o
    ˷e                     @   s,   d dl mZ d dlmZ G dd deZdS )    )BaseDatabaseSchemaEditor)NOT_PROVIDEDc                       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dZdZdZedd Ze fddZdd Zdd Zdd Zdd Zedd Z fddZ fd d!Z fd"d#Z fd$d%Zd&d' Z fd(d)Z fd*d+Z   Z!S ),DatabaseSchemaEditorz+RENAME TABLE %(old_table)s TO %(new_table)szMODIFY %(column)s %(type)s NULLz#MODIFY %(column)s %(type)s NOT NULLzMODIFY %(column)s %(type)sz'MODIFY %(column)s %(type)s%(collation)sz(ALTER COLUMN %(column)s SET DEFAULT NULLz,ALTER TABLE %(table)s DROP COLUMN %(column)sz)ALTER TABLE %(table)s DROP INDEX %(name)szY, ADD CONSTRAINT %(name)s FOREIGN KEY (%(column)s) REFERENCES %(to_table)s(%(to_column)s)z/ALTER TABLE %(table)s DROP FOREIGN KEY %(name)sz DROP INDEX %(name)s ON %(table)sz?ALTER TABLE %(table)s RENAME INDEX %(old_name)s TO %(new_name)szGALTER TABLE %(table)s ADD CONSTRAINT %(name)s PRIMARY KEY (%(columns)s)z&ALTER TABLE %(table)s DROP PRIMARY KEYz9CREATE INDEX %(name)s ON %(table)s (%(columns)s)%(extra)sc                 C   s   | j jrdS dS )Nz8ALTER TABLE %(table)s DROP CONSTRAINT IF EXISTS %(name)sz)ALTER TABLE %(table)s DROP CHECK %(name)s)
connectionmysql_is_mariadbself r	   V/var/www/ideatree/venv/lib/python3.10/site-packages/django/db/backends/mysql/schema.pysql_delete_check#   s   z%DatabaseSchemaEditor.sql_delete_checkc                    s8   | j jr| j jdkrt jS dS | j jdkrt jS dS )N)
         )   r      zCALTER TABLE %(table)s CHANGE %(old_column)s %(new_column)s %(type)s)r   r   mysql_versionsupersql_rename_columnr   	__class__r	   r
   r   ,   s   z&DatabaseSchemaEditor.sql_rename_columnc                 C   sV   | j   t|tr|dd}| j j || j j j}t|tr)t|tr)| }|S )N%z%%)	r   ensure_connection
isinstancestrreplaceescapeencodersbytesdecode)r   valuequotedr	   r	   r
   quote_value7   s   


z DatabaseSchemaEditor.quote_valuec                 C   s$   | | j}|d uo| | jjv S N)db_typer   lower_limited_data_types)r   fieldr#   r	   r	   r
   _is_limited_data_typeC   s   z*DatabaseSchemaEditor._is_limited_data_typec                 C   s   | j s| |S dS )NF)$_supports_limited_data_type_defaultsr'   r   r&   r	   r	   r
   skip_defaultJ   s   
z!DatabaseSchemaEditor.skip_defaultc                 C   s   |  |r| jjsdS dS )NTF)r'   r   r   r)   r	   r	   r
   skip_default_on_alterO   s   z*DatabaseSchemaEditor.skip_default_on_alterc                 C   s   | j jrdS | j jdkS )NT)r   r      )r   r   r   r   r	   r	   r
   r(   V   s   z9DatabaseSchemaEditor._supports_limited_data_type_defaultsc                    s(   | j js| jr| |rdS t |S )Nz(%s))r   r   r(   r'   r   _column_default_sqlr)   r   r	   r
   r-   ]   s   z(DatabaseSchemaEditor._column_default_sqlc                    sf   t  || | |r/|jd tfvr1| |}| d| |jj	| |j
d |g d S d S d S )Nz%UPDATE %(table)s SET %(column)s = %%s)tablecolumn)r   	add_fieldr*   defaultr   effective_defaultexecute
quote_name_metadb_tabler/   )r   modelr&   r2   r   r	   r
   r0   h   s   

zDatabaseSchemaEditor.add_fieldc                    sV   t  ||s	dS | jj| j |jj}|dkr%| dkr%|j	r%dS | 
| S )NFInnoDB
ForeignKey)r   _field_should_be_indexedr   introspectionget_storage_enginecursorr5   r6   get_internal_typedb_constraintr'   )r   r7   r&   storager   r	   r
   r:   x   s   z-DatabaseSchemaEditor._field_should_be_indexedc                    sb   |j |d }| dkr&| j||jgdd}|s&| | j||gdd t j||g|R  S )a  
        MySQL can remove an implicit FK index on a field when that field is
        covered by another index like a unique_together. "covered" here means
        that the more complex index starts like the simpler one.
        https://bugs.mysql.com/bug.php?id=37910 / Django ticket #24757
        We check here before removing the [unique|index]_together if we have to
        recreate a FK index.
        r   r9   T)index )fieldssuffix)	r5   	get_fieldr>   _constraint_namesr/   r3   _create_index_sqlr   _delete_composed_index)r   r7   rC   argsfirst_fieldconstraint_namesr   r	   r
   rH      s   	
z+DatabaseSchemaEditor._delete_composed_indexc                 C   s   |j r	|d7 }|S |d7 }|S )zt
        Keep the null property of the old field. If it has changed, it will be
        handled separately.
        z NULLz	 NOT NULL)null)r   r&   new_typer	   r	   r
   _set_field_new_type_null_status   s
   z4DatabaseSchemaEditor._set_field_new_type_null_statusc                       |  ||}t ||||S r"   )rN   r   _alter_column_type_sql)r   r7   	old_field	new_fieldrM   r   r	   r
   rP         z+DatabaseSchemaEditor._alter_column_type_sqlc                    rO   r"   )rN   r   _rename_field_sql)r   r.   rQ   rR   rM   r   r	   r
   rT      rS   z&DatabaseSchemaEditor._rename_field_sql)"__name__
__module____qualname__sql_rename_tablesql_alter_column_nullsql_alter_column_not_nullsql_alter_column_typesql_alter_column_collate sql_alter_column_no_default_nullsql_delete_columnsql_delete_uniquesql_create_column_inline_fksql_delete_fksql_delete_indexsql_rename_indexsql_create_pksql_delete_pksql_create_indexpropertyr   r   r!   r'   r*   r+   r(   r-   r0   r:   rH   rN   rP   rT   __classcell__r	   r	   r   r
   r      sF    


r   N)django.db.backends.base.schemar   django.db.modelsr   r   r	   r	   r	   r
   <module>   s    