带有可选"WHERE"参数的存储过程

Question

我有一个表单,用户可以指定各种参数来挖掘一些数据(状态,日期等).

我可以生成一个查询:

SELECT * FROM table WHERE:
status_id = 3
date = <some date>
other_parameter = <value>

每个WHERE都是可选的(我可以选择所有行status = 3,或所有行date = 10/10/1980,或所有行status = 3 AND date = 10/10/1980等).

给定大量参数,都是可选的,构成动态存储过程的最佳方法是什么？

我正在研究各种数据库,例如:MySQL,Oracle和SQLServer.

Answer 1

完成此任务的最简单方法之一:

SELECT * FROM table 
WHERE ((@status_id is null) or (status_id = @status_id))
and ((@date is null) or ([date] = @date))
and ((@other_parameter is null) or (other_parameter = @other_parameter))

这完全消除了动态sql,并允许您搜索一个或多个字段.通过消除动态sql,您删除了有关sql注入的另一个安全问题.

Answer 2

像这样创建你的程序:

CREATE PROCEDURE [dbo].[spXXX]
    @fromDate datetime = null,
    @toDate datetime = null,
    @subCode int = null
as
begin
set NOCOUNT ON
/* NOCOUNT limits the server feedback on select results record count */
SELECT
    fields...
FROM
    source
WHERE
    1=1
--Dynamic where clause for various parameters which may or may not be passed in.
and ( @fromDate is null or [dateField] >= @fromDate)
and ( @toDate is null or [dateField] <= @toDate)
and ( @subCode is null or subCode= @leaveTypeSubCode)
order by fields...

这将允许您使用0参数,所有参数或任何#srms执行该过程.

Answer 3

这是我使用的风格:

T-SQL

SELECT    *        
FROM    table        
WHERE     
status_id    =    isnull(@status_id ,status_id)     
and    date    =    isnull(@date ,date )     
and    other_parameter    =    isnull(@other_parameter,other_parameter) 

神谕

SELECT    *        
FROM    table        
WHERE     
status_id    =    nval(p_status_id ,status_id)     
and    date    =    nval(p_date ,date )     
and    other_parameter    =    nval(p_other_parameter,other_parameter)