204701e99d45001d1cdee86927ab33b7

学生管理信息系统 采用结构化的系统开发方法

<%@page contentType="text/html; charset=gb2312" import="java.sql.*"%>
<%
  String driver = "sun.jdbc.odbc.JdbcOdbcDriver"; //驱动程序，见第十四章
  String url = "jdbc:odbc:stud"; //数据库连接语句，见第十四章
  String userID = "sa", pwd = "", sql = "";
  try {
    Class.forName(driver); //调入JDBC-ODBC桥的驱动程序
    Connection conn = DriverManager.getConnection(url, userID, pwd); //建立与数据的连接
    //request对象见第四章
    request.setCharacterEncoding("gb2312"); //乱码转换成中文
    Statement stmt = conn.createStatement(); //建立Statement的实例，相当于创建一个查询分析器的运行环境
    sql = "select * from studinfo where studid='" + request.getParameter("studID") + "'";
    ResultSet rs = stmt.executeQuery(sql);
    if(rs.next())
    {
%>
<script language="javascript">
alert("学生编号已存在，请选择其它编号");
window.history.go(-1);
</script>
<%
    }
    rs.close();
    sql = "insert studinfo values('" + request.getParameter("studID") + "','";
    sql = sql  + request.getParameter("studName") + "','";
    sql = sql  + request.getParameter("classID") + "','";
    sql = sql  + request.getParameter("sex") + "','";
    sql = sql  + request.getParameter("age") + "')";
    if (stmt.executeUpdate(sql) > 0) {
      response.sendRedirect("StudList.jsp"); //response对象见第四章,连接到memCenter.jsp页面
    }
  } catch (Exception e) {
    System.out.println(e.getMessage());
  }
%>