doc/README: fill in current statuses

README.md

@@ -1,21 +1,41 @@
 # yvbolt
 
-A graphical browser for [Bolt databases](https://github.com/etcd-io/bbolt) using [GoVCL](https://z-kit.cc/en/).
+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).
 
 ## Features
 
-- Supports Bolt databases using the upstream etcd.io/bbolt library
+- Native desktop application, running on Linux, Windows, and macOS
-  - Browse database content
+- Supported databases:
-  - Recursive bucket support
+  - Bolt
-  - Safe handling for non-UTF8 key and data fields
+    - Full compatibility via the upstream [etcd-io/bbolt](https://github.com/etcd-io/bbolt) library
-- No CGO for easy cross-compilation
+    - Browse database content
-- Permissive ISC license
+    - Recursive bucket support
+    - Safe handling for non-UTF8 key and data fields
+  - SQLite
+    - Browse table content
+
+## License
+
+The code in this project is licensed under the ISC license (see `LICENSE` file for details).
+
+This project redistributes images from the famfamfam/silk icon set under the [CC-BY 2.5 license](http://creativecommons.org/licenses/by/2.5/).
 
 ## Usage
 
-1. `go build`
+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)
 3. Place the liblcl library file in the same directory as `yvbolt`
 4. Run `yvbolt` and use the main menu to open a database
+
+## Changelog
+
+2024-06-08 v0.2.0
+
+- Add SQLite support (now requires CGo)
+- Add images for menu and navigation items
+
+2024-06-03 v0.1.0
+
+- Initial public release

bolt.go

@@ -0,0 +1,190 @@
+package main
+
+import (
+	"fmt"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+	"unsafe"
+
+	"github.com/ying32/govcl/vcl"
+	"github.com/ying32/govcl/vcl/types"
+	"go.etcd.io/bbolt"
+)
+
+type boltLoadedDatabase struct {
+	displayName string
+	path        string
+	db          *bbolt.DB
+	nav         *vcl.TTreeNode
+
+	arena []*navData // keepalive
+}
+
+func (ld *boltLoadedDatabase) DisplayName() string {
+	return ld.displayName
+}
+
+func (ld *boltLoadedDatabase) RootElement() *vcl.TTreeNode {
+	return ld.nav
+}
+
+func (ld *boltLoadedDatabase) Keepalive(ndata *navData) {
+	ld.arena = append(ld.arena, ndata)
+}
+
+func (ld *boltLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+
+	// Load properties
+
+	bucketDisplayName := strings.Join(ndata.bucketPath, `/`)
+	content := fmt.Sprintf("Selected database: %#v\n\n\nSelected bucket: %q\n", ld.db.Stats(), bucketDisplayName)
+	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)
+	colVal := f.contentBox.Columns().Add()
+	colVal.SetCaption("Value")
+
+	err := ld.db.View(func(tx *bbolt.Tx) error {
+		b := boltTargetBucket(tx, ndata.bucketPath)
+		if b == nil {
+			// no such bucket
+			return nil
+		}
+
+		// 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))
+		}
+		return nil
+	})
+	if err != nil {
+		vcl.ShowMessage(fmt.Sprintf("Failed to load data for bucket %q: %s", bucketDisplayName, err.Error()))
+		return
+	}
+
+	// Valid
+	f.contentBox.SetEnabled(true)
+}
+
+func (ld *boltLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
+	// In the bolt implementation, the nav is a recursive tree of child buckets
+	return boltChildBucketNames(ld.db, ndata.bucketPath)
+}
+
+var _ loadedDatabase = &boltLoadedDatabase{} // interface assertion
+
+//
+
+func (f *TMainForm) boltAddDatabaseFromFile(path string) {
+	// TODO load in background thread to stop blocking the UI
+	db, err := bbolt.Open(path, 0644, &bbolt.Options{Timeout: 1 * time.Second})
+	if err != nil {
+		vcl.ShowMessage(fmt.Sprintf("Failed to load database '%s': %s", path, err.Error()))
+		return
+	}
+
+	ld := &boltLoadedDatabase{
+		path:        path,
+		displayName: filepath.Base(path),
+		db:          db,
+	}
+
+	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
+	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
+	ld.nav.SetImageIndex(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)
+
+	ld.Keepalive(navData)
+}
+
+func boltTargetBucket(tx *bbolt.Tx, path []string) *bbolt.Bucket {
+
+	// If we are already deep in buckets, go directly there to find children
+	if len(path) == 0 {
+		return nil
+	}
+
+	b := tx.Bucket([]byte(path[0]))
+	if b == nil {
+		return nil // unexpectedly missing
+	}
+
+	for i := 1; i < len(path); i += 1 {
+		b = b.Bucket([]byte(path[i]))
+		if b == nil {
+			return nil // unexpectedly missing
+		}
+	}
+
+	return b // OK
+}
+
+func boltChildBucketNames(db *bbolt.DB, path []string) ([]string, error) {
+	var nextBucketNames []string
+
+	err := db.View(func(tx *bbolt.Tx) error {
+
+		// If we are already deep in buckets, go directly there to find children
+		if len(path) > 0 {
+			b := tx.Bucket([]byte(path[0]))
+			if b == nil {
+				return fmt.Errorf("Unexpected missing root bucket %q", path[0])
+			}
+
+			for i := 1; i < len(path); i += 1 {
+				b = b.Bucket([]byte(path[i]))
+				if b == nil {
+					return fmt.Errorf("Unexpected missing bucket %q", strings.Join(path[0:i], `/`))
+				}
+			}
+
+			// Find child buckets of this bucket
+			b.ForEachBucket(func(bucketName []byte) error {
+				nextBucketNames = append(nextBucketNames, string(bucketName))
+				return nil
+			})
+
+		} else {
+			// Find root bucket names
+			return tx.ForEach(func(bucketName []byte, _ *bbolt.Bucket) error {
+				nextBucketNames = append(nextBucketNames, string(bucketName))
+				return nil
+			})
+		}
+
+		// OK
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	sort.Strings(nextBucketNames)
+
+	return nextBucketNames, nil
+}

format.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"fmt"
+	"unicode/utf8"
+)
+
+func formatUtf8(in []byte) string {
+	if !utf8.Valid(in) {
+		return fmt.Sprintf("<<Invalid UTF-8 %q>>", in)
+	}
+
+	return string(in)
+}
+
+func formatAny(in interface{}) string {
+	if _, ok := in.([]byte); ok {
+		return "<<binary>>"
+	}
+
+	return fmt.Sprintf("%#v", in)
+}

go.mod

@@ -3,6 +3,7 @@ module yvbolt
 go 1.19
 
 require (
+	github.com/mattn/go-sqlite3 v1.14.22 // indirect
 	github.com/ying32/govcl v2.2.3+incompatible // indirect
 	go.etcd.io/bbolt v1.3.10 // indirect
 	golang.org/x/sys v0.4.0 // indirect

go.sum

@@ -1,3 +1,5 @@
+github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=
+github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
 github.com/ying32/govcl v2.2.3+incompatible h1:Iyfcl26yNE1USm+3uG+btQyhkoFIV18+VITrUdHu8Lw=
 github.com/ying32/govcl v2.2.3+incompatible/go.mod h1:yZVtbJ9Md1nAVxtHKIriKZn4K6TQYqI1en3sN/m9FJ8=
 go.etcd.io/bbolt v1.3.10 h1:+BqfJTcCzTItrop8mq/lbzL8wSGtj94UO/3U31shqG0=

images.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"embed"
+
+	"github.com/ying32/govcl/vcl"
+)
+
+//go:embed assets/*
+var assetsFs embed.FS
+
+const (
+	imgDatabase       = 0
+	imgDatabaseAdd    = 1
+	imgDatabaseDelete = 2
+	imgDatabaseSave   = 3
+	imgTable          = 4
+	imgTableAdd       = 5
+	imgTableDelete    = 6
+	imgTableSave      = 7
+)
+
+func loadImages(owner vcl.IComponent) *vcl.TImageList {
+
+	mustLoad := func(n string) *vcl.TBitmap {
+		imgData, err := assetsFs.ReadFile(n)
+		if err != nil {
+			panic(err)
+		}
+
+		png := vcl.NewPngImage()
+		png.LoadFromBytes(imgData)
+
+		ret := vcl.NewBitmap()
+		ret.Assign(png)
+		return ret
+	}
+
+	ilist := vcl.NewImageList(owner)
+	ilist.Add(mustLoad("assets/database.png"), nil)
+	ilist.Add(mustLoad("assets/database_add.png"), nil)
+	ilist.Add(mustLoad("assets/database_delete.png"), nil)
+	ilist.Add(mustLoad("assets/database_save.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)
+	return ilist
+
+}

loadedDatabase.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"github.com/ying32/govcl/vcl"
+)
+
+// loadedDatabase is a DB-agnostic interface for each loaded database.
+type loadedDatabase interface {
+	DisplayName() string
+	RootElement() *vcl.TTreeNode
+	RenderForNav(f *TMainForm, ndata *navData)
+	NavChildren(ndata *navData) ([]string, error)
+	Keepalive(ndata *navData)
+}
+
+// navData is the .Data() pointer for each TTreeNode in the left-hand tree.
+type navData struct {
+	ld             loadedDatabase
+	childrenLoaded bool
+	bucketPath     []string
+}

main.go

@@ -2,43 +2,31 @@ package main
 
 import (
 	"fmt"
-	"path/filepath"
+	"os"
-	"sort"
 	"strings"
-	"time"
-	"unicode/utf8"
 	"unsafe"
 
 	_ "github.com/ying32/govcl/pkgs/winappres" // Extra _syso files for Windows
 	"github.com/ying32/govcl/vcl"
 	"github.com/ying32/govcl/vcl/types"
-
-	"go.etcd.io/bbolt"
 )
 
-type loadedDatabase struct {
+const (
-	displayName string
+	MY_SPACING = 6
-	path        string
+	MY_WIDTH   = 180
-	db          *bbolt.DB
+)
-	nav         *vcl.TTreeNode
-}
-
-type navData struct {
-	ld             *loadedDatabase
-	childrenLoaded bool
-	bucketPath     []string
-}
 
 type TMainForm struct {
 	*vcl.TForm
+
+	ImageList     *vcl.TImageList
 	Menu          *vcl.TMainMenu
 	Buckets       *vcl.TTreeView
 	Tabs          *vcl.TPageControl
 	propertiesBox *vcl.TMemo
 	contentBox    *vcl.TListView
 
-	dbs   []loadedDatabase
+	dbs []loadedDatabase
-	arena []*navData // keepalive
 }
 
 var (
@@ -50,8 +38,7 @@ func main() {
 }
 
 func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
-	const MY_SPACING = 6
+	f.ImageList = loadImages(f)
-	const MY_WIDTH = 180
 
 	f.SetCaption("yvbolt")
 
@@ -59,16 +46,40 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	mnuFile.SetCaption("File")
 
 	mnuFileOpen := vcl.NewMenuItem(mnuFile)
-	mnuFileOpen.SetCaption("Open...")
+	mnuFileOpen.SetCaption("Open Bolt database...")
+	mnuFileOpen.SetImageIndex(imgDatabaseAdd)
 	mnuFileOpen.SetShortCutFromString("Ctrl+O")
 	mnuFileOpen.SetOnClick(f.OnMnuFileOpenClick)
 	mnuFile.Add(mnuFileOpen)
 
+	mnuFileSqliteOpen := vcl.NewMenuItem(mnuFile)
+	mnuFileSqliteOpen.SetCaption("Open SQLite database...")
+	mnuFileSqliteOpen.SetImageIndex(imgDatabaseAdd)
+	mnuFileSqliteOpen.SetOnClick(f.OnMnuFileSqliteOpenClick)
+	mnuFile.Add(mnuFileSqliteOpen)
+
+	mnuFileSqliteMemory := vcl.NewMenuItem(mnuFile)
+	mnuFileSqliteMemory.SetCaption("New SQLite in-memory database")
+	mnuFileSqliteMemory.SetImageIndex(imgDatabaseAdd)
+	mnuFileSqliteMemory.SetOnClick(f.OnMnuFileSqliteMemoryClick)
+	mnuFile.Add(mnuFileSqliteMemory)
+
+	mnuSep := vcl.NewMenuItem(mnuFile)
+	mnuSep.SetCaption("-") // Creates separator
+	mnuFile.Add(mnuSep)
+
+	mnuFileExit := vcl.NewMenuItem(mnuFile)
+	mnuFileExit.SetCaption("Exit")
+	mnuFileExit.SetOnClick(f.OnMnuFileExitClick)
+	mnuFile.Add(mnuFileExit)
+
 	f.Menu = vcl.NewMainMenu(f)
+	f.Menu.SetImages(f.ImageList)
 	f.Menu.Items().Add(mnuFile)
 
 	f.Buckets = vcl.NewTreeView(f)
 	f.Buckets.SetParent(f)
+	f.Buckets.SetImages(f.ImageList)
 	f.Buckets.SetAlign(types.AlLeft)
 	f.Buckets.SetWidth(MY_WIDTH)
 	f.Buckets.SetReadOnly(true) // prevent click to rename on nodes
@@ -108,25 +119,37 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	f.contentBox.SetViewStyle(types.VsReport) // "Report style" i.e. has columns
 	f.contentBox.SetAutoWidthLastColumn(true)
 	f.contentBox.SetReadOnly(true)
-	colKey := f.contentBox.Columns().Add()
+	f.contentBox.Columns().Clear()
-	colKey.SetCaption("Key")
-	colKey.SetWidth(MY_WIDTH)
-	colKey.SetAlignment(types.TaLeftJustify)
-	colVal := f.contentBox.Columns().Add()
-	colVal.SetCaption("Value")
-
 }
 
 func (f *TMainForm) OnMnuFileOpenClick(sender vcl.IObject) {
 	dlg := vcl.NewOpenDialog(f)
 	dlg.SetTitle("Select a database file...")
-	dlg.SetFilter("Bolt database|*.db|SQLite database|*.db3|All files|*.*")
+	dlg.SetFilter("Bolt database|*.db|All files|*.*")
 	ret := dlg.Execute() // Fake blocking
 	if ret {
-		f.addDatabaseFromFile(dlg.FileName())
+		f.boltAddDatabaseFromFile(dlg.FileName())
 	}
 }
 
+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|*.*")
+	ret := dlg.Execute() // Fake blocking
+	if ret {
+		f.sqliteAddDatabaseFromFile(dlg.FileName())
+	}
+}
+
+func (f *TMainForm) OnMnuFileSqliteMemoryClick(sender vcl.IObject) {
+	f.sqliteAddDatabaseFromFile(`:memory:`)
+}
+
+func (f *TMainForm) OnMnuFileExitClick(sender vcl.IObject) {
+	os.Exit(0)
+}
+
 func (f *TMainForm) OnNavChange(sender vcl.IObject, node *vcl.TTreeNode) {
 
 	if node.Data() == nil {
@@ -135,118 +158,7 @@ func (f *TMainForm) OnNavChange(sender vcl.IObject, node *vcl.TTreeNode) {
 	}
 
 	ndata := (*navData)(node.Data())
-
+	ndata.ld.RenderForNav(f, ndata) // Handover to the database type's own renderer function
-	// Load properties
-
-	bucketDisplayName := strings.Join(ndata.bucketPath, `/`)
-	content := fmt.Sprintf("Selected database: %#v\n\n\nSelected bucket: %q\n", ndata.ld.db.Stats(), bucketDisplayName)
-	f.propertiesBox.SetText(content)
-
-	// Load data
-
-	f.contentBox.SetEnabled(false)
-	f.contentBox.Clear()
-
-	err := ndata.ld.db.View(func(tx *bbolt.Tx) error {
-		b := boltTargetBucket(tx, ndata.bucketPath)
-		if b == nil {
-			// no such bucket
-			return nil
-		}
-
-		// 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))
-		}
-		return nil
-	})
-	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to load data for bucket %q: %s", bucketDisplayName, err.Error()))
-		return
-	}
-
-	// Valid
-	f.contentBox.SetEnabled(true)
-}
-
-func formatUtf8(in []byte) string {
-	if !utf8.Valid(in) {
-		return fmt.Sprintf("<<Invalid UTF-8 %q>>", in)
-	}
-
-	return string(in)
-}
-
-func boltTargetBucket(tx *bbolt.Tx, path []string) *bbolt.Bucket {
-
-	// If we are already deep in buckets, go directly there to find children
-	if len(path) == 0 {
-		return nil
-	}
-
-	b := tx.Bucket([]byte(path[0]))
-	if b == nil {
-		return nil // unexpectedly missing
-	}
-
-	for i := 1; i < len(path); i += 1 {
-		b = b.Bucket([]byte(path[i]))
-		if b == nil {
-			return nil // unexpectedly missing
-		}
-	}
-
-	return b // OK
-}
-
-func boltChildBucketNames(db *bbolt.DB, path []string) ([]string, error) {
-	var nextBucketNames []string
-
-	err := db.View(func(tx *bbolt.Tx) error {
-
-		// If we are already deep in buckets, go directly there to find children
-		if len(path) > 0 {
-			b := tx.Bucket([]byte(path[0]))
-			if b == nil {
-				return fmt.Errorf("Unexpected missing root bucket %q", path[0])
-			}
-
-			for i := 1; i < len(path); i += 1 {
-				b = b.Bucket([]byte(path[i]))
-				if b == nil {
-					return fmt.Errorf("Unexpected missing bucket %q", strings.Join(path[0:i], `/`))
-				}
-			}
-
-			// Find child buckets of this bucket
-			b.ForEachBucket(func(bucketName []byte) error {
-				nextBucketNames = append(nextBucketNames, string(bucketName))
-				return nil
-			})
-
-		} else {
-			// Find root bucket names
-			return tx.ForEach(func(bucketName []byte, _ *bbolt.Bucket) error {
-				nextBucketNames = append(nextBucketNames, string(bucketName))
-				return nil
-			})
-		}
-
-		// OK
-		return nil
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	sort.Strings(nextBucketNames)
-
-	return nextBucketNames, nil
 }
 
 func (f *TMainForm) OnNavExpanding(sender vcl.IObject, node *vcl.TTreeNode, allowExpansion *bool) {
@@ -264,7 +176,7 @@ func (f *TMainForm) OnNavExpanding(sender vcl.IObject, node *vcl.TTreeNode, allo
 	}
 
 	// Find the child buckets from this point under the element
-	nextBucketNames, err := boltChildBucketNames(ndata.ld.db, ndata.bucketPath)
+	nextBucketNames, err := ndata.ld.NavChildren(ndata)
 	if err != nil {
 		vcl.ShowMessage(fmt.Sprintf("Failed to find child buckets under %q: %s", strings.Join(ndata.bucketPath, `/`), err.Error()))
 		*allowExpansion = false
@@ -292,36 +204,10 @@ func (f *TMainForm) OnNavExpanding(sender vcl.IObject, node *vcl.TTreeNode, allo
 			navData.bucketPath = append(navData.bucketPath, ndata.bucketPath...)
 			navData.bucketPath = append(navData.bucketPath, bucketName)
 			node.SetData(unsafe.Pointer(navData))
-			f.arena = append(f.arena, navData) // keepalive
+
+			ndata.ld.Keepalive(navData)
 		}
 
 		*allowExpansion = true
 	}
 }
-
-func (f *TMainForm) addDatabaseFromFile(path string) {
-	// TODO load in background thread to stop blocking the UI
-	db, err := bbolt.Open(path, 0644, &bbolt.Options{Timeout: 1 * time.Second})
-	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to load database '%s': %s", path, err.Error()))
-		return
-	}
-
-	entry := loadedDatabase{
-		path:        path,
-		displayName: filepath.Base(path),
-		db:          db,
-	}
-
-	entry.nav = f.Buckets.Items().Add(nil, entry.displayName)
-	entry.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
-	navData := &navData{
-		ld:             &entry,
-		childrenLoaded: false,      // will be loaded dynamically
-		bucketPath:     []string{}, // empty = root
-	}
-	entry.nav.SetData(unsafe.Pointer(navData))
-
-	f.dbs = append(f.dbs, entry)
-	f.arena = append(f.arena, navData) // keepalive
-}

sqlite.go

@@ -0,0 +1,215 @@
+package main
+
+import (
+	"database/sql"
+	"fmt"
+	"path/filepath"
+	"unsafe"
+
+	_ "github.com/mattn/go-sqlite3"
+	"github.com/ying32/govcl/vcl"
+	"github.com/ying32/govcl/vcl/types"
+)
+
+const (
+	sqliteTablesCaption = "Tables"
+)
+
+type sqliteLoadedDatabase struct {
+	displayName string
+	path        string
+	db          *sql.DB
+	nav         *vcl.TTreeNode
+
+	arena []*navData // keepalive
+}
+
+func (ld *sqliteLoadedDatabase) DisplayName() string {
+	return ld.displayName
+}
+
+func (ld *sqliteLoadedDatabase) RootElement() *vcl.TTreeNode {
+	return ld.nav
+}
+
+func (ld *sqliteLoadedDatabase) Keepalive(ndata *navData) {
+	ld.arena = append(ld.arena, ndata)
+}
+
+func (ld *sqliteLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+
+	if len(ndata.bucketPath) == 0 {
+		// Top-level
+		f.propertiesBox.SetText("Please select...")
+		f.contentBox.SetEnabled(false)
+		f.contentBox.Clear()
+
+	} else if len(ndata.bucketPath) == 1 {
+		// Category (tables, ...)
+		f.propertiesBox.SetText("Please select...")
+		f.contentBox.SetEnabled(false)
+		f.contentBox.Clear()
+
+	} else if len(ndata.bucketPath) == 2 && ndata.bucketPath[0] == sqliteTablesCaption {
+		// Render for specific table
+		tableName := ndata.bucketPath[1]
+
+		// Get some basic properties
+		r := ld.db.QueryRow(`SELECT sql FROM sqlite_schema WHERE name = ?;`, tableName)
+		var schemaStmt string
+		err := r.Scan(&schemaStmt)
+		if err != nil {
+			schemaStmt = fmt.Sprintf("* Failed to describe table %q: %s", tableName, err.Error())
+		}
+
+		// 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
+		colr, err := ld.db.Query(`SELECT name FROM pragma_table_info(?)`, tableName)
+		if err != nil {
+			vcl.ShowMessageFmt("Failed to load columns for table %q: %s", tableName, err.Error())
+			return
+		}
+		defer colr.Close()
+
+		f.contentBox.Columns().Clear()
+		numColumns := 0
+		for colr.Next() {
+
+			var columnName string
+			err = colr.Scan(&columnName)
+			if err != nil {
+				vcl.ShowMessageFmt("Failed to read column names for table %q: %s", tableName, err.Error())
+				return
+			}
+
+			col := f.contentBox.Columns().Add()
+			col.SetCaption(columnName)
+			col.SetWidth(MY_WIDTH)
+			col.SetAlignment(types.TaLeftJustify)
+
+			numColumns++
+		}
+		if colr.Err() != nil {
+			vcl.ShowMessageFmt("Failed to load columns for table %q: %s", tableName, err.Error())
+			return
+		}
+		colr.Close() // will be double-closed
+
+		// 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
+		}
+		defer datar.Close()
+
+		for datar.Next() {
+			fields := make([]interface{}, numColumns)
+			pfields := make([]interface{}, numColumns)
+			for i := 0; i < numColumns; i += 1 {
+				pfields[i] = &fields[i]
+			}
+
+			err = datar.Scan(pfields...)
+			if err != nil {
+				vcl.ShowMessageFmt("Failed to load data for table %q: %s", tableName, err.Error())
+				return
+			}
+
+			dataEntry := f.contentBox.Items().Add()
+			dataEntry.SetCaption(formatAny(fields[0]))
+			for i := 1; i < len(fields); i += 1 {
+				dataEntry.SubItems().Add(formatAny(fields[i]))
+			}
+
+		}
+
+		// We successfully populated the data grid
+		f.contentBox.SetEnabled(true)
+
+	} else {
+		// ??? unknown
+
+	}
+
+}
+
+func (ld *sqliteLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
+
+	if len(ndata.bucketPath) == 0 {
+		// The top-level children are always:
+		return []string{sqliteTablesCaption}, nil
+	}
+
+	if len(ndata.bucketPath) == 1 && ndata.bucketPath[0] == sqliteTablesCaption {
+		rr, err := ld.db.Query(`SELECT name FROM sqlite_master WHERE type='table' ORDER BY name ASC;`)
+		if err != nil {
+			return nil, err
+		}
+		defer rr.Close()
+
+		var gather []string
+		for rr.Next() {
+			var tableName string
+			err = rr.Scan(&tableName)
+			if err != nil {
+				return nil, err
+			}
+
+			gather = append(gather, tableName)
+		}
+		if rr.Err() != nil {
+			return nil, rr.Err()
+		}
+
+		return gather, nil
+	}
+
+	if len(ndata.bucketPath) == 2 {
+		return nil, nil // Never any deeper children
+	}
+
+	return nil, fmt.Errorf("unknown nav path %#v", ndata.bucketPath)
+}
+
+var _ loadedDatabase = &sqliteLoadedDatabase{} // interface assertion
+
+//
+
+func (f *TMainForm) sqliteAddDatabaseFromFile(path string) {
+
+	// TODO load in background thread to stop blocking the UI
+	db, err := sql.Open("sqlite3", path)
+	if err != nil {
+		vcl.ShowMessage(fmt.Sprintf("Failed to load database '%s': %s", path, err.Error()))
+		return
+	}
+
+	ld := &sqliteLoadedDatabase{
+		path:        path,
+		displayName: filepath.Base(path),
+		db:          db,
+	}
+
+	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
+	ld.nav.SetImageIndex(imgDatabase)
+	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
+	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)
+
+	ld.Keepalive(navData)
+}