How to properly run ALTER VIEW after ALTER TABLE

Question

Lets say I have this SQL statements:

ALTER TABLE dbo.[tbl] ALTER COLUMN col1 varchar(300)
ALTER TABLE dbo.[tbl] ALTER COLUMN col2 varchar(20)
ALTER TABLE dbo.[tbl] ALTER COLUMN col3 varchar(20)
ALTER TABLE dbo.[tbl] ALTER COLUMN col4 varchar(100)

I have put these statements inside a file to be run one after the other. I also have a VIEW that is looking at dbo.[tbl]. I noticed that after running the 4 statements above the VIEW retains the old column lengths. So I added the following code to the end of the file:

ALTER  VIEW [dbo].[tbl]
AS
SELECT col1, col2, col3, col4
FROM   dbo.[tbl]

The error that I get is

'ALTER VIEW' must be the first statement in a query batch

So my question is, what is the best way to ensure that my VIEW retains the new column lengths?

Answer 1

出于此特定目的，请使用sp_refreshview 。

exec sp_refreshview N'dbo.tbl'

Answer 2

Use GO statements:

ALTER TABLE dbo.[tbl] ALTER COLUMN col1 varchar(300)
ALTER TABLE dbo.[tbl] ALTER COLUMN col2 varchar(20)
ALTER TABLE dbo.[tbl] ALTER COLUMN col3 varchar(20)
ALTER TABLE dbo.[tbl] ALTER COLUMN col4 varchar(100)
GO

ALTER  VIEW [dbo].[tbl]
AS
SELECT col1, col2, col3, col4
FROM   dbo.[tbl]
GO