diff --git a/database/gdb/gdb_core_underlying.go b/database/gdb/gdb_core_underlying.go
index a3c177cb6..5f0e669e4 100644
--- a/database/gdb/gdb_core_underlying.go
+++ b/database/gdb/gdb_core_underlying.go
@@ -128,15 +128,6 @@ func (c *Core) DoFilter(ctx context.Context, link Link, sql string, args []inter
 	return sql, args, nil
 }
 
-type sqlParsingHandlerInput struct {
-	DoCommitInput
-	FormattedSql string
-}
-
-type sqlParsingHandlerOutput struct {
-	DoCommitInput
-}
-
 // DoCommit commits current sql and arguments to underlying sql driver.
 func (c *Core) DoCommit(ctx context.Context, in DoCommitInput) (out DoCommitOutput, err error) {
 	// Inject internal data into ctx, especially for transaction creating.
@@ -266,7 +257,7 @@ func (c *Core) DoCommit(ctx context.Context, in DoCommitInput) (out DoCommitOutp
 	if err != nil && err != sql.ErrNoRows {
 		err = gerror.NewCodef(
 			gcode.CodeDbOperationError,
-			"%s, %s\n",
+			"%s, %s",
 			err.Error(),
 			FormatSqlWithArgs(in.Sql, in.Args),
 		)