jdbc 6.0

1.获取数据库自动生成的键值

 package com.rong.jielong;

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

 public class Test11 {

     /**
      * 获取数据库自动生成的键值
      *
      * @author 容杰龙
      */
     public static void main(String[] args) {
         try {
             Class.forName("com.mysql.jdbc.Driver");
             String url = "jdbc:mysql://localhost:3306/rjl";
             String user = "rjl";
             String password = "123";
             Connection conn = DriverManager.getConnection(url, user, password);
             // MySQL自动生成的键值可先用null填补位置
             String sql = "insert into user values(null,?,?,?)";

             // 创建一个默认 PreparedStatement 对象，该对象能获取自动生成的键，适合insert语句搜索
             PreparedStatement ps = conn.prepareStatement(sql,
                     Statement.RETURN_GENERATED_KEYS);

             ps.setString(1, "hhh");
             ps.setInt(2, 22);
             ps.setString(3, "www");
             int count = ps.executeUpdate();
             if (count > 0) {
                 // 获取自动生成的键值-----结果集
                 ResultSet rs = ps.getGeneratedKeys();
                 while (rs.next()) {
                     int autoKey = rs.getInt(1);
                     System.out.println(autoKey);
                 }
             } else {
                 System.out.println("获取失败！");
             }
         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         } catch (SQLException e) {
             e.printStackTrace();
         }

     }

 }