a
    xdp                     @   sh   d Z ddlmZmZ G dd deZG dd deZG dd deZG d	d
 d
eZG dd deZdS )z;Database functions that do comparisons or type conversions.    )FuncValuec                       s\   e Zd ZdZdZdZ fddZ fddZ fdd	Zd
d Z	dd Z
 fddZ  ZS )Castz)Coerce an expression to a new field type.ZCASTz,%(function)s(%(expressions)s AS %(db_type)s)c                    s   t  j||d d S )N)output_field)super__init__)self
expressionr   	__class__ ]/var/www/html/Ranjet/env/lib/python3.9/site-packages/django/db/models/functions/comparison.pyr   
   s    zCast.__init__c                    s&   | j ||d< t j||fi |S )Ndb_type)r   Zcast_db_typer   as_sqlr   compiler
connectionextra_contextr
   r   r   r      s    zCast.as_sqlc           	         s   | j |}|dv rZd}t j||fd|i|\}}|dkrBdnd}|d| ||fS |dkrd	}t j||fd|i|S | j||fi |S )
N>   timedatetimezstrftime(%%s, %(expressions)s)templater   z%H:%M:%fz%Y-%m-%d %H:%M:%fr   datezdate(%(expressions)s))r   r   r   r   insert)	r   r   r   r   r   r   Zsqlparamsformat_stringr
   r   r   	as_sqlite   s    zCast.as_sqlitec                 K   sF   d }| j  }|dkrd}n|dkr.|jr.d}| j||fd|i|S )NZ
FloatFieldz(%(expressions)s + 0.0)	JSONFieldz"JSON_EXTRACT(%(expressions)s, '$')r   )r   get_internal_typeZmysql_is_mariadbr   )r   r   r   r   r   output_typer   r   r   as_mysql   s    
zCast.as_mysqlc                 K   s   | j ||fddi|S )Nr   z(%(expressions)s)::%(db_type)s)r   r   r   r   r   as_postgresql*   s    zCast.as_postgresqlc                    s@   | j  dkr,d}t j||fd|i|S | j||fi |S )Nr   z JSON_QUERY(%(expressions)s, '$')r   )r   r   r   r   )r   r   r   r   r   r
   r   r   	as_oracle0   s    zCast.as_oracle)__name__
__module____qualname____doc__functionr   r   r   r   r   r    r!   __classcell__r   r   r
   r   r      s   r   c                       s0   e Zd ZdZdZ fddZ fddZ  ZS )Coalescez:Return, from left to right, the first non-null expression.ZCOALESCEc                    s*   t |dk rtdt j|i | d S )N   z+Coalesce must take at least two expressionslen
ValueErrorr   r   r   Zexpressionsextrar
   r   r   r   <   s    zCoalesce.__init__c                    s\   | j  dkrH|  }|dd |  D  tt|j||fi |S | j||fi |S )NZ	TextFieldc                 S   s   g | ]}t |d dqS )ZTO_NCLOB)r&   )r   ).0r	   r   r   r   
<listcomp>F   s   z&Coalesce.as_oracle.<locals>.<listcomp>)r   r   copyZset_source_expressionsget_source_expressionsr   r(   r   )r   r   r   r   cloner
   r   r   r!   A   s    
zCoalesce.as_oracle)r"   r#   r$   r%   r&   r   r!   r'   r   r   r
   r   r(   8   s   r(   c                       s0   e Zd ZdZdZ fddZ fddZ  ZS )Greatestz
    Return the maximum expression.

    If any expression is null the return value is database-specific:
    On PostgreSQL, the maximum not-null expression is returned.
    On MySQL, Oracle, and SQLite, if any expression is null, null is returned.
    ZGREATESTc                    s*   t |dk rtdt j|i | d S )Nr)   z+Greatest must take at least two expressionsr*   r-   r
   r   r   r   W   s    zGreatest.__init__c                    s   t  j||fddi|S )zUse the MAX function on SQLite.r&   MAXr   r   r   r
   r   r   r   \   s    zGreatest.as_sqliter"   r#   r$   r%   r&   r   r   r'   r   r   r
   r   r4   M   s   r4   c                       s0   e Zd ZdZdZ fddZ fddZ  ZS )Leastz
    Return the minimum expression.

    If any expression is null the return value is database-specific:
    On PostgreSQL, return the minimum not-null expression.
    On MySQL, Oracle, and SQLite, if any expression is null, return null.
    ZLEASTc                    s*   t |dk rtdt j|i | d S )Nr)   z(Least must take at least two expressionsr*   r-   r
   r   r   r   k   s    zLeast.__init__c                    s   t  j||fddi|S )zUse the MIN function on SQLite.r&   ZMINr6   r   r
   r   r   r   p   s    zLeast.as_sqliter7   r   r   r
   r   r8   a   s   r8   c                       s$   e Zd ZdZdZ fddZ  ZS )NullIfZNULLIFr)   c                    s>   |   d }t|tr(|jd u r(tdt j||fi |S )Nr   z2Oracle does not allow Value(None) for expression1.)r2   
isinstancer   valuer,   r   r   )r   r   r   r   Zexpression1r
   r   r   r!   y   s    zNullIf.as_oracle)r"   r#   r$   r&   arityr!   r'   r   r   r
   r   r9   u   s   r9   N)	r%   Zdjango.db.models.expressionsr   r   r   r(   r4   r8   r9   r   r   r   r   <module>   s   3