sqlite: pull table schema

bolt.go

@@ -82,7 +82,7 @@ var _ loadedDatabase = &boltLoadedDatabase{} // interface assertion
 
 //
 
-func (f *TMainForm) addDatabaseFromFile(path string) {
+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 {

main.go

@@ -41,14 +41,19 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	mnuFile.SetCaption("File")
 
 	mnuFileOpen := vcl.NewMenuItem(mnuFile)
-	mnuFileOpen.SetCaption("Open...")
+	mnuFileOpen.SetCaption("Open Bolt database...")
 	mnuFileOpen.SetShortCutFromString("Ctrl+O")
 	mnuFileOpen.SetOnClick(f.OnMnuFileOpenClick)
 	mnuFile.Add(mnuFileOpen)
 
+	mnuFileSqliteOpen := vcl.NewMenuItem(mnuFile)
+	mnuFileSqliteOpen.SetCaption("Open SQLite database...")
+	mnuFileSqliteOpen.SetOnClick(f.OnMnuFileSqliteOpenClick)
+	mnuFile.Add(mnuFileSqliteOpen)
+
 	mnuFileSqliteMemory := vcl.NewMenuItem(mnuFile)
 	mnuFileSqliteMemory.SetCaption("New SQLite in-memory database")
-	mnuFileSqliteMemory.SetOnClick(f.OnmnuFileSqliteMemoryClick)
+	mnuFileSqliteMemory.SetOnClick(f.OnMnuFileSqliteMemoryClick)
 	mnuFile.Add(mnuFileSqliteMemory)
 
 	mnuSep := vcl.NewMenuItem(mnuFile)
@@ -116,21 +121,31 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 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) OnmnuFileSqliteMemoryClick(sender vcl.IObject) {
-	f.SQLite_AddFromFile(`:memory:`)
-}
-
 func (f *TMainForm) OnNavChange(sender vcl.IObject, node *vcl.TTreeNode) {
 
 	if node.Data() == nil {

sqlite.go

@@ -49,10 +49,24 @@ func (ld *sqliteLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 		f.contentBox.SetEnabled(false)
 		f.contentBox.Clear()
 
-	} else if ndata.bucketPath[0] == sqliteTablesCaption {
+	} else if len(ndata.bucketPath) == 2 && ndata.bucketPath[0] == sqliteTablesCaption {
 		// Render for specific table
-		f.propertiesBox.SetText(fmt.Sprintf("Selected table %q", ndata.bucketPath[1]))
+		tableName := ndata.bucketPath[1]
-		// Load schema
+
+		// 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))
+
+		// Load column details
+		ld.db.Query(`pragma table_info(?)`, tableName)
+
 		// Select * with small limit
 		f.contentBox.SetEnabled(false)
 		f.contentBox.Clear()
@@ -71,7 +85,7 @@ func (ld *sqliteLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 		return []string{sqliteTablesCaption}, nil
 	}
 
-	if ndata.bucketPath[0] == sqliteTablesCaption {
+	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
@@ -95,6 +109,10 @@ func (ld *sqliteLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 		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)
 }
 
@@ -102,7 +120,7 @@ var _ loadedDatabase = &sqliteLoadedDatabase{} // interface assertion
 
 //
 
-func (f *TMainForm) SQLite_AddFromFile(path string) {
+func (f *TMainForm) sqliteAddDatabaseFromFile(path string) {
 
 	// TODO load in background thread to stop blocking the UI
 	db, err := sql.Open("sqlite3", path)