在實際的開發的當中
我們會發現在資料庫中插入資料是比查詢資料難的
因為查詢只需要一個固定的值就可以進行查詢
但是插入的話需要對照資料庫的建表

因為有些鍵值不允許為空

示例程式碼：

package sqlserver.controller;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import peopele.User;

public class Sqlserver_People_Controller extends Sqlserver_Controller{


    public Sqlserver_People_Controller(){
        super();
 

    }

    public void user_register(User user){

        try {
            String sql = "insert into dbo.Table_User(userid, username, email, mobilephone, password)"
                    + "values(?, ?, ?, ?, ?)";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString
 
(1, user.getId());
            ps.setString(2, user.getName());
            ps.setString(3, user.getEmail());
            ps.setString(4, user.getMobilephone());
            ps.setString(5, user.getPassword());
            int row = ps.executeUpdate();
            if(row > 0){
                System.out
 
.println("使用者" + user.getName() + "已向dbo.Table_User表中添加了"
                        + row + "條資料");
            }

            ps.close();
            user = null;
            connection.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("向dbo.Table_User中新增使用者"
                    + user.getName() + "的資訊失敗");
        } 
    }


    public User user_login(String username){

            try {
                Statement stmt = connection.createStatement();

                String sql = "select * from dbo.Table_User where username = '" + username + "'";
                ResultSet rs = stmt.executeQuery(sql);
                System.out.println("正在查詢使用者" + username + "的資訊");

                rs.next();
                System.out.println("已查詢到使用者" + username + "的資訊");
                User user = new User(
                        rs.getString("userid"),
                        rs.getString("username"),
                        rs.getString("email"),
                        rs.getString("mobilephone"),
                        rs.getString("password")
                        );

                System.out.println("使用者" + username + "登入成功");

                return user;

            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                System.out.println("使用者" + username + "登入失敗");
            }

            return null;

        }
}