sql-server - sql server 存储过程 sp_executesql

Question

我有这个存储过程

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',@thingid=@thingid,@typeid=@typeid;

测试用例：

1. 当我用thingidisnull和typeidis运行它时null，我得到了所有完美的结果。

2. 当thingid提供了并且typeid是null时，结果是好的

3. 这是结果不好的地方：thingidisnull和typeidis 供应。一切都在归还。

我错过了什么？

谢谢

Answer 1

感谢@tschmit007，我修复了它。

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',@thingid=@thingid,@typeid=@typeid;