sql存储过程中加引号

ALTER PROCEDURE [dbo].[SaveTerminaInfo]
 @TerminaNo NVARCHAR(50),
 @Name NVARCHAR(50),
 @Value NVARCHAR(500)
AS
BEGIN
 DECLARE @Sql NVARCHAR (MAX)
 SET NOCOUNT ON;
 
 if NOT exists(select * from syscolumns where id=object_id('终端信息') and name=@Name)
 BEGIN
 SET @Sql = N'ALTER TABLE 终端信息 ADD ' +  @Name + ' NVARCHAR(50)';
 EXEC(@Sql);
 PRINT @Sql;
 END

SET @Sql = N'UPDATE 终端信息' + ' SET '+ quotename(@Name) +' = ' + ''''+ @Value + '''' + ' WHERE 编号' +' = ' + ''''+ @TerminaNo +''''
  EXEC(@Sql);
END
GO

执行如下：

EXEC [dbo].[SaveTerminaInfo]
 @TerminaNo ='31',
 @Name='工号',
    @Value='syl'