a
    Lcòf/  ã                   @   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ƒZ
G dd	„ d	eƒZG d
d„ deƒZG dd„ deƒZdS )zR
Query subclasses which provide extra functionality beyond simple data retrieval.
é    )Ú
FieldError)ÚCURSORÚGET_ITERATOR_CHUNK_SIZEÚ
NO_RESULTS)ÚQuery)ÚDeleteQueryÚUpdateQueryÚInsertQueryÚAggregateQueryc                   @   s$   e Zd ZdZdZdd„ Zdd„ ZdS )r   zA DELETE SQL query.ZSQLDeleteCompilerc                 C   sX   || j | i| _ || _|  |¡ t¡}|rT|� |jW  d   ƒ S 1 sJ0    Y  dS )Nr   )Z	alias_mapÚwhereÚget_compilerÚexecute_sqlr   Zrowcount)ÚselfÚtabler   ÚusingÚcursor© r   ú\/home/httpd/docs/test/DocsMgr/lib/python3.9/site-packages/django/db/models/sql/subqueries.pyÚdo_query   s    $zDeleteQuery.do_queryc                 C   sl   d}|   ¡ j}tdt|ƒtƒD ]H}|  ¡  |  |j› d�|||t … ¡ || j|   ¡ j	| j
|d�7 }q|S )zº
        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   )Úget_metaÚpkÚrangeÚlenr   Úclear_whereÚ
add_filterZattnamer   Zdb_tabler   )r   Úpk_listr   Znum_deletedÚfieldÚoffsetr   r   r   Údelete_batch   s    

þÿ
zDeleteQuery.delete_batchN)Ú__name__Ú
__module__Ú__qualname__Ú__doc__Ú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 ƒ j|i |¤Ž |  ¡  d S ©N)ÚsuperÚ__init__Ú_setup_query)r   ÚargsÚkwargs©Ú	__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)ÚvaluesÚrelated_idsÚrelated_updates)r   r   r   r   r'   9   s    zUpdateQuery._setup_queryc                    s   t ƒ  ¡ }| j ¡ |_|S r$   )r%   Úcloner.   Úcopy)r   Úobjr*   r   r   r/   B   s    
zUpdateQuery.clonec                 C   sT   |   |¡ tdt|ƒtƒD ]4}|  ¡  |  d|||t … ¡ |  |¡ t¡ qd S )Nr   Úpk__in)	Úadd_update_valuesr   r   r   r   r   r   r   r   )r   r   r,   r   r   r   r   r   Úupdate_batchG   s    
ÿzUpdateQuery.update_batchc                 C   sš   g }|  ¡ D ]‚\}}|  ¡  |¡}|jo.|j  p8|j }|jjj}|rT|jr`|j	r`t
d| ƒ‚||  ¡ 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).)Úitemsr   Ú	get_fieldZauto_createdZconcreteÚmodelÚ_metaZconcrete_modelZis_relationZmany_to_manyr   Úadd_related_updateÚappendÚadd_update_fields)r   r,   Ú
values_seqÚnameÚvalr   Údirectr7   r   r   r   r3   P   s"    ÿ
ÿÿzUpdateQuery.add_update_valuesc                 C   s@   |D ]6\}}}t |dƒr(|j| ddd�}| j |||f¡ qdS )zó
        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.
        Úresolve_expressionFT)Zallow_joinsZfor_saveN)Ú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 )zž
        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.   Ú
setdefaultr:   )r   r7   r   Úvaluer   r   r   r9   t   s    zUpdateQuery.add_related_updatec                 C   sZ   | j s
g S g }| j  ¡ D ]<\}}t|ƒ}||_| jdurJ| d| j| ¡ | |¡ q|S )zá
        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   Úresultr7   r,   Úqueryr   r   r   Úget_related_updates|   s    
zUpdateQuery.get_related_updates)r   r    r!   r"   r#   r&   r'   r/   r4   r3   r;   r9   rF   Ú__classcell__r   r   r*   r   r   0   s   		r   c                       s4   e Zd ZdZddddœ‡ fdd„
Zd	dd„Z‡  ZS )
r	   ZSQLInsertCompilerN)Úon_conflictÚupdate_fieldsÚunique_fieldsc                   s<   t ƒ j|i |¤Ž g | _g | _|| _|p*g | _|p4g | _d S r$   )r%   r&   ÚfieldsÚobjsrH   rI   rJ   )r   rH   rI   rJ   r(   r)   r*   r   r   r&   ‘   s    
zInsertQuery.__init__Fc                 C   s   || _ || _|| _d S r$   )rK   rL   Úraw)r   rK   rL   rM   r   r   r   Úinsert_values›   s    zInsertQuery.insert_values)F)r   r    r!   r#   r&   rN   rG   r   r   r*   r   r	   Ž   s   ÿ
r	   c                       s$   e Zd ZdZdZ‡ fdd„Z‡  ZS )r
   zu
    Take another query as a parameter to the FROM clause and only select the
    elements in the provided list.
    ZSQLAggregateCompilerc                    s   || _ tƒ  |¡ d S r$   )Úinner_queryr%   r&   )r   r7   rO   r*   r   r   r&   ©   s    zAggregateQuery.__init__)r   r    r!   r"   r#   r&   rG   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   Ú__all__r   r   r	   r
   r   r   r   r   Ú<module>   s   $^