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편집 파일: hstore.cpython-38.pyc
U -?�f- � @ sZ d dl Z ddlmZ ddlmZ ddlmZ ddlmZ ddlmZ ddlmZ dd lm Z d d l m Z d d l mZ d ZG dd� de je je j�ZG dd� dej�ZG dd� dej�ZG dd� dej�ZG dd� dej�ZG dd� dej�ZG dd� dej�ZG d d � d ej�Z G d d � d ej�Z e � d e j �Z e � d!e j �Z!d"d#� Z"d$d%� Z#d&d'� Z$dS )(� N� )�ARRAY)� CONTAINED_BY)�CONTAINS)�GETITEM)�HAS_ALL)�HAS_ANY)�HAS_KEY� )�types)� functions)�HSTORE�hstorec @ sX e Zd ZdZd ZdZe�� Zd dd�Z G dd� dej j ej j �Z e Z dd � Zd d � ZdS ) r a% Represent the PostgreSQL HSTORE type. The :class:`.HSTORE` type stores dictionaries containing strings, e.g.:: data_table = Table('data_table', metadata, Column('id', Integer, primary_key=True), Column('data', HSTORE) ) with engine.connect() as conn: conn.execute( data_table.insert(), data = {"key1": "value1", "key2": "value2"} ) :class:`.HSTORE` provides for a wide range of operations, including: * Index operations:: data_table.c.data['some key'] == 'some value' * Containment operations:: data_table.c.data.has_key('some key') data_table.c.data.has_all(['one', 'two', 'three']) * Concatenation:: data_table.c.data + {"k1": "v1"} For a full list of special methods see :class:`.HSTORE.comparator_factory`. .. container:: topic **Detecting Changes in HSTORE columns when using the ORM** For usage with the SQLAlchemy ORM, it may be desirable to combine the usage of :class:`.HSTORE` with :class:`.MutableDict` dictionary now part of the :mod:`sqlalchemy.ext.mutable` extension. This extension will allow "in-place" changes to the dictionary, e.g. addition of new keys or replacement/removal of existing keys to/from the current dictionary, to produce events which will be detected by the unit of work:: from sqlalchemy.ext.mutable import MutableDict class MyClass(Base): __tablename__ = 'data_table' id = Column(Integer, primary_key=True) data = Column(MutableDict.as_mutable(HSTORE)) my_object = session.query(MyClass).one() # in-place mutation, requires Mutable extension # in order for the ORM to detect my_object.data['some_key'] = 'some value' session.commit() When the :mod:`sqlalchemy.ext.mutable` extension is not used, the ORM will not be alerted to any changes to the contents of an existing dictionary, unless that dictionary value is re-assigned to the HSTORE-attribute itself, thus generating a change event. .. seealso:: :class:`.hstore` - render the PostgreSQL ``hstore()`` function. FNc C s |dk r|| _ dS )z�Construct a new :class:`.HSTORE`. :param text_type: the type that should be used for indexed values. Defaults to :class:`_types.Text`. N)� text_type)�selfr � r �U/opt/hc_python/lib64/python3.8/site-packages/sqlalchemy/dialects/postgresql/hstore.py�__init__i s zHSTORE.__init__c @ sx e Zd ZdZdd� Zdd� Zdd� Zdd � Zd d � Zd d � Z dd� Z dd� Z dd� Z dd� Z dd� Zdd� Zdd� Zd S ) zHSTORE.Comparatorz2Define comparison operations for :class:`.HSTORE`.c C s | j t|tjd�S )zvBoolean expression. Test for presence of a key. Note that the key may be a SQLA expression. �Z result_type)�operater �sqltypes�Boolean�r �otherr r r �has_keyx s zHSTORE.Comparator.has_keyc C s | j t|tjd�S )z;Boolean expression. Test for presence of all keys in jsonbr )r r r r r r r r �has_all~ s zHSTORE.Comparator.has_allc C s | j t|tjd�S )z:Boolean expression. Test for presence of any key in jsonbr )r r r r r r r r �has_any� s zHSTORE.Comparator.has_anyc K s | j t|tjd�S )z�Boolean expression. Test if keys (or array) are a superset of/contained the keys of the argument jsonb expression. kwargs may be ignored by this operator but are required for API conformance. r )r r r r )r r �kwargsr r r �contains� s zHSTORE.Comparator.containsc C s | j t|tjd�S )z|Boolean expression. Test if keys are a proper subset of the keys of the argument jsonb expression. r )r r r r r r r r � contained_by� s �z HSTORE.Comparator.contained_byc C s t || jjfS �N)r �typer )r �indexr r r �_setup_getitem� s z HSTORE.Comparator._setup_getitemc C s t | j|�S )z�Boolean expression. Test for presence of a non-NULL value for the key. Note that the key may be a SQLA expression. )�_HStoreDefinedFunction�expr�r �keyr r r �defined� s zHSTORE.Comparator.definedc C s t |t�rt|�}t| j|�S )z�HStore expression. Returns the contents of this hstore with the given key deleted. Note that the key may be a SQLA expression. )� isinstance�dict�_serialize_hstore�_HStoreDeleteFunctionr% r& r r r �delete� s zHSTORE.Comparator.deletec C s t | j|�S )zdHStore expression. Returns a subset of an hstore defined by array of keys. )�_HStoreSliceFunctionr% )r �arrayr r r �slice� s zHSTORE.Comparator.slicec C s t | j�S )z.Text array expression. Returns array of keys.)�_HStoreKeysFunctionr% �r r r r �keys� s zHSTORE.Comparator.keysc C s t | j�S )z0Text array expression. Returns array of values.)�_HStoreValsFunctionr% r2 r r r �vals� s zHSTORE.Comparator.valsc C s t | j�S )z^Text array expression. Returns array of alternating keys and values. )�_HStoreArrayFunctionr% r2 r r r r/ � s zHSTORE.Comparator.arrayc C s t | j�S )z<Text array expression. Returns array of [key, value] pairs.)�_HStoreMatrixFunctionr% r2 r r r �matrix� s zHSTORE.Comparator.matrixN)�__name__� __module__� __qualname__�__doc__r r r r r r# r( r- r0 r3 r5 r/ r8 r r r r � Comparators s r= c C s dd� }|S )Nc S s t | t�rt| �S | S d S r )r) r* r+ ��valuer r r �process� s z&HSTORE.bind_processor.<locals>.processr )r �dialectr@ r r r �bind_processor� s zHSTORE.bind_processorc C s dd� }|S )Nc S s | d k rt | �S | S d S r )� _parse_hstorer> r r r r@ � s z(HSTORE.result_processor.<locals>.processr )r rA Zcoltyper@ r r r �result_processor� s zHSTORE.result_processor)N)r9 r: r; r< Z__visit_name__Zhashabler �Textr r � Indexabler= � ConcatenableZcomparator_factoryrB rD r r r r r s J �M r c @ s e Zd ZdZeZd ZdZdS )r aG Construct an hstore value within a SQL expression using the PostgreSQL ``hstore()`` function. The :class:`.hstore` function accepts one or two arguments as described in the PostgreSQL documentation. E.g.:: from sqlalchemy.dialects.postgresql import array, hstore select(hstore('key1', 'value1')) select( hstore( array(['key1', 'key2', 'key3']), array(['value1', 'value2', 'value3']) ) ) .. seealso:: :class:`.HSTORE` - the PostgreSQL ``HSTORE`` datatype. 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Attempts to approximate PG's hstore input parsing rules as closely as possible. Although currently this is not strictly necessary, since the current implementation of hstore's output syntax is stricter than what it accepts as input, the documentation makes no guarantees that will always be the case. r Nr' �\"�"�\\�\Z value_nullr? ) �HSTORE_PAIR_RE�match�group�replace�end�HSTORE_DELIMITER_RErN � ValueErrorrT )rQ �resultrR Z pair_matchr' r? Z delim_matchr r r rC Q s0 � �� rC c s$ dd� � d� � fdd�| �� D ��S )zxSerialize a dictionary into an hstore literal. Keys and values must both be strings (except None for values). c S sJ |dkr| d krdS t | t�r6d| �dd��dd� S td| |f ��d S ) Nr? ZNULLz"%s"rX rW rV rU z"%r in %s position is not a string.)r) �strr\ r_ )�s�positionr r r �esc� s �z _serialize_hstore.<locals>.escz, c 3 s* | ]"\}}d � |d�� |d�f V qdS )z%s=>%sr' r? 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