fix(database/gdb): support OrderRandom feature in different databases (#3794)

database/gdb/gdb.go

@@ -178,6 +178,7 @@ type DB interface {
 	ConvertValueForLocal(ctx context.Context, fieldType string, fieldValue interface{}) (interface{}, error) // See Core.ConvertValueForLocal
 	CheckLocalTypeForField(ctx context.Context, fieldType string, fieldValue interface{}) (LocalType, error) // See Core.CheckLocalTypeForField
 	FormatUpsert(columns []string, list List, option DoInsertOption) (string, error)                         // See Core.DoFormatUpsert
+	OrderRandomFunction() string                                                                             // See Core.OrderRandomFunction
 }
 
 // TX defines the interfaces for ORM transaction operations.

database/gdb/gdb_core_underlying.go

@@ -455,6 +455,11 @@ func (c *Core) RowsToResult(ctx context.Context, rows *sql.Rows) (Result, error)
 	return result, nil
 }
 
+// OrderRandomFunction returns the SQL function for random ordering.
+func (c *Core) OrderRandomFunction() string {
+	return "RAND()"
+}
+
 func (c *Core) columnValueToLocalValue(ctx context.Context, value interface{}, columnType *sql.ColumnType) (interface{}, error) {
 	var scanType = columnType.ScanType()
 	if scanType != nil {

database/gdb/gdb_model_order_group.go

@@ -59,7 +59,7 @@ func (m *Model) OrderDesc(column string) *Model {
 // OrderRandom sets the "ORDER BY RANDOM()" statement for the model.
 func (m *Model) OrderRandom() *Model {
 	model := m.getModel()
-	model.orderBy = "RAND()"
+	model.orderBy = m.db.OrderRandomFunction()
 	return model
 }