U
    ecC                     @   s   d Z ddlmZ ddlZddlmZ ddlmZm	Z
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k reddZn
eddZG dd deZdS )zDatabase Introspection.    )
namedtupleN)VERSION)BaseDatabaseIntrospection	FieldInfo	TableInfo)Index)
OrderedSet)	FieldTyper   )extrais_unsignedhas_json_constraint      r   InfoLinezNcol_name data_type max_len num_prec num_scale extra column_default is_unsignedzXcol_name data_type max_len num_prec num_scale extra column_default collation is_unsignedc                &       s   e Zd 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
iZ fddZdd Z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"d!d" Z#  Z$S )$DatabaseIntrospectionz5Encapsulate backend-specific introspection utilities.Z	TextFieldZDecimalFieldZ	DateFieldZDateTimeFieldZ
FloatFieldIntegerFieldBigIntegerFieldSmallIntegerFieldZ	CharFieldZ	TimeFieldc                    st   t  ||}d|jkr<|dkr$dS |dkr0dS |dkr<dS |jrf|dkrNdS |dkrZd	S |dkrfd
S |jrpdS |S )Nauto_incrementr   Z	AutoFieldr   ZBigAutoFieldr   ZSmallAutoFieldZPositiveBigIntegerFieldZPositiveIntegerFieldZPositiveSmallIntegerFieldZ	JSONField)superget_field_typer
   r   r   )selfZ	data_typedescriptionZ
field_type	__class__ H/tmp/pip-unpacked-wheel-ix8dg7li/mysql/connector/django/introspection.pyr   Y   s$    
z$DatabaseIntrospection.get_field_typec                 C   s   | d dd | D S )z>Return a list of table and view names in the current database.zSHOW FULL TABLESc                 S   s*   g | ]"}t |d  ddd|d qS )r   tv)z
BASE TABLEZVIEW   )r   get).0rowr   r   r   
<listcomp>r   s   z8DatabaseIntrospection.get_table_list.<locals>.<listcomp>)executefetchall)r   cursorr   r   r   get_table_listo   s    
z$DatabaseIntrospection.get_table_listc                 C   s  i }| d|g | }|r&|d nd}tdk rB| d|g n| d||g dd | D }| d	| jj| d
 dd }g }|jD ]}	||	d  }
tdk r|t	|	dd ||
j
p|	d ||
jp|	d ||
jp|	d |	d |
j|
j|
j|	d |kf  q|t	|	dd ||
j
p6|	d ||
jpH|	d ||
jpZ|	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."
        z
            SELECT  table_collation
            FROM    information_schema.tables
            WHERE   table_schema = DATABASE()
            AND     table_name = %s
        r    r   a  
                SELECT
                    column_name, data_type, character_maximum_length,
                    numeric_precision, numeric_scale, extra, column_default,
                    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()
            ax  
                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 z 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_intNr            )r%   fetchoneDJANGO_VERSIONr&   
connectionops
quote_namer   appendr   max_lenZnum_precZ	num_scaleZcolumn_defaultr
   r   Z	collation)r   r'   
table_nameZjson_constraintsr#   Zdefault_column_collation
field_infor/   fieldsr*   infor   r   r   get_table_descriptionw   sj    	





z+DatabaseIntrospection.get_table_descriptionc                 C   s   | d| jj|  t| }t }|D ]}|d dkr0||d  q0i }|D ]d}|d |krjqX|d |krddd||d < |d dkrd	||d  d
< |d sXd	||d  d< qX|S )zReturn indexes from table.SHOW INDEX FROM r   r    r   r0   F)primary_keyuniqueZPRIMARYTr@   rA   )r%   r5   r6   r7   listr&   setadd)r   r'   r:   ZrowsZmulticol_indexesr#   Zindexesr   r   r   get_indexes   s"    z!DatabaseIntrospection.get_indexesc                 C   s2   |  || D ]}|d d r|d   S qdS )zP
        Returns the name of the primary key column for the given table
        r    r@   r   N)rE   items)r   r'   r:   columnr   r   r   get_primary_key_column   s    z,DatabaseIntrospection.get_primary_key_columnr   c                 C   s2   |  ||D ] }d|jkr||jdg  S qg S )Nr   )tablerG   )r>   r
   name)r   r'   r:   Ztable_fieldsr;   r   r   r   get_sequences   s    
z#DatabaseIntrospection.get_sequencesc                 C   s0   |  ||}i }|D ]\}}}||f||< q|S )z
        Return a dictionary of {field_name: (field_name_other_table, other_table)}
        representing all relationships to the given table.
        )get_key_columns)r   r'   r:   constraintsZ	relationsZmy_fieldnameZother_tableZother_fieldr   r   r   get_relations  s
    z#DatabaseIntrospection.get_relationsc                 C   s$   g }| d|g ||  |S )z
        Return a list of (column_name, referenced_table_name, referenced_column_name)
        for all key columns in the given table.
        a@  
            SELECT column_name, referenced_table_name, referenced_column_name
            FROM information_schema.key_column_usage
            WHERE table_name = %s
                AND table_schema = DATABASE()
                AND referenced_table_name IS NOT NULL
                AND referenced_column_name IS NOT NULL)r%   extendr&   )r   r'   r:   Zkey_columnsr   r   r   rL     s    
z%DatabaseIntrospection.get_key_columnsc                 C   s,   | d|g | }|s$| 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.
        zBSELECT engine FROM information_schema.tables WHERE table_name = %sr   )r%   r3   r5   featuresZ_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>5  s      zBDatabaseIntrospection._parse_constraint_columns.<locals>.<genexpr>r    )r   sqlparseparseflattenttypetokensNamer5   r6   r7   valuerD   )r   check_clausecolumnsZcheck_columnsZ	statementrZ   rS   r   r   r   _parse_constraint_columns2  s    z/DatabaseIntrospection._parse_constraint_columnsc                 C   s|  i }d}| ||g | D ]`\}}}}||krlt dddd|rJ||fndd||< | jjjrlg || d< || d | qd}	| |	|g | D ]F\}}
|
 dkrd	|| d
< d	|| d< q|
 dkrd	|| d< q| jjjrtd}dd | 	||D }d}	| |	|g | D ]P\}}| 
||}t||hkrZ|d7 }d| d}|dddd	dd||< q"| d| jj|  dd | D D ]\}}}}}}}||krt ddddd||< | jjjrg || d< d	|| d< |dkrtjn| || d< || d | | jjjr|| d |dkrNdnd q| D ]}t|d |d< q`|S )zu
        Retrieve any constraints or keys (unique, pk, fk, check, index) across
        one or more columns.
        aX  
            SELECT kc.`constraint_name`, kc.`column_name`,
                kc.`referenced_table_name`, kc.`referenced_column_name`
            FROM information_schema.key_column_usage AS kc
            WHERE
                kc.table_schema = DATABASE() AND
                kc.table_name = %s
            ORDER BY kc.`ordinal_position`
        FN)r^   r@   rA   indexcheckforeign_keyZordersr^   z
            SELECT c.constraint_name, c.constraint_type
            FROM information_schema.table_constraints AS c
            WHERE
                c.table_schema = DATABASE() AND
                c.table_name = %s
        zprimary keyTr@   rA   r   c                 S   s   h | ]
}|j qS r   )rJ   )r"   r=   r   r   r   	<setcomp>o  s    z8DatabaseIntrospection.get_constraints.<locals>.<setcomp>a  
                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___r?   c                 S   s"   g | ]}|d d |d f qS )Nr2   
   r   )r"   xr   r   r   r$     s    z9DatabaseIntrospection.get_constraints.<locals>.<listcomp>)r^   r@   rA   ra   rb   r`   ZBTREEtypeDZDESCASC)r%   r&   r   r5   rP   Zsupports_index_column_orderingrD   lowerZ can_introspect_check_constraintsr>   r_   rC   r6   r7   r   suffixr8   valuesrB   )r   r'   r:   rM   Z
name_query
constraintrG   Z	ref_tableZ
ref_columnZ
type_querykindZunnamed_constraints_indexr^   r]   Zconstraint_columns_r`   ordertype_r   r   r   get_constraints?  s    	


 	


$z%DatabaseIntrospection.get_constraints)r   )%__name__
__module____qualname____doc__r	   ZBLOBZDECIMALZ
NEWDECIMALZDATEZDATETIMEZDOUBLEFLOATZINT24LONGZLONGLONGZSHORTSTRINGZTIME	TIMESTAMPZTINYZ	TINY_BLOBZMEDIUM_BLOBZ	LONG_BLOBZ
VAR_STRINGZdata_types_reverser   r(   r>   rE   rH   rK   rN   rL   rR   r_   rr   __classcell__r   r   r   r   r   @   sf                      d	
r   )rv   collectionsr   rV   Zdjangor   r4   Z%django.db.backends.base.introspectionr   r   ZBaseFieldInfor   Zdjango.db.modelsr   Zdjango.utils.datastructuresr   Zmysql.connector.constantsr	   _fieldsr   r   r   r   r   r   <module>   s*   