🐛 fix(db): 修复达梦读查询结果空页

- 统一按解析后的驱动类型判断只读查询结果策略

- 达梦及 dm/dm8 自定义驱动只读查询优先走普通 Query

- 补充事务执行路径与达梦结果集回归测试

internal/app/methods_db.go

@@ -998,6 +998,7 @@ func (a *App) DBQueryMulti(config connection.ConnectionConfig, dbName string, qu
 	}()
 
 	runConfig := normalizeRunConfig(config, dbName)
+	resolvedDBType := resolveDDLDBType(runConfig)
 	buildStatementExecutionFailedMessage := func(index int, err error, previousSuccessCount int) string {
 		message := a.appText("db.backend.error.multi_statement_execution_failed", map[string]any{
 			"index":  index,
@@ -1059,7 +1060,7 @@ func (a *App) DBQueryMulti(config connection.ConnectionConfig, dbName string, qu
 			break
 		}
 	}
-	useNativeMultiResult := shouldUseNativeMultiResultBatch(runConfig.Type, statements, allReadOnly)
+	useNativeMultiResult := shouldUseNativeMultiResultBatch(resolvedDBType, statements, allReadOnly)
 
 	runMultiQuery := func(inst db.Database) ([]connection.ResultSetData, []string, error) {
 		if !useNativeMultiResult {
@@ -1226,7 +1227,7 @@ func (a *App) DBQueryMulti(config connection.ConnectionConfig, dbName string, qu
 		isReadStmt := isReadOnlySQLQuery(runConfig.Type, stmt)
 		tryQueryStmtFirst := shouldTryQueryResultFirst(runConfig.Type, stmt)
 		if isReadStmt || tryQueryStmtFirst {
-			preferPlainReadQuery := isReadStmt && shouldPreferPlainReadQueryResult(runConfig.Type)
+			preferPlainReadQuery := isReadStmt && shouldPreferPlainReadQueryResult(resolvedDBType)
 			var (
 				data             []map[string]interface{}
 				columns          []string
@@ -1417,8 +1418,13 @@ func shouldUseNativeMultiResultBatch(dbType string, statements []string, allRead
 }
 
 func shouldPreferPlainReadQueryResult(dbType string) bool {
-	switch resolveDDLDBType(connection.ConnectionConfig{Type: dbType}) {
-	case "postgres", "kingbase", "highgo", "vastbase", "opengauss", "gaussdb":
+	switch strings.ToLower(strings.TrimSpace(dbType)) {
+	case "postgres", "postgresql",
+		"kingbase", "kingbase8", "kingbasees", "kingbasev8",
+		"highgo", "vastbase",
+		"opengauss", "open_gauss", "open-gauss",
+		"gaussdb", "gauss_db", "gauss-db",
+		"dameng", "dm", "dm8":
 		return true
 	default:
 		return false

internal/app/methods_db_multi_test.go

@@ -1878,6 +1878,67 @@ func TestDBQueryMultiPrefersPlainQueryForKingbaseReadResults(t *testing.T) {
 	}
 }
 
+func TestDBQueryMultiPrefersPlainQueryForDamengReadResults(t *testing.T) {
+	originalNewDatabaseFunc := newDatabaseFunc
+	t.Cleanup(func() {
+		newDatabaseFunc = originalNewDatabaseFunc
+	})
+
+	query := "SELECT * FROM PUB_TIMER"
+	nativeEmptyRowsResult := []connection.ResultSetData{{
+		Rows:    []map[string]interface{}{},
+		Columns: []string{"ID", "NAME"},
+	}}
+	baseDB := &fakeBatchWriteDB{
+		queryMap: map[string][]map[string]interface{}{
+			query: {
+				{"ID": 1, "NAME": "timer_a"},
+			},
+		},
+		fieldMap: map[string][]string{
+			query: {"ID", "NAME"},
+		},
+		multiResult: map[string][]connection.ResultSetData{
+			query: nativeEmptyRowsResult,
+		},
+		queryErr: map[string]error{},
+	}
+	fakeDB := &fakeNativeMultiResultDB{fakeBatchWriteDB: baseDB}
+	newDatabaseFunc = func(dbType string) (db.Database, error) {
+		return fakeDB, nil
+	}
+
+	app := NewAppWithSecretStore(secretstore.NewUnavailableStore("test"))
+	config := connection.ConnectionConfig{Type: "custom", Driver: "dm8", Host: "127.0.0.1", Port: 5236, User: "SYSDBA"}
+
+	result := app.DBQueryMulti(config, "SYSDBA", query, "dameng-plain-query-result-test")
+	if !result.Success {
+		t.Fatalf("expected DBQueryMulti success, got failure: %s", result.Message)
+	}
+	if fakeDB.multiCalls != 0 {
+		t.Fatalf("expected dameng read query to skip top-level native multi-result path, got %d calls", fakeDB.multiCalls)
+	}
+	if baseDB.session == nil {
+		t.Fatal("expected DBQueryMulti to open a pinned session for dameng read query")
+	}
+	if baseDB.session.queryCalls != 1 {
+		t.Fatalf("expected dameng read query to use plain session query once, got %d calls", baseDB.session.queryCalls)
+	}
+	resultSets, ok := result.Data.([]connection.ResultSetData)
+	if !ok {
+		t.Fatalf("expected []connection.ResultSetData, got %T", result.Data)
+	}
+	if len(resultSets) != 1 {
+		t.Fatalf("expected one result set, got %#v", resultSets)
+	}
+	if !reflect.DeepEqual(resultSets[0].Columns, []string{"ID", "NAME"}) {
+		t.Fatalf("expected plain query columns, got %#v", resultSets[0].Columns)
+	}
+	if got := resultSets[0].Rows[0]["NAME"]; got != "timer_a" {
+		t.Fatalf("expected plain query SELECT result NAME=timer_a, got %#v", got)
+	}
+}
+
 func TestDBQueryMultiUsesPinnedSessionForSequentialFallback(t *testing.T) {
 	originalNewDatabaseFunc := newDatabaseFunc
 	t.Cleanup(func() {
@@ -2265,3 +2326,48 @@ func TestDBQueryMultiTransactionalTreatsSelectIntoAsManagedWrite(t *testing.T) {
 		}
 	}
 }
+
+func TestExecuteManagedSQLTransactionStatementsPrefersPlainQueryForDamengReadResults(t *testing.T) {
+	query := "SELECT * FROM PUB_TIMER"
+	baseDB := &fakeBatchWriteDB{
+		queryMap: map[string][]map[string]interface{}{
+			query: {
+				{"ID": 1, "NAME": "timer_a"},
+			},
+		},
+		fieldMap: map[string][]string{
+			query: {"ID", "NAME"},
+		},
+		multiResult: map[string][]connection.ResultSetData{
+			query: {{
+				Rows:    []map[string]interface{}{},
+				Columns: []string{"ID", "NAME"},
+			}},
+		},
+		queryErr: map[string]error{},
+	}
+	session := &fakeBatchWriteSession{parent: baseDB}
+
+	results, err := executeManagedSQLTransactionStatements(
+		context.Background(),
+		session,
+		connection.ConnectionConfig{Type: "custom", Driver: "dm8"},
+		[]string{query},
+		nil,
+	)
+	if err != nil {
+		t.Fatalf("expected executeManagedSQLTransactionStatements success, got %v", err)
+	}
+	if session.queryCalls != 1 {
+		t.Fatalf("expected dameng managed read query to use plain query once, got %d calls", session.queryCalls)
+	}
+	if len(results) != 1 {
+		t.Fatalf("expected one result set, got %#v", results)
+	}
+	if !reflect.DeepEqual(results[0].Columns, []string{"ID", "NAME"}) {
+		t.Fatalf("expected plain query columns, got %#v", results[0].Columns)
+	}
+	if got := results[0].Rows[0]["NAME"]; got != "timer_a" {
+		t.Fatalf("expected plain query SELECT result NAME=timer_a, got %#v", got)
+	}
+}

internal/app/methods_db_transaction.go

@@ -265,6 +265,7 @@ func executeManagedSQLTransactionStatements(ctx context.Context, session db.Stat
 	if text == nil {
 		text = defaultDBBackendText
 	}
+	resolvedDBType := resolveDDLDBType(runConfig)
 	buildStatementExecutionFailedError := func(index int, err error) error {
 		return fmt.Errorf("%s", text("db.backend.error.multi_statement_execution_failed", map[string]any{
 			"index":  index,
@@ -298,7 +299,15 @@ func executeManagedSQLTransactionStatements(ctx context.Context, session db.Stat
 				usedMultiResult  bool
 				err              error
 			)
-			if sessionMultiQueryMessageTarget != nil {
+			if isReadStmt && shouldPreferPlainReadQueryResult(resolvedDBType) {
+				if sessionQueryMessageTarget != nil {
+					data, columns, messages, err = sessionQueryMessageTarget.QueryContextWithMessages(ctx, stmt)
+				} else if sessionQueryTarget != nil {
+					data, columns, err = sessionQueryTarget.QueryContext(ctx, stmt)
+				} else {
+					err = buildTransactionQueryUnsupportedError()
+				}
+			} else if sessionMultiQueryMessageTarget != nil {
 				statementResults, messages, err = sessionMultiQueryMessageTarget.QueryMultiContextWithMessages(ctx, stmt)
 				usedMultiResult = true
 			} else if sessionMultiQueryTarget != nil {