B
    CVvg©5  ã               @   sz   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 edejd ƒZed	d
ƒZG dd„ deƒZdS )é    )Ú
namedtupleN)Ú
FIELD_TYPE)ÚBaseDatabaseIntrospectionÚ	FieldInfoÚ	TableInfo)ÚIndex)Ú
OrderedSetr   )ÚextraÚis_unsignedÚhas_json_constraintÚInfoLinezXcol_name data_type max_len num_prec num_scale extra column_default collation is_unsignedc            *       sà   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!dd„ Z"‡  Z#S ) ÚDatabaseIntrospectionZ	TextFieldZ	CharFieldZDecimalFieldZ	DateFieldZDateTimeFieldZ
FloatFieldÚIntegerFieldÚ	JSONFieldÚBigIntegerFieldÚSmallIntegerFieldZ	TimeFieldc                st   t ƒ  ||¡}d|jkr<|dkr$dS |dkr0dS |dkr<dS |jrf|dkrNdS |dkrZd	S |dkrfd
S |jrpdS |S )NÚauto_incrementr   Z	AutoFieldr   ZBigAutoFieldr   ZSmallAutoFieldZPositiveBigIntegerFieldZPositiveIntegerFieldZPositiveSmallIntegerFieldr   )ÚsuperÚget_field_typer	   r
   r   )ÚselfZ	data_typeÚdescriptionZ
field_type)Ú	__class__© úJ/tmp/pip-install-o3oxmrkh/Django/django/db/backends/mysql/introspection.pyr   -   s$    
z$DatabaseIntrospection.get_field_typec             C   s   |  d¡ dd„ | ¡ D ƒS )z>Return a list of table and view names in the current database.zSHOW FULL TABLESc             S   s*   g | ]"}t |d  dddœ |d ¡ƒ‘qS )r   ÚtÚv)z
BASE TABLEZVIEWé   )r   Úget)Ú.0Úrowr   r   r   ú
<listcomp>F   s   z8DatabaseIntrospection.get_table_list.<locals>.<listcomp>)ÚexecuteÚfetchall)r   Úcursorr   r   r   Úget_table_listC   s    
z$DatabaseIntrospection.get_table_listc             C   s,  i }| j jr6| j jjr6| d|g¡ dd„ | ¡ D ƒ}| d|g¡ | ¡ }|rX|d nd}| d||g¡ dd	„ | ¡ D ƒ}| d
| j j |¡ ¡ dd„ }g }x„|j	D ]z}	||	d  }
| 
t|	dd… ||
jƒpÚ|	d ||
jƒpê|	d ||
jƒpú|	d |	d |
j|
j|
j|
j|	d |kf	žŽ ¡ qªW |S )zj
        Return a description of the table with the DB-API cursor.description
        interface."
        aZ  
                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   r   ú	<setcomp>Z   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   Ú a@  
            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 | ]}t |Ž |d  “qS )r   )r   )r   Úliner   r   r   ú
<dictcomp>x   s    z?DatabaseIntrospection.get_table_description.<locals>.<dictcomp>zSELECT * FROM %s LIMIT 1c             S   s   | d k	rt | ƒS | S )N)Úint)Úir   r   r   Úto_int|   s    z;DatabaseIntrospection.get_table_description.<locals>.to_intNé   é   é   é   )Ú
connectionÚmysql_is_mariadbÚfeaturesZcan_introspect_json_fieldr!   r"   ÚfetchoneÚopsÚ
quote_namer   Úappendr   Úmax_lenZnum_precZ	num_scaleZcolumn_defaultZ	collationr	   r
   )r   r#   Ú
table_nameZjson_constraintsr   Zdefault_column_collationÚ
field_infor+   Úfieldsr'   Úinfor   r   r   Úget_table_descriptionI   s:    


z+DatabaseIntrospection.get_table_descriptionr   c             C   s2   x,|   ||¡D ]}d|jkr||jdœgS qW g S )Nr   )ÚtableÚcolumn)r<   r	   Úname)r   r#   r8   Ztable_fieldsr9   r   r   r   Úget_sequences�   s    
z#DatabaseIntrospection.get_sequencesc             C   s4   |   ||¡}i }x|D ]\}}}||f||< qW |S )z—
        Return a dictionary of {field_name: (field_name_other_table, other_table)}
        representing all relationships to the given table.
        )Úget_key_columns)r   r#   r8   ÚconstraintsZ	relationsZmy_fieldnameZother_tableZother_fieldr   r   r   Úget_relations—   s
    z#DatabaseIntrospection.get_relationsc             C   s$   g }|  d|g¡ | | ¡ ¡ |S )z�
        Return a list of (column_name, referenced_table_name, referenced_column_name)
        for all key columns in the given table.
        a@  
            SELECT column_name, referenced_table_name, referenced_column_name
            FROM information_schema.key_column_usage
            WHERE table_name = %s
                AND table_schema = DATABASE()
                AND referenced_table_name IS NOT NULL
                AND referenced_column_name IS NOT NULL)r!   Úextendr"   )r   r#   r8   Zkey_columnsr   r   r   rA   ¢   s
    
z%DatabaseIntrospection.get_key_columnsc             C   s,   |  d|g¡ | ¡ }|s$| 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   r0   r2   Z_mysql_storage_engine)r   r#   r8   Úresultr   r   r   Úget_storage_engine²   s    
z(DatabaseIntrospection.get_storage_enginec             C   s‚   t ƒ }t |¡d }dd„ | ¡ D ƒ}xV|D ]N}|jtjjkr,| jj 	|j
¡|j
kr,|j
dd… |kr,| |j
dd… ¡ q,W |S )Nr   c             s   s   | ]}|j s|V  qd S )N)Zis_whitespace)r   Útokenr   r   r   ú	<genexpr>Ã   s    zBDatabaseIntrospection._parse_constraint_columns.<locals>.<genexpr>r   éÿÿÿÿ)r   ÚsqlparseÚparseÚflattenZttypeÚtokensÚNamer0   r4   r5   ÚvalueÚadd)r   Úcheck_clauseÚcolumnsZcheck_columnsZ	statementrM   rG   r   r   r   Ú_parse_constraint_columnsÀ   s    
z/DatabaseIntrospection._parse_constraint_columnsc             C   sš  i }d}|  ||g¡ xl| ¡ D ]`\}}}}||krntƒ dddd|rL||fnddœ||< | jjjrng || d< || d  |¡ q W d}	|  |	|g¡ xR| ¡ D ]F\}}
|
 ¡ dkrÎd	|| d
< d	|| d< q |
 ¡ dkr d	|| d< q W | jjj�rŒd}dd„ |  	||¡D ƒ}| jj
�r d}	nd}	|  |	|g¡ xX| ¡ D ]L\}}|  ||¡}t|ƒ|hk�rp|d7 }d| }|dddd	ddœ||< �q<W |  d| jj |¡ ¡ xÌdd„ | ¡ D ƒD ]¶\}}}}}}}||k�rtƒ dddddœ||< | jjj�rg || d< d	|| d< |dk�rtjn| ¡ || d< || d  |¡ | jjj�r¸|| d  |dk�rfdnd¡ �q¸W x"| ¡ D ]}t|d ƒ|d< �q|W |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)rR   Úprimary_keyÚuniqueÚindexÚcheckÚforeign_keyZordersrR   zà
            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 keyTrT   rU   r   c             S   s   h | ]
}|j ’qS r   )r?   )r   r;   r   r   r   r%   ý   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__zSHOW INDEX FROM %sc             S   s"   g | ]}|d d… |d f ‘qS )Nr/   é
   r   )r   Úxr   r   r   r    '  s    z9DatabaseIntrospection.get_constraints.<locals>.<listcomp>)rR   rT   rU   rW   rX   rV   ZBTREEÚtypeÚDZDESCÚASC)r!   r"   r   r0   r2   Zsupports_index_column_orderingrP   ÚlowerZ can_introspect_check_constraintsr<   r1   rS   Úsetr4   r5   r   Úsuffixr6   ÚvaluesÚlist)r   r#   r8   rB   Z
name_queryÚ
constraintr>   Z	ref_tableZ
ref_columnZ
type_queryÚkindZunnamed_constraints_indexrR   rQ   Zconstraint_columnsr=   Z
non_uniquerV   ZcolseqÚorderÚtype_r   r   r   Úget_constraintsÍ   sv    


$
 &z%DatabaseIntrospection.get_constraints)r   )$Ú__name__Ú
__module__Ú__qualname__r   ZBLOBZCHARZDECIMALZ
NEWDECIMALZDATEZDATETIMEZDOUBLEÚFLOATZINT24ZJSONÚLONGZLONGLONGZSHORTÚSTRINGZTIMEÚ	TIMESTAMPZTINYZ	TINY_BLOBZMEDIUM_BLOBZ	LONG_BLOBZ
VAR_STRINGZdata_types_reverser   r$   r<   r@   rC   rA   rF   rS   rg   Ú__classcell__r   r   )r   r   r      s<   
G
r   )Úcollectionsr   rJ   ZMySQLdb.constantsr   Z%django.db.backends.base.introspectionr   r   ZBaseFieldInfor   Zdjango.db.modelsr   Zdjango.utils.datastructuresr   Ú_fieldsr   r   r   r   r   r   Ú<module>   s   