如何检查用户名已经存在
我是这样做的,不知道有没有简洁的方法

Java code

public boolean isExists(String userName) {        boolean ie = false;        int result = 0;        sql = "select count(*) as result from t_user where [user_name] = ?";        try {            super.openConn();            pstmt = conn.prepareStatement(sql);            pstmt.setString(1, userName);            rs = pstmt.executeQuery();            if(rs.next()){                result = rs.getInt("result");            }            if(result > 0){                ie = true;            }        } catch (Exception e) {            e.printStackTrace();        }finally{            super.closeAll();        }        return ie;    }

[解决办法]
直接select * from t_user where [user_name] = ?啊，就不必用两个if判断语句了
直接一个if判断就行了：
if(rs.next()){
ie = true;
}