U
    Ha½#  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$ Zd%d& Zd'd( Z fd)d*Z  ZS ),ŚDatabaseSchemaEditorz3ALTER TABLE %(table)s ADD %(column)s %(definition)szMODIFY %(column)s %(type)szMODIFY %(column)s NULLzMODIFY %(column)s NOT NULLz%MODIFY %(column)s DEFAULT %(default)szMODIFY %(column)s DEFAULT NULLz'MODIFY %(column)s %(type)s%(collation)sz,ALTER TABLE %(table)s DROP COLUMN %(column)szHCONSTRAINT %(name)s REFERENCES %(to_table)s(%(to_column)s)%(deferrable)sz(DROP TABLE %(table)s CASCADE CONSTRAINTSz9CREATE INDEX %(name)s ON %(table)s (%(columns)s)%(extra)sc                 C   s~   t |tjtjtjfrd| S t |tr@d| dd” dd” S t |tttfr\d| 	”  S t |t
rr|rndS dS t|S d S )Nz'%s'ś'z''ś%z%%Ś1Ś0)Ś
isinstanceŚdatetimeŚdateŚtimeŚstrŚreplaceŚbytesŚ	bytearrayŚ
memoryviewŚhexŚbool©ŚselfŚvalue© r   śD/tmp/pip-unpacked-wheel-3jxiddxt/django/db/backends/oracle/schema.pyŚquote_value   s    

z DatabaseSchemaEditor.quote_valuec                    s6   |   |jj|j”r$|  |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$   r   r   r&   ,   s    
öz!DatabaseSchemaEditor.delete_modelFc              
      sĄ   zt   ||||” W n¤ tk
rŗ } zt|}d|ks@d|krP|  |||” nZd|kr||  |jj|j” |  ||||” n.d|krØ|j	rØ| j
|dd |  |||” n W 5 d }~X Y nX d S )Nz	ORA-22858z	ORA-22859z	ORA-30675z	ORA-30673T)Śstrict)r    Śalter_fieldr   r   Ś_alter_field_type_workaroundr   r   r   r   Zprimary_keyZ_delete_primary_key)r   r"   Ś	old_fieldŚ	new_fieldr*   ŚeŚdescriptionr$   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_fieldŚ	new_valueZold_typeZnew_internal_typer$   r   r   r,   R   s0    



żz1DatabaseSchemaEditor._alter_field_type_workaroundc                    sX   dddh}|  ” |krF|  ” |krF|  |jj|j”rF|  |jj|j” t  ||||”S )Nr1   r2   r3   )r6   r   r   r   r   r   r    Ś_alter_column_type_sql)r   r"   r-   r.   Śnew_typeZauto_field_typesr$   r   r   r>      s    

’
žż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   )r9   )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.rB   NŚ_)r   ŚhashŚupperrE   )r   Zfor_nameŚsuffixr   r   r   r8      s    z(DatabaseSchemaEditor._generate_temp_namec                 C   s
   |   |”S r   )r   r   r   r   r   Śprepare_default   s    z$DatabaseSchemaEditor.prepare_defaultc                    s:   t   ||”}| | j”}|d k	r6| ” | jjkr6dS |S )NF)r    Ś_field_should_be_indexedr:   r(   ŚlowerZ_limited_data_types)r   r"   r#   Zcreate_indexr:   r$   r   r   rK      s
    z-DatabaseSchemaEditor._field_should_be_indexedc                    s   t   ||”o|  ||” S r   )r    Ś_unique_should_be_addedZ_field_became_primary_key)r   r-   r.   r$   r   r   rM   ¤   s    žz,DatabaseSchemaEditor._unique_should_be_addedc              
   C   sV   | j  ” B}| d|  |”|  |”g” | ” }|r<|d ndW  5 Q R £ S Q R X d S )Nzą
                SELECT
                    CASE WHEN identity_column = 'YES' THEN 1 ELSE 0 END
                FROM user_tab_cols
                WHERE table_name = %s AND
                      column_name = %s
            r   F©r(   Ścursorr'   rE   Zfetchone)r   Ś
table_nameŚcolumn_namerO   Śrowr   r   r   r   Ŗ   s    śz(DatabaseSchemaEditor._is_identity_columnc                 C   s$   |   d|  |”|  |”d ” d S )Nz5ALTER TABLE %(table)s MODIFY %(column)s DROP IDENTITY)Śtabler   )r'   r9   )r   rP   rQ   r   r   r   r   ¶   s    žz#DatabaseSchemaEditor._drop_identityc              
   C   sB   | j  ” .}| d|  |”g” | ” d W  5 Q R £ S Q R X d S )Nz]
                SELECT default_collation FROM user_tables WHERE table_name = %s
            r   rN   )r   rP   rO   r   r   r   Ś_get_default_collation¼   s
    
žz+DatabaseSchemaEditor._get_default_collationc                    s(   |d kr|   |jj”}t  ||||”S r   )rT   r   r   r    Ś_alter_column_collation_sql)r   r"   r.   r?   Znew_collationr$   r   r   rU   Ć   s    z0DatabaseSchemaEditor._alter_column_collation_sql)F)Ś__name__Ś
__module__Ś__qualname__Zsql_create_columnZsql_alter_column_typeZsql_alter_column_nullZsql_alter_column_not_nullZsql_alter_column_defaultZsql_alter_column_no_defaultZ sql_alter_column_no_default_nullZsql_alter_column_collateZsql_delete_columnZsql_create_column_inline_fkZsql_delete_tableZsql_create_indexr   r!   r&   r+   r,   r>   rE   r8   rJ   rK   rM   r   r   rT   rU   Ś__classcell__r   r   r$   r   r   	   s6   .
r   )r4   r
   r;   Z	django.dbr   Zdjango.db.backends.base.schemar   r   r   r   r   r   Ś<module>   s
   