U
    }®cV:  ã                   @   s´   d dl Z d dlZd dlZd dlmZ d dlmZ d dlmZ d dl	m
Z
 d dlmZmZmZ d dlmZ d dlmZ d d	lmZ d d
lmZmZmZ d dlmZ G dd„ deƒZdS )é    N)Ú	lru_cache)Úchain)Úsettings)Ú
FieldError)ÚDatabaseErrorÚNotSupportedErrorÚmodels)ÚBaseDatabaseOperations)ÚCol)Útimezone)Ú
parse_dateÚparse_datetimeÚ
parse_time)Úcached_propertyc                       s`  e Zd ZdZdddœZdZdd„ Zdd„ Zd	d
„ Zdd„ Z	dPdd„Z
dQdd„Zdd„ Zdd„ Zdd„ Zdd„ Zdd„ Zdd„ Zdd„ Zd d!„ Zd"d#„ Zd$d%„ Zd&d'„ Zd(d)„ Zed*d+„ ƒZd,d,d-œd.d/„Zd0d1„ Zd2d3„ Zd4d5„ Z‡ fd6d7„Zd8d9„ Zd:d;„ Z d<d=„ Z!d>d?„ Z"d@dA„ Z#dBdC„ Z$dDdE„ Z%‡ fdFdG„Z&dHdI„ Z'dJdK„ Z(dLdM„ Z)dR‡ fdNdO„	Z*‡  Z+S )SÚDatabaseOperationsÚtextZTEXT)Ú	DateFieldÚDateTimeFieldzEXPLAIN QUERY PLANc                 C   s:   t |ƒdkrdS t |ƒdkr.| jjjt |ƒ S t |ƒS dS )zà
        SQLite has a compile-time default (SQLITE_LIMIT_VARIABLE_NUMBER) of
        999 variables per query.

        If there's only a single field to insert, the limit is 500
        (SQLITE_MAX_COMPOUND_SELECT).
        é   iô  N)ÚlenÚ
connectionÚfeaturesZmax_query_params)ÚselfÚfieldsÚobjs© r   úI/tmp/pip-unpacked-wheel-7m9rsep5/django/db/backends/sqlite3/operations.pyÚbulk_batch_size   s
    z"DatabaseOperations.bulk_batch_sizec              
   C   sž   t jt jt jf}t jt jt jt jf}t||ƒrr| 	¡ D ]:}z
|j
}W n ttfk
r\   Y q6X t||ƒr6tdƒ‚q6t|t jƒrš|jršt|jƒdkrštdƒ‚d S )Nz{You cannot use Sum, Avg, StdDev, and Variance aggregations on date/time fields in sqlite3 since date/time is saved as text.r   zTSQLite doesn't support DISTINCT on aggregate functions accepting multiple arguments.)r   r   r   Ú	TimeFieldZSumZAvgZVarianceZStdDevÚ
isinstanceZget_source_expressionsÚoutput_fieldÚAttributeErrorr   r   Z	AggregateZdistinctr   Zsource_expressions)r   Ú
expressionZ
bad_fieldsZbad_aggregatesÚexprr    r   r   r   Úcheck_expression_support(   s*    


ÿ
ÿþýÿz+DatabaseOperations.check_expression_supportc                 C   s   d|  ¡ |f S )zè
        Support EXTRACT with a user-defined function django_date_extract()
        that's registered in connect(). Use single quotes because this is a
        string and could otherwise cause a collision with a field name.
        zdjango_date_extract('%s', %s)©Úlower©r   Úlookup_typeÚ
field_namer   r   r   Údate_extract_sqlD   s    z#DatabaseOperations.date_extract_sqlc                 C   s   |S )z>Do nothing since formatting is handled in the custom function.r   )r   Úsqlr   r   r   Úformat_for_duration_arithmeticL   s    z1DatabaseOperations.format_for_duration_arithmeticNc                 C   s   d|  ¡ |f|  |¡˜ S )Nz#django_date_trunc('%s', %s, %s, %s)©r&   Ú_convert_tznames_to_sql©r   r(   r)   Útznamer   r   r   Údate_trunc_sqlP   s    þýz!DatabaseOperations.date_trunc_sqlc                 C   s   d|  ¡ |f|  |¡˜ S )Nz#django_time_trunc('%s', %s, %s, %s)r-   r/   r   r   r   Útime_trunc_sqlW   s    þýz!DatabaseOperations.time_trunc_sqlc                 C   s"   |rt jrd| d| jj fS dS )Nú'%s')ÚNULLr4   )r   ÚUSE_TZr   Ztimezone_name)r   r0   r   r   r   r.   ^   s    
z*DatabaseOperations._convert_tznames_to_sqlc                 C   s   d|f|   |¡˜ S )Nz%django_datetime_cast_date(%s, %s, %s)©r.   ©r   r)   r0   r   r   r   Údatetime_cast_date_sqlc   s
    ÿÿz)DatabaseOperations.datetime_cast_date_sqlc                 C   s   d|f|   |¡˜ S )Nz%django_datetime_cast_time(%s, %s, %s)r6   r7   r   r   r   Údatetime_cast_time_sqlh   s
    ÿÿz)DatabaseOperations.datetime_cast_time_sqlc                 C   s   d|  ¡ |f|  |¡˜ S )Nz)django_datetime_extract('%s', %s, %s, %s)r-   r/   r   r   r   Údatetime_extract_sqlm   s     ÿÿz'DatabaseOperations.datetime_extract_sqlc                 C   s   d|  ¡ |f|  |¡˜ S )Nz'django_datetime_trunc('%s', %s, %s, %s)r-   r/   r   r   r   Údatetime_trunc_sqlr   s     ÿÿz%DatabaseOperations.datetime_trunc_sqlc                 C   s   d|  ¡ |f S )Nzdjango_time_extract('%s', %s)r%   r'   r   r   r   Útime_extract_sqlw   s    z#DatabaseOperations.time_extract_sqlc                 C   s   dS )Nr4   r   ©r   r   r   r   Úpk_default_valuez   s    z#DatabaseOperations.pk_default_valuec                 C   s”   d}t |ƒ|krLd}tdt |ƒ|ƒD ]"}|||| … }||  |¡7 }q$|S dd dgt |ƒ ¡ }| jj ¡ }z| ||¡ ¡ W ¢S | ¡  X dS )zV
        Only for last_executed_query! Don't use this to execute SQL queries!
        iç  r   r   zSELECT ú, zQUOTE(?)N)	r   ÚrangeÚ%_quote_params_for_last_executed_queryÚjoinr   ÚcursorÚcloseÚexecuteZfetchone)r   ÚparamsZ
BATCH_SIZEÚresultsÚindexÚchunkr+   rC   r   r   r   rA   }   s    	z8DatabaseOperations._quote_params_for_last_executed_queryc                 C   sR   |rJt |ttfƒr|  |¡}n$t| ¡ ƒ}|  |¡}tt||ƒƒ}|| S |S d S ©N)r   ÚlistÚtuplerA   ÚvaluesÚdictÚzip)r   rC   r+   rF   rM   r   r   r   Úlast_executed_query˜   s    
z&DatabaseOperations.last_executed_queryc                 C   s    |  d¡r| d¡r|S d| S )Nú"z"%s")Ú
startswithÚendswith)r   Únamer   r   r   Ú
quote_nameª   s    zDatabaseOperations.quote_namec                 C   s   dS )Néÿÿÿÿr   r=   r   r   r   Úno_limit_value¯   s    z!DatabaseOperations.no_limit_valuec              
   C   sN   d}|ddf}| j  ¡ �,}| ||¡}dd„ | ¡ D ƒW  5 Q R £ S Q R X d S )Nz÷
        WITH tables AS (
            SELECT %s name
            UNION
            SELECT sqlite_master.name
            FROM sqlite_master
            JOIN tables ON (sql REGEXP %s || tables.name || %s)
        ) SELECT name FROM tables;
        z(?i)\s+references\s+("|\')?z("|\')?\s*\(c                 S   s   g | ]}|d  ‘qS )r   r   ©Ú.0Úrowr   r   r   Ú
<listcomp>Ã   s     z9DatabaseOperations.__references_graph.<locals>.<listcomp>)r   rC   rE   Zfetchall)r   Z
table_nameÚqueryrF   rC   rG   r   r   r   Z__references_graph²   s    
ýz%DatabaseOperations.__references_graphc                 C   s   t dd�| jƒS )Ni   )Úmaxsize)r   Ú%_DatabaseOperations__references_graphr=   r   r   r   Ú_references_graphÅ   s    z$DatabaseOperations._references_graphF)Úreset_sequencesÚallow_cascadec                   s`   |r$|r$t t ‡ fdd„|D ƒ¡ƒ}‡ ‡fdd„|D ƒ}|r\dd„ |D ƒ}| ˆ  ˆ|¡¡ |S )Nc                 3   s   | ]}ˆ   |¡V  qd S rJ   )r_   ©rY   Útabler=   r   r   Ú	<genexpr>Ï   s     z/DatabaseOperations.sql_flush.<locals>.<genexpr>c              
      s2   g | ]*}d ˆ  d¡ˆ  d¡ˆ ˆ  |¡¡f ‘qS )z	%s %s %s;ÚDELETEZFROM)ÚSQL_KEYWORDÚ	SQL_FIELDrU   rb   ©r   Ústyler   r   r[   Ð   s   üýz0DatabaseOperations.sql_flush.<locals>.<listcomp>c                 S   s   g | ]}d |i‘qS )rc   r   rb   r   r   r   r[   Ö   s     )Úsetr   Úfrom_iterableÚextendÚsequence_reset_by_name_sql)r   ri   Ztablesr`   ra   r+   Ú	sequencesr   rh   r   Ú	sql_flushË   s    üzDatabaseOperations.sql_flushc                 C   sn   |sg S d|  d¡| |  d¡¡|  d¡| |  d¡¡|  d¡| |  d¡¡|  d¡d	 d
d„ |D ƒ¡f gS )Nz%s %s %s %s = 0 %s %s %s (%s);ZUPDATEZsqlite_sequenceZSETÚseqZWHERErT   ÚINr?   c                 S   s   g | ]}d |d  ‘qS )r3   rc   r   )rY   Zsequence_infor   r   r   r[   æ   s    zADatabaseOperations.sequence_reset_by_name_sql.<locals>.<listcomp>)rf   Z	SQL_TABLErU   rg   rB   )r   ri   rn   r   r   r   rm   Ú   s    
ÿøÿz-DatabaseOperations.sequence_reset_by_name_sqlc                 C   sL   |d krd S t |dƒr|S t |¡rDtjr<t || jj¡}ntdƒ‚t|ƒS )NÚresolve_expressionzNSQLite backend does not support timezone-aware datetimes when USE_TZ is False.)	Úhasattrr   Úis_awarer   r5   Z
make_naiver   Ú
ValueErrorÚstr©r   Úvaluer   r   r   Úadapt_datetimefield_valueì   s    

z,DatabaseOperations.adapt_datetimefield_valuec                 C   s4   |d krd S t |dƒr|S t |¡r,tdƒ‚t|ƒS )Nrr   z5SQLite backend does not support timezone-aware times.)rs   r   rt   ru   rv   rw   r   r   r   Úadapt_timefield_valueý   s    

z(DatabaseOperations.adapt_timefield_valuec                    s    t ƒ  |¡}|j ¡ }|dkr,| | j¡ np|dkrB| | j¡ nZ|dkrX| | j¡ nD|dkrr| |  |¡¡ n*|dkrˆ| | j	¡ n|dkrœ| | j
¡ |S )Nr   r   r   ZDecimalFieldZ	UUIDField)ZNullBooleanFieldZBooleanField)ÚsuperÚget_db_convertersr    Zget_internal_typeÚappendÚconvert_datetimefield_valueÚconvert_datefield_valueÚconvert_timefield_valueÚget_decimalfield_converterÚconvert_uuidfield_valueÚconvert_booleanfield_value)r   r"   Ú
convertersÚinternal_type©Ú	__class__r   r   r|     s    
z$DatabaseOperations.get_db_convertersc                 C   s@   |d k	r<t |tjƒst|ƒ}tjr<t |¡s<t || jj¡}|S rJ   )	r   Údatetimer   r   r5   r   rt   Z
make_awarer   ©r   rx   r"   r   r   r   r   r~     s    z.DatabaseOperations.convert_datetimefield_valuec                 C   s    |d k	rt |tjƒst|ƒ}|S rJ   )r   rˆ   Údater   r‰   r   r   r   r   $  s    z*DatabaseOperations.convert_datefield_valuec                 C   s    |d k	rt |tjƒst|ƒ}|S rJ   )r   rˆ   Útimer   r‰   r   r   r   r€   *  s    z*DatabaseOperations.convert_timefield_valuec                    sN   t jdd�j‰ t|tƒr>t  d¡ |jj ¡‰‡ ‡fdd„}n‡ fdd„}|S )Né   )Úprecr   c                    s"   | d k	rˆ | ƒj ˆ|jjd�S d S )N)Úcontext)Úquantizer    rŽ   ©rx   r"   r   ©Úcreate_decimalZquantize_valuer   r   Ú	converter7  s    z@DatabaseOperations.get_decimalfield_converter.<locals>.converterc                    s   | d k	rˆ | ƒS d S rJ   r   r�   )r’   r   r   r“   ;  s    )	ÚdecimalÚContextÚcreate_decimal_from_floatr   r
   ÚDecimalÚscalebr    Zdecimal_places)r   r"   r“   r   r‘   r   r�   0  s    
z-DatabaseOperations.get_decimalfield_converterc                 C   s   |d k	rt  |¡}|S rJ   )ÚuuidÚUUIDr‰   r   r   r   r‚   @  s    
z*DatabaseOperations.convert_uuidfield_valuec                 C   s   |dkrt |ƒS |S )N)r   r   )Úboolr‰   r   r   r   rƒ   E  s    z-DatabaseOperations.convert_booleanfield_valuec                 C   s   d  dd„ |D ƒ¡S )Nz UNION ALL c                 s   s   | ]}d d  |¡ V  qdS )z	SELECT %sr?   N©rB   rX   r   r   r   rd   I  s   ÿz5DatabaseOperations.bulk_insert_sql.<locals>.<genexpr>rœ   )r   r   Zplaceholder_rowsr   r   r   Úbulk_insert_sqlH  s    
þz"DatabaseOperations.bulk_insert_sqlc                    s:   |dkrdd  |¡ S |dkr,dd  |¡ S tƒ  ||¡S )Nú^z	POWER(%s)ú,ú#z
BITXOR(%s))rB   r{   Úcombine_expression)r   Ú	connectorÚsub_expressionsr†   r   r   r¡   N  s
    z%DatabaseOperations.combine_expressionc                 C   sD   |dkrt d| ƒ‚d| g| }t|ƒdkr6tdƒ‚dd |¡ S )N)ú+ú-z$Invalid connector for timedelta: %s.r3   é   z)Too many params for timedelta operations.zdjango_format_dtdelta(%s)r?   )r   r   ru   rB   )r   r¢   r£   Z	fn_paramsr   r   r   Úcombine_duration_expressionW  s    z.DatabaseOperations.combine_duration_expressionc                 C   s   dS )N)NNr   )r   r…   r   r   r   Úinteger_field_range_  s    z&DatabaseOperations.integer_field_rangec           	      C   s@   |\}}|\}}||˜}|dkr0d||f |fS d||f |fS )Nr   zdjango_time_diff(%s, %s)zdjango_timestamp_diff(%s, %s)r   )	r   r…   ÚlhsÚrhsZlhs_sqlZ
lhs_paramsZrhs_sqlZ
rhs_paramsrF   r   r   r   Úsubtract_temporalsc  s    z%DatabaseOperations.subtract_temporalsc                    s   |rdS t ƒ  |¡S )NzINSERT OR IGNORE INTO)r{   Úinsert_statement)r   Zignore_conflictsr†   r   r   r¬   k  s    z#DatabaseOperations.insert_statement)N)N)F),Ú__name__Ú
__module__Ú__qualname__Z"cast_char_field_without_max_lengthZcast_data_typesZexplain_prefixr   r$   r*   r,   r1   r2   r.   r8   r9   r:   r;   r<   r>   rA   rP   rU   rW   r^   r   r_   ro   rm   ry   rz   r|   r~   r   r€   r�   r‚   rƒ   r�   r¡   r§   r¨   r«   r¬   Ú__classcell__r   r   r†   r   r      sT   þ


	r   )rˆ   r”   r™   Ú	functoolsr   Ú	itertoolsr   Zdjango.confr   Zdjango.core.exceptionsr   Z	django.dbr   r   r   Z"django.db.backends.base.operationsr	   Zdjango.db.models.expressionsr
   Zdjango.utilsr   Zdjango.utils.dateparser   r   r   Zdjango.utils.functionalr   r   r   r   r   r   Ú<module>   s   