.SubItems().Add(formatAny(fields[i]))
+			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 err
-		return
 	}
 
 	defer rr.Close()
 
-	resultArea.SetEnabled(false)
+	vcl_stringgrid_clear(resultArea)
-	resultArea.Clear()
 
 	columns, err := rr.Columns()
 	if err != nil {
-		vcl.ShowMessage(err.Error())
+		return err
-		return
 	}
 
 	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) {
+func (ld *sqliteLoadedDatabase) NavContext(ndata *navData) (ret []contextAction, err error) {
-	return nil, nil // No special actions are supported
+
+	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() {

images.go

@@ -10,14 +10,22 @@ 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
@@ -48,6 +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)
@@ -55,7 +66,14 @@ 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)
@@ -67,6 +85,7 @@ func loadImages(owner vcl.IComponent) *vcl.TImageList {
 	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
 
 }

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)
+	RenderForNav(f *TMainForm, ndata *navData) error
-	ExecQuery(query string, resultArea *vcl.TListView)
 	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

@@ -11,11 +11,17 @@ import (
 	"github.com/pkg/browser"
 	"github.com/ying32/govcl/vcl"
 	"github.com/ying32/govcl/vcl/types"
+	"github.com/ying32/govcl/vcl/types/colors"
 )
 
 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
+	contentBox    *vcl.TStringGrid
-	queryInput    *vcl.TMemo
+	dataInsertBtn *vcl.TToolButton
-	queryResult   *vcl.TListView
+	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)
@@ -135,7 +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)
@@ -207,14 +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.BorderSpacing().SetLeft(MY_SPACING)
-	f.contentBox.SetAlign(types.AlClient)     // fill remaining space
+	f.contentBox.BorderSpacing().SetRight(MY_SPACING)
-	f.contentBox.SetViewStyle(types.VsReport) // "Report style" i.e. has columns
+	f.contentBox.BorderSpacing().SetBottom(MY_SPACING)
-	f.contentBox.SetAutoWidthLastColumn(true)
+	f.contentBox.SetAlign(types.AlClient) // fill remaining space
-	f.contentBox.SetReadOnly(true)
+	f.contentBox.SetOptions(f.contentBox.Options().Include(types.GoThumbTracking, types.GoColSizing, types.GoDblClickAutoSize, types.GoEditing))
-	f.contentBox.Columns().Clear()
+	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)
@@ -232,13 +290,14 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	queryButtonBar.SetImages(f.ImageList)
 	queryButtonBar.SetShowCaptions(true)
 
-	queryExecBtn := vcl.NewToolButton(queryButtonBar)
+	f.queryExecBtn = vcl.NewToolButton(queryButtonBar)
-	queryExecBtn.SetParent(queryButtonBar)
+	f.queryExecBtn.SetParent(queryButtonBar)
-	queryExecBtn.SetCaption("Execute")
+	f.queryExecBtn.SetHint("Execute")
-	// queryExecBtn.SetImageIndex(imgLightning)
+	f.queryExecBtn.SetShowHint(true)
-	queryExecBtn.SetOnClick(f.OnQueryExecute)
+	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)
@@ -248,26 +307,27 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	} 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(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.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.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
@@ -276,7 +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)
@@ -286,7 +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)
@@ -296,7 +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)
@@ -308,7 +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)
@@ -451,7 +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)
@@ -475,6 +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()
 
@@ -491,6 +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 {
@@ -508,6 +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 {
@@ -520,6 +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 {
@@ -528,7 +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) {
@@ -541,7 +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())

util_types.go

@@ -9,3 +9,13 @@ func box_interface[T any](input []T) []interface{} {
 	}
 	return ret
 }
+
+func int32slice_contains(haystack []int32, needle int32) bool {
+	for _, v := range haystack {
+		if v == needle {
+			return true
+		}
+	}
+	
+	return false
+}

util_vcl.go

@@ -12,6 +12,8 @@ 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.
@@ -57,8 +59,65 @@ 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
+		// 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
+}