整合mybatis-示例

引入依赖

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.example</groupId>
  <artifactId>ssm-mybatis</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>ssm-mybatis</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.6.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.13.2</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.7</version>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.16</version>
    </dependency>
    <dependency>
      <groupId>org.junit.jupiter</groupId>
      <artifactId>junit-jupiter</artifactId>
      <version>RELEASE</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>
</project>

jdbc.properties

jdbc.driverClassName=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/yeb?serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=root

mybatis核心配置文件：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>
    <!--引入properties文件，此后就可以在当前文件中使用${key}的方式访问value-->
    <properties resource="jdbc.properties"></properties>

    <!--
    typeAliases：设置类型别名，即为某个具体的类型设置一个别名，
    在mybatis的范围中，就可以使用别名表示一个具体的类型。
    -->
    <typeAliases>
        <!--不使用alias属性设置别名，默认为类名，不区分大小写。User或user-->
        <!-- <typeAlias type="org.example.entity.User" alias="user"></typeAlias>-->

        <!--通过包设置类型别名，指定包下所有的类型将全部拥有默认的别名，即类名，不区分大小写-->
        <package name="org.example.entity"/>
    </typeAliases>

    <!-- environments数据库环境配置 -->
    <!-- 和Spring整合后environments配置将被废除 -->
    <environments default="development">
        <environment id="development">
            <!-- 使用JDBC事务管理 -->
            <transactionManager type="JDBC"/>
            <!-- 数据库连接池 -->
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driverClassName}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>

    <!-- 加载映射文件 -->
    <mappers>
        <!--<mapper resource="mappers/UserMapper.xml"></mapper>-->

        <!--
            以包的方式引入映射文件，但是必须满足下面2个条件：
            1.mapper接口和映射文件所在的包必须一致
            2.mapper接口的名字和映射文件的名字一致
        -->
        <package name="org.example.mapper"/>
    </mappers>
</configuration>

创建mapper映射文件UserMapper.xml

<?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="org.example.mapper.UserMapper">

    <insert id="addUser">
        insert into t_user values (null,'tom',20,'男','123123@qq.com');
    </insert>

</mapper>

测试代码

package org.example;

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.example.mapper.UserMapper;
import org.junit.jupiter.api.Test;

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

public class TestCase {

    @Test
    public void testAddUser() throws IOException {
        //获取核心配置文件的输入流
        InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
        //获取SqlSessionFactoryBuilder对象
        SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
        //获取SqlSessionFactory对象
        SqlSessionFactory build = sqlSessionFactoryBuilder.build(is);
        //获取sql的会话对象sqlSession，是mybatis提供的操作数据库的对象
        SqlSession sqlSession = build.openSession(true);//设为true表示自动提交事务
        //获取UserMapper的代理实现类对象
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        mapper.addUser();

        sqlSession.close();
    }
}

执行成功