SQL Server存储过程sp_executesql

我有这个存储过程SQL Server存储过程sp_executesql

USE [all_things] 
GO 
SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 

ALTER PROCEDURE [dbo].[sp_getThingsByType] 
    @thingid int, 
    @typeid int 
AS 

DECLARE @Sql NVARCHAR(MAX) = 'SELECT * from items' 

IF @thingid IS NOT NULL 
BEGIN 
    SET @Sql += ' where thingid = @thingid' 
END 

IF @typeid IS NOT NULL 
BEGIN 
    SET @Sql += ' and TypeID = @typeid' 
END 

EXEC sp_executesql @sql, N'@thingid int,@typeid int',@[email protected],@[email protected];

测试用例：

当我运行它thingid是null和typeid是null，我得到的所有结果是完善。
当thingid供应和typeid是null，结果是OK
这里是哪里，结果并不好：thingid是null和typeid供应。一切都被退回。

我错过了什么？

谢谢

来源

2013-04-04 mpora

imho，如果thingid为空而不是typeid，则表示有一个格式不正确的查询，它们看起来像是select * from items和TypeID = @ typeid'。 – tschmit007 2013-04-04 15:31:28

我没有看到。谢谢 – mpora 2013-04-04 15:34:29

感谢@ tschmit007，我修好了。

USE [all_things] 
GO 
SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 

ALTER PROCEDURE [dbo].[sp_getThingsByType] 
    @thingid int, 
    @typeid int 
AS 

DECLARE @Sql NVARCHAR(MAX) = 'SELECT * from items' 

IF @thingid IS NOT NULL 
BEGIN 
    SET @Sql += ' where thingid = @thingid' 
END 

IF @typeid IS NOT NULL AND @thingid IS NOT NULL 
BEGIN 
    SET @Sql += ' and TypeID = @typeid' 
END 

IF @typeid IS NOT NULL AND @thingid IS NULL 
BEGIN 
    SET @Sql += ' where TypeID = @typeid' 
END 

EXEC sp_executesql @sql, N'@thingid int,@typeid int',@[email protected],@[email protected];

来源

2013-04-04 15:40:14 mpora

SQL Server存储过程sp_executesql

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