U
    HaV:                     @   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ZdS )    N)	lru_cache)chain)settings)
FieldError)DatabaseErrorNotSupportedErrormodels)BaseDatabaseOperations)Col)timezone)
parse_dateparse_datetime
parse_time)cached_propertyc                       s`  e Zd ZdZddd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$d% Zd&d' Zd(d) Zed*d+ Zd,d,d-d.d/Zd0d1 Zd2d3 Zd4d5 Z fd6d7Zd8d9 Zd:d; Z d<d= Z!d>d? Z"d@dA Z#dBdC Z$dDdE Z% fdFdGZ&dHdI Z'dJdK Z(dLdM Z)dR fdNdO	Z*  Z+S )SDatabaseOperationstextZTEXT)	DateFieldDateTimeFieldzEXPLAIN QUERY PLANc                 C   s:   t |dkrdS t |dkr.| jjjt | S t |S dS )z
        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).
           i  N)len
connectionfeaturesZmax_query_params)selffieldsobjs r   I/tmp/pip-unpacked-wheel-3jxiddxt/django/db/backends/sqlite3/operations.pybulk_batch_size   s
    z"DatabaseOperations.bulk_batch_sizec              
   C   s   t jt jt jf}t jt jt jt jf}t||rr|	 D ]:}z
|j
}W n ttfk
r\   Y q6X t||r6tdq6t|t jr|jrt|jdkrtd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   	TimeFieldZSumZAvgZVarianceZStdDev
isinstanceZget_source_expressionsoutput_fieldAttributeErrorr   r   Z	AggregateZdistinctr   Zsource_expressions)r   
expressionZ
bad_fieldsZbad_aggregatesexprr    r   r   r   check_expression_support(   s*    



z+DatabaseOperations.check_expression_supportc                 C   s   d|  |f S )z
        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)lowerr   lookup_type
field_namer   r   r   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   sqlr   r   r   format_for_duration_arithmeticL   s    z1DatabaseOperations.format_for_duration_arithmeticNc                 C   s   d|  |f| | S )Nz#django_date_trunc('%s', %s, %s, %s)r&   _convert_tznames_to_sqlr   r(   r)   tznamer   r   r   date_trunc_sqlP   s    z!DatabaseOperations.date_trunc_sqlc                 C   s   d|  |f| | S )Nz#django_time_trunc('%s', %s, %s, %s)r-   r/   r   r   r   time_trunc_sqlW   s    z!DatabaseOperations.time_trunc_sqlc                 C   s"   |rt jrd| d| jj fS dS )N'%s')NULLr4   )r   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   datetime_cast_date_sqlc   s
    z)DatabaseOperations.datetime_cast_date_sqlc                 C   s   d|f|  | S )Nz%django_datetime_cast_time(%s, %s, %s)r6   r7   r   r   r   datetime_cast_time_sqlh   s
    z)DatabaseOperations.datetime_cast_time_sqlc                 C   s   d|  |f| | S )Nz)django_datetime_extract('%s', %s, %s, %s)r-   r/   r   r   r   datetime_extract_sqlm   s     z'DatabaseOperations.datetime_extract_sqlc                 C   s   d|  |f| | S )Nz'django_datetime_trunc('%s', %s, %s, %s)r-   r/   r   r   r   datetime_trunc_sqlr   s     z%DatabaseOperations.datetime_trunc_sqlc                 C   s   d|  |f S )Nzdjango_time_extract('%s', %s)r%   r'   r   r   r   time_extract_sqlw   s    z#DatabaseOperations.time_extract_sqlc                 C   s   dS )Nr4   r   r   r   r   r   pk_default_valuez   s    z#DatabaseOperations.pk_default_valuec                 C   s   d}t ||krLd}tdt ||D ]"}||||  }|| |7 }q$|S dddgt |  }| jj }z||| W S |  X dS )zV
        Only for last_executed_query! Don't use this to execute SQL queries!
        i  r   r   zSELECT , zQUOTE(?)N)	r   range%_quote_params_for_last_executed_queryjoinr   cursorcloseexecuteZfetchone)r   paramsZ
BATCH_SIZEresultsindexchunkr+   rC   r   r   r   rA   }   s    	z8DatabaseOperations._quote_params_for_last_executed_queryc                 C   sR   |rJt |ttfr| |}n$t| }| |}tt||}|| S |S d S N)r   listtuplerA   valuesdictzip)r   rC   r+   rF   rM   r   r   r   last_executed_query   s    
z&DatabaseOperations.last_executed_queryc                 C   s    | dr|dr|S d| S )N"z"%s")
startswithendswith)r   namer   r   r   
quote_name   s    zDatabaseOperations.quote_namec                 C   s   dS )Nr   r=   r   r   r   no_limit_value   s    z!DatabaseOperations.no_limit_valuec              
   C   sN   d}|ddf}| j  ,}|||}dd | D 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   .0rowr   r   r   
<listcomp>   s     z9DatabaseOperations.__references_graph.<locals>.<listcomp>)r   rC   rE   Zfetchall)r   Z
table_namequeryrF   rC   rG   r   r   r   Z__references_graph   s    
z%DatabaseOperations.__references_graphc                 C   s   t dd| jS )Ni   )maxsize)r   %_DatabaseOperations__references_graphr=   r   r   r   _references_graph   s    z$DatabaseOperations._references_graphF)reset_sequencesallow_cascadec                   s`   |r$|r$t t fdd|D } fdd|D }|r\dd |D }| | |S )Nc                 3   s   | ]}  |V  qd S rJ   )r_   rY   tabler=   r   r   	<genexpr>   s     z/DatabaseOperations.sql_flush.<locals>.<genexpr>c              
      s2   g | ]*}d  d d |f qS )z	%s %s %s;DELETEZFROM)SQL_KEYWORD	SQL_FIELDrU   rb   r   styler   r   r[      s   z0DatabaseOperations.sql_flush.<locals>.<listcomp>c                 S   s   g | ]}d |iqS )rc   r   rb   r   r   r   r[      s     )setr   from_iterableextendsequence_reset_by_name_sql)r   ri   Ztablesr`   ra   r+   	sequencesr   rh   r   	sql_flush   s    zDatabaseOperations.sql_flushc                 C   sn   |sg S d| d|| d| d|| d| d|| d| dd	d
d |D f gS )Nz%s %s %s %s = 0 %s %s %s (%s);ZUPDATEZsqlite_sequenceZSETseqZWHERErT   INr?   c                 S   s   g | ]}d |d  qS )r3   rc   r   )rY   Zsequence_infor   r   r   r[      s    zADatabaseOperations.sequence_reset_by_name_sql.<locals>.<listcomp>)rf   Z	SQL_TABLErU   rg   rB   )r   ri   rn   r   r   r   rm      s    
z-DatabaseOperations.sequence_reset_by_name_sqlc                 C   sL   |d krd S t |dr|S t|rDtjr<t|| jj}ntdt|S )Nresolve_expressionzNSQLite backend does not support timezone-aware datetimes when USE_TZ is False.)	hasattrr   is_awarer   r5   Z
make_naiver   
ValueErrorstrr   valuer   r   r   adapt_datetimefield_value   s    

z,DatabaseOperations.adapt_datetimefield_valuec                 C   s4   |d krd S t |dr|S t|r,tdt|S )Nrr   z5SQLite backend does not support timezone-aware times.)rs   r   rt   ru   rv   rw   r   r   r   adapt_timefield_value   s    

z(DatabaseOperations.adapt_timefield_valuec                    s   t  |}|j }|dkr,|| j np|dkrB|| j nZ|dkrX|| j nD|dkrr|| | n*|dkr|| j	 n|dkr|| j
 |S )Nr   r   r   ZDecimalFieldZ	UUIDField)ZNullBooleanFieldZBooleanField)superget_db_convertersr    Zget_internal_typeappendconvert_datetimefield_valueconvert_datefield_valueconvert_timefield_valueget_decimalfield_converterconvert_uuidfield_valueconvert_booleanfield_value)r   r"   
convertersinternal_type	__class__r   r   r|     s    
z$DatabaseOperations.get_db_convertersc                 C   s@   |d k	r<t |tjst|}tjr<t|s<t|| jj}|S rJ   )	r   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st|}|S rJ   )r   r   dater   r   r   r   r   r   $  s    z*DatabaseOperations.convert_datefield_valuec                 C   s    |d k	rt |tjst|}|S rJ   )r   r   timer   r   r   r   r   r   *  s    z*DatabaseOperations.convert_timefield_valuec                    sN   t jddj t|tr>t d|jj  fdd}n fdd}|S )N   )precr   c                    s"   | d k	r | j |jjdS d S )N)context)quantizer    r   rx   r"   r   create_decimalZquantize_valuer   r   	converter7  s    z@DatabaseOperations.get_decimalfield_converter.<locals>.converterc                    s   | d k	r | S d S rJ   r   r   )r   r   r   r   ;  s    )	decimalContextcreate_decimal_from_floatr   r
   Decimalscalebr    Zdecimal_places)r   r"   r   r   r   r   r   0  s    
z-DatabaseOperations.get_decimalfield_converterc                 C   s   |d k	rt |}|S rJ   )uuidUUIDr   r   r   r   r   @  s    
z*DatabaseOperations.convert_uuidfield_valuec                 C   s   |dkrt |S |S )N)r   r   )boolr   r   r   r   r   E  s    z-DatabaseOperations.convert_booleanfield_valuec                 C   s   d dd |D S )Nz UNION ALL c                 s   s   | ]}d d | V  qdS )z	SELECT %sr?   NrB   rX   r   r   r   rd   I  s   z5DatabaseOperations.bulk_insert_sql.<locals>.<genexpr>r   )r   r   Zplaceholder_rowsr   r   r   bulk_insert_sqlH  s    
z"DatabaseOperations.bulk_insert_sqlc                    s:   |dkrdd | S |dkr,dd | S t ||S )N^z	POWER(%s),#z
BITXOR(%s))rB   r{   combine_expression)r   	connectorsub_expressionsr   r   r   r   N  s
    z%DatabaseOperations.combine_expressionc                 C   sD   |dkrt d| d| g| }t|dkr6tddd| S )N)+-z$Invalid connector for timedelta: %s.r3      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   combine_duration_expressionW  s    z.DatabaseOperations.combine_duration_expressionc                 C   s   dS )N)NNr   )r   r   r   r   r   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   lhsrhsZlhs_sqlZ
lhs_paramsZrhs_sqlZ
rhs_paramsrF   r   r   r   subtract_temporalsc  s    z%DatabaseOperations.subtract_temporalsc                    s   |rdS t  |S )NzINSERT OR IGNORE INTO)r{   insert_statement)r   Zignore_conflictsr   r   r   r   k  s    z#DatabaseOperations.insert_statement)N)N)F),__name__
__module____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   r   r   r   r   r   r   r   __classcell__r   r   r   r   r      sT   


	r   )r   r   r   	functoolsr   	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   <module>   s   