jsp制作的网页 电器登陆后  出现下列异常：
java.sql.SQLException: Unknown column 'user_id' in 'field list'
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2928)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1571)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1666)
    at com.mysql.jdbc.Connection.execSQL(Connection.java:2994)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:936)
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1030)
    at com.zzz.util.DbUtil.Logincheck(DbUtil.java:44)
    at com.zzz.servlet.LoginServlet.doGet(LoginServlet.java:34)

    at com.zzz.servlet.LoginServlet.doPost(LoginServlet.java:55)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

MySQL  数据库里  表名字段名都对   请教大神应该怎么调