小编Kri*_*h T的帖子

我需要查询一个表，并且可以根据前端选择的选项在 WHERE 子句中传递一个或最多六个参数。我在 WHERE 子句中使用了 CASE 语句来处理所有排列。

这是 SP 代码片段：

create procedure return_data ( 
     p_field1 in varchar(20), 
     p_field2 in varchar2(30), 
     p_field3 in varchar2(30), 
     cur out sys_refcursor)
is 
begin
    open cur for
        select col1, col2, col3,col4,col5,col6 
        from master_table
        where (case when (p_field1 is null) then (1) 
                   when (p_field1 is not null) and (col1=p_field1) then 1 
                   else 0 end) =1 
       and (case when (p_field2 is null) then (1) 
                 when (p_field2 is not null) and (col2=p_field2) then 1 
                 else 0 end) =1 
      ... …