U
    dä)  ć                   @   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 )é    N)ŚDatabaseError)ŚBaseDatabaseSchemaEditorŚ_related_non_m2m_objects)Śduration_iso_stringc                       sĪ   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d!d" Zd#d$ Zd%d& Z fd'd(Z  ZS )*ŚDatabaseSchemaEditorz3ALTER TABLE %(table)s ADD %(column)s %(definition)szMODIFY %(column)s %(type)szMODIFY %(column)s NULLzMODIFY %(column)s NOT NULLz%MODIFY %(column)s DEFAULT %(default)szMODIFY %(column)s DEFAULT NULLz'MODIFY %(column)s %(type)s%(collation)sz,ALTER TABLE %(table)s DROP COLUMN %(column)szHCONSTRAINT %(name)s REFERENCES %(to_table)s(%(to_column)s)%(deferrable)sz(DROP TABLE %(table)s CASCADE CONSTRAINTSz9CREATE INDEX %(name)s ON %(table)s (%(columns)s)%(extra)sc                 C   s   t |tjtjtjfrd| S t |tjr6dt| S t |trXd| dd” dd” S t |tt	t
frtd| ”  S t |tr|rdS dS t|S d S )Nz'%s'ś'z''ś%z%%Ś1Ś0)Ś
isinstanceŚdatetimeŚdateŚtimeŚ	timedeltar   ŚstrŚreplaceŚbytesŚ	bytearrayŚ
memoryviewŚhexŚbool©ŚselfŚvalue© r   śD/tmp/pip-unpacked-wheel-7vj2equ7/django/db/backends/oracle/schema.pyŚquote_value   s    

z DatabaseSchemaEditor.quote_valuec                    s6   |   |jj|j”r$|  |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$   -   s    z!DatabaseSchemaEditor.remove_fieldc                    s0   t   |” |  dd| jj |jj”i ” d S )NaK  
            DECLARE
                i INTEGER;
            BEGIN
                SELECT COUNT(1) INTO i FROM USER_SEQUENCES
                    WHERE SEQUENCE_NAME = '%(sq_name)s';
                IF i = 1 THEN
                    EXECUTE IMMEDIATE 'DROP SEQUENCE "%(sq_name)s"';
                END IF;
            END;
        /Zsq_name)r#   Śdelete_modelŚexecuteŚ
connectionŚopsZ_get_no_autofield_sequence_namer   r    )r   r%   r'   r   r   r)   4   s     ’’õ’z!DatabaseSchemaEditor.delete_modelFc              
      s  zt   ||||” W nģ tk
r } zĢt|}d|ksBd|krR|  |||” n d|kr~|  |jj|j” |  ||||” ntd|krŖ|j	rŖ| j
|dd |  |||” nHd|krš|j	rš| j
|dd |  ||||” |j	rņ|  |  ||”” n W 5 d }~X Y nX d S )Nz	ORA-22858z	ORA-22859z	ORA-30675z	ORA-30673T)Śstrictz	ORA-43923)r#   Śalter_fieldr   r   Ś_alter_field_type_workaroundr"   r   r    r!   Śprimary_keyZ_delete_primary_keyr*   Z_create_primary_key_sql)r   r%   Ś	old_fieldŚ	new_fieldr-   ŚeŚdescriptionr'   r   r   r.   K   s$    z DatabaseSchemaEditor.alter_fieldc                    sf  t  |”}| ” dk|_|  |j”|_|  ||” |  |j”}| | j	”}t
 d|”rbd| }d}t
 d|”r²| ” }|dkrd| }n*|dkrd	| }n|d
kr²d| }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 )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	TimeFieldzCONCAT('1900-01-01 ', %s)zUPDATE %s set %s=%sZ_fkN)ŚcopyŚdeepcopyŚget_internal_typeŚnullŚ_generate_temp_namer!   Z	add_fieldŚ
quote_nameŚdb_typer+   ŚreŚmatchr*   r   r    r$   r#   r.   r0   Śuniquer   r&   Zdb_constraintZ_create_fk_sqlZrelated_model)r   r%   r1   r2   Znew_temp_fieldŚ	new_valueZold_typeZnew_internal_typeŚnew_typeŚ_Śrelr'   r   r   r/   i   sX    



ż’’	’’žžż
’z1DatabaseSchemaEditor._alter_field_type_workaroundc                    sX   dddh}|  ” |krF|  ” |krF|  |jj|j”rF|  |jj|j” t  ||||”S )Nr5   r6   r7   )r:   r   r   r    r!   r"   r#   Ś_alter_column_type_sql)r   r%   r1   r2   rC   Zauto_field_typesr'   r   r   rF   ¬   s    

’
žżz+DatabaseSchemaEditor._alter_column_type_sqlc                 C   s2   |   |”}|d dkr.|d dkr.|dd }|S )z
        Get the properly shortened and uppercased identifier as returned by
        quote_name() but without the quotes.
        r   ś"é’’’’é   )r=   )r   ŚnameŚnnr   r   r   Śnormalize_name·   s    
z#DatabaseSchemaEditor.normalize_namec                 C   s*   t t| ” dd }|  |d | ”S )z@Generate temporary names for workarounds that need temp columns.rI   NrD   )r   ŚhashŚupperrL   )r   Zfor_nameŚsuffixr   r   r   r<   Į   s    z(DatabaseSchemaEditor._generate_temp_namec                 C   s
   |   |”S r   )r   r   r   r   r   Śprepare_defaultĘ   s    z$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   rQ   É   s    ’ž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 )Nzä
                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*   rL   Zfetchone)r   Ś
table_nameŚcolumn_namerT   Śrowr   r   r   r   Ó   s    ų
z(DatabaseSchemaEditor._is_identity_columnc                 C   s$   |   d|  |”|  |”d ” d S )Nz5ALTER TABLE %(table)s MODIFY %(column)s DROP IDENTITY)Śtabler!   )r*   r=   )r   rU   rV   r   r   r   r"   ā   s    ž’’z#DatabaseSchemaEditor._drop_identityc              
   C   sB   | j  ” .}| d|  |”g” | ” d W  5 Q R £ S Q R X d S )Nza
                SELECT default_collation FROM user_tables WHERE table_name = %s
                r   rS   )r   rU   rT   r   r   r   Ś_get_default_collationė   s    
üz+DatabaseSchemaEditor._get_default_collationc                    s(   |d kr|   |jj”}t  ||||”S r   )rY   r   r    r#   Ś_alter_column_collation_sql)r   r%   r2   rC   Znew_collationr'   r   r   rZ   õ   s       ’z0DatabaseSchemaEditor._alter_column_collation_sql)F)Ś__name__Ś
__module__Ś__qualname__Zsql_create_columnZsql_alter_column_typeZsql_alter_column_nullZsql_alter_column_not_nullZsql_alter_column_defaultZsql_alter_column_no_defaultZ sql_alter_column_no_default_nullZsql_alter_column_collateZsql_delete_columnZsql_create_column_inline_fkZsql_delete_tableZsql_create_indexr   r$   r)   r.   r/   rF   rL   r<   rP   rQ   r   r"   rY   rZ   Ś__classcell__r   r   r'   r   r      s6   ’C

	
r   )r8   r   r?   Z	django.dbr   Zdjango.db.backends.base.schemar   r   Zdjango.utils.durationr   r   r   r   r   r   Ś<module>   s   