No operations allowed after statement closed.错误-求助

[italucia]

请问一般No operations allowed after statement closed.是什么错误？
报错如下：
java.sql.SQLException: No operations allowed after statement closed.
at com.mysql.jdbc.Statement.checkClosed(Statement.java:277)
at com.mysql.jdbc.Statement.executeQuery(Statement.java:870)
at Display.main(Display.java:92)
源程序
sql="select * From Student";

//read result

try {
ResultSet rs=stmt.executeQuery(sql);
while(rs.next())
{


String AgentName=rs.getString(1);

System.out.println(AgentName+" ");
}

rs.close();
stmt.close();

}
catch (Exception e){
System.out.println("exceptin in excute the query!");
e.printStackTrace();}



是控制流的错误么？
PS. 关于SQL语句肯定没错。。。

[italucia]

问题解决了，就是控制流上有问题，stmt.close()后又循环回去，但没有重新get statement object,把控制流上移下就好了:)

[懒得去死]

http://raibledesigns.com/rd/entry/mysql_problem_no_operations_allowed