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Mybatis-H2-Junit

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本文字数： 6.3k 阅读时长 ≈ 6 分钟

接着上章内容mybatis源码环境搭建,根据官方文档，运行一个demo项目。

项目结构

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mybatis-learning/mybatis-learning-01
├── mybatis-learning-01.iml
├── pom.xml  #项目依赖管理 1
└── src
    ├── main
    │   ├── java
    │   │   ├── cn
    │   │   │   └── z201
    │   │   │       └── mybatis
    │   │   │           └── learning
    │   │   │               ├── SetUpSessionFactory.java # mybatis 初始化  3
    │   │   │               ├── User.java # 实体 5
    │   │   │               └── UserDao.java # 实体dao 6
    │   │   └── package-info.java
    │   └── resources
    │       ├── init_table.sql # h2数据库初始化sql 4
    │       ├── mybatis
    │       │   └── UserDao.xml # dao 对应的mapper 7
    │       └── mybatis-config.xml # mybatis 配置文件 2
    └── test
        └── java
            └── cn
                └── z201
                    └── mybatis
                        └── test
                            ├── MybatisTest01.java # 单元测试 8
                            └── package-info.java

15 directories, 11 files

根据上面注释的顺序，我们依次介绍项目代码。

0x01 项目依赖管理

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<?xml version="1.0" encoding="UTF-8"?>
<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>cn.z201</groupId>
    <artifactId>mybatis-learning-01</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>8</source>
                    <target>8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>


    <properties>
        <mybatis.version>3.5.0</mybatis.version>
        <junit.version>4.12</junit.version>
        <lmbok.version>1.18.4</lmbok.version>
        <mysql.version>5.1.47</mysql.version>
        <h2.version>1.4.197</h2.version>
        <!-- pom文件需要指定打包编码集，[WARNING] File encoding has not been set, using platform encoding GBK, i.e. build is platform dependent!  -->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${mybatis.version}</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lmbok.version}</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <version>${h2.version}</version>
            <scope>test</scope>
        </dependency>
		
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>${junit.version}</version>
            <scope>test</scope>
        </dependency>
    </dependencies>


</project>

0x02 mybatis 配置文件

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<?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">
                <property name="driver" value="org.h2.Driver"/>
                <property name="url" value="jdbc:h2:mem:mybatis_learning_01_db;MODE=MYSQL;INIT=RUNSCRIPT FROM './src/main/resources/init_table.sql'"/>
                <property name="username" value="root"/>
                <property name="password" value=""/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="mybatis/UserDao.xml"/>
    </mappers>
</configuration>

0x03 mybatis 初始化

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package cn.z201.mybatis.learning;

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;

public class SetUpSessionFactory {

    public SqlSession initSessionFactory() throws IOException {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        return sqlSessionFactory.openSession();
    }

}

0x04 h2数据库初始化sql

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CREATE TABLE `user`(
  id SMALLINT PRIMARY KEY AUTO_INCREMENT ,
  name VARCHAR(50),
  age SMALLINT,
  gender SMALLINT
);

INSERT INTO `user`(name , age , gender) VALUES('TOM' , 12 , 0 );
INSERT INTO `user`(name , age , gender) VALUES('JON' , 13 , 1 );
INSERT INTO `user`(name , age , gender) VALUES('King' , 11 , 0 );

0x05 实体bean

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package cn.z201.mybatis.learning;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.ToString;

@Data
@AllArgsConstructor
@ToString
public class User {

    private Integer id;
    private String name;
    private Integer age;
    private Integer gender;

}

0x06 实体dao

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package cn.z201.mybatis.learning;

import java.util.List;

public interface UserDao {

    List<User> list();

}

0x07 实体dao对应的mapper.xml

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<?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="cn.z201.mybatis.learning.UserDao">

    <select id="list" resultType="cn.z201.mybatis.learning.User">
      SELECT * FROM `user`
    </select>

</mapper>

0x08 单元测试

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package cn.z201.mybatis.test;

import cn.z201.mybatis.learning.SetUpSessionFactory;
import cn.z201.mybatis.learning.User;
import cn.z201.mybatis.learning.UserDao;
import org.apache.ibatis.session.SqlSession;
import org.junit.Assert;
import org.junit.Test;

import java.io.IOException;
import java.util.List;

public class MybatisTest01 {

    @Test
    public void test01() throws IOException {
        SetUpSessionFactory setUpSessionFactory = new SetUpSessionFactory();
        SqlSession sqlSession = setUpSessionFactory.initSessionFactory();
        UserDao userDao = sqlSession.getMapper(UserDao.class);
        List<User> userList = userDao.list();
        sqlSession.close();
        Assert.assertNotNull(userList);
        userList.forEach(System.out::println);
    }

}
  • 结果
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User(id=1, name=TOM, age=12, gender=0)
User(id=2, name=JON, age=13, gender=1)
User(id=3, name=King, age=11, gender=0)