return nil, errors.New("not support")
}

// GetTypeAliases return database type aliases
func (m Migrator) GetTypeAliases(databaseTypeName string) []string {
	return nil
}

// TableType return tableType gorm.TableType and execErr error
func (m Migrator) TableType(dst interface{}) (gorm.TableType, error) {
	return nil, errors.New("not support")

		// close prepared statement, because SavePoint not support prepared statement.
		// e.g. mysql8.0 doc: https://dev.mysql.com/doc/refman/8.0/en/sql-prepared-statements.html
		var (
			preparedStmtTx   *PreparedStmtTX
			isPreparedStmtTx bool
		)
		// close prepared statement, because SavePoint not support prepared statement.

		t.Fatalf("should returns error but got nil")
	}
}

func TestReturningWithNullToZeroValues(t *testing.T) {
	dialect := DB.Dialector.Name()
	switch dialect {
	case "mysql", "sqlserver":
		// these dialects do not support the "returning" clause
		return
	default:
		// This user struct will leverage the existing users table, but override
		// the Name field to default to null.
		type user struct {
			gorm.Model

		t.Fatalf("failed to create from map, got error %v", err)
	}

	var idVal int64
	_, ok := mapValue1["id"].(uint)
	if ok {
		t.Skipf("This test case skipped, because the db supports returning")
	}

	idVal, ok = mapValue1["id"].(int64)
	if !ok {
		t.Fatal("ret result missing id")
	}

	if int64(result1.ID) != idVal {

	}
}

func TestManyToManyPreloadWithMultiPrimaryKeys(t *testing.T) {
	if name := DB.Dialector.Name(); name == "sqlite" || name == "sqlserver" {
		t.Skip("skip sqlite, sqlserver due to it doesn't support multiple primary keys with auto increment")
	}

	type (
		Level1 struct {
			ID           uint   `gorm:"primary_key;"`
			LanguageCode string `gorm:"primary_key"`
			Value        string
		}

//	db.Model(&user).Update("name", "hello")
func (db *DB) Model(value interface{}) (tx *DB) {
	tx = db.getInstance()
	tx.Statement.Model = value
	return
}

// Clauses Add clauses
//
// This supports both standard clauses (clause.OrderBy, clause.Limit, clause.Where) and more
// advanced techniques like specifying lock strength and optimizer hints. See the
// [docs] for more depth.
//
//	// add a simple limit clause

		return ct.NameValue.String
	}
	return ct.SQLColumnType.Name()
}

// DatabaseTypeName returns the database system name of the column type. If an empty
// string is returned, then the driver type name is not supported.
// Consult your driver documentation for a list of driver data types. Length specifiers
// are not included.
// Common type names include "VARCHAR", "TEXT", "NVARCHAR", "DECIMAL", "BOOL",
// "INT", and "BIGINT".

						columnType.Name(), columnType.DatabaseTypeName(), dataType, columnType)
				}
			}
		}
	}
}

func TestTableType(t *testing.T) {
	// currently it is only supported for mysql driver
	if !isMysql() {
		return
	}

	const tblName = "cities"
	const tblSchema = "gorm"
	const tblType = "BASE TABLE"
	const tblComment = "foobar comment"

			t.Fatalf("nested transaction should returns error")
		}

		if err := tx.First(&User{}, "name = ?", user1.Name).Error; err != nil {
			t.Fatalf("Should not rollback record if disabled nested transaction support")
		}

		if err := tx.Transaction(func(tx2 *gorm.DB) error {
			tx2.Create(&user2)

			if err := tx2.First(&User{}, "name = ?", user2.Name).Error; err != nil {
				t.Fatalf("Should find saved record")
			}

	nullTime := sql.NullTime{}
	err := nullTime.Scan(v)
	t.Time = nullTime.Time
	return err
}

func (t EmptyTime) Value() (driver.Value, error) {
	return time.Now() /* pass tests, mysql 8 doesn't support 0000-00-00 by default */, nil
}

type NullString struct {
	sql.NullString
}

type Point struct {
	X, Y int
}

func (point Point) GormDataType() string {
	return "geo"
}