Exception in thread "main" java.

好久不写简书了，今天遇到一个挺奇怪的问题，如下：

ResultSet rs = stmt.executeQuery("select * from xxx");

ResultSet rs2 = stmt.executeQuery("select * from xxx");

int countWb =0;

while (rs.next()) {

countWb = rs.getRow();

}

while(rs2.next()){

tradeDate=rs2.getString("xxx");

}

执行到while(rs2.next()){ 的时候就报Exception in thread "main" java.sql.SQLException: Statement has already closed.

中间没有关闭Statement ，

尝试修改代码顺序如下：

ResultSet rs = stmt.executeQuery("select * from xxx");

int countWb =0;

while (rs.next()) {

countWb = rs.getRow();

}

ResultSet rs2 = stmt.executeQuery("select * from xxx");

while(rs2.next()){

tradeDate=rs2.getString("xxx");

}

跑通成功，同一个stmt，执行完一次查询后，会关掉查询的入口，rs2.next()就会报错，所以rs2.next()运行之前在打开一次查询入口，即执行ResultSet rs2 = stmt.executeQuery("select * from xxx");

就可以了。