在SQL Server

Question

我想执行此查询，如您所见：

DECLARE @site_value INT;
SET @site_value = 1310;

WHILE @site_value <= 1396
BEGIN
  ALTER DATABASE AdventureWorksDW
  ADD FILE
  (NAME = N'data_2002',

  FILENAME = N'C:\symfadb2filegroup\data_'+@site_value+'.ndf',
  SIZE = 5000MB,
  MAXSIZE = 10000MB,
  FILEGROWTH = 500MB)
  TO FILEGROUP [Filegroup_2002]

   SET @site_value = @site_value + 1;
END;

但我在这部分+@site_value

中收到此错误

  

Msg 102，Level 15，State 1，Line 10
  “+”附近的语法不正确。

我使用了CONVERT和CONCAT，但我得到了同样的错误。

Answer 1

你需要使用如下的动态sql

 set @Sql=' ALTER DATABASE AdventureWorksDW
  ADD FILE
  (NAME = N''data_2002''

  FILENAME = N''C:\symfadb2filegroup\data_'''+cast(@site_value  as varchar(4))+'.ndf'',
  SIZE = 5000MB,
  MAXSIZE = 10000MB,
  FILEGROWTH = 500MB)
  TO FILEGROUP [Filegroup_2002]'
  print @Sql

以下总代码

DECLARE @site_value INT;
SET @site_value = 1310;

declare @Sql nvarchar(max)

WHILE @site_value <= 1396
BEGIN
 set @Sql=' ALTER DATABASE AdventureWorksDW
  ADD FILE
  (NAME = N''data_2002''

  FILENAME = N''C:\symfadb2filegroup\data_'''+cast(@site_value  as varchar(4))+'.ndf'',
  SIZE = 5000MB,
  MAXSIZE = 10000MB,
  FILEGROWTH = 500MB)
  TO FILEGROUP [Filegroup_2002]'
  print @Sql
  exec(@sql)


   SET @site_value = @site_value + 1;
END;