【數據庫】【JDBC】獲得MySQL數據庫自動生成的主鍵

create table test1
(
  id int primary key auto_increment,
  name varchar(20)
);

package jdbc;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class Test {
    public static void main(String[] args) {
        Connection conn = null;
        PreparedStatement st = null;
        ResultSet rs = null;
        try{
            conn = JdbcUtils.getConnection();
            String sql = "insert into test1(name) values(?)";
            st = conn.prepareStatement(sql);
            st.setString(1, "ccc"); //在設計表的時候 已經設置主鍵自動增長 
            st.executeUpdate();
            //獲取數據庫自動生成的主鍵
            rs = st.getGeneratedKeys();
            if(rs.next()){
                System.out.println(rs.getInt(1));
            }
        }catch (Exception e) {
            e.printStackTrace();
        }finally{
            JdbcUtils.release(conn, st, rs);
        }
    }
}