U
    8ÄT_:  ã                   @   sÀ   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 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duration_microseconds)Úcached_propertyc                       sd  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	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$„ Zd%d&„ Zd'd(„ Zd)d*„ Zed+d,„ ƒZd-d-d.œd/d0„Zd1d2„ Zd3d4„ Zd5d6„ Z‡ fd7d8„Zd9d:„ Z d;d<„ Z!d=d>„ Z"d?d@„ Z#dAdB„ Z$dCdD„ Z%dEdF„ Z&‡ fdGdH„Z'dIdJ„ Z(dKdL„ Z)dMdN„ Z*dQ‡ fdOdP„	Z+‡  Z,S )RÚ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-dv63caxw/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_sqlE   s    z#DatabaseOperations.date_extract_sqlc                 C   s   t t|ƒƒS ©N)Ústrr   )r   Ú	timedeltar   r   r   Údate_interval_sqlM   s    z$DatabaseOperations.date_interval_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_arithmeticP   s    z1DatabaseOperations.format_for_duration_arithmeticc                 C   s   d|  ¡ |f S )Nzdjango_date_trunc('%s', %s)r&   r(   r   r   r   Údate_trunc_sqlT   s    z!DatabaseOperations.date_trunc_sqlc                 C   s   d|  ¡ |f S )Nzdjango_time_trunc('%s', %s)r&   r(   r   r   r   Útime_trunc_sqlW   s    z!DatabaseOperations.time_trunc_sqlc                 C   s   t jrd| d| jj fS dS )Nú'%s')ÚNULLr5   )r   ÚUSE_TZr   Ztimezone_name)r   Útznamer   r   r   Ú_convert_tznames_to_sqlZ   s    z*DatabaseOperations._convert_tznames_to_sqlc                 C   s   d|f|   |¡˜ S )Nz%django_datetime_cast_date(%s, %s, %s)©r8   ©r   r*   r7   r   r   r   Údatetime_cast_date_sql_   s
    ÿÿz)DatabaseOperations.datetime_cast_date_sqlc                 C   s   d|f|   |¡˜ S )Nz%django_datetime_cast_time(%s, %s, %s)r9   r:   r   r   r   Údatetime_cast_time_sqld   s
    ÿÿz)DatabaseOperations.datetime_cast_time_sqlc                 C   s   d|  ¡ |f|  |¡˜ S )Nz)django_datetime_extract('%s', %s, %s, %s)©r'   r8   ©r   r)   r*   r7   r   r   r   Údatetime_extract_sqli   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_sqln   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_sqls   s    z#DatabaseOperations.time_extract_sqlc                 C   s   dS )Nr5   r   ©r   r   r   r   Úpk_default_valuev   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chunkr0   rH   r   r   r   rF   y   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 r,   )r    ÚlistÚtuplerF   ÚvaluesÚdictÚzip)r   rH   r0   rK   rQ   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_name¦   s    zDatabaseOperations.quote_namec                 C   s   dS )Néÿÿÿÿr   rB   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>¿   s     z9DatabaseOperations.__references_graph.<locals>.<listcomp>)r   rH   rJ   Zfetchall)r   Z
table_nameÚqueryrK   rH   rL   r   r   r   Z__references_graph®   s    
ýz%DatabaseOperations.__references_graphc                 C   s   t dd�| jƒS )Ni   )Úmaxsize)r   Ú%_DatabaseOperations__references_graphrB   r   r   r   Ú_references_graphÁ   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 r,   )rc   ©r]   ÚtablerB   r   r   Ú	<genexpr>Ë   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_FIELDrY   rf   ©r   Ústyler   r   r_   Ì   s   üýz0DatabaseOperations.sql_flush.<locals>.<listcomp>c                 S   s   g | ]}d |i‘qS )rg   r   rf   r   r   r   r_   Ò   s     )Úsetr   Úfrom_iterableÚextendÚsequence_reset_by_name_sql)r   rm   Útablesrd   re   r0   Ú	sequencesr   rl   r   Ú	sql_flushÇ   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WHERErX   ÚINrD   c                 S   s   g | ]}d |d  ‘qS )r4   rg   r   )r]   Zsequence_infor   r   r   r_   â   s    zADatabaseOperations.sequence_reset_by_name_sql.<locals>.<listcomp>)rj   Z	SQL_TABLErY   rk   rG   )r   rm   rs   r   r   r   rq   Ö   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   r6   Z
make_naiver   Ú
ValueErrorr-   ©r   Úvaluer   r   r   Úadapt_datetimefield_valueè   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 )Nrw   z5SQLite backend does not support timezone-aware times.)rx   r   ry   rz   r-   r{   r   r   r   Úadapt_timefield_valueù   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 r,   )	r    Údatetimer   r   r6   r   ry   Z
make_awarer   ©r   r|   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 r,   )r    rŒ   Údater   r�   r   r   r   rƒ      s    z*DatabaseOperations.convert_datefield_valuec                 C   s    |d k	rt |tjƒst|ƒ}|S r,   )r    rŒ   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!   r’   ©r|   r#   r   ©Úcreate_decimalZquantize_valuer   r   Ú	converter3  s    z@DatabaseOperations.get_decimalfield_converter.<locals>.converterc                    s   | d k	rˆ | ƒS d S r,   r   r”   )r–   r   r   r—   7  s    )	ÚdecimalÚContextÚcreate_decimal_from_floatr    r
   ÚDecimalÚscalebr!   Zdecimal_places)r   r#   r—   r   r•   r   r…   ,  s    
z-DatabaseOperations.get_decimalfield_converterc                 C   s   |d k	rt  |¡}|S r,   )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   r‡   A  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 %srD   N©rG   r\   r   r   r   rh   E  s   ÿz5DatabaseOperations.bulk_insert_sql.<locals>.<genexpr>r    )r   r   Zplaceholder_rowsr   r   r   Úbulk_insert_sqlD  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))rG   r   Úcombine_expression)r   Ú	connectorÚsub_expressionsrŠ   r   r   r¥   J  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.r4   é   z)Too many params for timedelta operations.zdjango_format_dtdelta(%s)rD   )r   r   rz   rG   )r   r¦   r§   Z	fn_paramsr   r   r   Úcombine_duration_expressionS  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_paramsrK   r   r   r   Úsubtract_temporals_  s    z%DatabaseOperations.subtract_temporalsc                    s   |rdS t ƒ  |¡S )NzINSERT OR IGNORE INTO)r   Úinsert_statement)r   Zignore_conflictsrŠ   r   r   r°   g  s    z#DatabaseOperations.insert_statement)F)-Ú__name__Ú
__module__Ú__qualname__Z"cast_char_field_without_max_lengthZcast_data_typesZexplain_prefixr   r%   r+   r/   r1   r2   r3   r8   r;   r<   r?   r@   rA   rC   rF   rT   rY   r[   rb   r   rc   rt   rq   r}   r~   r€   r‚   rƒ   r„   r…   r†   r‡   r¡   r¥   r«   r¬   r¯   r°   Ú__classcell__r   r   rŠ   r   r      sV   þ
	r   )rŒ   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.durationr   Zdjango.utils.functionalr   r   r   r   r   r   Ú<module>   s   