U
    f)                     @   sT   d dl Z d dlZd dlZd dlmZ d dlmZmZ d dlm	Z	 G dd deZ
dS )    N)DatabaseError)BaseDatabaseSchemaEditor_related_non_m2m_objects)duration_iso_stringc                       s   e 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d Z fddZ fddZd) fdd	Z fddZ fddZdd Zdd Zdd Z fddZd d! Zd"d# Zd$d% Zd* fd'd(	Z  ZS )+DatabaseSchemaEditorz3ALTER TABLE %(table)s ADD %(column)s %(definition)sz'MODIFY %(column)s %(type)s%(collation)szMODIFY %(column)s NULLzMODIFY %(column)s NOT NULLz%MODIFY %(column)s DEFAULT %(default)szMODIFY %(column)s DEFAULT NULLz,ALTER TABLE %(table)s DROP COLUMN %(column)szHCONSTRAINT %(name)s REFERENCES %(to_table)s(%(to_column)s)%(deferrable)sz(DROP TABLE %(table)s CASCADE CONSTRAINTSz9CREATE INDEX %(name)s ON %(table)s (%(columns)s)%(extra)sc                 C   s   t |tjtjtjfrd| S t |tjr6dt| S t |trXd|dddd S t |tt	t
frtd|  S t |tr|rdS dS t|S d S )Nz'%s''z''%z%%10)
isinstancedatetimedatetime	timedeltar   strreplacebytes	bytearray
memoryviewhexboolselfvalue r   D/tmp/pip-unpacked-wheel-_jot26k8/django/db/backends/oracle/schema.pyquote_value   s    

z DatabaseSchemaEditor.quote_valuec                    s6   |  |jj|jr$| |jj|j t || d S N)_is_identity_column_metadb_tablecolumn_drop_identitysuperremove_field)r   modelfield	__class__r   r   r$   +   s    z!DatabaseSchemaEditor.remove_fieldc                    s0   t  | | dd| jj|jji  d S )NaK  
            DECLARE
                i INTEGER;
            BEGIN
                SELECT COUNT(1) INTO i FROM USER_SEQUENCES
                    WHERE SEQUENCE_NAME = '%(sq_name)s';
                IF i = 1 THEN
                    EXECUTE IMMEDIATE 'DROP SEQUENCE "%(sq_name)s"';
                END IF;
            END;
        /Zsq_name)r#   delete_modelexecute
connectionopsZ_get_no_autofield_sequence_namer   r    )r   r%   r'   r   r   r)   2   s     z!DatabaseSchemaEditor.delete_modelFc              
      s  zt  |||| W n tk
r } zt|}d|ksBd|krR| ||| nd|kr~| |jj|j | |||| ntd|kr|j	r| j
|dd | ||| nHd|kr|j	r| j
|dd | |||| |j	r| | || n W 5 d }~X Y nX d S )Nz	ORA-22858z	ORA-22859z	ORA-30675z	ORA-30673T)strictz	ORA-43923)r#   alter_fieldr   r   _alter_field_type_workaroundr"   r   r    r!   primary_keyZ_delete_primary_keyr*   Z_create_primary_key_sql)r   r%   	old_field	new_fieldr-   edescriptionr'   r   r   r.   I   s$    z DatabaseSchemaEditor.alter_fieldc                    sf  t |}| dk|_| |j|_| || | |j}|| j	}t
d|rbd| }d}t
d|r| }|dkrd| }n*|dkrd	| }n|d
krd| }d	| }| d| |jj| |j|f  | || t ||| || j	}|jr|js |jrb|jrb||krbt||D ],\}	}
|
jjr4| | |
j|
jd q4dS )a  
        Oracle refuses to change from some type to other type.
        What we need to do instead is:
        - Add a nullable version of the desired field with a temporary name. If
          the new column is an auto field, then the temporary column can't be
          nullable.
        - Update the table to transfer values from old to new
        - Drop old column
        - Rename the new column and possibly drop the nullable property
        )	AutoFieldBigAutoFieldSmallAutoFieldz^N?CLOBzTO_CHAR(%s)ZVARCHAR2z^N?VARCHAR2Z	DateFieldzTO_DATE(%s, 'YYYY-MM-DD')ZDateTimeFieldz,TO_TIMESTAMP(%s, 'YYYY-MM-DD HH24:MI:SS.FF')Z	TimeFieldzCONCAT('1900-01-01 ', %s)zUPDATE %s set %s=%sZ_fkN)copydeepcopyget_internal_typenull_generate_temp_namer!   Z	add_field
quote_namedb_typer+   rematchr*   r   r    r$   r#   r.   r0   uniquer   r&   Zdb_constraintZ_create_fk_sqlZrelated_model)r   r%   r1   r2   Znew_temp_field	new_valueZold_typeZnew_internal_typenew_type_relr'   r   r   r/   g   sX    



	
z1DatabaseSchemaEditor._alter_field_type_workaroundc                    s\   dddh}|  |krF|  |krF| |jj|jrF| |jj|j t ||||||S )Nr5   r6   r7   )r:   r   r   r    r!   r"   r#   _alter_column_type_sql)r   r%   r1   r2   rC   old_collationZnew_collationZauto_field_typesr'   r   r   rF      s     


     z+DatabaseSchemaEditor._alter_column_type_sqlc                 C   s2   |  |}|d dkr.|d dkr.|dd }|S )z
        Get the properly shortened and uppercased identifier as returned by
        quote_name() but without the quotes.
        r   "   )r=   )r   namennr   r   r   normalize_name   s    
z#DatabaseSchemaEditor.normalize_namec                 C   s*   t t| dd }| |d | S )z@Generate temporary names for workarounds that need temp columns.rJ   NrD   )r   hashupperrM   )r   Zfor_namesuffixr   r   r   r<      s    z(DatabaseSchemaEditor._generate_temp_namec                 C   s
   |  |S r   )r   r   r   r   r   prepare_default   s    z$DatabaseSchemaEditor.prepare_defaultc                    s:   t  ||}|| j}|d k	r6| | jjkr6dS |S )NF)r#   _field_should_be_indexedr>   r+   lowerZ_limited_data_types)r   r%   r&   Zcreate_indexr>   r'   r   r   rR      s    z-DatabaseSchemaEditor._field_should_be_indexedc              
   C   sV   | j  B}|d| || |g | }|r<|d ndW  5 Q R  S Q R X d S )Nz
                SELECT
                    CASE WHEN identity_column = 'YES' THEN 1 ELSE 0 END
                FROM user_tab_cols
                WHERE table_name = %s AND
                      column_name = %s
                r   Fr+   cursorr*   rM   Zfetchone)r   
table_namecolumn_namerU   rowr   r   r   r      s    
z(DatabaseSchemaEditor._is_identity_columnc                 C   s$   |  d| || |d  d S )Nz5ALTER TABLE %(table)s MODIFY %(column)s DROP IDENTITY)tabler!   )r*   r=   )r   rV   rW   r   r   r   r"      s    z#DatabaseSchemaEditor._drop_identityc              
   C   sB   | j  .}|d| |g | d W  5 Q R  S Q R X d S )Nza
                SELECT default_collation FROM user_tables WHERE table_name = %s
                r   rT   )r   rV   rU   r   r   r   _get_default_collation   s    
z+DatabaseSchemaEditor._get_default_collationNc                    s*   |d kr|d k	r|  |}t |||S r   )rZ   r#   _collate_sql)r   Z	collationrG   rV   r'   r   r   r[      s    
z!DatabaseSchemaEditor._collate_sql)F)NN)__name__
__module____qualname__Zsql_create_columnZsql_alter_column_typeZsql_alter_column_nullZsql_alter_column_not_nullZsql_alter_column_defaultZsql_alter_column_no_defaultZ sql_alter_column_no_default_nullZsql_delete_columnZsql_create_column_inline_fkZsql_delete_tableZsql_create_indexr   r$   r)   r.   r/   rF   rM   r<   rQ   rR   r   r"   rZ   r[   __classcell__r   r   r'   r   r      s4   C

	
r   )r8   r   r?   Z	django.dbr   Zdjango.db.backends.base.schemar   r   Zdjango.utils.durationr   r   r   r   r   r   <module>   s   