derby中的条件语句

那怎么办 http://db.apache.org/derby/docs/10.2/ref/rrefcasenullif.html#rrefcasenullif ?

   CASE
      WHEN 1 = 2 THEN 3
      WHEN 4 = 5 THEN 6
      ELSE 7
   END

所以也许你可以尝试一下:

CASE
 WHEN  select 1 from customers where name='somename' = 1 THEN update...
ELSE  insert...
END

我不知道这是否可行,但这似乎是个开始。祝你好运!

编辑:

我知道这可能太晚了,但万一有人还在找:

https://issues.apache.org/jira/browse/DERBY-3155

例如:

MERGE INTO customers USING SYSIBM.SYSDUMMY1 ON customers.name='somename' WHEN MATCHED THEN UPDATE SET name = 'someothername', ... WHEN NOT MATCHED THEN INSERT(id, name, ...) VALUES (DEFAULT, 'someothername', ...)