mysql - 用jsp向MySQL表中插入一行

Question

我想用 jsp 代码向 mysql 数据库中插入行，但我做不到。这是我没有 html 形式的 jsp 代码:

<%
String login = request.getParameter("login");
String password = request.getParameter("password");
String full_name = request.getParameter("full_name");
String ulevel = request.getParameter("ulevel");
String team_id = request.getParameter("team_id");

Connection connection = null;
PreparedStatement pstatement = null;
Class.forName("com.mysql.jdbc.Driver").newInstance();
int updateQuery = 0;
if(login!=null && password!=null && full_name!=null && ulevel!=null && team_id!=null){
if(login!="" && password!="" && full_name!="" && ulevel!="" && team_id!="") {
    try {
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/android","root","root");
String queryString = "INSERT INTO users(user_id,login,password,full_name,ulevel,team_id) VALUES (null, ?, ?, ?, ?, ?)";
pstatement = connection.prepareStatement(queryString);
pstatement.setString(2, login);
pstatement.setString(3, password);
pstatement.setString(4, full_name);
pstatement.setString(5, ulevel);
pstatement.setString(6, team_id);
updateQuery = pstatement.executeUpdate();
if (updateQuery != 0) { %> 

当我按下 SUBMIT 时，网页显示如下:

type Status report message descriptionThe requested resource () is not available.

p.s. 列user_id在mysql表中设置为autoincrement，所以我使用null。

但我不知道，那是正确的方法...

我从 netbeans 7.0.1 运行代码

Answer 1

因为 ID 是自动递增，从列表中删除它，preparedstatement 在其参数上寻找索引 1。

String queryString = "INSERT INTO users(login,password,full_name,ulevel,team_id) VALUES (?, ?, ?, ?, ?)";
pstatement = connection.prepareStatement(queryString);
pstatement.setString(1, login);
pstatement.setString(2, password);
pstatement.setString(3, full_name);
pstatement.setString(4, ulevel);
pstatement.setString(5, team_id);

下面这个没有测试

只需使用 1 开始参数，因为只有 5 个参数需要定义。

String queryString = "INSERT INTO users(user_id,login,password,full_name,ulevel,team_id) VALUES (null, ?, ?, ?, ?, ?)";
pstatement = connection.prepareStatement(queryString);
pstatement.setString(1, login);
pstatement.setString(2, password);
pstatement.setString(3, full_name);
pstatement.setString(4, ulevel);
pstatement.setString(5, team_id);