jFinal 数据库出错? 400 报错

jFinal 数据库出错? 400 报错

jFinal 2.2 oracle 11，这几天被这个问题搞死了。。。

String str="update ? SET ? = ? where ? = ?";
Db.find(str,db,field,value,id_name,id);

Sql: update ? SET ? = ? where ? = ?

2016-05-17 08:13:17
[ERROR]-[Thread: http-nio-8080-exec-192]-[com.jfinal.core.ActionHandler.handle()]: /save
com.jfinal.plugin.activerecord.ActiveRecordException: java.sql.SQLSyntaxErrorException: ORA-00903: 表名无效

17-May-2016 08:13:17.031 INFO [http-nio-8080-exec-197] org.apache.catalina.core.StandardContext.reload Reloading Context with name [/interest] is completed
	at com.jfinal.plugin.activerecord.DbPro.find(DbPro.java:315)
	at com.jfinal.plugin.activerecord.Db.find(Db.java:225)
	at com.interest.controller.IndexController.save(IndexController.java:60)

String str="update formula set gs='....' where fid=1";
Db.find(str);

[ERROR]-[Thread: http-nio-8080-exec-185]-[com.jfinal.core.ActionHandler.handle()]: /save
com.jfinal.plugin.activerecord.ActiveRecordException: java.sql.SQLSyntaxErrorException: ORA-00900: 无效SQL语句

	at com.jfinal.plugin.activerecord.DbPro.find(DbPro.java:315)
	at com.jfinal.plugin.activerecord.DbPro.find(DbPro.java:326)
	at com.jfinal.plugin.activerecord.Db.find(Db.java:233)
	at com.interest.controller.IndexController.save(IndexController.java:60)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)