yii\db\SchemaBuilderTrait::primaryKey PHP Method

primaryKey() public method

Creates a primary key column.
Since: 2.0.6
public primaryKey ( integer $length = null ) : ColumnSchemaBuilder
$length integer column size or precision definition. This parameter will be ignored if not supported by the DBMS.
return ColumnSchemaBuilder the column instance which can be further customized.
    public function primaryKey($length = null)
    {
        return $this->getDb()->getSchema()->createColumnSchemaBuilder(Schema::TYPE_PK, $length);
    }