public function fk($name, $field, $table, $fkField, $delete = 'NO ACTION', $update = 'NO ACTION') {
        $this->foreignKey[$name] = [$field, $table, $fkField, $delete, $update];
        return $this;
    }
public function fk($name, $field, $table, $fkField, $delete = 'NO ACTION', $update = 'NO ACTION') {
        $this->foreignKey[$name] = [$field, $table, $fkField, $delete, $update];
        return $this;
    }
public function fk ( $ name , $ field , $ table , $ fkField , $ delete = 'NO ACTION' , $ update = 'NO ACTION' ) { $ this -> foreignKey [ $ name ] = [ $ field , $ table , $ fkField , $ delete , $ update ] ; return $ this ; }
SET FOREIGN KEY
@param string $name
@param string $field
@param string $table
@param string $fkField
@param string $delete
@param string $update
@return $this
SET FOREIGN KEY