🐛 fix(query-editor): 修复 Oracle 事务提交回滚失败

- 分离 Oracle 托管事务与单次查询执行上下文

- 避免查询结束后取消 BeginTx 上下文导致事务提前回滚

- 补充 sql.ErrTxDone 回归测试覆盖 Oracle 提交路径

internal/app/app.go

@@ -59,6 +59,7 @@ type managedSQLTransaction struct {
 	id          string
 	execer      db.StatementExecer
 	transactor  db.TransactionExecer
+	cancel      context.CancelFunc
 	dbType      string
 	commitSQL   string
 	rollbackSQL string

internal/app/methods_db_multi_test.go

@@ -2,6 +2,7 @@ package app
 
 import (
 	"context"
+	"database/sql"
 	"errors"
 	"testing"
 
@@ -227,22 +228,30 @@ type fakeTransactionalDB struct {
 func (f *fakeTransactionalDB) OpenTransactionExecer(ctx context.Context) (db.TransactionExecer, error) {
 	f.txSession = &fakeTransactionSession{
 		fakeBatchWriteSession: fakeBatchWriteSession{parent: &f.fakeBatchWriteDB},
+		beginCtx:              ctx,
 	}
 	return f.txSession, nil
 }
 
 type fakeTransactionSession struct {
 	fakeBatchWriteSession
+	beginCtx      context.Context
 	commitCalls   int
 	rollbackCalls int
 }
 
 func (s *fakeTransactionSession) Commit() error {
+	if s.beginCtx != nil && s.beginCtx.Err() != nil {
+		return sql.ErrTxDone
+	}
 	s.commitCalls++
 	return nil
 }
 
 func (s *fakeTransactionSession) Rollback() error {
+	if s.beginCtx != nil && s.beginCtx.Err() != nil {
+		return sql.ErrTxDone
+	}
 	s.rollbackCalls++
 	return nil
 }

internal/app/methods_db_transaction.go

@@ -55,11 +55,18 @@ func (a *App) DBQueryMultiTransactional(config connection.ConnectionConfig, dbNa
 	var (
 		sessionExecer        db.StatementExecer
 		transactor           db.TransactionExecer
+		transactionCancel    context.CancelFunc
 		startTextTransaction bool
 	)
 	if provider, ok := dbInst.(db.TransactionExecerProvider); ok {
-		transactionExecer, err := provider.OpenTransactionExecer(ctx)
+		transactionContext := context.Background()
+		if a.ctx != nil {
+			transactionContext = a.ctx
+		}
+		transactionContext, transactionCancel = context.WithCancel(transactionContext)
+		transactionExecer, err := provider.OpenTransactionExecer(transactionContext)
 		if err != nil {
+			transactionCancel()
 			logger.Error(err, "DBQueryMultiTransactional 打开驱动事务失败：%s SQL片段=%q", formatConnSummary(runConfig), sqlSnippet(query))
 			return connection.QueryResult{Success: false, Message: err.Error(), QueryID: queryID}
 		}
@@ -95,6 +102,9 @@ func (a *App) DBQueryMultiTransactional(config connection.ConnectionConfig, dbNa
 			if err := sessionExecer.Close(); err != nil {
 				logger.Warnf("DBQueryMultiTransactional 关闭事务会话失败：%v", err)
 			}
+			if transactionCancel != nil {
+				transactionCancel()
+			}
 		}
 	}()
 
@@ -131,6 +141,7 @@ func (a *App) DBQueryMultiTransactional(config connection.ConnectionConfig, dbNa
 		id:          transactionID,
 		execer:      sessionExecer,
 		transactor:  transactor,
+		cancel:      transactionCancel,
 		dbType:      runConfig.Type,
 		commitSQL:   commitSQL,
 		rollbackSQL: rollbackSQL,
@@ -299,6 +310,9 @@ func (a *App) finishManagedSQLTransaction(transactionID string, commit bool) con
 	if !ok || tx == nil || tx.execer == nil {
 		return connection.QueryResult{Success: false, Message: "事务不存在或已结束"}
 	}
+	if tx.cancel != nil {
+		defer tx.cancel()
+	}
 
 	action := "回滚"
 	sqlText := tx.rollbackSQL
@@ -359,6 +373,9 @@ func (a *App) rollbackPendingSQLTransactionsOnShutdown() {
 			}
 		}
 		cancel()
+		if tx.cancel != nil {
+			tx.cancel()
+		}
 		if tx.execer != nil {
 			if err := tx.execer.Close(); err != nil {
 				logger.Warnf("关闭应用时关闭 SQL 编辑器事务会话失败：id=%s dbType=%s err=%v", tx.id, tx.dbType, err)