public function setPrimaryKey($column) : Table
    {
        if (!is_array($column)) {
            $column = [ $column ];
        }
        $this->data['primary'] = $column;
        return $this;
    }
public function setPrimaryKey($column) : Table
    {
        if (!is_array($column)) {
            $column = [ $column ];
        }
        $this->data['primary'] = $column;
        return $this;
    }
public function setPrimaryKey ( $ column ) : Table { if ( ! is_array ( $ column ) ) { $ column = [ $ column ] ; } $ this -> data [ 'primary' ] = $ column ; return $ this ; }
Set the primary key
@param  array|string        $column either a single column name or an array of column names
@return  self
Set the primary key