Openquery SQL如何检查是否存在？

Question

我正在使用sql OPENQUERY检查记录是否存在通过参数更新它，如果没有插入新记录。

这是我到目前为止所拥有的

DECLARE @sql VARCHAR (8000)
DECLARE @Id VARCHAR(20)

SET @Id= '31124'

SET @sql = '
SELECT * FROM OPENQUERY
(
   SERVERNAME, 
   ''
   SELECT Name FROM table WHERE Id= ''''' + @Id +  ''''' 
   ''
)'
EXEC (@sql)

Answer 1

DECLARE @sql VARCHAR (8000)
DECLARE @Id VARCHAR(20)

SELECT @Id= '31124'

SELECT @sql =
'
IF EXISTS
(
    SELECT * FROM OPENQUERY
    (
        SERVERNAME, 
        ''SELECT Name FROM table WHERE Id= ''''' + @Id +  '''''''
    )
) 
BEGIN  
    UPDATE OPENQUERY
    (
        SERVERNAME, 
        ''SELECT Name FROM table WHERE Id= ''''' + @Id +  '''''''
    )   
    SET Name = ''NewName''
ELSE
    INSERT OPENQUERY
    (
        SERVERNAME, 
        ''SELECT Name FROM table''
    )   
    VALUES
    (
        ''NewName''
    )
END 
'

EXEC (@sql)

---

除非您有特定要求使用EXEC，否则您不需要它。

DECLARE @Id VARCHAR(20)

SELECT @Id= '31124'

IF EXISTS
(
    SELECT * FROM OPENQUERY
    (
        SERVERNAME, 
        'SELECT Name FROM table WHERE Id= ''' + @Id +  ''''
    )
) 
BEGIN  
    UPDATE OPENQUERY
    (
        SERVERNAME, 
        'SELECT Name FROM table WHERE Id= ''' + @Id +  ''''
    )   
    SET Name = 'NewName'
ELSE
    INSERT OPENQUERY
    (
        SERVERNAME, 
        'SELECT Name FROM table'
    )   
    VALUES
    (
        'NewName'
    )
END