3
g                 @   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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$Zd%d& Z fd'd(Z fd)d*Z  Z S )+DatabaseSchemaEditorz+RENAME TABLE %(old_table)s TO %(new_table)szMODIFY %(column)s %(type)s NULLz#MODIFY %(column)s %(type)s NOT NULLzMODIFY %(column)s %(type)sz'MODIFY %(column)s %(type)s%(collation)sz(ALTER COLUMN %(column)s SET DEFAULT NULLz,ALTER TABLE %(table)s DROP COLUMN %(column)sz)ALTER TABLE %(table)s DROP INDEX %(name)szY, ADD CONSTRAINT %(name)s FOREIGN KEY (%(column)s) REFERENCES %(to_table)s(%(to_column)s)z/ALTER TABLE %(table)s DROP FOREIGN KEY %(name)sz DROP INDEX %(name)s ON %(table)szGALTER TABLE %(table)s ADD CONSTRAINT %(name)s PRIMARY KEY (%(columns)s)z&ALTER TABLE %(table)s DROP PRIMARY KEYz9CREATE INDEX %(name)s ON %(table)s (%(columns)s)%(extra)sc             C   s   | j jrdS dS )Nz8ALTER TABLE %(table)s DROP CONSTRAINT IF EXISTS %(name)sz)ALTER TABLE %(table)s DROP CHECK %(name)s)
connectionmysql_is_mariadb)self r   ]/var/www/tester-filtro-web/env/lib/python3.6/site-packages/django/db/backends/mysql/schema.pysql_delete_check    s    z%DatabaseSchemaEditor.sql_delete_checkc                s6   | j jr| j jdkr2t jS n| j jd	kr2t jS dS )
N
            r      zCALTER TABLE %(table)s CHANGE %(old_column)s %(new_column)s %(type)s)r   r   r   )r   r   r   )r   r   mysql_versionsupersql_rename_column)r   )	__class__r   r	   r   )   s    
z&DatabaseSchemaEditor.sql_rename_columnc             C   sV   | j j  t|tr |jdd}| j j j|| j j j}t|trRt|trR|j }|S )N%z%%)	r   Zensure_connection
isinstancestrreplaceescapeencodersbytesdecode)r   valuequotedr   r   r	   quote_value4   s    

z DatabaseSchemaEditor.quote_valuec             C   s$   |j | j}|d k	o"|j | jjkS )N)db_typer   lowerZ_limited_data_types)r   fieldr   r   r   r	   _is_limited_data_type>   s    z*DatabaseSchemaEditor._is_limited_data_typec             C   s   | j s| j|S dS )NF)$_supports_limited_data_type_defaultsr"   )r   r!   r   r   r	   skip_defaultB   s    
z!DatabaseSchemaEditor.skip_defaultc             C   s   | j |r| jj rdS dS )NTF)r"   r   r   )r   r!   r   r   r	   skip_default_on_alterG   s    z*DatabaseSchemaEditor.skip_default_on_alterc             C   s    | j jr| j jdkS | j jdkS )	Nr   r      r   r      )r   r   r&   )r   r   r'   )r   r   r   )r   r   r   r	   r#   N   s    z9DatabaseSchemaEditor._supports_limited_data_type_defaultsc                s*   | j j r| jr| j|rdS t j|S )Nz(%s))r   r   r#   r"   r   _column_default_sql)r   r!   )r   r   r	   r(   V   s
    

z(DatabaseSchemaEditor._column_default_sqlc                s^   t  j|| | j|rZ|jd tfkrZ| j|}| jd| j|jj	| j|j
d |g d S )Nz%UPDATE %(table)s SET %(column)s = %%s)tablecolumn)r   	add_fieldr$   defaultr   effective_defaultexecuteZ
quote_name_metadb_tabler*   )r   modelr!   r-   )r   r   r	   r+   a   s    
zDatabaseSchemaEditor.add_fieldc                sZ   t  j||}| jjj| jj |jj}|dkrJ|rJ|j dkrJ|j	rJdS | j
| oX|S )NZInnoDB
ForeignKeyF)r   _field_should_be_indexedr   ZintrospectionZget_storage_enginecursorr/   r0   get_internal_typeZdb_constraintr"   )r   r1   r!   Zcreate_indexZstorage)r   r   r	   r3   m   s    z-DatabaseSchemaEditor._field_should_be_indexedc                s`   |j j|d }|j dkrL| j||jgdd}|sL| j| j||gdd t j||f| 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.
        http://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   r2   T)index )fieldssuffix)	r/   	get_fieldr5   Z_constraint_namesr*   r.   Z_create_index_sqlr   _delete_composed_index)r   r1   r8   argsZfirst_fieldZconstraint_names)r   r   r	   r;   |   s    	z+DatabaseSchemaEditor._delete_composed_indexc             C   s   |j r|d7 }n|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                s   | j ||}t j||||S )N)r?   r   _alter_column_type_sql)r   r1   	old_field	new_fieldr>   )r   r   r	   r@      s    z+DatabaseSchemaEditor._alter_column_type_sqlc                s   | j ||}t j||||S )N)r?   r   _rename_field_sql)r   r)   rA   rB   r>   )r   r   r	   rC      s    z&DatabaseSchemaEditor._rename_field_sql)!__name__
__module____qualname__Zsql_rename_tableZsql_alter_column_nullZsql_alter_column_not_nullZsql_alter_column_typeZsql_alter_column_collateZ sql_alter_column_no_default_nullZsql_delete_columnZsql_delete_uniqueZsql_create_column_inline_fkZsql_delete_fkZsql_delete_indexZsql_create_pkZsql_delete_pkZsql_create_indexpropertyr
   r   r   r"   r$   r%   r#   r(   r+   r3   r;   r?   r@   rC   __classcell__r   r   )r   r	   r      s8   	
r   N)Zdjango.db.backends.base.schemar   Zdjango.db.modelsr   r   r   r   r   r	   <module>   s   