B
    CVvg½#  ć               @   sD   d dl Z d dlZd dlZd dlmZ d dlmZ G dd deZdS )é    N)ŚDatabaseError)ŚBaseDatabaseSchemaEditorc                   sŚ   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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 fd!d"Zd#d$ Zd%d& Zd'd( Z fd)d*Z  ZS ),ŚDatabaseSchemaEditorz3ALTER TABLE %(table)s ADD %(column)s %(definition)szMODIFY %(column)s %(type)szMODIFY %(column)s NULLzMODIFY %(column)s NOT NULLz%MODIFY %(column)s DEFAULT %(default)szMODIFY %(column)s DEFAULT NULLz'MODIFY %(column)s %(type)s%(collation)sz,ALTER TABLE %(table)s DROP COLUMN %(column)szHCONSTRAINT %(name)s REFERENCES %(to_table)s(%(to_column)s)%(deferrable)sz(DROP TABLE %(table)s CASCADE CONSTRAINTSz9CREATE INDEX %(name)s ON %(table)s (%(columns)s)%(extra)sc             C   s~   t |tjtjtjfrd| S t |tr@d| dd” dd” S t |tttfr\d| 	”  S t |t
rr|rndS dS t|S d S )Nz'%s'ś'z''ś%z%%Ś1Ś0)Ś
isinstanceŚdatetimeŚdateŚtimeŚstrŚreplaceŚbytesŚ	bytearrayŚ
memoryviewŚhexŚbool)ŚselfŚvalue© r   śD/tmp/pip-install-o3oxmrkh/Django/django/db/backends/oracle/schema.pyŚquote_value   s    

z DatabaseSchemaEditor.quote_valuec                s6   |   |jj|j”r$|  |jj|j” t  ||” d S )N)Ś_is_identity_columnŚ_metaŚdb_tableŚcolumnŚ_drop_identityŚsuperŚremove_field)r   ŚmodelŚfield)Ś	__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   Śdelete_modelŚexecuteŚ
connectionŚopsZ_get_no_autofield_sequence_namer   r   )r   r    )r"   r   r   r#   ,   s    
z!DatabaseSchemaEditor.delete_modelFc          
      sĄ   yt   ||||” W n¤ tk
rŗ } zt|}d|ks@d|krP|  |||” nZd|kr||  |jj|j” |  ||||” n.d|krØ|j	rØ| j
|dd |  |||” n W d d }~X Y nX d S )Nz	ORA-22858z	ORA-22859z	ORA-30675z	ORA-30673T)Śstrict)r   Śalter_fieldr   r   Ś_alter_field_type_workaroundr   r   r   r   Zprimary_keyZ_delete_primary_key)r   r    Ś	old_fieldŚ	new_fieldr'   ŚeŚdescription)r"   r   r   r(   <   s    z DatabaseSchemaEditor.alter_fieldc                sš   t  |”}| ” dk|_|  |j”|_|  ||” |  |j”}| | j	”}t
 d|”rbd| }d}t
 d|”rŖ| ” }|dkrd| }n"|dkrd	| }n|d
krŖd| }|  d|  |jj”|  |j”|f ” |  ||” t  |||” dS )aĮ  
        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
        )Ś	AutoFieldŚBigAutoFieldŚ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	TimeFieldzCTO_TIMESTAMP(CONCAT('1900-01-01 ', %s), 'YYYY-MM-DD HH24:MI:SS.FF')zUPDATE %s set %s=%sN)ŚcopyŚdeepcopyŚget_internal_typeŚnullŚ_generate_temp_namer   Z	add_fieldŚ
quote_nameŚdb_typer%   ŚreŚmatchr$   r   r   r   r   r(   )r   r    r*   r+   Znew_temp_fieldZ	new_valueZold_typeZnew_internal_type)r"   r   r   r)   R   s.    




z1DatabaseSchemaEditor._alter_field_type_workaroundc                sX   dddh}|  ” |krF|  ” |krF|  |jj|j”rF|  |jj|j” t  ||||”S )Nr.   r/   r0   )r3   r   r   r   r   r   r   Ś_alter_column_type_sql)r   r    r*   r+   Śnew_typeZauto_field_types)r"   r   r   r:      s    
z+DatabaseSchemaEditor._alter_column_type_sqlc             C   s2   |   |”}|d dkr.|d dkr.|dd }|S )z
        Get the properly shortened and uppercased identifier as returned by
        quote_name() but without the quotes.
        r   ś"é’’’’é   )r6   )r   ŚnameŚnnr   r   r   Śnormalize_name   s    
z#DatabaseSchemaEditor.normalize_namec             C   s*   t t| ” dd }|  |d | ”S )z@Generate temporary names for workarounds that need temp columns.r>   NŚ_)r   ŚhashŚupperrA   )r   Zfor_nameŚsuffixr   r   r   r5      s    z(DatabaseSchemaEditor._generate_temp_namec             C   s
   |   |”S )N)r   )r   r   r   r   r   Śprepare_default   s    z$DatabaseSchemaEditor.prepare_defaultc                s:   t   ||”}| | j”}|d k	r6| ” | jjkr6dS |S )NF)r   Ś_field_should_be_indexedr7   r%   ŚlowerZ_limited_data_types)r   r    r!   Zcreate_indexr7   )r"   r   r   rG      s
    z-DatabaseSchemaEditor._field_should_be_indexedc                s   t   ||”o|  ||” S )N)r   Ś_unique_should_be_addedZ_field_became_primary_key)r   r*   r+   )r"   r   r   rI   ¤   s    z,DatabaseSchemaEditor._unique_should_be_addedc          	   C   sJ   | j  ” 6}| d|  |”|  |”g” | ” }|r<|d S dS Q R X d S )Nzą
                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%   Ścursorr$   rA   Śfetchone)r   Ś
table_nameŚcolumn_namerJ   Śrowr   r   r   r   Ŗ   s
    z(DatabaseSchemaEditor._is_identity_columnc             C   s$   |   d|  |”|  |”d ” d S )Nz5ALTER TABLE %(table)s MODIFY %(column)s DROP IDENTITY)Śtabler   )r$   r6   )r   rL   rM   r   r   r   r   ¶   s    z#DatabaseSchemaEditor._drop_identityc          	   C   s6   | j  ” "}| d|  |”g” | ” d S Q R X d S )Nz]
                SELECT default_collation FROM user_tables WHERE table_name = %s
            r   )r%   rJ   r$   rA   rK   )r   rL   rJ   r   r   r   Ś_get_default_collation¼   s    z+DatabaseSchemaEditor._get_default_collationc                s(   |d kr|   |jj”}t  ||||”S )N)rP   r   r   r   Ś_alter_column_collation_sql)r   r    r+   r;   Znew_collation)r"   r   r   rQ   Ć   s    z0DatabaseSchemaEditor._alter_column_collation_sql)F)Ś__name__Ś
__module__Ś__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_alter_column_collateZsql_delete_columnZsql_create_column_inline_fkZsql_delete_tableZsql_create_indexr   r   r#   r(   r)   r:   rA   r5   rF   rG   rI   r   r   rP   rQ   Ś__classcell__r   r   )r"   r   r   	   s6   .
r   )r1   r
   r8   Z	django.dbr   Zdjango.db.backends.base.schemar   r   r   r   r   r   Ś<module>   s
   