fix(sql-format): format source and DDL with proper dialects

apps/desktop/src/components/layout/ContentArea.vue

@@ -63,7 +63,7 @@ import type { SqlExecutionOverride } from "@/lib/sqlExecutionTarget";
 import type { DataGridSortMode } from "@/lib/dataGridSort";
 import { useTabScroll } from "@/composables/useTabScroll";
 import type { QueryTab, ConnectionConfig, TableInfoTab, TreeNode, VectorCollectionMeta } from "@/types/database";
-import type { SqlFormatDialect } from "@/lib/sqlFormatter";
+import { sqlFormatDialectForDbType, type SqlFormatDialect } from "@/lib/sqlFormatter";
 
 type DataGridHandle = {
   onToolbarRefresh: () => Promise<void> | void;
@@ -196,23 +196,7 @@ const activeTabDimension = computed(() => {
   return meta && "dimension" in meta ? (meta as VectorCollectionMeta).dimension : undefined;
 });
 
-const activeSqlFormatDialect = computed<SqlFormatDialect>(() => {
+const activeSqlFormatDialect = computed<SqlFormatDialect>(() => sqlFormatDialectForDbType(activeEffectiveDatabaseType.value));
-  switch (activeEffectiveDatabaseType.value) {
-    case "mysql":
-      return "mysql";
-    case "postgres":
-    case "kwdb":
-      return "postgres";
-    case "sqlite":
-    case "rqlite":
-    case "turso":
-      return "sqlite";
-    case "sqlserver":
-      return "sqlserver";
-    default:
-      return "generic";
-  }
-});
 
 const editorDialect = computed<"mysql" | "postgres" | "sqlserver">(() => {
   if (activeEffectiveDatabaseType.value === "postgres" || activeEffectiveDatabaseType.value === "kwdb") return "postgres";

apps/desktop/src/components/objects/DdlViewDialog.vue

@@ -8,6 +8,7 @@ import { useSettingsStore } from "@/stores/settingsStore";
 import { loadEditorTheme, editorFontTheme } from "@/lib/editorThemes";
 import { createDbxCodeMirrorSqlDialect } from "@/lib/codemirrorSqlDialect";
 import { copyToClipboard } from "@/lib/clipboard";
+import { formatSqlForDisplay, type SqlFormatDialect } from "@/lib/sqlFormatter";
 import * as api from "@/lib/api";
 import { Button } from "@/components/ui/button";
 import { Dialog, DialogContent, DialogFooter, DialogHeader, DialogTitle } from "@/components/ui/dialog";
@@ -23,6 +24,8 @@ const props = withDefaults(
     tableName: string;
     /** SQL dialect for syntax highlighting. Non-PG/non-MSSQL databases fall back to MySQL (same as QueryEditor's source viewer). */
     dialect: "mysql" | "postgres" | "sqlserver";
+    /** SQL formatter dialect. Kept separate from the syntax-highlighting dialect because several PG-compatible DBs highlight as MySQL. */
+    formatDialect?: SqlFormatDialect;
   }>(),
   {},
 );
@@ -54,7 +57,7 @@ watch(
     try {
       const schema = props.schema || props.database;
       const ddl = await api.getTableDdl(props.connectionId, props.database, schema, props.tableName);
-      ddlContent.value = ddl;
+      ddlContent.value = await formatSqlForDisplay(ddl, props.formatDialect ?? props.dialect, settingsStore.editorSettings.sqlFormatter);
     } catch (e: any) {
       ddlError.value = e?.message || String(e);
     } finally {
@@ -160,8 +163,8 @@ function retry() {
   const schema = props.schema || props.database;
   api
     .getTableDdl(props.connectionId, props.database, schema, props.tableName)
-    .then((ddl) => {
+    .then(async (ddl) => {
-      ddlContent.value = ddl;
+      ddlContent.value = await formatSqlForDisplay(ddl, props.formatDialect ?? props.dialect, settingsStore.editorSettings.sqlFormatter);
     })
     .catch((e: any) => {
       ddlError.value = e?.message || String(e);

apps/desktop/src/components/objects/ObjectBrowser.vue

@@ -67,7 +67,7 @@ import { useSettingsStore } from "@/stores/settingsStore";
 import { useQueryStore } from "@/stores/queryStore";
 import QueryEditor from "@/components/editor/QueryEditor.vue";
 import DdlViewDialog from "./DdlViewDialog.vue";
-import type { SqlFormatDialect } from "@/lib/sqlFormatter";
+import { formatSqlForDisplay, sqlFormatDialectForDbType, type SqlFormatDialect } from "@/lib/sqlFormatter";
 import { isCancelSearchShortcut } from "@/lib/keyboardShortcuts";
 import { Dialog, DialogContent, DialogFooter, DialogHeader, DialogTitle } from "@/components/ui/dialog";
 import {
@@ -122,6 +122,7 @@ const sourceRow = ref<ObjectBrowserRow | null>(null);
 const sourceEditing = ref(false);
 const effectiveDatabaseType = computed(() => effectiveDatabaseTypeForConnection(props.connection) ?? props.connection.db_type);
 const tableStructureDatabaseType = computed(() => tableStructureDatabaseTypeForConnection(props.connection) ?? props.connection.db_type);
+const sourceEditableText = ref("");
 const sourceDraft = ref("");
 const sourceSaving = ref(false);
 const sourceSaveError = ref("");
@@ -178,25 +179,7 @@ const canOpenDiagram = computed(() => !!props.database && supportsSchemaDiagram(
 const canOpenTableImport = computed(() => !!props.database && supportsTableImport(effectiveDatabaseType.value));
 const supportsTruncateTable = computed(() => supportsTableTruncate(effectiveDatabaseType.value));
 const sourceDialect = computed(() => codeMirrorSqlDialect(effectiveDatabaseType.value));
-const sourceFormatDialect = computed<SqlFormatDialect>(() => {
+const sourceFormatDialect = computed<SqlFormatDialect>(() => sqlFormatDialectForDbType(effectiveDatabaseType.value));
-  switch (effectiveDatabaseType.value) {
-    case "mysql":
-    case "postgres":
-    case "sqlite":
-    case "sqlserver":
-      return effectiveDatabaseType.value;
-    case "rqlite":
-    case "turso":
-      return "sqlite";
-    case "gaussdb":
-    case "kwdb":
-    case "opengauss":
-    case "questdb":
-      return "postgres";
-    default:
-      return "generic";
-  }
-});
 const objectFilters = computed<ObjectFilter[]>(() =>
   (
     [
@@ -425,6 +408,7 @@ async function openSource(row: ObjectBrowserRow) {
   sourceContent.value = "";
   sourceError.value = "";
   sourceEditing.value = false;
+  sourceEditableText.value = "";
   sourceDraft.value = "";
   sourceSaveError.value = "";
   sourceLoading.value = true;
@@ -437,7 +421,8 @@ async function openSource(row: ObjectBrowserRow) {
       name: row.name,
       source: result.source,
     });
-    sourceContent.value = editable;
+    sourceEditableText.value = editable;
+    sourceContent.value = await formatSqlForDisplay(editable, sourceFormatDialect.value, settingsStore.editorSettings.sqlFormatter);
     sourceDraft.value = editable;
     sourceEditing.value = row.type !== "SEQUENCE";
   } catch (e: any) {
@@ -457,8 +442,9 @@ async function openViewDdl(row: ObjectBrowserRow) {
       name: row.name,
       source: result.source,
     });
+    const formatted = await formatSqlForDisplay(ddl, sourceFormatDialect.value, settingsStore.editorSettings.sqlFormatter);
     const tabId = queryStore.createTab(props.connection.id, props.database, `DDL - ${row.name}`);
-    queryStore.updateSql(tabId, ddl);
+    queryStore.updateSql(tabId, formatted);
   } catch (e: any) {
     toast(e?.message || String(e), 5000);
   }
@@ -630,6 +616,7 @@ function closeSource() {
   sourceContent.value = "";
   sourceError.value = "";
   sourceEditing.value = false;
+  sourceEditableText.value = "";
   sourceDraft.value = "";
   sourceSaveError.value = "";
 }
@@ -1040,8 +1027,8 @@ async function copySource() {
 }
 
 function editSource() {
-  if (!sourceRow.value || !sourceContent.value) return;
+  if (!sourceRow.value || !sourceEditableText.value) return;
-  sourceDraft.value = sourceContent.value;
+  sourceDraft.value = sourceEditableText.value;
   sourceSaveError.value = "";
   sourceEditing.value = true;
 }
@@ -1684,7 +1671,7 @@ function getObjectBrowserMenuItems(item: ObjectBrowserRow): ContextMenuItem[] {
     </DialogContent>
   </Dialog>
 
-  <DdlViewDialog v-if="ddlDialogTarget" :connection-id="props.connection.id" :database="props.database" :schema="ddlDialogTarget.schema || selectedSchema" :table-name="ddlDialogTarget.name" :dialect="sourceDialect" v-model:open="showDdlDialog" />
+  <DdlViewDialog v-if="ddlDialogTarget" :connection-id="props.connection.id" :database="props.database" :schema="ddlDialogTarget.schema || selectedSchema" :table-name="ddlDialogTarget.name" :dialect="sourceDialect" :format-dialect="sourceFormatDialect" v-model:open="showDdlDialog" />
 </template>
 
 <style scoped>

apps/desktop/src/components/sidebar/TreeItem.vue

@@ -100,6 +100,7 @@ import {
 import { buildRenameObjectSql, supportsObjectRename, type RenameableObjectType } from "@/lib/objectRenameSql";
 import { buildRoutineRenameObjectSourceStatements, supportsSourceBackedRoutineRename } from "@/lib/objectSourceEditor";
 import { buildViewDdl } from "@/lib/viewDdl";
+import { formatSqlForDisplay, sqlFormatDialectForDbType } from "@/lib/sqlFormatter";
 import DdlViewDialog from "@/components/objects/DdlViewDialog.vue";
 import { getTableStructureCapabilities } from "@/lib/tableStructureCapabilities";
 import { codeMirrorSqlDialect, connectionObjectTreeNodeSchema, connectionObjectTreeQuerySchema, connectionUsesDatabaseObjectTreeMode, effectiveDatabaseTypeForConnection, tableStructureDatabaseTypeForConnection } from "@/lib/jdbcDialect";
@@ -1278,7 +1279,8 @@ async function generateDdlTemplate() {
         source: result.source,
       });
     }
-    openSqlTemplateTab(node.connectionId, node.database, node.schema, ddl, `DDL - ${node.label}`);
+    const formatted = await formatSqlForDisplay(ddl, sqlFormatDialectForDbType(currentDatabaseType()), settingsStore.editorSettings.sqlFormatter);
+    openSqlTemplateTab(node.connectionId, node.database, node.schema, formatted, `DDL - ${node.label}`);
   } catch (e: any) {
     toast(e?.message || String(e), 5000);
   }
@@ -1452,6 +1454,10 @@ const ddlDialect = computed(() => {
   if (!ddlTarget.value?.connectionId) return "mysql";
   return codeMirrorSqlDialect(effectiveDatabaseTypeForConnection(connectionStore.getConfig(ddlTarget.value.connectionId)));
 });
+const ddlFormatDialect = computed(() => {
+  if (!ddlTarget.value?.connectionId) return "generic";
+  return sqlFormatDialectForDbType(effectiveDatabaseTypeForConnection(connectionStore.getConfig(ddlTarget.value.connectionId)));
+});
 const showCreateDatabaseDialog = ref(false);
 const createDatabaseName = ref("");
 const createDatabaseCharset = ref("utf8mb4");
@@ -1619,7 +1625,8 @@ function viewObjectSource() {
     })
     .then(async (result) => {
       const tabId = queryStore.createTab(node.connectionId!, node.database!, `Source - ${node.label}`);
-      queryStore.updateSql(tabId, result.source);
+      const formatted = await formatSqlForDisplay(result.source, sqlFormatDialectForDbType(currentDatabaseType()), settingsStore.editorSettings.sqlFormatter);
+      queryStore.updateSql(tabId, formatted);
       if (objectType !== "SEQUENCE") {
         queryStore.setObjectSource(tabId, {
           schema,
@@ -1653,8 +1660,9 @@ function viewObjectDdl() {
         name: node.label,
         source: result.source,
       });
+      const formatted = await formatSqlForDisplay(ddl, sqlFormatDialectForDbType(effectiveDatabaseTypeForConnection(connection)), settingsStore.editorSettings.sqlFormatter);
       const tabId = queryStore.createTab(node.connectionId!, node.database!, `DDL - ${node.label}`);
-      queryStore.updateSql(tabId, ddl);
+      queryStore.updateSql(tabId, formatted);
     })
     .catch((e: any) => {
       toast(e?.message || String(e), 5000);
@@ -4432,7 +4440,7 @@ function treeItemMenuItems(): ContextMenuItem[] {
 
   <DangerConfirmDialog v-model:open="showDropSchemaConfirm" :title="t('contextMenu.confirmDropSchemaTitle')" :message="t('contextMenu.confirmDropSchemaMessage', { name: node.label })" :sql="dropSchemaPreviewSql" :confirm-label="t('contextMenu.dropSchema')" @confirm="confirmDropSchema" />
 
-  <DdlViewDialog v-if="ddlTarget" :connection-id="ddlTarget.connectionId!" :database="ddlTarget.database!" :schema="ddlTarget.schema" :table-name="ddlTarget.label" :dialect="ddlDialect" v-model:open="showDdlDialog" />
+  <DdlViewDialog v-if="ddlTarget" :connection-id="ddlTarget.connectionId!" :database="ddlTarget.database!" :schema="ddlTarget.schema" :table-name="ddlTarget.label" :dialect="ddlDialect" :format-dialect="ddlFormatDialect" v-model:open="showDdlDialog" />
 </template>
 
 <style>

apps/desktop/src/components/structure/TableStructureEditor.vue

@@ -20,6 +20,7 @@ import { useTheme } from "@/composables/useTheme";
 import { useToast } from "@/composables/useToast";
 import { type SqlHighlighter, createShikiSqlHighlighter } from "@/lib/sqlHighlighter";
 import { copyToClipboard } from "@/lib/clipboard";
+import { formatSqlForDisplay, sqlFormatDialectForDbType } from "@/lib/sqlFormatter";
 import { queryTimeoutSecsForConnection } from "@/lib/queryTimeout";
 import { type EditableStructureColumn, type EditableStructureForeignKey, type EditableStructureIndex, type EditableStructureTrigger } from "@/lib/tableStructureEditorSql";
 import { PRESET_FIELDS_TEMPLATE_ID, createTableColumnTemplateDrafts } from "@/lib/tableColumnTemplates";
@@ -101,7 +102,8 @@ async function fetchDdl() {
   if (!props.connectionId || !props.database || !props.tableName || ddlFetched.value || !tableMetadataCapabilities.value.ddl) return;
   ddlLoading.value = true;
   try {
-    ddlContent.value = await api.getTableDdl(props.connectionId, props.database, metadataSchema.value, props.tableName);
+    const ddl = await api.getTableDdl(props.connectionId, props.database, metadataSchema.value, props.tableName);
+    ddlContent.value = await formatSqlForDisplay(ddl, sqlFormatDialectForDbType(databaseType.value), settingsStore.editorSettings.sqlFormatter);
     ddlFetched.value = true;
   } catch (e: any) {
     ddlContent.value = `-- Error: ${e?.message || e}`;
@@ -794,7 +796,7 @@ async function loadStructure(silent = false, scope: StructureRefreshScope = FULL
       if (databaseType.value === "manticoresearch" && tableMetadataCapabilities.value.ddl) {
         try {
           const ddl = await api.getTableDdl(connectionId, database, schema, tableName);
-          ddlContent.value = ddl;
+          ddlContent.value = await formatSqlForDisplay(ddl, sqlFormatDialectForDbType(databaseType.value), settingsStore.editorSettings.sqlFormatter);
           ddlFetched.value = true;
           nextColumns = applyManticoreDdlColumnExtras(nextColumns, ddl);
         } catch {

apps/desktop/src/lib/__tests__/sqlFormatter.spec.ts

@@ -0,0 +1,30 @@
+import { describe, expect, it } from "vitest";
+import { formatSqlForDisplay, formatSqlText, MAX_SQL_FORMAT_CHARS, sqlFormatDialectForDbType } from "@/lib/sqlFormatter";
+
+describe("sqlFormatter", () => {
+  it("maps PostgreSQL-compatible database types to the postgres formatter dialect", () => {
+    for (const dbType of ["postgres", "kwdb", "gaussdb", "opengauss", "questdb", "kingbase", "highgo", "vastbase", "redshift"]) {
+      expect(sqlFormatDialectForDbType(dbType)).toBe("postgres");
+    }
+  });
+
+  it("maps SQLite-compatible database types to the sqlite formatter dialect", () => {
+    for (const dbType of ["sqlite", "rqlite", "turso"]) {
+      expect(sqlFormatDialectForDbType(dbType)).toBe("sqlite");
+    }
+  });
+
+  it("falls back to the postgres formatter when the generic dialect cannot parse SQL", async () => {
+    const formatted = await formatSqlText("SELECT 1::int AS id;", "generic");
+
+    expect(formatted).toContain("1::int");
+    expect(formatted).toContain("AS id");
+  });
+
+  it("returns the original SQL for display when formatting fails", async () => {
+    const oversizedSql = "x".repeat(MAX_SQL_FORMAT_CHARS + 1);
+
+    await expect(formatSqlText(oversizedSql, "postgres")).rejects.toThrow("SQL is too large to format safely.");
+    await expect(formatSqlForDisplay(oversizedSql, "postgres")).resolves.toBe(oversizedSql);
+  });
+});

apps/desktop/src/lib/sqlFormatter.ts

@@ -4,6 +4,40 @@ export type SqlFormatDialect = "mysql" | "postgres" | "sqlite" | "sqlserver" | "
 
 export const MAX_SQL_FORMAT_CHARS = 1_000_000;
 
+/**
+ * Maps a connection's database type to the SQL-formatter dialect to use.
+ *
+ * Postgres-compatible engines (GaussDB/openGauss/Kingbase/...) reuse the
+ * "postgres" grammar, SQLite-compatible ones reuse "sqlite", and anything
+ * unrecognized falls back to the permissive "generic" dialect. Centralized
+ * here so every surface that formats SQL (editor, object source, DDL viewers)
+ * stays in sync.
+ */
+export function sqlFormatDialectForDbType(dbType: string | null | undefined): SqlFormatDialect {
+  switch (dbType) {
+    case "mysql":
+      return "mysql";
+    case "postgres":
+    case "kwdb":
+    case "gaussdb":
+    case "opengauss":
+    case "questdb":
+    case "kingbase":
+    case "highgo":
+    case "vastbase":
+    case "redshift":
+      return "postgres";
+    case "sqlite":
+    case "rqlite":
+    case "turso":
+      return "sqlite";
+    case "sqlserver":
+      return "sqlserver";
+    default:
+      return "generic";
+  }
+}
+
 function formatterLanguage(dialect: SqlFormatDialect) {
   switch (dialect) {
     case "mysql":
@@ -26,8 +60,40 @@ export async function formatSqlText(sql: string, dialect: SqlFormatDialect = "ge
   }
 
   const { format } = await import("sql-formatter");
-  return format(sql, {
+  const options = sqlFormatterOptions(settings);
-    language: formatterLanguage(dialect),
+  const language = formatterLanguage(dialect);
-    ...sqlFormatterOptions(settings),
+  try {
-  });
+    return format(sql, { language, ...options });
+  } catch (err) {
+    // The generic "sql" dialect can't parse many real-world constructs (PostgreSQL
+    // `::` casts, GaussDB/openGauss materialized-view DDL, T-SQL specifics, ...).
+    // Retry once with the more permissive PostgreSQL grammar, which is a superset
+    // that tolerates most of these, before surfacing the failure.
+    if (language !== "postgresql") {
+      try {
+        return format(sql, { language: "postgresql", ...options });
+      } catch {
+        // fall through to the original error below
+      }
+    }
+    throw err;
+  }
+}
+
+/**
+ * Format SQL for *display* (object source, view/table DDL viewers).
+ *
+ * Unlike `formatSqlText`, this never throws: if the SQL can't be parsed by the
+ * formatter (vendor-specific DDL, oversized input, ...) the original text is
+ * returned unchanged so the viewer still shows the source. Use this for
+ * read-only/auto-format surfaces; use `formatSqlText` where a thrown error
+ * should surface to the user (e.g. the explicit "Format SQL" command).
+ */
+export async function formatSqlForDisplay(sql: string, dialect: SqlFormatDialect = "generic", settings: Partial<SqlFormatterSettings> = DEFAULT_SQL_FORMATTER_SETTINGS): Promise<string> {
+  if (!sql.trim()) return sql;
+  try {
+    return await formatSqlText(sql, dialect, settings);
+  } catch {
+    return sql;
+  }
 }