代码：
Db.update("delete from T_Xabc where ID= ‘?‘","9900"); 现象：
com.jfinal.plugin.activerecord.ActiveRecordException: java.sql.SQLException: 无效的列索引 at com.jfinal.plugin.activerecord.DbPro.update(DbPro.java:279) at com.jfinal.plugin.activerecord.Db.update(Db.java:206)正确代码：
Db.update("delete from T_Zabc where ID = ? ","9900");
JFinal ActiveRecordException: 无效的列索引
原文：http://my.oschina.net/cnyang/blog/417417