什么是通过SQL更新单个记录并获取更新记录的id的最佳方法？(爪哇/ MSSQL)

Question

我知道我可以像这样更新一条记录 - 但是如何才能访问已更新的记录的id？(我正在使用MSSQL,所以我不能使用Oracles RowId)

update myTable
set myCol = 'foo'
where itemId in (select top 1 itemId from myTable )

如果我正在使用插入,我可以使用getGeneratedKeys来获取id字段值,但我认为没有相应的更新？

我知道我可以使用可滚动的结果集来做我想要的

即

stmt = conn.prepareStatement("select top 1 myCol, itemId from myTable", ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
ResultSet resultSet = stmt.executeQuery();
if(resultSet.first()){
    resultSet.updateString(1, "foo");
    resultSet.updateRow();
    String theItemId = resultSet.getString(1)
}
resultSet.close();

但我担心性能,因为测试显示负载下的锁定超时,我想知道是否有更好/更简单的方法？

- 编辑:刚刚完成这个问题......当我们迁移到MSSQL2005时,我们将升级我们的代码以使用Rich的答案.在当前版本中,我们使用了锁提示:(UPDLOCK ROWLOCK READPAST)来缓解原始代码显示的性能问题.

Answer 1

这个例子在MSSQL 2005中运行得很好......

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

DROP TABLE [dbo].[TEST_TABLE]
GO

CREATE TABLE [dbo].[TEST_TABLE](
    [id] [int] IDENTITY(1,1) NOT NULL,
    [name] [nvarchar](100) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
 CONSTRAINT [PK_TEST_TABLE] PRIMARY KEY CLUSTERED 
(
    [id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]


-- An insert which will return the identity
INSERT INTO [dbo].[TEST_TABLE] ([name]) 
OUTPUT inserted.id
VALUES('Test 1')

-- Another insert which will return the identity
INSERT INTO [dbo].[TEST_TABLE] ([name]) 
OUTPUT inserted.id
VALUES('Test 2')

-- Now an update which will return the identity
UPDATE [dbo].[TEST_TABLE]
SET [name] = 'Updated Test 1'
OUTPUT inserted.id
WHERE [name] = 'Test 1'

SELECT id, [name] FROM [dbo].[TEST_TABLE]

更具体地说,你的查询......

update myTable
set myCol = 'foo'
output inserted.itemid
where itemId in (select top 1 itemId from myTable )