21.动态参数存储过程

朱雀 2024-02-19 17:47 40阅读 0赞

--1. 使用 EXEC 实现的动态参数存储过程
    CREATE PROC p_test
    @para1 varchar(10)=null,
    @para2 varchar(10)=null,
    @para3 varchar(10)=null,
    @para4 varchar(10)=null
    AS
    SET NOCOUNT ON
    DECLARE @sql varchar(8000)
    SET @sql='SELECT * FROM tbname WHERE 1=1'
    IF @para1 IS NOT NULL
    	SET @sql=@sql+' AND col1='''+@para1+''''
    IF @para2 IS NOT NULL
    	SET @sql=@sql+' AND col2='''+@para2+''''
    IF @para3 IS NOT NULL
    	SET @sql=@sql+' AND col3='''+@para3+''''
    IF @para4 IS NOT NULL
    	SET @sql=@sql+' AND col4='''+@para4+''''
    EXEC(@sql)
    GO
    
    
    /*======================================================*/
    
    --2. 使用 sp_executesql 实现的动态参数存储过程
    CREATE PROC p_test
    @para1 varchar(10)=null,
    @para2 datetime=null,
    @para3 varchar(10)=null,
    @para4 int=null
    AS
    SET NOCOUNT ON
    DECLARE @sql nvarchar(4000)
    SET @sql='SELECT * FROM tbname WHERE 1=1'
    	+CASE WHEN @para1 IS NULL THEN '' ELSE ' AND col1=@para1' END
    	+CASE WHEN @para2 IS NULL THEN '' ELSE ' AND col2=@para2' END
    	+CASE WHEN @para3 IS NULL THEN '' ELSE ' AND col3=@para3' END
    	+CASE WHEN @para4 IS NULL THEN '' ELSE ' AND col4=@para4' END
    EXEC sp_executesql @sql,N'
    	@para1 varchar(10)=null,
    	@para2 datetime=null,
    	@para3 varchar(10)=null,
    	@para4 int=null
    ',@para1,@para2,@para3,@para4
    GO
    
    
    /*======================================================*/
    
    --3. 不使用动态 Transact-SQL 语句实现的动态参数存储过程
    CREATE PROC p_test
    @para1 varchar(10)=null,
    @para2 datetime=null,
    @para3 varchar(10)=null,
    @para4 int=null
    AS
    SET NOCOUNT ON
    SELECT * FROM tbname 
    WHERE (@para1 IS NULL OR col1=@para1)
    	AND (@para2 IS NULL OR col2=@para2)
    	AND (@para3 IS NULL OR col3=@para3)
    	AND (@para4 IS NULL OR col4=@para4)