意外令牌「LIMIT」

Question

我的Rails應用程序連接到遠程DB2數據庫，並遷移時，我跌進這個錯誤：

== DropLegacyProject: migrating ======================================== 
rake aborted! 
An error has occurred, this and all later migrations canceled: 

RuntimeError: Failed to execute statement due to: [IBM][CLI Driver][DB2/LINUXX8664] SQL0104N An unexpected token "LIMIT" was found following "". Expected tokens may include: "FETCH FIRST <n> ROWS ONLY". SQLSTATE=42601 SQLCODE=-104: SELECT projects.* FROM projects WHERE projects.id < 17 LIMIT 1 

我該如何解決這個問題？

Answer 1

由於bhamby建議，DB2默認情況下不支持LIMIT x關鍵字... 。

但通過DB2_COMPATIBILITY_VECTOR registry variable與DB2 v9.7.2，support for LIMIT x can be enabled開始：

db2set DB2_COMPATIBILITY_VECTOR=MYS 
db2stop 
db2start 

...和它的作品！

Answer 2

DB2不支持LIMIT x關鍵字。

如錯誤消息所述，正確的方法是使用FETCH FIRST x ROWS ONLY來代替。