在存储过程中更改视图

Question

我们如何改变存储过程中的视图？

create procedure createviewupdatepenaltypointsconsecutive
as
begin
alter VIEW consecutive
as


WITH cte as (
    SELECT *, 
           LAG([pointsRewarded], 1) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev1_points,
           LAG([pointsRewarded], 2) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev2_points,
           LAG([pointsRewarded], 3) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev3_points
    FROM week1
)
SELECT *,
       CASE WHEN [pointsRewarded] = -10 AND prev1_points = -10  AND prev2_points = -10  AND prev3_points = -10 
            THEN -200
            WHEN [pointsRewarded] = -10 AND prev1_points = -10  AND prev2_points = -10 
            THEN -100
            WHEN [pointsRewarded] = -10 AND prev1_points = -10
            THEN -50
            ELSE 0
       END penalty       
FROM cte

end

M 收到此错误： 消息 156，级别 15，状态 1，过程 createviewupdatepenaltypointsconsecutive，第 4 行 关键字“VIEW”附近的语法不正确。 消息 319，级别 15，状态 1，过程 createviewupdatepenaltypointsconsecutive，第 8 行 关键字“with”附近的语法不正确。如果这个语句是一个公用表表达式、一个 xmlnamespaces 子句或一个更改跟踪上下文子句，则前面的语句必须以分号结束。

Answer 1

您将无法像在存储过程中那样运行ALTER VIEW 语句。因此，要解决您的问题，您必须采取 2 项措施：

1) 要更正当前出现的错误，您必须在 CTE 开头使用分号，如下所示：

WITH cte as (
    SELECT *, 
       LAG([pointsRewarded], 1) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev1_points,
       LAG([pointsRewarded], 2) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev2_points,
       LAG([pointsRewarded], 3) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev3_points
FROM week1)
SELECT *,
   CASE WHEN [pointsRewarded] = -10 AND prev1_points = -10  AND prev2_points = -10  AND prev3_points = -10 
        THEN -200
        WHEN [pointsRewarded] = -10 AND prev1_points = -10  AND prev2_points = -10 
        THEN -100
        WHEN [pointsRewarded] = -10 AND prev1_points = -10
        THEN -50
        ELSE 0
   END penalty       
FROM cte

（或者更好地开始使用分号终止所有 SQL 语句，因为不推荐使用替代方法）。

2) 将您的 alter view 语句转换为动态 SQL 字符串并使用 sp_executesql 执行它，因为 ALTER VIEW 语句必须是批处理中的第一个：

CREATE PROCEDURE createviewupdatepenaltypointsconsecutive
AS
BEGIN
   DECLARE @STMT AS NVARCHAR(MAX) =
   '
  ALTER VIEW consecutive
  AS


  WITH cte as (
      SELECT *, 
             LAG([pointsRewarded], 1) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev1_points,
             LAG([pointsRewarded], 2) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev2_points,
             LAG([pointsRewarded], 3) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev3_points
      FROM week1
  )
  SELECT *,
         CASE WHEN [pointsRewarded] = -10 AND prev1_points = -10  AND prev2_points = -10  AND prev3_points = -10 
              THEN -200
              WHEN [pointsRewarded] = -10 AND prev1_points = -10  AND prev2_points = -10 
              THEN -100
              WHEN [pointsRewarded] = -10 AND prev1_points = -10
              THEN -50
              ELSE 0
         END penalty       
  FROM cte
   '
   EXEC sp_executesql @STMT;
END