如何在SQL Server中插入前导零

Question

这是使用前导零选择的代码:

SELECT RIGHT('00000'+ CONVERT(VARCHAR,Asset_No),6) 
  FROM schemaAsset.SystemDefined

如何使用前导零将值插入Asset_no列？

例如我只在"Asset_no"列中插入"1",但在代码中,它将插入"000001".而且当我插入两个数字如26时,它将插入为"000026".长度不会改变.这可能在SQL Server中吗？

Answer 1

一种方法是使用INSTEAD OF触发器.

USE tempdb;
GO

CREATE TABLE dbo.whatever
(
  Asset_No VARCHAR(6)
);
GO

CREATE TRIGGER dbo.fix_whatever
ON dbo.whatever
INSTEAD OF INSERT
AS
BEGIN
  SET NOCOUNT ON;
  INSERT dbo.whatever(Asset_No /*, other columns */)
    SELECT RIGHT('000000' + CONVERT(VARCHAR(6), Asset_No), 6)
      /*, other columns */
    FROM inserted;
END
GO

INSERT dbo.whatever(Asset_No) SELECT '22';
GO

SELECT Asset_No FROM dbo.whatever;
GO

结果:

Asset_No
--------
000022