zfjdoreen的专栏

错误：You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'not null, add column username varchar not null' at line 1 原...

[color=red]Map map = new HashMap(); Set keys = map.keySet(); Iterator it = keys.iterator(); while(it.hasNext()){ String key = (String)it.next(); if(myField.equals(key)){...