o
    ×ŸŽiAB  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 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
OnConflict)ÚCol)Útimezone)Ú
parse_dateÚparse_datetimeÚ
parse_time)Úcached_propertyc                       sˆ  e Zd ZdZdddœZdZeg d¢ƒZdd„ Zdd	„ Z	d
d„ Z
dd„ Zdd„ ZdWdd„ZdWd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$„ Zd%d&„ Zd'd(„ Zd)d*„ Zd+d,„ Zed-d.„ ƒZd/d/d0œd1d2„Zd3d4„ Zd5d6„ Zd7d8„ Z ‡ fd9d:„Z!d;d<„ Z"d=d>„ Z#d?d@„ Z$dAdB„ Z%dCdD„ Z&dEdF„ Z'dGdH„ Z(‡ fdIdJ„Z)dKdL„ Z*dMdN„ Z+dOdP„ Z,dW‡ fdQdR„	Z-dSdT„ Z.‡ fdUdV„Z/‡  Z0S )XÚDatabaseOperationsÚtextZTEXT)Ú	DateFieldÚDateTimeFieldzEXPLAIN QUERY PLAN)ÚnullÚfalseÚtruec                 C   s6   t |ƒdkrdS t |ƒdkr| jjjt |ƒ S t |ƒ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   úoC:\Users\psant\Downloads\Anu Raj Backend\school\venv\Lib\site-packages\django/db/backends/sqlite3/operations.pyÚ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||ƒr8| 	¡ D ]}z|j
}W n ttfy-   Y qw t||ƒr7tdƒ‚qt|t jƒrL|jrNt|jƒdkrPtdƒ‚d S d S 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,   s0   

ý
ÿÿ
ÿþýÿûz+DatabaseOperations.check_expression_supportc                 C   ó   d|› d�|  ¡ g|¢R 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, ú)N©Úlower©r   Úlookup_typeÚsqlÚparamsr   r   r    Údate_extract_sqlH   s   z#DatabaseOperations.date_extract_sqlc                 C   s   |  ¡ S )z—
        Given a cursor object that has just performed an INSERT...RETURNING
        statement into a table, return the list of returned data.
        N)Úfetchall)r   Úcursorr   r   r    Úfetch_returned_insert_rowsP   s   z-DatabaseOperations.fetch_returned_insert_rowsc                 C   s   |S )z>Do nothing since formatting is handled in the custom function.Nr   )r   r/   r   r   r    Úformat_for_duration_arithmeticW   ó   z1DatabaseOperations.format_for_duration_arithmeticNc                 C   ó&   d|› d�|  ¡ g|¢|  |¡¢R fS )Nzdjango_date_trunc(%s, ú	, %s, %s)©r,   Ú_convert_tznames_to_sql©r   r.   r/   r0   Útznamer   r   r    Údate_trunc_sql[   ó   
ÿþýz!DatabaseOperations.date_trunc_sqlc                 C   r7   )Nzdjango_time_trunc(%s, r8   r9   r;   r   r   r    Útime_trunc_sqlb   r>   z!DatabaseOperations.time_trunc_sqlc                 C   s   |rt jr|| jjfS dS ©N)NN)r   ÚUSE_TZr   Ztimezone_name)r   r<   r   r   r    r:   i   s   
z*DatabaseOperations._convert_tznames_to_sqlc                 C   ó    d|› d�g |¢|   |¡¢R fS )Nzdjango_datetime_cast_date(r8   ©r:   ©r   r/   r0   r<   r   r   r    Údatetime_cast_date_sqln   ó
   ÿþz)DatabaseOperations.datetime_cast_date_sqlc                 C   rB   )Nzdjango_datetime_cast_time(r8   rC   rD   r   r   r    Údatetime_cast_time_sqlt   rF   z)DatabaseOperations.datetime_cast_time_sqlc                 C   r7   )Nzdjango_datetime_extract(%s, r8   r9   r;   r   r   r    Údatetime_extract_sqlz   r>   z'DatabaseOperations.datetime_extract_sqlc                 C   r7   )Nzdjango_datetime_trunc(%s, r8   r9   r;   r   r   r    Údatetime_trunc_sql�   r>   z%DatabaseOperations.datetime_trunc_sqlc                 C   r)   )Nzdjango_time_extract(%s, r*   r+   r-   r   r   r    Útime_extract_sqlˆ   s   z#DatabaseOperations.time_extract_sqlc                 C   ó   dS )NÚNULLr   ©r   r   r   r    Úpk_default_value‹   ó   z#DatabaseOperations.pk_default_valuec                 C   s–   d}t |ƒ|kr&d}tdt |ƒ|ƒD ]}|||| … }||  |¡7 }q|S dd dgt |ƒ ¡ }| jj ¡ }z| ||¡ ¡ W | ¡  S | ¡  w )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   r3   ÚexecuteZfetchoneÚclose)r   r0   Z
BATCH_SIZEÚresultsÚindexÚchunkr/   r3   r   r   r    rR   Ž   s   	z8DatabaseOperations._quote_params_for_last_executed_queryc                 C   sT   |r(t |ttfƒr|  |¡}|| S t| ¡ ƒ}|  |¡}tt||ƒƒ}|| S |S ©N)r#   ÚlistÚtuplerR   ÚvaluesÚdictÚzip)r   r3   r/   r0   r\   r   r   r    Úlast_executed_query©   s   
ý
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   rK   )Néÿÿÿÿr   rM   r   r   r    Úno_limit_valueÀ   rO   z!DatabaseOperations.no_limit_valuec                 C   sZ   d}|ddf}| j  ¡ �}| ||¡}dd„ | ¡ D ƒW  d   ƒ S 1 s&w   Y  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>Ô   ó    z9DatabaseOperations.__references_graph.<locals>.<listcomp>)r   r3   rT   r2   )r   Z
table_nameÚqueryr0   r3   rV   r   r   r    Z__references_graphÃ   s   
ý$þz%DatabaseOperations.__references_graphc                 C   s   t dd�| jƒS )Ni   )Úmaxsize)r   Ú%_DatabaseOperations__references_graphrM   r   r   r    Ú_references_graphÖ   s   z$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 rY   )ro   ©rh   ÚtablerM   r   r    Ú	<genexpr>á   ó   € 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_FIELDrd   rr   ©r   Ústyler   r    rj   ã   s    úýÿÿz0DatabaseOperations.sql_flush.<locals>.<listcomp>c                 S   s   g | ]}d |i‘qS )rs   r   rr   r   r   r    rj   í   rk   )Úsetr   Úfrom_iterableÚextendÚsequence_reset_by_name_sql)r   rz   Ztablesrp   rq   r/   Ú	sequencesr   ry   r    Ú	sql_flushÜ   s   ÿù	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);ÚUPDATEZsqlite_sequenceZSETÚseqZWHERErc   ÚINrP   c                 S   s   g | ]}d |d  ‘qS )ú'%s'rs   r   )rh   Zsequence_infor   r   r    rj   ÿ   s    zADatabaseOperations.sequence_reset_by_name_sql.<locals>.<listcomp>)rw   Z	SQL_TABLErd   rx   rS   )r   rz   r   r   r   r    r~   ñ   s    ÿøÿÿz-DatabaseOperations.sequence_reset_by_name_sqlc                 C   sR   |d u rd S t |dƒr|S t |¡r%tjr!t || jj¡}t|ƒS 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   rA   Z
make_naiver   Ú
ValueErrorÚstr©r   Úvaluer   r   r    Úadapt_datetimefield_value  s   

ûÿz,DatabaseOperations.adapt_datetimefield_valuec                 C   s4   |d u rd S t |dƒr|S t |¡rtdƒ‚t|ƒS )Nr…   z5SQLite backend does not support timezone-aware times.)r†   r   r‡   rˆ   r‰   rŠ   r   r   r    Úadapt_timefield_value  s   

z(DatabaseOperations.adapt_timefield_valuec                    sª   t ƒ  |¡}|j ¡ }|dkr| | j¡ |S |dkr#| | j¡ |S |dkr/| | j¡ |S |dkr=| |  |¡¡ |S |dkrI| | j	¡ |S |dkrS| | j
¡ |S )Nr   r   r"   ZDecimalFieldZ	UUIDFieldZBooleanField)ÚsuperÚget_db_convertersr$   Zget_internal_typeÚappendÚconvert_datetimefield_valueÚconvert_datefield_valueÚconvert_timefield_valueÚget_decimalfield_converterÚconvert_uuidfield_valueÚconvert_booleanfield_value)r   r&   Ú
convertersÚinternal_type©Ú	__class__r   r    r�   &  s(   
ö	øúüþz$DatabaseOperations.get_db_convertersc                 C   s@   |d urt |tjƒst|ƒ}tjrt |¡st || jj¡}|S rY   )	r#   Údatetimer   r   rA   r   r‡   Z
make_awarer   ©r   r‹   r&   r   r   r   r    r‘   7  s   z.DatabaseOperations.convert_datetimefield_valuec                 C   ó    |d urt |tjƒst|ƒ}|S rY   )r#   r›   Údater   rœ   r   r   r    r’   ?  ó   z*DatabaseOperations.convert_datefield_valuec                 C   r�   rY   )r#   r›   Útimer   rœ   r   r   r    r“   E  rŸ   z*DatabaseOperations.convert_timefield_valuec                    sP   t jdd�j‰ t|tƒr t  d¡ |jj ¡‰‡ ‡fdd„}|S ‡ fdd„}|S )Né   )Úprecr   c                    s"   | d urˆ | ƒj ˆ|jjd�S d S )N)Úcontext)Úquantizer$   r£   ©r‹   r&   r   ©Úcreate_decimalZquantize_valuer   r    Ú	converterT  s
   ÿÿz@DatabaseOperations.get_decimalfield_converter.<locals>.converterc                    s   | d urˆ | ƒS d S rY   r   r¥   )r§   r   r    r¨   \  s   ÿ)	ÚdecimalÚContextÚcreate_decimal_from_floatr#   r   ÚDecimalÚscalebr$   Zdecimal_places)r   r&   r¨   r   r¦   r    r”   K  s   

ÿüz-DatabaseOperations.get_decimalfield_converterc                 C   s   |d ur	t  |¡}|S rY   )ÚuuidÚUUIDrœ   r   r   r    r•   b  s   
z*DatabaseOperations.convert_uuidfield_valuec                 C   s   |dv rt |ƒS |S )N)r   r   )Úboolrœ   r   r   r    r–   g  s   z-DatabaseOperations.convert_booleanfield_valuec                 C   s,   dd„ |D ƒ}d  dd„ |D ƒ¡}d|› �S )Nc                 s   s   � | ]}d   |¡V  qdS )rP   N©rS   rg   r   r   r    rt   k  ru   z5DatabaseOperations.bulk_insert_sql.<locals>.<genexpr>rP   c                 s   s   � | ]	}d |› d�V  qdS )ú(r*   Nr   )rh   r/   r   r   r    rt   l  s   € zVALUES r±   )r   r   Zplaceholder_rowsZplaceholder_rows_sqlZ
values_sqlr   r   r    Úbulk_insert_sqlj  s   
z"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))rS   rŽ   Úcombine_expression)r   Ú	connectorÚsub_expressionsr™   r   r    r·   o  s
   z%DatabaseOperations.combine_expressionc                 C   sD   |dvr
t d| ƒ‚d| g| }t|ƒdkrtdƒ‚dd |¡ S )N)ú+ú-Ú*ú/z$Invalid connector for timedelta: %s.r„   é   z)Too many params for timedelta operations.zdjango_format_dtdelta(%s)rP   )r   r   rˆ   rS   )r   r¸   r¹   Z	fn_paramsr   r   r    Úcombine_duration_expressionx  s   z.DatabaseOperations.combine_duration_expressionc                 C   rK   r@   r   )r   r˜   r   r   r    Úinteger_field_range€  r6   z&DatabaseOperations.integer_field_rangec           	      C   sF   |\}}|\}}g |¢|¢R }|dkrd||f |fS d||f |fS )Nr"   zdjango_time_diff(%s, %s)zdjango_timestamp_diff(%s, %s)r   )	r   r˜   ÚlhsÚrhsZlhs_sqlZ
lhs_paramsZrhs_sqlZ
rhs_paramsr0   r   r   r    Úsubtract_temporals„  s   z%DatabaseOperations.subtract_temporalsc                    s   |t jkrdS tƒ j|d�S )NzINSERT OR IGNORE INTO)Úon_conflict)r
   ZIGNORErŽ   Úinsert_statement)r   rÄ   r™   r   r    rÅ   Œ  s   
z#DatabaseOperations.insert_statementc                    s,   |sdS ‡ fdd„|D ƒ}dd  |¡ dfS )N)Ú r   c                    s,   g | ]}d ˆ   |jjj¡ˆ   |j¡f ‘qS )z%s.%s)rd   ÚmodelZ_metaZdb_tableÚcolumn©rh   ÚfieldrM   r   r    rj   •  s    û
þÿÿz<DatabaseOperations.return_insert_columns.<locals>.<listcomp>zRETURNING %srP   r   r±   )r   r   Úcolumnsr   rM   r    Úreturn_insert_columns‘  s   
úz(DatabaseOperations.return_insert_columnsc                    sX   |t jkr#| jjjr#dd t| j|ƒ¡d dd„ t| j|ƒD ƒ¡f S tƒ  	||||¡S )Nz ON CONFLICT(%s) DO UPDATE SET %srP   c                 S   s   g | ]	}|› d |› �‘qS )z = EXCLUDED.r   rÉ   r   r   r    rj   §  s    ÿÿz=DatabaseOperations.on_conflict_suffix_sql.<locals>.<listcomp>)
r
   r�   r   r   Z%supports_update_conflicts_with_targetrS   Úmaprd   rŽ   Úon_conflict_suffix_sql)r   r   rÄ   Zupdate_fieldsZunique_fieldsr™   r   r    rÎ   Ÿ  s$   ÿþ
þÿþ	üz)DatabaseOperations.on_conflict_suffix_sqlrY   )1Ú__name__Ú
__module__Ú__qualname__Z"cast_char_field_without_max_lengthZcast_data_typesZexplain_prefixÚ	frozensetZjsonfield_datatype_valuesr!   r(   r1   r4   r5   r=   r?   r:   rE   rG   rH   rI   rJ   rN   rR   r_   rd   rf   rn   r   ro   r€   r~   rŒ   r�   r�   r‘   r’   r“   r”   r•   r–   r³   r·   r¿   rÀ   rÃ   rÅ   rÌ   rÎ   Ú__classcell__r   r   r™   r    r      s^    þ


	r   )r›   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.constantsr
   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    