67 lines
2.1 KiB
Java
67 lines
2.1 KiB
Java
package com.inmind;
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import com.inmind.mapper.UserMapper;
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import com.inmind.pojo.User;
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import org.junit.jupiter.api.Test;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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import java.sql.*;
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import java.util.ArrayList;
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import java.util.List;
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@SpringBootTest //该注解的作用，启动spring环境，所以也就有了IOC容器
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class SpringbootMybatisQuickstartApplicationTests {
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@Autowired//直接从IOC容器中获取UserMapper类型的对象
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private UserMapper userMapper;//接口开发，多态
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@Test
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void contextLoads() {
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//使用mybatis框架查询所有用户的数据
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List<User> list = userMapper.list();
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list.stream().forEach(user -> {
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System.out.println(user.getId());
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System.out.println(user);
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});
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}
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@Test
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void testJDBC() throws ClassNotFoundException, SQLException {
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//1. 注册驱动
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Class.forName("com.mysql.cj.jdbc.Driver");
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//2. 获取连接对象
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String url = "jdbc:mysql://localhost:3306/mybatis";
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String username = "root";
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String password = "1234";
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Connection connection = DriverManager.getConnection(url, username, password);
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//3. 获取执行SQL的对象Statement,执行SQL,返回结果
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String sql = "select * from user";
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Statement statement = connection.createStatement();
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ResultSet resultSet = statement.executeQuery(sql);
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//4. 封装结果数据
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List<User> userList = new ArrayList<>();
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while (resultSet.next()){
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int id = resultSet.getInt("id");
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String name = resultSet.getString("name");
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int age = resultSet.getInt("age");
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short gender = resultSet.getShort("gender");
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String phone = resultSet.getString("phone");
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User user = new User(id,name,age,gender,phone);
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userList.add(user);
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}
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//5. 释放资源
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statement.close();
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connection.close();
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userList.forEach(System.out::println);
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}
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}
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