我有以下四个参数的存储过程.
存储过程spTest：
CREATE PROCEDURE spTest
@Name varchar(20) = '',@Address varchar(100) = '',@City varchar(50) = '',@Pin varchar(50) = ''
AS
DECLARE @DynamicWhere varchar(max)
DECLARE @Query varchar(max)
/* Here I want to prepare a dynamic where clause for all possibilities */
SET @Query = 'SELECT * FROM Test_Table '+ @DynamicWhere +'';
EXECUTE(@Query);
GO
好吧,我正在准备这样：
IF @Name = '' AND @Address = '' AND @City = '' AND @Pin = ''
BEGIN
SET @DynamicWhere = '';
END
ELSE IF @Name != '' AND @Address = '' AND @City = '' AND @Pin = ''
BEGIN
SET @DynamicWhere = 'Name ='''+@Name+'''';
END
ELSE IF @Name != '' AND @Address != '' AND @City = '' AND @Pin = ''
BEGIN
SET @DynamicWhere = 'Name ='''+@Name+''' AND Address ='''+@Address+'''';
END
......
......
Many possibilities
解决方法
它被称为catch-all查询,它基本上是这样的：
CREATE PROCEDURE spTest
@Name varchar(20) = '',@Pin varchar(50) = ''
AS
SELECT *
FROM Test_Table
WHERE (@Name = '' OR Name = @Name)
AND (@Address = '' OR Address = @Address)
AND (@City = '' OR City = @City)
AND (@Pin = '' OR Pin = @Pin);
GO
