IDEA 创建一个Mybatis Maven项目的方法步骤(图文)

<dependencies>
  <dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis</artifactId>
   <version>3.3.0</version>
  </dependency>
  <!-- mysql驱动包 
  	这个驱动包要根据自己MySQL版本来配置不然就会出bug-->
  <dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>8.0.11</version>
  </dependency>
  <!-- junit测试包 -->
  <dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>4.11</version>
   <scope>test</scope>
  </dependency>
 </dependencies>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
 <!-- 环境配置 -->
 <environments default="mysql">
  <!--配置mysql的环境-->
  <environment id="mysql">
   <!--配置事务的类型-->
   <transactionManager type="JDBC"></transactionManager>
   <!--配置连接池-->
   <dataSource type="POOLED">
    <property name="driver" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost:3306/testuser?serverTimezone=Asia/Shanghai" />
    <property name="username" value="root" />
    <property name="password" value="li4918458" />
   </dataSource>
  </environment>
 </environments>
 <!-- mapping文件路径配置 -->
 <mappers>
  <mapper resource="mapper/UserMapper.xml"/>
 </mappers>

</configuration>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
  PUBLIC "-//mybatis.org//DTD mapper 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="pojo.User">
 <!--id ="接口中的方法名"
 　　parameterType="传入的参数类型"
 　　resultType = "返回实体类对象，使用包.类名"-->

 <select id="findById" parameterType="int" resultType="pojo.User"> select * from user where id = #{id}

 </select> 
 </mapper>

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import pojo.User;

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;

public class test {
@Test
public void testSearchById() throws IOException {
 //1.读取配置文件
 InputStream in = Resources.getResourceAsStream("mybatis-config.xml");
 //2.创建SqlSessionFactory工厂
 SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
 //3.使用工厂生产SqlSession对象
 SqlSession session = sqlSessionFactory.openSession();
 //4.执行Sql语句
 User user = session.selectOne("test.findUserById", 1);
 //5. 打印结果
 System.out.println(user);
 //6.释放资源
 session.close();
 in.close();
}

 //根据用户名模糊查询用户列表
 @Test
 public void testFindUserByUsername() throws IOException {
  //定义读取文件名
  String resources = "mybatis-config.xml";
  //创建流
  Reader reader=null;
  try {
   //读取mybatis-config.xml文件到reader对象中
   reader= Resources.getResourceAsReader(resources);
  } catch (IOException e) {
   e.printStackTrace();
  }
  //初始化mybatis,创建SqlSessionFactory类的实例
  SqlSessionFactory sqlMapper=new SqlSessionFactoryBuilder().build(reader);
  //创建session实例
  SqlSession session=sqlMapper.openSession();
  //传入参数查询，返回结果
  User user=session.selectOne("findById",1);
  //输出结果
  System.out.println(user.getName());
  //关闭session
  session.close();
 }
}