意外令牌“LIMIT”

Question

我的Rails应用程序连接到远程DB2数据库，并迁移时，我跌进这个错误：

== 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 

我该如何解决这个问题？

Answer 1

由于bhamby建议，DB2默认情况下不支持LIMIT x关键字... 。

但通过DB2_COMPATIBILITY_VECTOR registry variable与DB2 v9.7.2，support for LIMIT x can be enabled开始：

db2set DB2_COMPATIBILITY_VECTOR=MYS 
db2stop 
db2start 

...和它的作品！

Answer 2

DB2不支持LIMIT x关键字。

如错误消息所述，正确的方法是使用FETCH FIRST x ROWS ONLY来代替。