U
    d                    @   s   d dl Z d dlZd dlmZ d dlmZ d dlmZmZmZm	Z	m
Z
mZ d dlmZmZ d dlmZmZ d dlmZ d dlmZmZ d d	lmZ e d
Zdd Zdd Zdd ZG dd dZdS )    N)datetime)settings)ColumnsExpressionsForeignKeyName	IndexName	StatementTable)names_digestsplit_identifier)
DeferrableIndex)Query)TransactionManagementErroratomic)timezonezdjango.db.backends.schemac                 C   s2   | j }|jrdS |jr&|jdgkr&dS |j|jkS )zz
    When altering the given field, must constraints on its model from the given
    relation be temporarily dropped?
    FNT)fieldmany_to_manyprimary_keyZ	to_fieldsname)ZrelationZaltered_fieldr    r   B/tmp/pip-unpacked-wheel-7vj2equ7/django/db/backends/base/schema.py_is_relevant_relation   s    r   c                 C   s"   t | jjdddddtddS )NFT)ZforwardreverseZinclude_hiddenZinclude_parentsr   )key)sorted_metaZ_get_fieldsoperator
attrgettermodelr   r   r   _all_related_fields'   s    r!   c                 #   sb   t fddtjD  fddt jD }|D ]&\}}||fV  t|j|jE d H  q6d S )Nc                 3   s   | ]}t | r|V  qd S Nr   .0obj)	old_fieldr   r   	<genexpr>8   s   
z+_related_non_m2m_objects.<locals>.<genexpr>c                 3   s   | ]}t | r|V  qd S r"   r#   r$   )	new_fieldr   r   r(   =   s   
)zipr!   r    _related_non_m2m_objectsremote_field)r'   r)   Zrelated_fieldsold_relnew_relr   )r)   r'   r   r+   4   s    


r+   c                   @   s  e Zd ZdZdZdZdZdZdZdZ	dZ
d	Zd
ZdZdZeZdZdZdZdZdZdZdZdZdZeZdZeZdZdZdZeZdZ dZ!dZ"dZ#dZ$eZ%dZ&dd!d"Z'd#d$ Z(d%d& Z)dd(d)Z*d*d+ Z+d,d- Z,d.d/ Z-dd0d1Z.d2d3 Z/d4d5 Z0d6d7 Z1d8d9 Z2e3d:d; Z4d<d= Z5d>d? Z6d@dA Z7dBdC Z8dDdE Z9dFdG Z:dHdI Z;dJdK Z<dLdM Z=dNdO Z>dPdQ Z?dRdS Z@dTdU ZAdVdW ZBdXdY ZCdZd[ ZDdd\d]ZEdd^d_ZFd`da ZGddbdcZHddde ZIdfdg ZJdhdi ZKddkdlZLddmdnZMdodp ZNdqdr ZOdddjdjdd'dd'ddddsdtduZPddvdwZQdxdy ZRdzd{ ZSd|d} ZTd~d ZUdd ZVdd ZWdd ZXdd ZYdd ZZdd Z[dd Z\dd Z]dd Z^dddZ_dddZ`dddZadddZbdd Zcdd Zddd Zedd ZfdddZgdddZhdd Zidd Zjdd ZkdddZldS )BaseDatabaseSchemaEditorz
    This class and its subclasses are responsible for emitting schema-changing
    statements to the databases - model creation/removal/alteration, field
    renaming, index fiddling, and so on.
    z'CREATE TABLE %(table)s (%(definition)s)z1ALTER TABLE %(old_table)s RENAME TO %(new_table)sz7ALTER TABLE %(table)s SET TABLESPACE %(new_tablespace)szDROP TABLE %(table)s CASCADEz:ALTER TABLE %(table)s ADD COLUMN %(column)s %(definition)sz!ALTER TABLE %(table)s %(changes)sz%ALTER COLUMN %(column)s TYPE %(type)sz%ALTER COLUMN %(column)s DROP NOT NULLz$ALTER COLUMN %(column)s SET NOT NULLz/ALTER COLUMN %(column)s SET DEFAULT %(default)sz$ALTER COLUMN %(column)s DROP DEFAULTz2ALTER COLUMN %(column)s TYPE %(type)s%(collation)sz4ALTER TABLE %(table)s DROP COLUMN %(column)s CASCADEzDALTER TABLE %(table)s RENAME COLUMN %(old_column)s TO %(new_column)szFUPDATE %(table)s SET %(column)s = %(default)s WHERE %(column)s IS NULLz"UNIQUE (%(columns)s)%(deferrable)szCHECK (%(check)s)z.ALTER TABLE %(table)s DROP CONSTRAINT %(name)sz"CONSTRAINT %(name)s %(constraint)sz?ALTER TABLE %(table)s ADD CONSTRAINT %(name)s CHECK (%(check)s)zPALTER TABLE %(table)s ADD CONSTRAINT %(name)s UNIQUE (%(columns)s)%(deferrable)sz|ALTER TABLE %(table)s ADD CONSTRAINT %(name)s FOREIGN KEY (%(column)s) REFERENCES %(to_table)s (%(to_column)s)%(deferrable)sNzQCREATE INDEX %(name)s ON %(table)s (%(columns)s)%(include)s%(extra)s%(condition)szOCREATE UNIQUE INDEX %(name)s ON %(table)s (%(columns)s)%(include)s%(condition)sz/ALTER INDEX %(old_name)s RENAME TO %(new_name)szDROP INDEX %(name)szGALTER TABLE %(table)s ADD CONSTRAINT %(name)s PRIMARY KEY (%(columns)s)zDROP PROCEDURE %(procedure)sFTc                 C   s,   || _ || _| jrg | _| j jjo$|| _d S r"   )
connectioncollect_sqlcollected_sqlfeaturescan_rollback_ddlatomic_migration)selfr0   r1   r   r   r   r   __init__   s
    z!BaseDatabaseSchemaEditor.__init__c                 C   s(   g | _ | jr$t| jj| _| j  | S r"   )deferred_sqlr5   r   r0   alias	__enter__r6   r   r   r   r:      s
    
z"BaseDatabaseSchemaEditor.__enter__c                 C   s8   |d kr| j D ]}| | q| jr4| j||| d S r"   )r8   executer5   r   __exit__)r6   exc_type	exc_value	tracebacksqlr   r   r   r=      s
    
z!BaseDatabaseSchemaEditor.__exit__r   c              	   C   s   | j s | jjr | jjjs tdt|}tjd||||dd | j r|	 
drXdnd}|dk	r| j|tt| j| |  q| j||  n"| j }||| W 5 Q R X dS )z:Execute the given SQL statement, with optional parameters.ziExecuting DDL statements while in a transaction on databases that can't perform a rollback is prohibited.z%s; (params %r))paramsrA   )extra; N)r1   r0   Zin_atomic_blockr3   r4   r   strloggerdebugrstripendswithr2   appendtuplemapquote_valuecursorr<   )r6   rA   rB   ZendingrO   r   r   r   r<      s2       z BaseDatabaseSchemaEditor.executec                 C   s   | j j|S r"   )r0   ops
quote_name)r6   r   r   r   r   rQ      s    z#BaseDatabaseSchemaEditor.quote_namec                    s    j jD ]*} fdd|D }j | qg }g } j jD ]<} |\}}|dkrdqD|jjd}	|	d r|dj	|	  7 }|j
jd}
|
r|d|
 7 }|| |jr6|jr6|jjj j}|jjj |jjj}jr|dj||d  7 }n"jjjr6j |d	 |d
|j|f  | dkrDjj j j|j}|rDj| qD fdd j jD }j j jddd ||D d } j jrjj j j}|r|d| 7 }||fS )z-Take a model and return its table definition.c                    s   g | ]} j |qS r   r   	get_fieldr%   r   r   r   r   
<listcomp>   s     z6BaseDatabaseSchemaEditor.table_sql.<locals>.<listcomp>Nr0   check z %s)to_table	to_column_fk_%(to_table)s_%(to_column)sz%s %s)Z	AutoFieldZBigAutoFieldZSmallAutoFieldc                    s   g | ]}|  qS r   )Zconstraint_sqlr%   
constraintr    r6   r   r   rU   	  s   , c                 s   s   | ]}|rt |V  qd S r"   )rF   r\   r   r   r   r(     s   z5BaseDatabaseSchemaEditor.table_sql.<locals>.<genexpr>)table
definition) r   Zunique_togetherr8   rK   _create_unique_sqllocal_fields
column_sqldb_parametersr0   sql_check_constraintdb_type_suffixextendr,   db_constraintr    db_tablerS   
field_namecolumnsql_create_inline_fkrQ   r3   supports_foreign_keys_create_fk_sqlget_internal_typerP   autoinc_sqlconstraintssql_create_tablejoindb_tablespacetablespace_sql)r6   r    field_namesfieldsZcolumn_sqlsrB   r   ra   Zextra_params	db_paramscol_type_suffixrY   rZ   rq   rr   rA   rv   r   r^   r   	table_sql   s    

  
	 

z"BaseDatabaseSchemaEditor.table_sqlc                 c   s&  |V  | d }r | |V  |j}|oD| | oD|oB| | }|r| |}	|	d k	rd| | }
| jjj	r|
| 
|	 V  n|
V  ||	 |jr|js| jjjrd}|sdV  n| jjjsdV  |jrdV  n|jrdV  |jp|jj}|r"| jjjr"|jr"| jjj|ddV  d S )	N	collationzDEFAULT TzNOT NULLZNULLzPRIMARY KEYZUNIQUE)inline)get_collate_sqlnullskip_defaultskip_default_on_altereffective_default_column_default_sqlr0   r3   requires_literal_defaultsprepare_defaultrK   empty_strings_allowedr   !interprets_empty_strings_as_nullsZimplied_column_nulluniqueru   r   Zsupports_tablespacesrP   rv   )r6   column_db_typerB   r    r   field_db_paramsinclude_defaultr|   r   default_valueZcolumn_defaultZ
tablespacer   r   r   _iter_column_sql  sP    
	



z)BaseDatabaseSchemaEditor._iter_column_sqlc              
   C   sD   |j | jd}|d }|dkr"dS g }d| |||||||fS )z
        Return the column definition for a field. The field must already have
        had set_attributes_from_name() called.
        rV   typeN)NNrX   )re   r0   rt   r   )r6   r    r   r   r   r   rB   r   r   r   rd   V  s"    z#BaseDatabaseSchemaEditor.column_sqlc                 C   s   dS )z
        Some backends don't accept default values for certain columns types
        (i.e. MySQL longtext and longblob).
        Fr   r6   r   r   r   r   r   q  s    z%BaseDatabaseSchemaEditor.skip_defaultc                 C   s   dS )z
        Some backends don't accept default values for certain columns types
        (i.e. MySQL longtext and longblob) in the ALTER COLUMN statement.
        Fr   r   r   r   r   r   x  s    z.BaseDatabaseSchemaEditor.skip_default_on_alterc                 C   s   t ddS )zU
        Only used for backends which have requires_literal_defaults feature
        zsubclasses of BaseDatabaseSchemaEditor for backends which have requires_literal_defaults must provide a prepare_default() methodNNotImplementedErrorr6   valuer   r   r   r     s    z(BaseDatabaseSchemaEditor.prepare_defaultc                 C   s   dS )z
        Return the SQL to use in a DEFAULT clause. The resulting string should
        contain a '%s' placeholder for a default value.
        %sr   r   r   r   r   r     s    z,BaseDatabaseSchemaEditor._column_default_sqlc                 C   s   |   r|  }n| js<| jr<| jr<|  dkr6d}qd}nbt| ddsTt| ddr|  }|dkrnt }qt	 }|dkr|
 }q|d	kr| }nd }|S )
NZBinaryField    rE   Zauto_nowFZauto_now_addZDateTimeFieldZ	DateFieldZ	TimeField)has_defaultget_defaultr   Zblankr   rp   getattrr   nowr   datetime)r   defaultZinternal_typer   r   r   _effective_default  s"    



z+BaseDatabaseSchemaEditor._effective_defaultc                 C   s   | | || jS )z2Return a field's effective database default value.)Zget_db_prep_saver   r0   r   r   r   r   r     s    z*BaseDatabaseSchemaEditor.effective_defaultc                 C   s
   t  dS )aX  
        Return a quoted version of the value so it's safe to use in an SQL
        string. This is not safe against injection from user code; it is
        intended only for use in making SQL scripts or preparing default values
        for particularly tricky backends (defaults are not user-defined, though,
        so this is safe).
        Nr   r   r   r   r   rN     s    z$BaseDatabaseSchemaEditor.quote_valuec                 C   s\   |  |\}}| ||pd | j| | |jjD ]}|jjjj	r8| 
|jj q8dS )zr
        Create a table and any accompanying indexes or unique constraints for
        the given `model`.
        N)r{   r<   r8   rh   _model_indexes_sqlr   local_many_to_manyr,   throughauto_createdcreate_model)r6   r    rA   rB   r   r   r   r   r     s    z%BaseDatabaseSchemaEditor.create_modelc                 C   s~   |j jD ]}|jjj jr| |jj q| | jd| |j j	i  t
| jD ](}t|trP||j j	rP| j| qPdS )z!Delete a model from the database.r`   N)r   r   r,   r   r   delete_modelr<   sql_delete_tablerQ   rj   listr8   
isinstancer   Zreferences_tableremove)r6   r    r   rA   r   r   r   r     s     z%BaseDatabaseSchemaEditor.delete_modelc                 C   s.   |j r| jjjsdS | j||| dd dS )zAdd an index on a model.NrB   )contains_expressionsr0   r3   supports_expression_indexesr<   
create_sqlr6   r    indexr   r   r   	add_index  s    z"BaseDatabaseSchemaEditor.add_indexc                 C   s*   |j r| jjjsdS | |||  dS )zRemove an index from a model.N)r   r0   r3   r   r<   
remove_sqlr   r   r   r   remove_index  s    z%BaseDatabaseSchemaEditor.remove_indexc                 C   sD   | j jjr(| j| ||j|jd d n| || | || d S )Nr   )r0   r3   Zcan_rename_indexr<   _rename_index_sqlr   r   r   )r6   r    Z	old_indexZ	new_indexr   r   r   rename_index  s    
z%BaseDatabaseSchemaEditor.rename_indexc                 C   s"   | || }|r| j|dd dS )zAdd a constraint to a model.Nr   )r   r<   r6   r    r]   rA   r   r   r   add_constraint  s    z'BaseDatabaseSchemaEditor.add_constraintc                 C   s   | || }|r| | dS )z!Remove a constraint from a model.N)r   r<   r   r   r   r   remove_constraint  s    z*BaseDatabaseSchemaEditor.remove_constraintc                    s|   dd |D }dd |D }| |D ]}|  |ddd| j q&| |D ](} fdd|D }| |  | qNd	S )
z
        Deal with a model changing its unique_together. The input
        unique_togethers must be doubly-nested, not the single-nested
        ["foo", "bar"] format.
        c                 S   s   h | ]}t |qS r   rL   r%   rx   r   r   r   	<setcomp>  s     zABaseDatabaseSchemaEditor.alter_unique_together.<locals>.<setcomp>c                 S   s   h | ]}t |qS r   r   r   r   r   r   r     s     TF)r   r   c                    s   g | ]} j |qS r   rR   rT   r   r   r   rU     s     zBBaseDatabaseSchemaEditor.alter_unique_together.<locals>.<listcomp>N)
difference_delete_composed_indexsql_delete_uniquer<   rb   )r6   r    Zold_unique_togetherZnew_unique_togetheroldsnewsrx   rw   r   r   r   alter_unique_together  s    z.BaseDatabaseSchemaEditor.alter_unique_togetherc                    s   dd |D }dd |D }| |D ]}|  |ddd| j q&| |D ],} fdd|D }| | j |d	d
 qNdS )z
        Deal with a model changing its index_together. The input
        index_togethers must be doubly-nested, not the single-nested
        ["foo", "bar"] format.
        c                 S   s   h | ]}t |qS r   r   r   r   r   r   r   &  s     z@BaseDatabaseSchemaEditor.alter_index_together.<locals>.<setcomp>c                 S   s   h | ]}t |qS r   r   r   r   r   r   r   '  s     TF)r   r   c                    s   g | ]} j |qS r   rR   rT   r   r   r   rU   2  s     zABaseDatabaseSchemaEditor.alter_index_together.<locals>.<listcomp>_idxrx   suffixN)r   r   sql_delete_indexr<   _create_index_sql)r6   r    Zold_index_togetherZnew_index_togetherr   r   rx   rw   r   r   r   alter_index_together   s    z-BaseDatabaseSchemaEditor.alter_index_togetherc           
         s   dd  j jD }dd  j jD } fdd|D }| j |fd||B i|}|ddkr|r| jjjrt| j	 j j
|d	d
}	|	|kr|	g}t|dkrtdt| j j
d|f | | | |d  d S )Nc                 S   s   h | ]
}|j qS r   r   r\   r   r   r   r   6  s    zBBaseDatabaseSchemaEditor._delete_composed_index.<locals>.<setcomp>c                 S   s   h | ]
}|j qS r   r   r\   r   r   r   r   9  s     c                    s   g | ]} j |jqS r   )r   rS   rl   rT   r   r   r   rU   :  s     zCBaseDatabaseSchemaEditor._delete_composed_index.<locals>.<listcomp>excluder   TFquote   z1Found wrong number (%s) of constraints for %s(%s)r_   r   )r   rr   indexes_constraint_namesr~   r0   r3   Z*allows_multiple_constraints_on_same_fieldsrF   _unique_constraint_namerj   len
ValueErrorrt   r<   _delete_constraint_sql)
r6   r    rx   Zconstraint_kwargsrA   meta_constraint_namesmeta_index_namescolumnsconstraint_namesdefault_namer   r   r   r   5  sD    z/BaseDatabaseSchemaEditor._delete_composed_indexc                 C   sn   ||ks"| j jjr&| | kr&dS | | j| || |d  | jD ]}t|t	rN|
|| qNdS )z#Rename the table a model points to.N)Z	old_tableZ	new_table)r0   r3   Zignores_table_name_caselowerr<   sql_rename_tablerQ   r8   r   r   Zrename_table_references)r6   r    Zold_db_tableZnew_db_tablerA   r   r   r   alter_db_tableW  s     

z'BaseDatabaseSchemaEditor.alter_db_tablec                 C   s2   |  | j| |jj| || |d  dS )z)Move a model's table between tablespaces.)r`   Zold_tablespaceZnew_tablespaceN)r<   sql_retablespace_tablerQ   r   rj   )r6   r    Zold_db_tablespaceZnew_db_tablespacer   r   r   alter_db_tablespacej  s    z,BaseDatabaseSchemaEditor.alter_db_tablespacec              
   C   s
  |j r |jjjjr | |jjS | j||dd\}}|dkr@dS |j| jd }r`|d| 7 }|j	| jd}|d r|d| j
|  7 }|jrT| jjjrT|jrTd}| jr>|jjjj}|jjj|jjj}	t|jj\}
}|d| j| ||||
r
d| |
 nd	| |j| || |	| jj d
  7 }n| j| ||| | j| |jj| |j|d }| || | |s| |dk	r| j |d|dd\}}| j!| |jj|d }| || | j"| #|| | jjj$r| j%  dS )z
        Create a field on a model. Usually involves adding a column, but may
        involve adding a table instead (for M2M fields).
        T)r   NrV   rX   rW   r[   z%s.rE   )r   	namespacerl   rY   rZ   
deferrable)r`   rl   ra   dropr`   changes)&r   r,   r   r   r   r   rd   rg   r0   re   rf   r3   rn   ri   sql_create_column_inline_fkr    rj   rS   rk   rl   r   _fk_constraint_namerQ   rP   deferrable_sqlr8   rK   ro   sql_create_columnr<   r   r   _alter_column_default_sqlsql_alter_columnrh   _field_indexes_sqlconnection_persists_old_columnsclose)r6   r    r   ra   rB   rz   ry   Zconstraint_suffixrY   rZ   r   _rA   changes_sqlr   r   r   	add_fieldu  sx    



   
z"BaseDatabaseSchemaEditor.add_fieldc                 C   s   |j r |jjjjr | |jjS |j| jdd dkr:dS |jrp| j||j	gdd}|D ]}| 
| || qX| j| |jj| |j	d }| 
| | jjjr| j  t| jD ],}t|tr||jj|j	r| j| qdS )z
        Remove a field from a model. Usually involves deleting a column,
        but for M2Ms may involve deleting a table.
        rV   r   NTforeign_key)r`   rl   )r   r,   r   r   r   r   re   r0   r   rl   r<   _delete_fk_sqlsql_delete_columnrQ   rj   r3   r   r   r   r8   r   r   Zreferences_columnr   )r6   r    r   fk_namesfk_namerA   r   r   r   remove_field  s*    



 z%BaseDatabaseSchemaEditor.remove_fieldc           	   
   C   s6  |  ||sdS |j| jd}|d }|j| jd}|d }|dkrN|jdks`|dkrr|jdkrrtd||f n|dkr|dkr|jjr|jjr|jjjjr|jjjjr| ||||S |dkr|dkr|jjr|jjr|jjjjs|jjjjsdS |dks
|dkrtd||f | 	|||||||| dS )a'  
        Allow a field's type, uniqueness, nullability, default, column,
        constraints, etc. to be modified.
        `old_field` is required to compute the necessary changes.
        If `strict` is True, raise errors if the old column does not match
        `old_field` precisely.
        NrV   r   zqCannot alter field %s into %s - they do not properly define db_type (are you using a badly-written custom field?)zCannot alter field %s into %s - they are not compatible types (you cannot alter to or from M2M fields, or add or remove through= on M2M fields))
_field_should_be_alteredre   r0   r,   r   r   r   r   _alter_many_to_many_alter_field)	r6   r    r'   r)   strictold_db_paramsold_typenew_db_paramsnew_typer   r   r   alter_field  st    




z$BaseDatabaseSchemaEditor.alter_fieldc	           /      C   s  t  }	| jjjr|jr|jr| j||jgdd}
|r\t|
dkr\t	dt|
|j
j|jf |
D ]$}|	|jf | | || q`|jr|jr| ||rdd |j
jD }| j||jgdd|d}|rt|dkrt	d	t||j
j|jf |D ]}| | || q|d
}|d
}| jjjod|jrD|jsT|jod|jod||kpd||k}|rt||D ]B\}}| j|j|jjgdd}|D ]}| | |j| qqv|jr$|js$|jr|jr$dd |j
jD }| j||jgdtj|d}|D ]}| | || q
|d |d kr|d rdd |j
jD }| j||jgd|d}|rt|dkrt	dt||j
j|jf |D ]}| | || q|j|jkr| | |j
j||| | jD ](}t |t!r|"|j
j|j|j qg }g }g }|j#| jd}|j#| jd}||kr\| $||||}|%| n:||f||fkr| &||||\}}|%| |'| d} |j(r|j(s| )|}!| )|}"| *|s|!|"kr|"dk	rd} |%| +||| |j(|j(kr"| ,|||}|r"|%| |- o:|j(o:|j( }#|sH|r&|#sV|| }| jjj.r|rt/t0| \}}$d1|t2|$g fg}|D ],\}}$| | j3| 4|j
j|d |$ q|#r&| | j5| 4|j
j| 4|jdd |"g |D ],\}}$| | j3| 4|j
j|d |$ q|rH|D ]\}}$| ||$ q0|jrd|jsd| 6|| | 7||r| | 8||g |jr|jr|jr|js| | j9||gd g }%|r|%'t|| | ||r| | :|| |%'t|| |%D ]\}&}|jj;| jd}'|'d }(|'d
})|&jj;| jd}*|*d
}+|+|)krr| $|j|j|(|)}g }n| &|j|&j|j|(\}}| | j3| 4|jj
j|d d |d  |D ]\}}$| ||$ qq
| jjjr|jr|	s|jr|js|jr| | <||d |rV|%D ],\},}-|-jjr(| | <|-j|-jd q(|d |d kr|d r| j=|j
j|jgdd}| | >|||d  | r| j+|||dd\}.}$| j3| 4|j
j|.d }| ||$ | jjj?r| j@  dS )z3Perform a "physical" (non-ManyToMany) field update.Tr   r   z<Found wrong number (%s) of foreign key constraints for %s.%sc                 S   s   h | ]
}|j qS r   r   r\   r   r   r   r   F  s    z8BaseDatabaseSchemaEditor._alter_field.<locals>.<setcomp>F)r   r   r   z7Found wrong number (%s) of unique constraints for %s.%sr|   c                 S   s   h | ]
}|j qS r   r   )r%   r   r   r   r   r     s     )r   type_r   rW   c                 S   s   h | ]
}|j qS r   r   r\   r   r   r   r     s    )rW   r   z6Found wrong number (%s) of check constraints for %s.%srV   Nr_   r   r   )r`   rl   r   rx   r   r   r[   Z_fk_checkr   r   )Asetr0   r3   rn   r,   ri   r   rl   r   r   r   rj   addr<   r   r   _field_became_primary_keyrr   _delete_unique_sqlr~   r   r+   Zrelated_modelr   db_indexr   r   r   _delete_index_sql_delete_check_sql_rename_field_sqlr8   r   r   Zrename_column_referencesrg   _alter_column_collation_sqlrK   _alter_column_type_sqlrh   r   r   r   r   _alter_column_null_sqlr   Zsupports_combined_altersrL   r*   rt   sumr   rQ   sql_update_with_default_delete_primary_key_unique_should_be_addedrb   r   _create_primary_key_sqlre   ro   _create_index_name_create_check_sqlr   r   )/r6   r    r'   r)   r   r   r   r   r   Zfks_droppedr   r   r   r   constraint_nameZold_collationnew_collationZdrop_foreign_keysZ_old_relr.   Zrel_fk_namesr   Zindex_names
index_namerA   actionsZnull_actionsZpost_actionsZold_type_suffixZnew_type_suffixfragmentZother_actionsZneeds_database_defaultZold_defaultnew_defaultZfour_way_default_alterationrB   Zrels_to_updater-   Zrel_db_paramsZrel_typeZrel_collationZold_rel_db_paramsZold_rel_collationr   relr   r   r   r   r     sN     


     
  
      









   
     
z%BaseDatabaseSchemaEditor._alter_fieldc                 C   sV   | j jjr|jrdS |j| j d}|jr.| jn| j}|| |j	|d d g fS dS )z
        Hook to specialize column null alteration.

        Return a (sql, params) fragment to set a column to null or non-null
        as required by new_field, or None if no changes are required.
        NrV   r   rl   r   )
r0   r3   r   r   re   r   sql_alter_column_nullsql_alter_column_not_nullrQ   rl   )r6   r    r'   r)   r   rA   r   r   r   r  x  s"    
z/BaseDatabaseSchemaEditor._alter_column_null_sqlc           
      C   s   |  |}| |}|g}|r$g }n| jjjr<| |}g }|j| jd}|rd|jr\| j}	qj| j	}	n| j
}	|	| |j|d |d |fS )z
        Hook to specialize column default alteration.

        Return a (sql, params) fragment to add or drop (depending on the drop
        argument) a default to new_field's column.
        rV   r   )rl   r   r   )r   r   r0   r3   r   r   re   r    sql_alter_column_no_default_nullsql_alter_column_no_defaultsql_alter_column_defaultrQ   rl   )
r6   r    r'   r)   r   r  r   rB   r   rA   r   r   r   r     s,    




z2BaseDatabaseSchemaEditor._alter_column_default_sqlc                 C   s    | j | |j|d g fg fS )a  
        Hook to specialize column type alteration for different backends,
        for cases when a creation type is different to an alteration type
        (e.g. SERIAL in PostgreSQL, PostGIS fields).

        Return a two-tuple of: an SQL fragment of (sql, params) to insert into
        an ALTER TABLE statement and a list of extra (sql, params) tuples to
        run once the field is altered.
        r  )sql_alter_column_typerQ   rl   )r6   r    r'   r)   r   r   r   r   r
    s    
z/BaseDatabaseSchemaEditor._alter_column_type_sqlc                 C   s0   | j | |j||r"d| | ndd g fS )NrX   rE   )rl   r   r|   )sql_alter_column_collaterQ   rl   r   )r6   r    r)   r   r  r   r   r   r	    s    
z4BaseDatabaseSchemaEditor._alter_column_collation_sqlc                 C   s   |j jjj|j jjjkr:| |j j|j jjj|j jjj | |j j|j jj| |j jj|  | |j j|j jj| |j jj|  dS )z*Alter M2Ms to repoint their to= endpoints.N)	r,   r   r   rj   r   r   rS   Zm2m_reverse_field_nameZm2m_field_name)r6   r    r'   r)   r   r   r   r   r     s.    





z,BaseDatabaseSchemaEditor._alter_many_to_manyrE   c           	      C   s   t |\}}dt|f|ddi|f }| jj p6d}d|d||f }t||kr\|S t||d kr||d|d  }|t| d	 d
 }d|d| d|d| |f }|d dks|d  rd|dd  }|S )z
        Generate a unique name for an index/unique constraint.

        The name is divided into 3 parts: the table name, the column names,
        and a unique digest and suffix.
        z%s%slength      z%s_%s_%sr      N   r   r   zD%s)r   r
   r0   rP   Zmax_name_lengthrt   r   isdigit)	r6   Z
table_namecolumn_namesr   r   Zhash_suffix_part
max_lengthr  Zother_lengthr   r   r   r    s(    
z+BaseDatabaseSchemaEditor._create_index_namec                 C   sf   |d krHt |dkr*|d jr*|d j}ntjr8tj}n|jjrH|jj}|d k	rbd| jj| S dS )Nr   r   rX   rE   )r   ru   r   ZDEFAULT_INDEX_TABLESPACEr   r0   rP   rv   )r6   r    rx   ru   r   r   r   _get_index_tablespace_sql  s    z2BaseDatabaseSchemaEditor._get_index_tablespace_sqlc                 C   s   |rd| S dS )Nz WHERE rE   r   )r6   	conditionr   r   r   _index_condition_sql*  s    z-BaseDatabaseSchemaEditor._index_condition_sqlc                 C   s,   |r| j jjsdS tdt|jj|| jdS )NrE   z INCLUDE (%(columns)s))r   )r0   r3   supports_covering_indexesr   r   r   rj   rQ   )r6   r    r   r   r   r   _index_include_sql/  s    z+BaseDatabaseSchemaEditor._index_include_sql)rx   r   r   usingru   col_suffixesrA   	opclassesr,  includeexpressionsc                   s   |pg }|pg }t |ddjjd}j|||d}dd |D }|pLj}|jj} fdd}t|t|j	t
||||||r||||	nt|||j||
||d	S )
z
        Return the SQL statement to create the index for one or several fields
        or expressions. `sql` can be specified if the syntax differs from the
        standard (GIS indexes, ...).
        FZ
alias_colsrV   )ru   c                 S   s   g | ]
}|j qS r   rl   rT   r   r   r   rU   T  s     z>BaseDatabaseSchemaEditor._create_index_sql.<locals>.<listcomp>c                     s    d krj | |  S r"   )r  rQ   argskwargsr   r6   r   r   create_index_nameX  s    zEBaseDatabaseSchemaEditor._create_index_sql.<locals>.create_index_name)r`   r   r0  r   rC   r,  r3  )r   get_compilerr0   r+  sql_create_indexr   rj   r   r	   rQ   r   _index_columnsr   rN   r-  r/  )r6   r    rx   r   r   r0  ru   r1  rA   r2  r,  r3  r4  compilerrv   r   r=  r`   r;  r   r:  r   r   7  s4      


z*BaseDatabaseSchemaEditor._create_index_sqlc                 C   s&   t |p
| jt|jj| j| |dS N)r`   r   )r   r   r	   r   rj   rQ   )r6   r    r   rA   r   r   r   r  m  s
    z*BaseDatabaseSchemaEditor._delete_index_sqlc                 C   s*   t | jt|jj| j| || |dS )N)r`   old_namenew_name)r   sql_rename_indexr	   r   rj   rQ   )r6   r    rA  rB  r   r   r   r   t  s    z*BaseDatabaseSchemaEditor._rename_index_sqlc                 C   s   t ||| j|dS )N)r1  )r   rQ   )r6   r`   r   r1  r2  r   r   r   r>  |  s    z'BaseDatabaseSchemaEditor._index_columnsc                    s    j jr j js j jrg S g } j jD ]}||  | q( j jD ],} fdd|D }|| j	 |dd qH j j
D ]&}|jr| jjjr~|| |  q~|S )z
        Return a list of all index SQL statements (field indexes,
        index_together, Meta.indexes) for the specified model.
        c                    s   g | ]} j |qS r   rR   rT   r   r   r   rU     s     z?BaseDatabaseSchemaEditor._model_indexes_sql.<locals>.<listcomp>r   r   )r   ZmanagedproxyZswappedrc   rh   r   Zindex_togetherrK   r   r   r   r0   r3   r   r   )r6   r    outputr   rw   rx   r   r   r   r   r     s    z+BaseDatabaseSchemaEditor._model_indexes_sqlc                 C   s*   g }|  ||r&|| j||gd |S )zT
        Return a list of all index SQL statements for the specified field.
        r   )_field_should_be_indexedrK   r   )r6   r    r   rE  r   r   r   r     s    z+BaseDatabaseSchemaEditor._field_indexes_sqlc                 C   s|   |  \}}}}|  \}}}}	|jD ]}
||
d  q&|jD ]}
|	|
d  q>| |j| |jkpz|||f|||	fkS r"   )ZdeconstructZnon_db_attrspoprQ   rl   )r6   r'   r)   r   old_pathZold_argsZ
old_kwargsnew_pathnew_argsZ
new_kwargsattrr   r   r   r     s    

z1BaseDatabaseSchemaEditor._field_should_be_alteredc                 C   s   |j o|j S r"   )r  r   r6   r    r   r   r   r   rF    s    z1BaseDatabaseSchemaEditor._field_should_be_indexedc                 C   s   |j  o|j S r"   r   r6   r'   r)   r   r   r   r    s    z2BaseDatabaseSchemaEditor._field_became_primary_keyc                 C   s   |j  o|jo|j p|j S r"   )r   r   rN  r   r   r   r    s
    z0BaseDatabaseSchemaEditor._unique_should_be_addedc                 C   s*   | j | || |j| |j|d S )N)r`   Z
old_columnZ
new_columnr   )sql_rename_columnrQ   rl   )r6   r`   r'   r)   r   r   r   r   r    s    

z*BaseDatabaseSchemaEditor._rename_field_sqlc           
   	   C   s   t |jj| j}| |||}t|jj|jg| j}t |jjjj| j}t|jjjj|jjg| j}| j	j
 }	t| j||||||	dS )N)r`   r   rl   rY   rZ   r   )r	   r   rj   rQ   r   r   rl   target_fieldr    r0   rP   r   r   sql_create_fk)
r6   r    r   r   r`   r   rl   rY   rZ   r   r   r   r   ro     s&    
z'BaseDatabaseSchemaEditor._create_fk_sqlc                    s<    fdd}t |jj|jgt|jjjjd |jjg||S )Nc                     s      j| |S r"   rQ   r  r7  r;   r   r   create_fk_name  s    zDBaseDatabaseSchemaEditor._fk_constraint_name.<locals>.create_fk_namer   )r   r   rj   rl   r   rP  r    )r6   r    r   r   rS  r   r;   r   r     s    z,BaseDatabaseSchemaEditor._fk_constraint_namec                 C   s   |  | j||S r"   )r   sql_delete_fkr6   r    r   r   r   r   r     s    z'BaseDatabaseSchemaEditor._delete_fk_sqlc                 C   s,   |d krdS |t jkrdS |t jkr(dS d S )NrE   z DEFERRABLE INITIALLY DEFERREDz DEFERRABLE INITIALLY IMMEDIATE)r   ZDEFERREDZ	IMMEDIATE)r6   r   r   r   r   _deferrable_constraint_sql  s    

z3BaseDatabaseSchemaEditor._deferrable_constraint_sqlc	              	      s   |r j jjsd S |s"|s"|s"|rN j|||||||d}	|	rJ j|	 d S  jd fdd|D  |d }
 j	 
||
d S )N)r   r,  r3  r2  r4  r_   c                    s   g | ]}  |jqS r   )rQ   rl   rT   r;   r   r   rU     s     z8BaseDatabaseSchemaEditor._unique_sql.<locals>.<listcomp>)r   r   r   r]   )r0   r3   &supports_deferrable_unique_constraintsrb   r8   rK   sql_unique_constraintrt   rV  sql_constraintrQ   )r6   r    rx   r   r,  r   r3  r2  r4  rA   r]   r   r;   r   _unique_sql  s4    	z$BaseDatabaseSchemaEditor._unique_sqlc	                 C   s  |r| j jjr8|r| j jjr8|r*| j jjr8|r<| j jjs<d S t|ddj| j d}	|jj	}
dd |D }|d kr| j
|
|dd}n
| |}|s|s|s|r| j}n| j}|r| j|
|d|d	}nt|
||	| j}t|t|
| j||| || || ||d
S )NFr5  rV   c                 S   s   g | ]
}|j qS r   r6  rT   r   r   r   rU   4  s     z?BaseDatabaseSchemaEditor._create_unique_sql.<locals>.<listcomp>Tr   r   )r1  r2  )r`   r   r   r,  r   r3  )r0   r3   rX  supports_partial_indexesr.  r   r   r<  r   rj   r   rQ   sql_create_unique_indexsql_create_uniquer>  r   rN   r   r	   r-  rV  r/  )r6   r    rx   r   r,  r   r3  r2  r4  r?  r`   r   rA   r   r   r   rb     sZ    
   

z+BaseDatabaseSchemaEditor._create_unique_sqlc                    s&   |r fdd}n j }t||d|S )Nc                     s      j| |S r"   rR  r7  r;   r   r   create_unique_nameP  s    zLBaseDatabaseSchemaEditor._unique_constraint_name.<locals>.create_unique_name_uniq)r  r   )r6   r`   r   r   r_  r   r;   r   r   M  s    z0BaseDatabaseSchemaEditor._unique_constraint_namec           	      C   sh   |r| j jjr8|r| j jjr8|r*| j jjr8|r<| j jjs<d S |sL|sL|sL|rT| j}n| j}| |||S r"   )	r0   r3   rX  r\  r.  r   r   r   r   )	r6   r    r   r,  r   r3  r2  r4  rA   r   r   r   r  X  s*    z+BaseDatabaseSchemaEditor._delete_unique_sqlc                 C   s    | j | || jd|i d S )NrW   rW  )rZ  rQ   rf   )r6   r   rW   r   r   r   
_check_sqlt  s    z#BaseDatabaseSchemaEditor._check_sqlc                 C   s$   t | jt|jj| j| ||dS )N)r`   r   rW   )r   sql_create_checkr	   r   rj   rQ   )r6   r    r   rW   r   r   r   r  z  s    z*BaseDatabaseSchemaEditor._create_check_sqlc                 C   s   |  | j||S r"   )r   sql_delete_checkrU  r   r   r   r    s    z*BaseDatabaseSchemaEditor._delete_check_sqlc                 C   s    t |t|jj| j| |dS r@  )r   r	   r   rj   rQ   )r6   templater    r   r   r   r   r     s
    z/BaseDatabaseSchemaEditor._delete_constraint_sqlc
              	      s  |dk	r fdd|D } j  }
 j j|
|jj}W 5 Q R X g }| D ]\}}|dksl||d krP|dk	r|d |krqP|dk	r|d |krqP|dk	r|d |krqP|dk	r|d |krqP|dk	r|d	 sqP|dk	r|d
 |krqP|	r||	krP|| qP|S )z@Return all constraint names matching the columns and conditions.Nc                    s   g | ]} j j|qS r   )r0   introspectionZidentifier_converter)r%   r   r;   r   r   rU     s   z>BaseDatabaseSchemaEditor._constraint_names.<locals>.<listcomp>r   r   r   r   rW   r   r   )r0   rO   re  Zget_constraintsr   rj   itemsrK   )r6   r    r)  r   r   r   r   rW   r   r   rO   rr   resultr   Zinfodictr   r;   r   r     s6    
 z*BaseDatabaseSchemaEditor._constraint_namesc                 C   sV   | j |dd}|r6t|dkr6tdt||jjf |D ]}| | || q:d S )NTrM  r   z0Found wrong number (%s) of PK constraints for %s)r   r   r   r   rj   r<   _delete_primary_key_sql)r6   r    r   r   r  r   r   r   r    s    z,BaseDatabaseSchemaEditor._delete_primary_keyc              
   C   sJ   t | jt|jj| j| | j|jj|jgddt|jj|jg| jdS )NZ_pkr   )r`   r   r   )	r   sql_create_pkr	   r   rj   rQ   r  rl   r   rL  r   r   r   r    s      z0BaseDatabaseSchemaEditor._create_primary_key_sqlc                 C   s   |  | j||S r"   )r   sql_delete_pkrU  r   r   r   rh    s    z0BaseDatabaseSchemaEditor._delete_primary_key_sqlc                 C   s   d|  | S )NzCOLLATE )rQ   )r6   r|   r   r   r   r     s    z%BaseDatabaseSchemaEditor._collate_sqlc                 C   s*   | j | |d|d }| | d S )N,)Z	procedureparam_types)sql_delete_procedurerQ   rt   r<   )r6   Zprocedure_namerl  rA   r   r   r   remove_procedure  s
    z)BaseDatabaseSchemaEditor.remove_procedure)FT)r   )F)F)F)F)rE   )N)N)NNNNN)NNNNNN)T)NNNNN)NNNNNNNN)F)r   )m__name__
__module____qualname____doc__rs   r   r   r   r   r   r   r  r  r  r  r  r!  r   rO  r  rY  rf   Zsql_delete_constraintrZ  rb  rc  r^  r   rQ  rm   r   rT  r=  r]  rC  r   ri  rj  rm  r7   r:   r=   r<   rQ   r{   r   rd   r   r   r   r   staticmethodr   r   rN   r   r   r   r   r   r   r   r   r   r   r   r   r   r   r   r   r  r   r
  r	  r   r  r+  r-  r/  r   r  r   r>  r   r   r   rF  r  r  r  ro   r   r   rV  r[  rb   r   r  ra  r  r  r   r   r  r  rh  r   rn  r   r   r   r   r/   K   s.  
		
S7
	
	
"J 
I 
  [
& 
 
6
	     
,      
5
     

        
)
r/   )loggingr   r   Zdjango.confr   Z!django.db.backends.ddl_referencesr   r   r   r   r   r	   Zdjango.db.backends.utilsr
   r   Zdjango.db.modelsr   r   Zdjango.db.models.sqlr   Zdjango.db.transactionr   r   Zdjango.utilsr   	getLoggerrG   r   r!   r+   r/   r   r   r   r   <module>   s    
