JDBC的简单使用

表user的数据

 JDBC代码

在不使用ORM框架情况下，直接使用JDBC操作数据库

package com.su.mybatis.mysql.controller;

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

import com.alibaba.fastjson.JSON;
import com.su.mybatis.mysql.model.User;

public class MybatisTest {

    public static void main(String[] args) {
        Connection conn = null;//数据库连接
        PreparedStatement stmt = null;//预编译机制，添加参数的方式能有效防止sql注入
        ResultSet rs = null;//结果集
        try {
            //1、注册驱动
            Class.forName("com.mysql.jdbc.Driver");
            //2、获取连接
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8", "root", "Su123456");

            //3、创建查询
            String sql = "SELECT * FROM user where id = ?";
            stmt = conn.prepareStatement(sql);
            stmt.setInt(1, 1);
            System.out.println(stmt.toString());
            rs = stmt.executeQuery();

            //4、数据转换（查询结果封装曾User对象）
            while (rs.next()) {
                User user = new User();
                user.setId(rs.getInt("id"));
                user.setName(rs.getString("name"));
                user.setAge(rs.getInt("age"));
                user.setPhone(rs.getString("phone"));
                user.setMoney(rs.getInt("money"));
                System.out.println("user:" + JSON.toJSONString(user));
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //5、关闭连接
            if(rs != null){
                try {
                    rs.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            if (stmt != null){
                try {
                    stmt.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if (conn != null){
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

输出结果

com.mysql.jdbc.JDBC4PreparedStatement@afa4b0: SELECT * FROM user where id = 1
user:{"age":27,"id":1,"money":1000,"name":"su","phone":"18912341234"}

 

 

如果有写的不对的地方，请大家多多批评指正，非常感谢！