Edit File: baked.cpython-37.pyc
B ��4]�S � @ s< d Z ddlZddlZddlmZ ddlmZ ddlmZ ddlm Z ddl m Z ddl m Z dd lmZ dd lmZ ddlmZ e�e�ZG d d � d e�ZG d d� de�ZG dd� de�Ze�dd�dd� �Ze�dd�dd� �Ze � � dd� �Z e j e�dd�dd� ��Z e j e�dd�dd � ��Z e j!Z e j"Z ej#Z#dS ) z�Baked query extension. Provides a creational pattern for the :class:`.query.Query` object which allows the fully constructed object, Core select statement, and string compiled result to be fully cached. � N� )�exc)�util)�strategy_options)�Query)�Session)�func)�literal_columnc @ s$ e Zd ZdZdZdd� Zdd� ZdS )�Bakeryz�Callable which returns a :class:`.BakedQuery`. This object is returned by the class method :meth:`.BakedQuery.bakery`. It exists as an object so that the "cache" can be easily inspected. .. versionadded:: 1.2 )�cls�cachec C s || _ || _d S )N)r r )�selfZcls_r � r �G/opt/alt/python37/lib64/python3.7/site-packages/sqlalchemy/ext/baked.py�__init__/ s zBakery.__init__c G s | � | j||�S )N)r r )r � initial_fn�argsr r r �__call__3 s zBakery.__call__N)�__name__� __module__� __qualname__�__doc__� __slots__r r r r r r r ! s r c @ s� e Zd ZdZdZd/dd�Zed0dd ��Zd d � Zd1d d �Z dd� Z dd� Z dd� Z dd� Z dd� Zdd� Zd2dd �Zd d � Zd3d d �Zd4d!d"�Zd#d$� Zd%d&� Zd'd(� Zd)d*� Zd+d,� Zd-d.� ZdS )5� BakedQueryz3A builder object for :class:`.query.Query` objects.)�steps�_bakery� _cache_key�_spoiledr c C s* d| _ | �||� |g| _d| _|| _d S )Nr F)r �_update_cache_keyr r r )r �bakeryr r r r r r < s zBakedQuery.__init__�� Nc C s t | tj||d��S )zSConstruct a new bakery. :return: an instance of :class:`.Bakery` )Z size_alert)r r ZLRUCache)r �sizeZ _size_alertr r r r C s zBakedQuery.bakeryc C s2 t �t �}| j|_t| j�|_| j|_| j|_|S )N)r �__new__r �listr r r )r Zb1r r r �_cloneM s zBakedQuery._clonec C s | j |jf| 7 _ d S )N)r �__code__)r �fnr r r r r U s z BakedQuery._update_cache_keyc C s$ t |t�r| j|� n | �|� | S )N)� isinstance�tuple� add_criteria)r �otherr r r �__iadd__X s zBakedQuery.__iadd__c C s" t |t�r| j|� S | �|�S d S )N)r' r( � with_criteria)r r* r r r �__add___ s zBakedQuery.__add__c G s | � ||� | j�|� | S )z�Add a criteria function to this :class:`.BakedQuery`. This is equivalent to using the ``+=`` operator to modify a :class:`.BakedQuery` in-place. )r r �append)r r& r r r r r) e s zBakedQuery.add_criteriac G s | � � j|f|�� S )z�Add a criteria function to a :class:`.BakedQuery` cloned from this one. This is equivalent to using the ``+`` operator to produce a new :class:`.BakedQuery` with modifications. )r$ r) )r r& r r r r r, p s zBakedQuery.with_criteriac C s t | |�S )z�Return a :class:`.Result` object for this :class:`.BakedQuery`. This is equivalent to calling the :class:`.BakedQuery` as a Python callable, e.g. ``result = my_baked_query(session)``. )�Result)r �sessionr r r � for_sessiony s zBakedQuery.for_sessionc C s | � |�S )N)r1 )r r0 r r r r � s zBakedQuery.__call__Fc C s4 |s*| j s*| �� }| jd7 _|jg| _d| _ | S )az Cancel any query caching that will occur on this BakedQuery object. The BakedQuery can continue to be used normally, however additional creational functions will not be cached; they will be called on every invocation. This is to support the case where a particular step in constructing a baked query disqualifies the query from being cacheable, such as a variant that relies upon some uncacheable value. :param full: if False, only functions added to this :class:`.BakedQuery` object subsequent to the spoil step will be non-cached; the state of the :class:`.BakedQuery` up until this point will be pulled from the cache. If True, then the entire :class:`.Query` object is built from scratch each time, with all creational functions being called on each invocation. )Z _query_onlyT)r r$ r �_retrieve_baked_queryr )r �fullZ _spoil_pointr r r �spoil� s zBakedQuery.spoilc C s | j |jf S )a� Return the key that actually goes into the cache dictionary for this :class:`.BakedQuery`, taking into account the given :class:`.Session`. This basically means we also will include the session's query_class, as the actual :class:`.Query` object is part of what's cached and needs to match the type of :class:`.Query` that a later session will want to use. )r Z _query_cls)r r0 r r r �_effective_key� s zBakedQuery._effective_keyc C s | � � }|j|||d� |S )z2Cloning version of _add_lazyload_options. )� cache_path)r$ �_add_lazyload_options)r �options�effective_pathr6 �qr r r �_with_lazyload_options� s z!BakedQuery._with_lazyload_optionsc sz d}|s � }|j d jr"| �� n:x8�D ]0}|�|�}|dkrH| �� q(|dk r(||7 }q(W | �� �fdd�|j |� dS )a* Used by per-state lazy loaders to add options to the "lazy load" query from a parent query. Creates a cache key based on given load path and query options; if a repeatable cache key cannot be generated, the query is "spoiled" so that it won't use caching. r r FNc s | � � �j�� S )N)Z_with_current_pathZ_conditional_options)r: )r9 r8 r r �<lambda>� s z2BakedQuery._add_lazyload_options.<locals>.<lambda>)�pathZis_aliased_classr4 Z_generate_cache_keyr) )r r8 r9 r6 �key�opt� cache_keyr )r9 r8 r r7 � s z BakedQuery._add_lazyload_optionsc C sF | j �| �|�d �}|d kr<| �|�}|�d �| j | �|�< |�|�S )N)r �getr5 � _as_query� with_session)r r0 �queryr r r r2 � s z BakedQuery._retrieve_baked_queryc C sz | � |�}|�� }| �||� d |_|j�d � |_}|j�d| ji�|_xdD ]}|j � |d � qPW || j| � |�< |S )NZcompiled_cache)Z _correlateZ _from_objZ_mapper_adapter_mapZ _joinpathZ _joinpoint) rB Z_compile_context�_bake_subquery_loadersr0 rD rC Z_execution_options�unionr �__dict__�popr5 )r r0 rD �context�attrr r r �_bake� s zBakedQuery._bakec C sN t |t�r|}n4t |t�r4|j}|dkrDt�d��ntdt|� ��| �|�S )a# Return the :class:`.Query` object for use as a subquery. This method should be used within the lambda callable being used to generate a step of an enclosing :class:`.BakedQuery`. The parameter should normally be the :class:`.Query` object that is passed to the lambda:: sub_bq = self.bakery(lambda s: s.query(User.name)) sub_bq += lambda q: q.filter( User.id == Address.user_id).correlate(Address) main_bq = self.bakery(lambda s: s.query(Address)) main_bq += lambda q: q.filter( sub_bq.to_query(q).exists()) In the case where the subquery is used in the first callable against a :class:`.Session`, the :class:`.Session` is also accepted:: sub_bq = self.bakery(lambda s: s.query(User.name)) sub_bq += lambda q: q.filter( User.id == Address.user_id).correlate(Address) main_bq = self.bakery( lambda s: s.query(Address.id, sub_bq.to_query(q).as_scalar()) ) :param query_or_session: a :class:`.Query` object or a class :class:`.Session` object, that is assumed to be within the context of an enclosing :class:`.BakedQuery` callable. .. versionadded:: 1.3 Nz1Given Query needs to be associated with a Sessionz)Query or Session object expected, got %r.) r' r r r0 �sa_exc� ArgumentError� TypeError�typerB )r Zquery_or_sessionr0 r r r �to_query� s % zBakedQuery.to_queryc C s2 | j d |�}x | j dd � D ] }||�}q W |S )Nr � )r )r r0 rD �stepr r r rB , s zBakedQuery._as_queryc s� g |j d< }xpt|j �� �D ]^\}� t� t�r d|krtt| j� fdd��}| j| |_|�|� |� ||j� f� |j |= q W dS )ab convert subquery eager loaders in the cache into baked queries. For subquery eager loading to work, all we need here is that the Query point to the correct session when it is run. However, since we are "baking" anyway, we may as well also turn the query into a "baked" query so that we save on performance too. � baked_queriesZsubqueryc s � S )Nr )r )�vr r r< @ � z3BakedQuery._bake_subquery_loaders.<locals>.<lambda>N) � attributesr# �itemsr' r r r r rK r. )r r0 rI rS �k�bkr )rT r rE 3 s z!BakedQuery._bake_subquery_loadersc C sl xf|j d D ]X\}}}t| j|fdd��}||_|�|�} x|D ]} | �| �} q@W | jf |�|j |< q W dS )z�Retrieve subquery eager loaders stored by _bake_subquery_loaders and turn them back into Result objects that will iterate just like a Query object. rS c S s |� | �S )N)rC )Zsessr: r r r r< P rU z5BakedQuery._unbake_subquery_loaders.<locals>.<lambda>N)rV r r r r1 �with_post_criteria�params) r r0 rI r[ Z post_criteriarX r@ rD rY r: r& r r r �_unbake_subquery_loadersF s z#BakedQuery._unbake_subquery_loaders)r )r N)r )F)N)N)r r r r r r � classmethodr r$ r r+ r- r) r, r1 r r4 r5 r; r7 r2 rK rP rB rE r\ r r r r r 7 s. # 4r c @ s� e Zd ZdZdZdd� Zdd� Zdd� Zd d � Zd d � Z d d� Z dd� Z dd� Z dd� Z dd� Zdd� Zdd� Zdd � Zd d � Zd d � Zd!S )"r/ a Invokes a :class:`.BakedQuery` against a :class:`.Session`. The :class:`.Result` object is where the actual :class:`.query.Query` object gets created, or retrieved from the cache, against a target :class:`.Session`, and is then invoked for results. )�bqr0 �_params�_post_criteriac C s || _ || _i | _g | _d S )N)r^ r0 r_ r` )r r^ r0 r r r r d s zResult.__init__c O sB t |�dkr |�|d � nt |�dkr2t�d��| j�|� | S )z@Specify parameters to be replaced into the string SQL statement.rQ r zFparams() takes zero or one positional argument, which is a dictionary.)�len�updaterL rM r_ )r r �kwr r r r[ j s z Result.paramsc C s |r| j �|� | S )N)r` �extend)r �fnsr r r �_using_post_criteriaw s zResult._using_post_criteriac C s | � |g�S )a Add a criteria function that will be applied post-cache. This adds a function that will be run against the :class:`.Query` object after it is retrieved from the cache. Functions here can be used to alter the query in ways that **do not affect the SQL output**, such as execution options and shard identifiers (when using a shard-enabled query object) .. warning:: :meth:`.Result.with_post_criteria` functions are applied to the :class:`.Query` object **after** the query's SQL statement object has been retrieved from the cache. Any operations here which intend to modify the SQL should ensure that :meth:`.BakedQuery.spoil` was called first. .. versionadded:: 1.2 )rf )r r& r r r rZ | s zResult.with_post_criteriac C s2 | j �| j��| j�}x| jD ] }||�}q W |S )N)r^ rB r0 r[ r_ r` )r r: r& r r r rB � s zResult._as_queryc C s t | �� �S )N)�strrB )r r r r �__str__� s zResult.__str__c C s� | j }| jjr|jr t| �� �S |j�|�| j�d �}|d krJ|� | j�}t � |�}| j|_|j � � |_ |� | j|| j | j� d|j_|jr�|js�| j�� |j�| j ��| j�}x| jD ] }||�}q�W |�|�S )NT)r^ r0 Zenable_baked_queriesr �iterrB r rA r5 rK �copyrV r\ r_ r` � statementZ use_labelsZ autoflushZpopulate_existingZ _autoflushrD r[ rC Z_execute_and_instances)r r^ Z baked_contextrI r: r& r r r �__iter__� s$ zResult.__iter__c s: t �td��� | j�� fdd��}|�| j��| j�� � S )z�return the 'count'. Equivalent to :meth:`.Query.count`. Note this uses a subquery to ensure an accurate count regardless of the structure of the original statement. .. versionadded:: 1.1.6 �*c s | � � �S )N)Z from_self)r: )�colr r r< � rU z Result.count.<locals>.<lambda>) r �countr r^ r, r1 r0 r[ r_ �scalar)r r^ r )rn r ro � s z Result.countc C s: y | � � }t|t�s|S |d S tjk r4 dS X dS )z�Return the first element of the first result or None if no rows present. If multiple rows are returned, raises MultipleResultsFound. Equivalent to :meth:`.Query.scalar`. .. versionadded:: 1.1.6 r N)�oner' r( �orm_exc� NoResultFound)r �retr r r rp � s z Result.scalarc C sL | j �dd� �}t|�| j��| j��| j��}t |�dkrD|d S dS dS )zLReturn the first row. Equivalent to :meth:`.Query.first`. c S s | � dd�S )Nr rQ )�slice)r: r r r r< � rU z Result.first.<locals>.<lambda>r N) r^ r, r# r1 r0 r[ r_ rf r` ra )r r^ rt r r r �first� s z Result.firstc C sH y | � � }W n tjk r, t�d��Y nX |dkr@t�d��|S dS )zeReturn exactly one result or raise an exception. Equivalent to :meth:`.Query.one`. z"Multiple rows were found for one()NzNo row was found for one())� one_or_nonerr �MultipleResultsFoundrs )r rt r r r rq � s z Result.onec C s: t | �}t|�}|dkr |d S |dkr,dS t�d��dS )z�Return one or zero results, or raise an exception for multiple rows. Equivalent to :meth:`.Query.one_or_none`. .. versionadded:: 1.0.9 rQ r Nz*Multiple rows were found for one_or_none())r# ra rr rx )r rt �lr r r rw � s zResult.one_or_nonec C s t | �S )zEReturn all rows. Equivalent to :meth:`.Query.all`. )r# )r r r r �all s z Result.allc C s | j jd | j�}|�|| j�S )zZRetrieve an object based on identity. Equivalent to :meth:`.Query.get`. r )r^ r r0 Z _get_impl�_load_on_pk_identity)r �identrD r r r rA s z Result.getc s� |� � ��j\� �� ����fdd�}�j}|�� }| j� f7 _|�|tdd� �D ���}t�fdd�t��j �D ��}t |� �j �j f |��}t|�}|dkr�t�� �n|r�|d S d S d S ) z6Load the given primary key identity from the database.c s| � }| � � }|�� d |_d �krLt�fdd�t�j��D ��}t�||�}|�|dd�}||_ x�j D ] }||�}qhW |S )Nc s" g | ]\}}|d kr� | j �qS )N)r> )�.0rn �value)� _get_paramsr r � <listcomp>1 s z>Result._load_on_pk_identity.<locals>.setup.<locals>.<listcomp>TF) r$ Z_get_conditionZ _order_by�set�zip� primary_key�sql_utilZadapt_criterion_to_nullZ _adapt_clauseZ _criterionr` )rD Z_lcl_get_clauser: Znonesr& )� _get_clauser �mapper�primary_key_identityr r r �setup& s z*Result._load_on_pk_identity.<locals>.setupc s s | ]}|d kV qd S )Nr )r} �elemr r r � <genexpr>N s z.Result._load_on_pk_identity.<locals>.<genexpr>c s g | ]\}}� | j |f�qS r )r> )r} Zid_valr� )r r r r� S s z/Result._load_on_pk_identity.<locals>.<listcomp>rQ r N)Z _mapper_zeror� r^ r$ r r, r( �dictr� r� r# r1 r0 r[ ra rr rx )r rD r� r� r^ r[ �resultry r )r� r r� r� r r r{ s& zResult._load_on_pk_identityN)r r r r r r r[ rf rZ rB rh rl ro rp rv rq rw rz rA r{ r r r r r/ Y s" r/ z1.2z5Baked lazy loading is now the default implementation.c C s dS )z�Enable the use of baked queries for all lazyloaders systemwide. The "baked" implementation of lazy loading is now the sole implementation for the base lazy loader; this method has no effect except for a warning. Nr r r r r �bake_lazy_loadersd s r� c C s t d��dS )aD Disable the use of baked queries for all lazyloaders systemwide. This method now raises NotImplementedError() as the "baked" implementation is the only lazy load implementation. The :paramref:`.relationship.bake_queries` flag may be used to disable the caching of queries on a per-relationship basis. z4Baked lazy loading is now the default implementationN)�NotImplementedErrorr r r r �unbake_lazy_loadersq s r� c C s | � |ddi�S )zxIndicate that the given attribute should be loaded using "lazy" loading with a "baked" query used in the load. ZlazyZ baked_select)Zset_relationship_strategy)ZloadoptrJ r r r �baked_lazyload� s r� zFBaked lazy loading is now the default implementation for lazy loading.c G s t j�t jj| di �S )NF)r � _UnboundLoad� _from_keysr� )�keysr r r r� � s c G s t j�t jj| di �S )NT)r r� r� r� )r� r r r �baked_lazyload_all� s r� )$r rj �logging� r rL r Zormrr r Z orm.queryr Z orm.sessionr Zsqlr r r� � getLoggerr �log�objectr r r/ Z deprecatedr� r� Z loader_optionr� Z_add_unbound_fnZ_add_unbound_all_fnr� Z _unbound_fnZ_unbound_all_fnr r r r r �<module> sF $