[开发工具]Idea搭建Mybatis环境

在工程下的pop.xml文件中，引入依赖

<dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.5</version>
        </dependency>
    </dependencies>

中间<version>标签里的内容可更改，指的是版本

因为要连接数据库，所以接下来引入mysql的驱动

 <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>

junit单元测试

<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
    <scope>test</scope>
</dependency>

在resources文件里新建文件:mybatis-config.xml

<?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>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <!--数据库连接信息-->
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql:///mybatis?useSSL=false"/><!--连接数据库地址-->
                <property name="username" value="root"/><!--mysql的用户名-->
                <property name="password" value="x5"/><!--mysql的密码-->
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="UserMapper.xml"/><!--指定映射文件的路径-->
    </mappers>
</configuration>

在resources文件里新建文件:UserMapper.xml(不一定非要是User,与实体类对应)

<?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">
<!--namespace名称空间-->
<mapper namespace="test">
    <select id="selectAll" resultType="Pojo.User">
    select * from tb_user
  </select>
</mapper>

实体类的属性与数据库对应

?

?测试类MyBatisDemo.java

import Pojo.User;
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 java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class MyBatisDemo {
    public static void main(String[] args) throws IOException {
//加载核心配置，获取SqlSessionFactory
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        //获取 SqlSession,用它执行sql
        SqlSession sqlSession=sqlSessionFactory.openSession();
        //执行sql语句
        List<User> users=sqlSession.selectList("test.selectAll");
        System.out.println(users);
        //释放资源
        sqlSession.close();
    }
}

运行

官方文档:mybatis – MyBatis 3 | Getting started