o
    `Zh                     @   s|   d Z ddlmZ ddlmZmZmZ ddlmZ g dZ	G dd deZ
G dd	 d	eZG d
d deZG dd deZdS )zR
Query subclasses which provide extra functionality beyond simple data retrieval.
    )
FieldError)CURSORGET_ITERATOR_CHUNK_SIZE
NO_RESULTS)Query)DeleteQueryUpdateQueryInsertQueryAggregateQueryc                   @   s$   e Zd ZdZdZdd Zdd ZdS )r   zA DELETE SQL query.ZSQLDeleteCompilerc                 C   sX   || j | i| _ || _| |t}|r*| |jW  d    S 1 s%w   Y  dS )Nr   )Z	alias_mapwhereget_compilerexecute_sqlr   Zrowcount)selftabler   usingcursor r   V/var/www/html/lang_env/lib/python3.10/site-packages/django/db/models/sql/subqueries.pydo_query   s    zDeleteQuery.do_queryc                 C   sl   d}|   j}tdt|tD ]$}|   | |j d|||t   || j|   j	| j
|d7 }q|S )z
        Set up and execute delete queries for all the objects in pk_list.

        More than one physical query may be executed if there are a
        lot of values in pk_list.
        r   Z__in)r   )get_metapkrangelenr   clear_where
add_filterZattnamer   Zdb_tabler   )r   pk_listr   Znum_deletedfieldoffsetr   r   r   delete_batch   s   


zDeleteQuery.delete_batchN)__name__
__module____qualname____doc__compilerr   r   r   r   r   r   r      s
    	r   c                       s`   e Zd ZdZdZ fddZdd Z fddZd	d
 Zdd Z	dd Z
dd Zdd Z  ZS )r   zAn UPDATE SQL query.ZSQLUpdateCompilerc                    s   t  j|i | |   d S N)super__init___setup_query)r   argskwargs	__class__r   r   r&   5   s   zUpdateQuery.__init__c                 C   s   g | _ d| _i | _dS )z
        Run on initialization and at the end of chaining. Any attributes that
        would normally be set in __init__() should go here instead.
        N)valuesrelated_idsrelated_updates)r   r   r   r   r'   9   s   
zUpdateQuery._setup_queryc                    s   t   }| j |_|S r$   )r%   cloner.   copy)r   objr*   r   r   r/   B   s   
zUpdateQuery.clonec                 C   sT   |  | tdt|tD ]}|   | d|||t   | |t qd S )Nr   pk__in)	add_update_valuesr   r   r   r   r   r   r   r   )r   r   r,   r   r   r   r   r   update_batchG   s   
zUpdateQuery.update_batchc                 C   s   g }|  D ]A\}}|  |}|jo|j  p|j }|jjj}|r*|jr0|j	r0t
d| ||  jur?| ||| q||||f q| |S )z
        Convert a dictionary of field name to value mappings into an update
        query. This is the entry point for the public update() method on
        querysets.
        zMCannot update model field %r (only non-relations and foreign keys permitted).)itemsr   	get_fieldZauto_createdZconcretemodel_metaZconcrete_modelZis_relationZmany_to_manyr   add_related_updateappendadd_update_fields)r   r,   
values_seqnamevalr   directr7   r   r   r   r3   P   s"   

zUpdateQuery.add_update_valuesc                 C   sH   |D ]\}}}|j rqt|dr|j| ddd}| j|||f qdS )z
        Append a sequence of (field, model, value) triples to the internal list
        that will be used to generate the UPDATE query. Might be more usefully
        called add_update_targets() to hint at the extra information here.
        resolve_expressionFT)Zallow_joinsZfor_saveN)	generatedhasattrr@   r,   r:   )r   r<   r   r7   r>   r   r   r   r;   h   s   
zUpdateQuery.add_update_fieldsc                 C   s   | j |g |d|f dS )z
        Add (name, value) to an update query for an ancestor model.

        Update are coalesced so that only one update query per ancestor is run.
        N)r.   
setdefaultr:   )r   r7   r   valuer   r   r   r9   w   s   zUpdateQuery.add_related_updatec                 C   sZ   | j sg S g }| j  D ]\}}t|}||_| jdur%|d| j|  || q|S )z
        Return a list of query objects: one for each update required to an
        ancestor model. Each query will have the same filtering conditions as
        the current query but will only update a single table.
        Nr2   )r.   r5   r   r,   r-   r   r:   )r   resultr7   r,   queryr   r   r   get_related_updates   s   
zUpdateQuery.get_related_updates)r   r    r!   r"   r#   r&   r'   r/   r4   r3   r;   r9   rG   __classcell__r   r   r*   r   r   0   s    		r   c                       s4   e Zd ZdZdddd fdd
Zd	ddZ  ZS )
r	   ZSQLInsertCompilerN)on_conflictupdate_fieldsunique_fieldsc                   s<   t  j|i | g | _g | _|| _|pg | _|pg | _d S r$   )r%   r&   fieldsobjsrI   rJ   rK   )r   rI   rJ   rK   r(   r)   r*   r   r   r&      s   
zInsertQuery.__init__Fc                 C   s   || _ || _|| _d S r$   )rL   rM   raw)r   rL   rM   rN   r   r   r   insert_values   s   
zInsertQuery.insert_values)F)r   r    r!   r#   r&   rO   rH   r   r   r*   r   r	      s
    
r	   c                       s$   e Zd ZdZdZ fddZ  ZS )r
   zu
    Take another query as a parameter to the FROM clause and only select the
    elements in the provided list.
    ZSQLAggregateCompilerc                    s   || _ t | d S r$   )inner_queryr%   r&   )r   r7   rP   r*   r   r   r&      s   zAggregateQuery.__init__)r   r    r!   r"   r#   r&   rH   r   r   r*   r   r
      s    r
   N)r"   Zdjango.core.exceptionsr   Zdjango.db.models.sql.constantsr   r   r   Zdjango.db.models.sql.queryr   __all__r   r   r	   r
   r   r   r   r   <module>   s    $a