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B ��4]� � @ sj d dl mZ ddlmZ ddlmZ ddlmZ ddlmZ G dd� dej�Z G d d � d e�Z d d � Z d S )� )�ARRAY� )�elements)� expression)� functions)�ColumnCollectionConstraintc @ sH e Zd ZdZd Zdd� Zd dd�Zdd� Zej fd d �Z e d d � �Z dS )�aggregate_order_bya� Represent a PostgreSQL aggregate order by expression. E.g.:: from sqlalchemy.dialects.postgresql import aggregate_order_by expr = func.array_agg(aggregate_order_by(table.c.a, table.c.b.desc())) stmt = select([expr]) would represent the expression:: SELECT array_agg(a ORDER BY b DESC) FROM table; Similarly:: expr = func.string_agg( table.c.a, aggregate_order_by(literal_column("','"), table.c.a) ) stmt = select([expr]) Would represent:: SELECT string_agg(a, ',' ORDER BY a) FROM table; .. versionadded:: 1.1 .. versionchanged:: 1.2.13 - the ORDER BY argument may be multiple terms .. seealso:: :class:`.array_agg` c G sX t �|�| _t|�}|dkr&td��n.|dkr@t �|d �| _nt j|dt ji�| _d S )N� z)at least one ORDER BY element is requiredr �_literal_as_text)r Z_literal_as_binds�target�len� TypeError�order_byZ ClauseList)�selfr r Z_lob� r �U/opt/alt/python37/lib64/python3.7/site-packages/sqlalchemy/dialects/postgresql/ext.py�__init__4 s zaggregate_order_by.__init__Nc C s | S )Nr )r Zagainstr r r � self_groupA s z aggregate_order_by.self_groupc K s | j | jfS )N)r r )r �kwargsr r r � get_childrenD s z aggregate_order_by.get_childrenc K s$ || j f|�| _ || jf|�| _d S )N)r r )r �clone�kwr r r �_copy_internalsG s z"aggregate_order_by._copy_internalsc C s | j j| jj S )N)r � _from_objectsr )r r r r r K s z aggregate_order_by._from_objects)N) �__name__� __module__� __qualname__�__doc__�__visit_name__r r r r Z_cloner �propertyr r r r r r s ! r c @ s6 e Zd ZdZdZdZe�ddd�dd� �Zd d � Z dS ) �ExcludeConstraintz�A table-level EXCLUDE constraint. Defines an EXCLUDE constraint as described in the `postgres documentation`__. __ http://www.postgresql.org/docs/9.0/static/sql-createtable.html#SQL-CREATETABLE-EXCLUDE Zexclude_constraintN�wherez:class:`.ExcludeConstraint`z$:paramref:`.ExcludeConstraint.where`c O s� g }g }i | _ t|� \}}xtt| �|�|�D ]`\\}}} } } | dk rN|�| � |dk r\|jn| } | dk rr| | j | < t�|�}|�|| | f� q,W || _tj | f|�|� d�|� d�|� d�d�� |� dd�| _ |� d�} | dk r�tj | d d �| _ dS ) a� Create an :class:`.ExcludeConstraint` object. E.g.:: const = ExcludeConstraint( (Column('period'), '&&'), (Column('group'), '='), where=(Column('group') != 'some group') ) The constraint is normally embedded into the :class:`.Table` construct directly, or added later using :meth:`.append_constraint`:: some_table = Table( 'some_table', metadata, Column('id', Integer, primary_key=True), Column('period', TSRANGE()), Column('group', String) ) some_table.append_constraint( ExcludeConstraint( (some_table.c.period, '&&'), (some_table.c.group, '='), where=some_table.c.group != 'some group', name='some_table_excl_const' ) ) :param \*elements: A sequence of two tuples of the form ``(column, operator)`` where "column" is a SQL expression element or a raw SQL string, most typically a :class:`.Column` object, and "operator" is a string containing the operator to use. In order to specify a column name when a :class:`.Column` object is not available, while ensuring that any necessary quoting rules take effect, an ad-hoc :class:`.Column` or :func:`.sql.expression.column` object should be used. :param name: Optional, the in-database name of this constraint. :param deferrable: Optional bool. If set, emit DEFERRABLE or NOT DEFERRABLE when issuing DDL for this constraint. :param initially: Optional string. If set, emit INITIALLY <value> when issuing DDL for this constraint. :param using: Optional string. If set, emit USING <index_method> when issuing DDL for this constraint. Defaults to 'gist'. :param where: Optional SQL expression construct or literal SQL string. If set, emit WHERE <predicate> when issuing DDL for this constraint. N�name� deferrable� initially)r" r# r$ �usingZgistr! T)Zallow_coercion_to_text)� operators�zipZ"_extract_col_expression_collection�appendr" r Z_literal_as_columnZ _render_exprsr r �getr% r r! )r r r �columnsZ render_exprsZ expressionsr& �expr�columnZstrnameZ add_element�operatorr" r! r r r r ^ s2 D zExcludeConstraint.__init__c sL � fdd�� j �� D �}� j|� j� j� j� j� jd��}|j� � j� |S )Nc s g | ]}|� j | f�qS r )r& )�.0�col)r r r � <listcomp>� s z*ExcludeConstraint.copy.<locals>.<listcomp>)r" r# r$ r! r% ) r* �keys� __class__r" r# r$ r! r% �dispatchZ_update)r r r �cr )r r �copy� s zExcludeConstraint.copy) r r r r r r! r Z_document_text_coercionr r5 r r r r r P s gr c O s t |d< tjj| |�S )z�PostgreSQL-specific form of :class:`.array_agg`, ensures return type is :class:`.postgresql.ARRAY` and not the plain :class:`.types.ARRAY`, unless an explicit ``type_`` is passed. .. versionadded:: 1.1 Z_default_array_type)r r �func� array_agg)�argr r r r r7 � s r7 N) �arrayr Zsqlr r r Z sql.schemar Z ColumnElementr r r7 r r r r �<module> s A