U
    dz5                     @   s   d dl mZ d dlZd dlmZ d dlmZ d dlmZ d dlm	Z	 d dl
mZ d dlmZ ed	ejd
 ZeddZG dd deZdS )    )
namedtupleN)
FIELD_TYPE)BaseDatabaseIntrospection)	FieldInfo)	TableInfo)Index)
OrderedSetr   )extrais_unsignedhas_json_constraintInfoLinezXcol_name data_type max_len num_prec num_scale extra column_default collation is_unsignedc                *       s   e Zd Zejdejdejdejdejdej	dej
dejdejdejdejdejd	ejd
ejdejdejdejdejdejdejdejdiZ fddZdd Zdd ZdddZdd Zdd Zdd Z dd Z!  Z"S )DatabaseIntrospectionZ	TextFieldZ	CharFieldZDecimalFieldZ	DateFieldZDateTimeFieldZ
FloatFieldIntegerField	JSONFieldBigIntegerFieldSmallIntegerFieldZ	TimeFieldc                    st   t  ||}d|jkr<|dkr$dS |dkr0dS |dkr<dS |jrf|dkrNdS |dkrZd	S |dkrfd
S |jrpdS |S )Nauto_incrementr   Z	AutoFieldr   ZBigAutoFieldr   ZSmallAutoFieldZPositiveBigIntegerFieldZPositiveIntegerFieldZPositiveSmallIntegerFieldr   )superget_field_typer	   r
   r   )selfZ	data_typedescriptionZ
field_type	__class__ J/tmp/pip-unpacked-wheel-7vj2equ7/django/db/backends/mysql/introspection.pyr   /   s$    
z$DatabaseIntrospection.get_field_typec                 C   s   | d dd | D S )z>Return a list of table and view names in the current database.zSHOW FULL TABLESc                 S   s*   g | ]"}t |d  ddd|d qS )r   tv)z
BASE TABLEZVIEW   )r   get.0rowr   r   r   
<listcomp>H   s   z8DatabaseIntrospection.get_table_list.<locals>.<listcomp>executefetchall)r   cursorr   r   r   get_table_listE   s    
z$DatabaseIntrospection.get_table_listc                 C   s(  i }| j jr6| j jjr6|d|g dd | D }|d|g | }|rX|d nd}|d||g dd	 | D }|d
| j j|  dd }g }|j	D ]z}	||	d  }
|
t|	dd ||
jp|	d ||
jp|	d ||
jp|	d |	d |
j|
j|
j|
j|	d |kf	  q|S )zj
        Return a description of the table with the DB-API cursor.description
        interface."
        av  
                SELECT c.constraint_name AS column_name
                FROM information_schema.check_constraints AS c
                WHERE
                    c.table_name = %s AND
                    LOWER(c.check_clause) =
                        'json_valid(`' + LOWER(c.constraint_name) + '`)' AND
                    c.constraint_schema = DATABASE()
                c                 S   s   h | ]}|d  qS r   r   r   r   r   r   	<setcomp>e   s     z>DatabaseIntrospection.get_table_description.<locals>.<setcomp>z
            SELECT  table_collation
            FROM    information_schema.tables
            WHERE   table_schema = DATABASE()
            AND     table_name = %s
            r    aD  
            SELECT
                column_name, data_type, character_maximum_length,
                numeric_precision, numeric_scale, extra, column_default,
                CASE
                    WHEN collation_name = %s THEN NULL
                    ELSE collation_name
                END AS collation_name,
                CASE
                    WHEN column_type LIKE '%% unsigned' THEN 1
                    ELSE 0
                END AS is_unsigned
            FROM information_schema.columns
            WHERE table_name = %s AND table_schema = DATABASE()
            c                 S   s   i | ]}|d  t | qS r(   )r   )r    liner   r   r   
<dictcomp>   s      z?DatabaseIntrospection.get_table_description.<locals>.<dictcomp>zSELECT * FROM %s LIMIT 1c                 S   s   | d k	rt | S | S N)int)ir   r   r   to_int   s    z;DatabaseIntrospection.get_table_description.<locals>.to_intN            )
connectionmysql_is_mariadbfeaturesZcan_introspect_json_fieldr$   r%   fetchoneops
quote_namer   appendr   max_lenZnum_precZ	num_scaleZcolumn_defaultZ	collationr	   r
   )r   r&   
table_nameZjson_constraintsr!   Zdefault_column_collation
field_infor0   fieldsr+   infor   r   r   get_table_descriptionM   sV    		


z+DatabaseIntrospection.get_table_descriptionr   c                 C   s2   |  ||D ] }d|jkr||jdg  S qg S )Nr   )tablecolumn)rA   r	   name)r   r&   r=   Ztable_fieldsr>   r   r   r   get_sequences   s    
z#DatabaseIntrospection.get_sequencesc                 C   s    | d|g dd | D S )z
        Return a dictionary of {field_name: (field_name_other_table, other_table)}
        representing all foreign keys in the given table.
        aM  
            SELECT column_name, referenced_column_name, referenced_table_name
            FROM information_schema.key_column_usage
            WHERE table_name = %s
                AND table_schema = DATABASE()
                AND referenced_table_name IS NOT NULL
                AND referenced_column_name IS NOT NULL
            c                 S   s   i | ]\}}}|||fqS r   r   )r    
field_nameZother_fieldZother_tabler   r   r   r,      s    z7DatabaseIntrospection.get_relations.<locals>.<dictcomp>r#   )r   r&   r=   r   r   r   get_relations   s    z#DatabaseIntrospection.get_relationsc                 C   s,   | d|g | }|s$| jjjS |d S )z
        Retrieve the storage engine for a given table. Return the default
        storage engine if the table doesn't exist.
        z
            SELECT engine
            FROM information_schema.tables
            WHERE
                table_name = %s AND
                table_schema = DATABASE()
            r   )r$   r8   r5   r7   Z_mysql_storage_engine)r   r&   r=   resultr   r   r   get_storage_engine   s    

z(DatabaseIntrospection.get_storage_enginec                 C   s~   t  }t|d }dd | D }|D ]N}|jtjjkr*| jj	|j
|j
kr*|j
dd |kr*||j
dd  q*|S )Nr   c                 s   s   | ]}|j s|V  qd S r-   )Zis_whitespace)r    tokenr   r   r   	<genexpr>   s      zBDatabaseIntrospection._parse_constraint_columns.<locals>.<genexpr>r   )r   sqlparseparseflattenttypetokensNamer5   r9   r:   valueadd)r   check_clausecolumnsZcheck_columnsZ	statementrQ   rJ   r   r   r   _parse_constraint_columns   s    z/DatabaseIntrospection._parse_constraint_columnsc                 C   s,  i }d}| ||g | D ]j\}}}}}	||krvt |	dk|	dkdd|rT||fndd||< | jjjrvg || d< || d | q| jjjr$d	}
d
d | ||D }| jj	rd}nd}| ||g | D ]J\}}| 
||}t||hkr|
d7 }
d|
 }|dddddd||< q| d| jj|  dd | D D ]\}}}}}}}||krt d| ddd||< | jjjrg || d< d|| d< |dkrtjn| || d< || d | | jjjrN|| d |dkrdnd qN| D ]}t|d |d< q|S )zu
        Retrieve any constraints or keys (unique, pk, fk, check, index) across
        one or more columns.
        ai  
            SELECT kc.`constraint_name`, kc.`column_name`,
                kc.`referenced_table_name`, kc.`referenced_column_name`,
                c.`constraint_type`
            FROM
                information_schema.key_column_usage AS kc,
                information_schema.table_constraints AS c
            WHERE
                kc.table_schema = DATABASE() AND
                c.table_schema = kc.table_schema AND
                c.constraint_name = kc.constraint_name AND
                c.constraint_type != 'CHECK' AND
                kc.table_name = %s
            ORDER BY kc.`ordinal_position`
        PRIMARY KEY>   UNIQUErX   FN)rV   primary_keyuniqueindexcheckforeign_keyZordersrV   r   c                 S   s   h | ]
}|j qS r   )rD   )r    r@   r   r   r   r)   	  s    z8DatabaseIntrospection.get_constraints.<locals>.<setcomp>a  
                    SELECT c.constraint_name, c.check_clause
                    FROM information_schema.check_constraints AS c
                    WHERE
                        c.constraint_schema = DATABASE() AND
                        c.table_name = %s
                a3  
                    SELECT cc.constraint_name, cc.check_clause
                    FROM
                        information_schema.check_constraints AS cc,
                        information_schema.table_constraints AS tc
                    WHERE
                        cc.constraint_schema = DATABASE() AND
                        tc.table_schema = cc.constraint_schema AND
                        cc.constraint_name = tc.constraint_name AND
                        tc.constraint_type = 'CHECK' AND
                        tc.table_name = %s
                r   z__unnamed_constraint_%s__TzSHOW INDEX FROM %sc                 S   s"   g | ]}|d d |d f qS )Nr4   
   r   )r    xr   r   r   r"   8  s    z9DatabaseIntrospection.get_constraints.<locals>.<listcomp>)rV   rZ   r[   r]   r^   r\   ZBTREEtypeDZDESCASC)r$   r%   r   r5   r7   Zsupports_index_column_orderingrT   Z can_introspect_check_constraintsrA   r6   rW   setr9   r:   r   suffixlowerr;   valueslist)r   r&   r=   constraintsZ
name_query
constraintrC   Z	ref_tableZ
ref_columnkindZunnamed_constraints_indexrV   Z
type_queryrU   Zconstraint_columnsrB   Z
non_uniquer\   Zcolseqordertype_r   r   r   get_constraints   s~    


 	


$z%DatabaseIntrospection.get_constraints)r   )#__name__
__module____qualname__r   ZBLOBZCHARZDECIMALZ
NEWDECIMALZDATEZDATETIMEZDOUBLEFLOATZINT24ZJSONLONGZLONGLONGZSHORTSTRINGZTIME	TIMESTAMPZTINYZ	TINY_BLOBZMEDIUM_BLOBZ	LONG_BLOBZ
VAR_STRINGZdata_types_reverser   r'   rA   rE   rG   rI   rW   rn   __classcell__r   r   r   r   r      sf                        X
r   )collectionsr   rM   ZMySQLdb.constantsr   Z%django.db.backends.base.introspectionr   r   ZBaseFieldInfor   Zdjango.db.modelsr   Zdjango.utils.datastructuresr   _fieldsr   r   r   r   r   r   <module>   s     