CREATE VIEW與生存確認

Question

我試圖做到這一點：

IF NOT EXISTS (
SELECT * 
FROM sys.objects 
WHERE object_id = OBJECT_ID(N'[dbo].[viewName]') 
AND type in (N'U') 
) 

CREATE VIEW [dbo].[viewName] AS 
-- Such and such 
GO 

這將引發「‘CREATE VIEW’必須是唯一的語句在批處理」的錯誤。

我已經嘗試了here（使用BEGIN/END環繞）和here（使用GO語句，使用動態SQL）的建議，但都沒有減輕錯誤。

Answer 1

試試這個邏輯，你的一點關閉;

IF NOT EXISTS (SELECT * FROM dbo.sysobjects WHERE object_id= object_id(N'[dbo].[ViewName]') AND OBJECTPROPERTY(object_id, N'IsView') = 1) 

我說實話，我總是放棄並重新創建，以確保您運行的是最新版本的視圖，像這樣;

IF EXISTS (SELECT * FROM dbo.sysobjects WHERE object_id= object_id(N'[dbo].[ViewName]') AND OBJECTPROPERTY(object_id, N'IsView') = 1) 
BEGIN 
    DROP VIEW [dbo].ViewName 
END 
GO 

CREATE VIEW ViewName 
AS 
    SELECT 

是的，所以檢查您要使用動態SQL的評論;

IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[viewName]') AND OBJECTPROPERTY(object_id, N'IsView') = 1) 
BEGIN 
DECLARE @sql nvarchar(MAX) 
--SELECT 'Do this mofo' 
SET @sql = N'CREATE VIEW [dbo].[viewName] 
      AS 
      SELECT COUNT(1) FieldName FROM sys.objects' 

EXEC sp_executesql @sql 

END 
GO 

Answer 2

這是您目前使用SQL 2016 SP1的可能性不大，但對於後人，你現在可以做

CREATE OR ALTER VIEW ... https://stackoverflow.com/a/40707436/155892

Answer 3

可能是這樣的：

DECLARE @cmd NVARCHAR(MAX)=N'CREATE VIEW ....;'; 

IF EXISTS(SELECT 1 FROM INFORMATION_SCHEMA.VIEWS AS v WHERE v.TABLE_NAME='ViewName') --yes, it's TABLE_NAME! 
    SET @cmd=STUFF(@cmd,1,6,N'ALTER'); 

EXEC(@cmd);