U
    R+|jµ_  ã                   @   s|   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
 d dlmZ d dlmZ d d	lmZ G d
d„ deƒZdS )é    N)ÚDecimal)ÚApps)ÚNotSupportedError)ÚBaseDatabaseSchemaEditor)Ú	Statement)Ústrip_quotes)ÚUniqueConstraint)Úatomicc                       sä   e Zd ZdZdZdZeZdZdZdZ	dZ
dZ‡ fdd„Z‡ fd	d
„Zdd„ Zdd„ Zd)dd„Zd*‡ fdd„	Zd+‡ fdd„	Zd,dd„Zd-‡ fdd„	Z‡ fdd„Z‡ fdd„Zd.dd „Zd!d"„ Z‡ fd#d$„Z‡ fd%d&„Zd'd(„ Z‡  ZS )/ÚDatabaseSchemaEditorzDROP TABLE %(table)sNzEREFERENCES %(to_table)s (%(to_column)s) DEFERRABLE INITIALLY DEFERREDz,ALTER TABLE %(table)s DROP COLUMN %(column)sz7CREATE UNIQUE INDEX %(name)s ON %(table)s (%(columns)s)zDROP INDEX %(name)sc                    s   | j  ¡ stdƒ‚tƒ  ¡ S )NzüSQLite schema editor cannot be used while foreign key constraint checks are enabled. Make sure to disable them before entering a transaction.atomic() context because SQLite does not support disabling them in the middle of a multi-statement transaction.)Ú
connectionÚdisable_constraint_checkingr   ÚsuperÚ	__enter__©Úself©Ú	__class__© úic:\users\snmko\desktop\web_content\django_cbt\venv\Lib\site-packages\django/db/backends/sqlite3/schema.pyr      s
    
ÿzDatabaseSchemaEditor.__enter__c                    s(   | j  ¡  tƒ  |||¡ | j  ¡  d S ©N)r   Zcheck_constraintsr   Ú__exit__Úenable_constraint_checking)r   Úexc_typeÚ	exc_valueÚ	tracebackr   r   r   r   '   s    
zDatabaseSchemaEditor.__exit__c                 C   sÈ   zdd l }| |¡}W n( tk
r*   Y n |jk
r>   Y nX t|tƒrVtt|ƒƒS t|tt	tfƒrnt|ƒS t|tƒrˆd| 
dd¡ S |d kr”dS t|tttfƒr°d| ¡  S td|t|ƒf ƒ‚d S )Nr   z'%s'ú'z''ÚNULLzX'%s'z*Cannot quote parameter value %r of type %s)Úsqlite3ZadaptÚImportErrorZProgrammingErrorÚ
isinstanceÚboolÚstrÚintr   ÚfloatÚreplaceÚbytesÚ	bytearrayÚ
memoryviewÚhexÚ
ValueErrorÚtype)r   Úvaluer   r   r   r   Úquote_value,   s(    

ÿz DatabaseSchemaEditor.quote_valuec                 C   s
   |   |¡S r   )r,   )r   r+   r   r   r   Úprepare_defaultK   s    z$DatabaseSchemaEditor.prepare_defaultFc           	   	   C   sŒ   | j  ¡ �x}| j j |¡D ]b}|r.|j|kr.q| j j ||j¡}| ¡ D ]2\}}||krH|dksh||krH  W 5 Q R £ dS qHqW 5 Q R X dS )a  
        Return whether or not the provided table name is referenced by another
        one. If `column_name` is specified, only references pointing to that
        column are considered. If `ignore_self` is True, self-referential
        constraints are ignored.
        NTF)r   ÚcursorZintrospectionZget_table_listÚnameZget_relationsÚvalues)	r   Ú
table_nameZcolumn_nameÚignore_selfr.   Zother_tableZ	relationsZconstraint_columnZconstraint_tabler   r   r   Ú_is_referenced_by_fk_constraintN   s     	 ÿÿÿ z4DatabaseSchemaEditor._is_referenced_by_fk_constraintTc                    sf   | j jjsR|rR|  |¡rR| j jr,td| ƒ‚| j  ¡  tƒ  |||¡ | j  	¡  ntƒ  |||¡ d S )Nz°Renaming the %r table while in a transaction is not supported on SQLite < 3.26 because it would break referential integrity. Try adding `atomic = False` to the Migration class.)
r   ÚfeaturesÚ!supports_atomic_references_renamer3   Úin_atomic_blockr   r   r   Úalter_db_tabler   )r   ÚmodelZold_db_tableZnew_db_tableÚdisable_constraintsr   r   r   r7   e   s     ÿþýûÿ
z#DatabaseSchemaEditor.alter_db_tablec              
      sb  |   ||¡sd S |j}|jj}| ¡ \}}|j|k�rJ| jjj�sJ| j||dd��rJ| jj	rpt
d|jj|f ƒ‚t| jjƒ�¦ tƒ j||||d� | j ¡ �|}	|	 d¡ ¡ d }
|	 d¡ d| }| ¡ d	 }|| }|| }|	 d
||f¡ |	 d|
d	  ¡ |	 d¡ |	 d¡ W 5 Q R X W 5 Q R X | j ¡ �}	|	 d¡ W 5 Q R X ntƒ j||||d� d S )NT)r2   z´Renaming the %r.%r column while in a transaction is not supported on SQLite < 3.26 because it would break referential integrity. Try adding `atomic = False` to the Migration class.)ÚstrictzPRAGMA schema_versionr   zPRAGMA writable_schema = 1z REFERENCES "%s" ("%%s") é   z3UPDATE sqlite_master SET sql = replace(sql, %s, %s)zPRAGMA schema_version = %dzPRAGMA writable_schema = 0zPRAGMA integrity_checkZVACUUM)Z_field_should_be_alteredr/   Ú_metaÚdb_tableZget_attname_columnr   r4   r5   r3   r6   r   r	   Úaliasr   Úalter_fieldr.   ÚexecuteZfetchone)r   r8   Ú	old_fieldÚ	new_fieldr:   Zold_field_namer1   Ú_Zold_column_namer.   Zschema_versionZreferences_templateZnew_column_nameÚsearchÚreplacementr   r   r   r?   |   sT    ÿþ  ÿý
ûÿÿ
þ
z DatabaseSchemaEditor.alter_fieldc              	      sr  ‡fdd„‰‡fdd„ˆj jD ƒ}‡fdd„ˆj jD ƒ}i ‰d}|pFg }t|ddƒsftd	d
„ |D ƒƒr¶t| ¡ ƒD ]B\‰}|jrrt‡fdd
„|D ƒƒsrd|_|}|jrr|ˆ= ||j= qr|ræ|||j	< |j
sæ|jræˆ ˆ |¡¡||j< |D ]Ž}	|	\}
}| |
j	d¡ | |
jd¡ |||j	< |
j�rZ|j�sZdˆ |
j¡ˆ ˆ |¡¡dœ }|||j< nˆ |
j¡||j< |j	ˆ|
j	< qêˆ �r´|ˆ j	= |ˆ j= ˆ j
�r´ˆ jjj j�r´ˆ ˆ jj¡S tƒ }‡fdd„ˆj jD ƒ}‡fdd„ˆj jD ƒ}ˆj j}ˆ �r‡ fdd„|D ƒ}tˆj jƒ}t |¡}ˆj jˆj j|||||dœ}tdd|ƒ}||d< ˆj|d< tˆj jˆj |ƒ t |¡}ˆj jdt!ˆj jƒ |||||dœ}tdd|ƒ}||d< ˆj|d< tdˆj j ˆj |ƒ}ˆ "|¡ ˆ #dˆ |j j¡d $‡fdd
„|D ƒ¡d $| %¡ ¡ˆ ˆj j¡f ¡ ˆjˆdd� ˆj&||j jˆj jdd� ˆj'D ]}ˆ #|¡ �qJg ˆ_'|�rnd|_dS )a|  
        Shortcut to transform a model from old_model into new_model

        This follows the correct procedure to perform non-rename or column
        addition operations based on SQLite's documentation

        https://www.sqlite.org/lang_altertable.html#caution

        The essential steps are:
          1. Create a table with the updated definition called "new__app_model"
          2. Copy the data from the existing "app_model" table to the new table
          3. Drop the "app_model" table
          4. Rename the "new__app_model" table to "app_model"
          5. Restore any index of the previous "app_model" table.
        c                    s   | j o| jjˆ kS r   )Zis_relationÚremote_fieldr8   )Úf)r8   r   r   Úis_self_referentialÇ   s    z?DatabaseSchemaEditor._remake_table.<locals>.is_self_referentialc                    s$   i | ]}|j ˆ |ƒr| ¡ n|“qS r   )r/   Úclone©Ú.0rG   )rH   r   r   Ú
<dictcomp>Ë   s   ÿ z6DatabaseSchemaEditor._remake_table.<locals>.<dictcomp>c                    s   i | ]}|j ˆ  |j ¡“qS r   )ÚcolumnÚ
quote_namerJ   r   r   r   rL   Ñ   s   ÿ NÚprimary_keyFc                 s   s   | ]\}}t |d dƒV  qdS )rO   FN)Úgetattr©rK   rC   rB   r   r   r   Ú	<genexpr>Û   s    z5DatabaseSchemaEditor._remake_table.<locals>.<genexpr>c                 3   s   | ]\}}ˆ |j kV  qd S r   ©r/   rQ   rS   r   r   rR   ß   s   ÿzcoalesce(%(col)s, %(default)s))ÚcolÚdefaultc                    s   g | ]}‡ fd d„|D ƒ‘qS )c                    s   g | ]}ˆ   ||¡‘qS r   ©Úget©rK   Ún©Úrename_mappingr   r   Ú
<listcomp>  s     úADatabaseSchemaEditor._remake_table.<locals>.<listcomp>.<listcomp>r   )rK   ÚuniquerZ   r   r   r\     s   ÿz6DatabaseSchemaEditor._remake_table.<locals>.<listcomp>c                    s   g | ]}‡ fd d„|D ƒ‘qS )c                    s   g | ]}ˆ   ||¡‘qS r   rV   rX   rZ   r   r   r\     s     r]   r   ©rK   ÚindexrZ   r   r   r\     s   ÿc                    s   g | ]}ˆ j |jkr|‘qS r   )r/   Úfieldsr_   ©Údelete_fieldr   r   r\     s     )Ú	app_labelr=   Úunique_togetherÚindex_togetherÚindexesÚconstraintsÚappsZMetar   Ú
__module__znew__%szNew%sú%INSERT INTO %s (%s) SELECT %s FROM %sú, c                 3   s   | ]}ˆ   |¡V  qd S r   )rN   )rK   Úxr   r   r   rR   T  s     )Úhandle_autom2m)r9   T)(r<   Zlocal_concrete_fieldsrP   ÚanyÚlistÚitemsrO   Úauto_createdrM   r/   Úmany_to_manyZconcreter-   Úeffective_defaultÚpopÚnullrN   rF   ÚthroughÚdelete_modelr   re   rf   rg   rh   ÚcopyÚdeepcopyrd   r=   r*   rj   Zobject_nameÚ	__bases__r   Úcreate_modelr@   Újoinr0   r7   Údeferred_sql)r   r8   Úcreate_fieldrc   Úalter_fieldsÚbodyÚmappingZrestore_pk_fieldÚfieldr?   rA   rB   Zcase_sqlri   re   rf   rg   rh   Z	body_copyZmeta_contentsÚmetaZ	new_modelÚsqlr   )rc   rH   r8   r/   r[   r   r   Ú_remake_table±   sÜ    
þ
þÿü

ÿ


þÿ
þ
þ
þ
ÿ
ù	

ù	

üÿÿü
z"DatabaseSchemaEditor._remake_tablec                    sh   |rt ƒ  |¡ nR|  | jd|  |jj¡i ¡ t| jƒD ](}t	|t
ƒr:| |jj¡r:| j |¡ q:d S )NÚtable)r   rx   r@   Úsql_delete_tablerN   r<   r=   rp   r~   r   r   Zreferences_tableÚremove)r   r8   rn   r…   r   r   r   rx   m  s     ÿÿÿÿz!DatabaseSchemaEditor.delete_modelc                    sd   |j r"|jjjjr"|  |jj¡ n>|jsB|jsB|jrB|  	|¡dk	rR| j
||d� ntƒ  ||¡ dS )zCreate a field on a model.N)r   )rs   rF   rw   r<   rr   r|   rO   r^   rv   rt   r†   r   Ú	add_field©r   r8   rƒ   r   r   r   rŠ     s    ýü	÷
özDatabaseSchemaEditor.add_fieldc                    s†   |j r"|jjjjr‚|  |jj¡ n`| jjjrZ|j	sZ|j
sZ|jsZ|jrJ|jsZtƒ  ||¡ n(|j| jd�d dkrtdS | j||d� dS )z…
        Remove a field from a model. Usually involves deleting a column,
        but for M2Ms may involve deleting a table.
        )r   r*   Nrb   )rs   rF   rw   r<   rr   rx   r   r4   Zcan_alter_table_drop_columnrO   r^   Zdb_indexÚdb_constraintr   Úremove_fieldZdb_parametersr†   r‹   r   r   r   r�   ”  s&    ÿüûúùù	z!DatabaseSchemaEditor.remove_fieldc	                 C   s`  | j jjr`|j|jkr`|  ||¡|  ||¡kr`|jr:|js`|jrF|js`|  |  |j	j
|||¡¡S | j|||fgd� | d¡}	| d¡}
|j�r\||ks¢|	|
k�r\tƒ }|jj	}|jD ]L}|j|krÆq¶|jsæ|j|jkrä| |j¡ q¶|jr¶|jj	jr¶| |j¡ q¶|j�rF|jD ]2}|j|k�r&�q|jjj	j�r| |jj¡ �q|D ]}|  |¡ �qJdS )z3Perform a "physical" (non-ManyToMany) field update.©r€   Ú	collationN)r   r4   Zcan_alter_table_rename_columnrM   Z
column_sqlrF   rŒ   r@   Z_rename_field_sqlr<   r=   r†   rW   r^   Úsetr8   Zrelated_objectsÚrelated_modelrs   Ú
field_namer/   ÚaddrO   rw   rr   )r   r8   rA   rB   Zold_typeÚnew_typeZold_db_paramsZnew_db_paramsr:   Zold_collationZnew_collationZrelated_modelsÚoptsrF   rs   r‘   r   r   r   Ú_alter_field°  s`    ÿ
þýûúùø   ÿÿ

ÿÿ


z!DatabaseSchemaEditor._alter_fieldc                 C   sô   |j jjj|j jjjkrz| j|j j|j jj | ¡ ¡|j jj | ¡ ¡f|j jj | ¡ ¡|j jj | ¡ ¡fgd� dS |  |j j¡ |  	d|  
|j jjj¡d d| ¡ | ¡ g¡d d| ¡ | ¡ g¡|  
|j jjj¡f ¡ |  |j j¡ dS )z*Alter M2Ms to repoint their to= endpoints.rŽ   Nrk   rl   Úid)rF   rw   r<   r=   r†   Ú	get_fieldZm2m_reverse_field_nameZm2m_field_namer|   r@   rN   r}   Zm2m_column_nameZm2m_reverse_namerx   )r   r8   rA   rB   r:   r   r   r   Ú_alter_many_to_manyë  sX    

ÿÿ
ÿ
ÿù
ÿ
ÿùôþýÿýÿðÿÿz(DatabaseSchemaEditor._alter_many_to_manyc                    s@   t |tƒr2|js"|js"|js"|jr2tƒ  ||¡ n
|  |¡ d S r   )	r   r   Ú	conditionÚcontains_expressionsÚincludeÚ
deferrabler   Úadd_constraintr†   ©r   r8   Ú
constraintr   r   r   rž   +  s    
ÿþýüz#DatabaseSchemaEditor.add_constraintc                    s@   t |tƒr2|js"|js"|js"|jr2tƒ  ||¡ n
|  |¡ d S r   )	r   r   rš   r›   rœ   r�   r   Úremove_constraintr†   rŸ   r   r   r   r¡   6  s    
ÿþýüz&DatabaseSchemaEditor.remove_constraintc                 C   s   d| S )NzCOLLATE r   )r   r�   r   r   r   Ú_collate_sqlA  s    z!DatabaseSchemaEditor._collate_sql)NF)T)F)NNN)T)F)Ú__name__rj   Ú__qualname__rˆ   Zsql_create_fkZsql_create_inline_fkZsql_create_column_inline_fkZsql_delete_columnZsql_create_uniqueZsql_delete_uniqueZsql_alter_table_commentZsql_alter_column_commentr   r   r,   r-   r3   r7   r?   r†   rx   rŠ   r�   r–   r™   rž   r¡   r¢   Ú__classcell__r   r   r   r   r
      sD   ÿ   ÿ
 ÿ6     ÿ
 =% ÷
;@r
   )ry   Údecimalr   Zdjango.apps.registryr   Z	django.dbr   Zdjango.db.backends.base.schemar   Z!django.db.backends.ddl_referencesr   Zdjango.db.backends.utilsr   Zdjango.db.modelsr   Zdjango.db.transactionr	   r
   r   r   r   r   Ú<module>   s   