diff --git a/pkg/constant/config.go b/pkg/constant/config.go
index 9a33e40..2e4b94c 100644
--- a/pkg/constant/config.go
+++ b/pkg/constant/config.go
@@ -16,7 +16,11 @@
 
 package constant
 
+import "github.com/cectc/dbpack/third_party/parser/format"
+
 const (
 	ConfigPathKey      = "config"
 	TransactionTimeout = "transaction-timeout"
+
+	DBPackRestoreFormat = format.DefaultRestoreFlags | format.RestoreStringWithoutDefaultCharset
 )
diff --git a/pkg/executor/read_write_splitting.go b/pkg/executor/read_write_splitting.go
index 4333856..6136dc6 100644
--- a/pkg/executor/read_write_splitting.go
+++ b/pkg/executor/read_write_splitting.go
@@ -25,6 +25,7 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/cectc/dbpack/pkg/config"
+	"github.com/cectc/dbpack/pkg/constant"
 	"github.com/cectc/dbpack/pkg/filter"
 	"github.com/cectc/dbpack/pkg/group"
 	"github.com/cectc/dbpack/pkg/log"
@@ -159,9 +160,7 @@ func (executor *ReadWriteSplittingExecutor) ExecutorComQuery(
 
 	connectionID := proto.ConnectionID(spanCtx)
 	queryStmt := proto.QueryStmt(spanCtx)
-	if err := queryStmt.Restore(format.NewRestoreCtx(
-		format.DefaultRestoreFlags|
-			format.RestoreStringWithoutDefaultCharset, &sb)); err != nil {
+	if err := queryStmt.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		return nil, 0, err
 	}
 	newSql := sb.String()
diff --git a/pkg/executor/single_db.go b/pkg/executor/single_db.go
index 148a2a8..45b2afe 100644
--- a/pkg/executor/single_db.go
+++ b/pkg/executor/single_db.go
@@ -25,6 +25,7 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/cectc/dbpack/pkg/config"
+	"github.com/cectc/dbpack/pkg/constant"
 	"github.com/cectc/dbpack/pkg/filter"
 	"github.com/cectc/dbpack/pkg/log"
 	"github.com/cectc/dbpack/pkg/proto"
@@ -154,9 +155,7 @@ func (executor *SingleDBExecutor) ExecutorComQuery(
 	if queryStmt == nil {
 		return nil, 0, errors.New("query stmt should not be nil")
 	}
-	if err := queryStmt.Restore(format.NewRestoreCtx(
-		format.DefaultRestoreFlags|
-			format.RestoreStringWithoutDefaultCharset, &sb)); err != nil {
+	if err := queryStmt.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		return nil, 0, err
 	}
 	sql := sb.String()
diff --git a/pkg/filter/dt/exec/prepare_delete.go b/pkg/filter/dt/exec/prepare_delete.go
index 6946c05..4944c0b 100644
--- a/pkg/filter/dt/exec/prepare_delete.go
+++ b/pkg/filter/dt/exec/prepare_delete.go
@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/cectc/dbpack/pkg/constant"
 	"github.com/cectc/dbpack/pkg/driver"
 	"github.com/cectc/dbpack/pkg/dt/schema"
 	"github.com/cectc/dbpack/pkg/log"
@@ -89,7 +90,7 @@ func (executor *prepareDeleteExecutor) GetTableMeta(ctx context.Context) (schema
 
 func (executor *prepareDeleteExecutor) GetTableName() string {
 	var sb strings.Builder
-	if err := executor.stmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+	if err := executor.stmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		log.Panic(err)
 	}
 	return sb.String()
@@ -115,7 +116,7 @@ func (executor *prepareDeleteExecutor) buildBeforeImageSql(tableMeta schema.Tabl
 
 func (executor *prepareDeleteExecutor) GetWhereCondition() string {
 	var sb strings.Builder
-	if err := executor.stmt.Where.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+	if err := executor.stmt.Where.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		log.Panic(err)
 	}
 	return sb.String()
diff --git a/pkg/filter/dt/exec/prepare_global_lock.go b/pkg/filter/dt/exec/prepare_global_lock.go
index 742b262..7a55b15 100644
--- a/pkg/filter/dt/exec/prepare_global_lock.go
+++ b/pkg/filter/dt/exec/prepare_global_lock.go
@@ -22,6 +22,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/cectc/dbpack/pkg/constant"
 	"github.com/cectc/dbpack/pkg/driver"
 	"github.com/cectc/dbpack/pkg/dt"
 	"github.com/cectc/dbpack/pkg/dt/schema"
@@ -96,11 +97,11 @@ func (executor *prepareGlobalLockExecutor) GetTableMeta(ctx context.Context) (sc
 func (executor *prepareGlobalLockExecutor) GetTableName() string {
 	var sb strings.Builder
 	if executor.isUpdate {
-		if err := executor.updateStmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+		if err := executor.updateStmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 			log.Panic(err)
 		}
 	} else {
-		if err := executor.deleteStmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+		if err := executor.deleteStmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 			log.Panic(err)
 		}
 	}
@@ -148,11 +149,11 @@ func (executor *prepareGlobalLockExecutor) buildBeforeImageSql(tableMeta schema.
 func (executor *prepareGlobalLockExecutor) GetWhereCondition() string {
 	var sb strings.Builder
 	if executor.isUpdate {
-		if err := executor.updateStmt.Where.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+		if err := executor.updateStmt.Where.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 			log.Panic(err)
 		}
 	} else {
-		if err := executor.deleteStmt.Where.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+		if err := executor.deleteStmt.Where.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 			log.Panic(err)
 		}
 	}
diff --git a/pkg/filter/dt/exec/prepare_insert.go b/pkg/filter/dt/exec/prepare_insert.go
index d792d5a..fa79795 100644
--- a/pkg/filter/dt/exec/prepare_insert.go
+++ b/pkg/filter/dt/exec/prepare_insert.go
@@ -22,6 +22,7 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/cectc/dbpack/pkg/constant"
 	"github.com/cectc/dbpack/pkg/driver"
 	"github.com/cectc/dbpack/pkg/dt/schema"
 	"github.com/cectc/dbpack/pkg/log"
@@ -92,7 +93,7 @@ func (executor *prepareInsertExecutor) GetTableMeta(ctx context.Context) (schema
 
 func (executor *prepareInsertExecutor) GetTableName() string {
 	var sb strings.Builder
-	if err := executor.stmt.Table.TableRefs.Left.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+	if err := executor.stmt.Table.TableRefs.Left.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		log.Panic(err)
 	}
 	return sb.String()
diff --git a/pkg/filter/dt/exec/prepare_select_for_update.go b/pkg/filter/dt/exec/prepare_select_for_update.go
index 46df479..fec698b 100644
--- a/pkg/filter/dt/exec/prepare_select_for_update.go
+++ b/pkg/filter/dt/exec/prepare_select_for_update.go
@@ -21,6 +21,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/cectc/dbpack/pkg/constant"
 	"github.com/cectc/dbpack/pkg/tracing"
 
 	"github.com/cectc/dbpack/pkg/driver"
@@ -101,7 +102,7 @@ func (executor *prepareSelectForUpdateExecutor) GetTableMeta(ctx context.Context
 func (executor *prepareSelectForUpdateExecutor) GetTableName() string {
 	var sb strings.Builder
 	table := executor.stmt.From.TableRefs.Left.(*ast.TableSource)
-	if err := table.Source.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+	if err := table.Source.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		log.Panic(err)
 	}
 	return sb.String()
@@ -109,6 +110,6 @@ func (executor *prepareSelectForUpdateExecutor) GetTableName() string {
 
 func (executor *prepareSelectForUpdateExecutor) GetWhereCondition() string {
 	var sb strings.Builder
-	executor.stmt.Where.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb))
+	executor.stmt.Where.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb))
 	return sb.String()
 }
diff --git a/pkg/filter/dt/exec/prepare_update.go b/pkg/filter/dt/exec/prepare_update.go
index 6e7d5c7..2729194 100644
--- a/pkg/filter/dt/exec/prepare_update.go
+++ b/pkg/filter/dt/exec/prepare_update.go
@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/cectc/dbpack/pkg/constant"
 	"github.com/cectc/dbpack/pkg/driver"
 	"github.com/cectc/dbpack/pkg/dt/schema"
 	"github.com/cectc/dbpack/pkg/log"
@@ -113,7 +114,7 @@ func (executor *prepareUpdateExecutor) GetTableMeta(ctx context.Context) (schema
 
 func (executor *prepareUpdateExecutor) GetTableName() string {
 	var sb strings.Builder
-	if err := executor.stmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+	if err := executor.stmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		log.Panic(err)
 	}
 	return sb.String()
@@ -159,7 +160,7 @@ func (executor *prepareUpdateExecutor) buildAfterImageSql(tableMeta schema.Table
 
 func (executor *prepareUpdateExecutor) GetWhereCondition() string {
 	var sb strings.Builder
-	if err := executor.stmt.Where.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+	if err := executor.stmt.Where.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		log.Error(err)
 	}
 	return sb.String()
diff --git a/pkg/filter/dt/exec/query_delete.go b/pkg/filter/dt/exec/query_delete.go
index 0ef70a2..c4e305a 100644
--- a/pkg/filter/dt/exec/query_delete.go
+++ b/pkg/filter/dt/exec/query_delete.go
@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/cectc/dbpack/pkg/constant"
 	"github.com/cectc/dbpack/pkg/driver"
 	"github.com/cectc/dbpack/pkg/dt/schema"
 	"github.com/cectc/dbpack/pkg/log"
@@ -78,7 +79,7 @@ func (executor *queryDeleteExecutor) GetTableMeta(ctx context.Context) (schema.T
 
 func (executor *queryDeleteExecutor) GetTableName() string {
 	var sb strings.Builder
-	if err := executor.stmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+	if err := executor.stmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		log.Panic(err)
 	}
 	return sb.String()
@@ -104,7 +105,7 @@ func (executor *queryDeleteExecutor) buildBeforeImageSql(tableMeta schema.TableM
 
 func (executor *queryDeleteExecutor) GetWhereCondition() string {
 	var sb strings.Builder
-	if err := executor.stmt.Where.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+	if err := executor.stmt.Where.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		log.Panic(err)
 	}
 	return sb.String()
diff --git a/pkg/filter/dt/exec/query_global_lock.go b/pkg/filter/dt/exec/query_global_lock.go
index fe1b75b..b18c8c9 100644
--- a/pkg/filter/dt/exec/query_global_lock.go
+++ b/pkg/filter/dt/exec/query_global_lock.go
@@ -22,6 +22,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/cectc/dbpack/pkg/constant"
 	"github.com/cectc/dbpack/pkg/driver"
 	"github.com/cectc/dbpack/pkg/dt"
 	"github.com/cectc/dbpack/pkg/dt/schema"
@@ -121,11 +122,11 @@ func (executor *queryGlobalLockExecutor) GetTableMeta(ctx context.Context) (sche
 func (executor *queryGlobalLockExecutor) GetTableName() string {
 	var sb strings.Builder
 	if executor.isUpdate {
-		if err := executor.updateStmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+		if err := executor.updateStmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 			log.Panic(err)
 		}
 	} else {
-		if err := executor.deleteStmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+		if err := executor.deleteStmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 			log.Panic(err)
 		}
 	}
@@ -166,11 +167,11 @@ func (executor *queryGlobalLockExecutor) buildBeforeImageSql(tableMeta schema.Ta
 func (executor *queryGlobalLockExecutor) GetWhereCondition() string {
 	var sb strings.Builder
 	if executor.isUpdate {
-		if err := executor.updateStmt.Where.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+		if err := executor.updateStmt.Where.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 			log.Panic(err)
 		}
 	} else {
-		if err := executor.deleteStmt.Where.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+		if err := executor.deleteStmt.Where.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 			log.Panic(err)
 		}
 	}
diff --git a/pkg/filter/dt/exec/query_insert.go b/pkg/filter/dt/exec/query_insert.go
index 90bdd31..6623d9f 100644
--- a/pkg/filter/dt/exec/query_insert.go
+++ b/pkg/filter/dt/exec/query_insert.go
@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/cectc/dbpack/pkg/constant"
 	"github.com/cectc/dbpack/pkg/driver"
 	"github.com/cectc/dbpack/pkg/dt/schema"
 	"github.com/cectc/dbpack/pkg/log"
@@ -124,7 +125,7 @@ func (executor *queryInsertExecutor) GetTableMeta(ctx context.Context) (schema.T
 
 func (executor *queryInsertExecutor) GetTableName() string {
 	var sb strings.Builder
-	if err := executor.stmt.Table.TableRefs.Left.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+	if err := executor.stmt.Table.TableRefs.Left.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		log.Panic(err)
 	}
 	return sb.String()
@@ -137,7 +138,7 @@ func (executor *queryInsertExecutor) getPKValuesByColumn(ctx context.Context) ([
 		for i, value := range executor.stmt.Lists[j] {
 			if i == pkIndex {
 				var sb strings.Builder
-				if err := value.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+				if err := value.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 					log.Panic(err)
 				}
 				pkValues = append(pkValues, sb.String())
diff --git a/pkg/filter/dt/exec/query_select_for_update.go b/pkg/filter/dt/exec/query_select_for_update.go
index e47f0b2..2accf4e 100644
--- a/pkg/filter/dt/exec/query_select_for_update.go
+++ b/pkg/filter/dt/exec/query_select_for_update.go
@@ -21,6 +21,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/cectc/dbpack/pkg/constant"
 	"github.com/cectc/dbpack/pkg/driver"
 	"github.com/cectc/dbpack/pkg/dt"
 	"github.com/cectc/dbpack/pkg/dt/schema"
@@ -97,7 +98,7 @@ func (executor *querySelectForUpdateExecutor) GetTableMeta(ctx context.Context)
 func (executor *querySelectForUpdateExecutor) GetTableName() string {
 	var sb strings.Builder
 	table := executor.stmt.From.TableRefs.Left.(*ast.TableSource)
-	if err := table.Source.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+	if err := table.Source.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		log.Panic(err)
 	}
 	return sb.String()
@@ -105,6 +106,6 @@ func (executor *querySelectForUpdateExecutor) GetTableName() string {
 
 func (executor *querySelectForUpdateExecutor) GetWhereCondition() string {
 	var sb strings.Builder
-	executor.stmt.Where.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb))
+	executor.stmt.Where.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb))
 	return sb.String()
 }
diff --git a/pkg/filter/dt/exec/query_update.go b/pkg/filter/dt/exec/query_update.go
index 5ca665d..c0f5c78 100644
--- a/pkg/filter/dt/exec/query_update.go
+++ b/pkg/filter/dt/exec/query_update.go
@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/cectc/dbpack/pkg/constant"
 	"github.com/cectc/dbpack/pkg/driver"
 	"github.com/cectc/dbpack/pkg/dt/schema"
 	"github.com/cectc/dbpack/pkg/log"
@@ -98,7 +99,7 @@ func (executor *queryUpdateExecutor) GetTableMeta(ctx context.Context) (schema.T
 
 func (executor *queryUpdateExecutor) GetTableName() string {
 	var sb strings.Builder
-	if err := executor.stmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+	if err := executor.stmt.TableRefs.TableRefs.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		log.Panic(err)
 	}
 	return sb.String()
@@ -156,7 +157,7 @@ func (executor *queryUpdateExecutor) buildAfterImageSql(tableMeta schema.TableMe
 
 func (executor *queryUpdateExecutor) GetWhereCondition() string {
 	var sb strings.Builder
-	if err := executor.stmt.Where.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)); err != nil {
+	if err := executor.stmt.Where.Restore(format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)); err != nil {
 		log.Panic(err)
 	}
 	return sb.String()
diff --git a/pkg/misc/sql.go b/pkg/misc/sql.go
index 7be986e..9c6da5d 100644
--- a/pkg/misc/sql.go
+++ b/pkg/misc/sql.go
@@ -53,7 +53,11 @@ func MysqlAppendInParamWithValue(values []interface{}) string {
 	for i, value := range values {
 		switch val := value.(type) {
 		case string:
-			sb.WriteString(fmt.Sprintf("'%s'", val))
+			if strings.HasPrefix(val, "'") {
+				sb.WriteString(fmt.Sprintf("%s", val))
+			} else {
+				sb.WriteString(fmt.Sprintf("'%s'", val))
+			}
 		case []byte:
 			sb.WriteString(fmt.Sprintf("'%s'", val))
 		default:
diff --git a/pkg/misc/sql_test.go b/pkg/misc/sql_test.go
index ecf4dcc..e0db709 100644
--- a/pkg/misc/sql_test.go
+++ b/pkg/misc/sql_test.go
@@ -77,10 +77,14 @@ func TestMysqlAppendInParamWithValue(t *testing.T) {
 		in  []interface{}
 		out string
 	}{
-		"1": {
+		"0": {
 			in:  []interface{}{"abc", "xyz"},
 			out: "('abc','xyz')",
 		},
+		"1": {
+			in:  []interface{}{"'abc'", "'xyz'"},
+			out: "('abc','xyz')",
+		},
 		"2": {
 			in:  []interface{}{[]byte("abc"), []byte("xyz")},
 			out: "('abc','xyz')",
diff --git a/pkg/optimize/optimize_insert.go b/pkg/optimize/optimize_insert.go
index f49e952..140b7d3 100644
--- a/pkg/optimize/optimize_insert.go
+++ b/pkg/optimize/optimize_insert.go
@@ -122,7 +122,7 @@ func getPkValue(ctx context.Context, stmt *ast.InsertStmt, pkIndex int, args []i
 	switch commandType {
 	case constant.ComQuery:
 		var sb strings.Builder
-		ctx := format.NewRestoreCtx(format.DefaultRestoreFlags, &sb)
+		ctx := format.NewRestoreCtx(constant.DBPackRestoreFormat, &sb)
 		if err := stmt.Lists[0][pkIndex].Restore(ctx); err != nil {
 			log.Panic(err)
 		}
diff --git a/pkg/plan/delete.go b/pkg/plan/delete.go
index 9ec5ec9..1f0546f 100644
--- a/pkg/plan/delete.go
+++ b/pkg/plan/delete.go
@@ -103,7 +103,7 @@ func (p *DeletePlan) Execute(ctx context.Context, hints ...*ast.TableOptimizerHi
 }
 
 func (p *DeletePlan) generate(sb *strings.Builder, table string, hints ...*ast.TableOptimizerHint) error {
-	ctx := format.NewRestoreCtx(format.DefaultRestoreFlags|format.RestoreStringWithoutDefaultCharset, sb)
+	ctx := format.NewRestoreCtx(constant.DBPackRestoreFormat, sb)
 	ctx.WriteKeyWord("DELETE ")
 
 	if len(hints) != 0 {
diff --git a/pkg/plan/insert.go b/pkg/plan/insert.go
index bb96879..197f88b 100644
--- a/pkg/plan/insert.go
+++ b/pkg/plan/insert.go
@@ -60,7 +60,7 @@ func (p *InsertPlan) Execute(ctx context.Context, hints ...*ast.TableOptimizerHi
 }
 
 func (p *InsertPlan) generate(sb *strings.Builder) (err error) {
-	ctx := format.NewRestoreCtx(format.DefaultRestoreFlags|format.RestoreStringWithoutDefaultCharset, sb)
+	ctx := format.NewRestoreCtx(constant.DBPackRestoreFormat, sb)
 
 	ctx.WriteKeyWord("INSERT ")
 	ctx.WriteKeyWord("INTO ")
diff --git a/pkg/plan/query.go b/pkg/plan/query.go
index 1ffa117..7ccae8a 100644
--- a/pkg/plan/query.go
+++ b/pkg/plan/query.go
@@ -136,7 +136,7 @@ func (p *QueryOnSingleDBPlan) generate(ctx context.Context, sb *strings.Builder,
 		}
 		sb.WriteString(") t ")
 		if p.Stmt.OrderBy != nil {
-			restoreCtx := format.NewRestoreCtx(format.DefaultRestoreFlags|format.RestoreStringWithoutDefaultCharset, sb)
+			restoreCtx := format.NewRestoreCtx(constant.DBPackRestoreFormat, sb)
 			if err := p.Stmt.OrderBy.Restore(restoreCtx); err != nil {
 				return errors.WithStack(err)
 			}
@@ -240,7 +240,7 @@ func (p *QueryOnMultiDBPlan) Execute(ctx context.Context, _ ...*ast.TableOptimiz
 }
 
 func generateSelect(table string, stmt *ast.SelectStmt, sb *strings.Builder, limit *Limit) error {
-	ctx := format.NewRestoreCtx(format.DefaultRestoreFlags|format.RestoreStringWithoutDefaultCharset, sb)
+	ctx := format.NewRestoreCtx(constant.DBPackRestoreFormat, sb)
 	ctx.WriteKeyWord(stmt.Kind.String())
 	ctx.WritePlain(" ")
 
diff --git a/pkg/plan/update.go b/pkg/plan/update.go
index d6df7c4..993af62 100644
--- a/pkg/plan/update.go
+++ b/pkg/plan/update.go
@@ -103,7 +103,7 @@ func (p *UpdatePlan) Execute(ctx context.Context, hints ...*ast.TableOptimizerHi
 }
 
 func (p *UpdatePlan) generate(sb *strings.Builder, table string, hints ...*ast.TableOptimizerHint) error {
-	ctx := format.NewRestoreCtx(format.DefaultRestoreFlags|format.RestoreStringWithoutDefaultCharset, sb)
+	ctx := format.NewRestoreCtx(constant.DBPackRestoreFormat, sb)
 	ctx.WriteKeyWord("UPDATE ")
 
 	if len(hints) != 0 {