Spring Boot 系列教程3-MyBatis

MyBatis

MyBatis 本是apache的一个开源项目iBatis, 2010年这个项目由apache 迁移到了google code，并且改名为MyBatis 。2013年11月迁移到Github。

集成spring boot 的时候必须在mapper接口上面标注@Mapper注解

项目图片

pom.xml

-只需要在pom.xml引入需要的数据库配置，就会自动访问此数据库，如果需要配置其他数据库，可以在application.properties进行添加

-默认使用org.apache.tomcat.jdbc.pool.DataSource创建连接池

<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>com.jege.spring.boot</groupId>

    <artifactId>spring-boot-mybatis</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>jar</packaging>

    <name>spring-boot-mybatis</name>

    <url>http://maven.apache.org</url>

    <!-- 公共spring-boot配置，下面依赖jar文件不用在写版本号 -->

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.4.1.RELEASE</version>

        <relativePath />

    </parent>

    <properties>

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

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <!-- 持久层 -->

        <dependency>

            <groupId>org.mybatis.spring.boot</groupId>

            <artifactId>mybatis-spring-boot-starter</artifactId>

            <version>1.1.1</version>

        </dependency>

        <!-- h2内存数据库 -->

        <dependency>

            <groupId>com.h2database</groupId>

            <artifactId>h2</artifactId>

            <scope>runtime</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <build>

        <finalName>spring-boot-mybatis</finalName>

        <plugins>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <configuration>

                    <source>${java.version}</source>

                    <target>${java.version}</target>

                </configuration>

            </plugin>

        </plugins>

    </build>

</project>

User.java

package com.jege.spring.boot.mybatis.entity;

/**

 * @author JE哥

 * @email 1272434821@qq.com

 * @description:模型对象

 */

public class User {

  private Long id;

  private String name;

  private Integer age;

  public User() {

  }

  public User(String name, Integer age) {

    this.name = name;

    this.age = age;

  }

  public Long getId() {

    return id;

  }

  public void setId(Long id) {

    this.id = id;

  }

  public String getName() {

    return name;

  }

  public void setName(String name) {

    this.name = name;

  }

  public Integer getAge() {

    return age;

  }

  public void setAge(Integer age) {

    this.age = age;

  }

}

UserMapper.java

package com.jege.spring.boot.mybatis.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Delete;

import org.apache.ibatis.annotations.Insert;

import org.apache.ibatis.annotations.Mapper;

import org.apache.ibatis.annotations.Select;

import com.jege.spring.boot.mybatis.entity.User;

/**

 * @author JE哥

 * @email 1272434821@qq.com

 * @description:持久层接口，由spring自动生成其实现

 */

@Mapper

public interface UserMapper {

  @Delete("drop table t_user if exists")

  void dropTable();

  @Insert("create table t_user (id bigint generated by default as identity, age integer, name varchar(255), primary key (id))")

  void createTable();

  @Insert("insert into t_user(name,age) values(#{name},#{age})")

  void insert(User user);

  @Select("select id,name,age from t_user")

  List<User> findAll();

  @Select("select id,name,age from t_user where name like #{name}")

  List<User> findByNameLike(String name);

  @Delete("delete from t_user")

  void deleteAll();

}

Application.java

package com.jege.spring.boot;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

/**

 * @author JE哥

 * @email 1272434821@qq.com

 * @description:spring boot 启动类

 */

@SpringBootApplication

public class Application {

  public static void main(String[] args) {

    SpringApplication.run(Application.class, args);

  }

}

不需要application.properties

UserMapperTest.java

package com.jege.spring.boot.mybatis;

import static org.assertj.core.api.Assertions.assertThat;

import org.junit.After;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.boot.test.context.SpringBootTest;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.jege.spring.boot.mybatis.entity.User;

import com.jege.spring.boot.mybatis.mapper.UserMapper;

/**

 * @author JE哥

 * @email 1272434821@qq.com

 * @description:

 */

@RunWith(SpringJUnit4ClassRunner.class)

@SpringBootTest()

public class UserMapperTest {

  @Autowired

  UserMapper userMapper;

  // 每次执行Test之前先删除表，创建表

  @Before

  public void before() throws Exception {

    userMapper.dropTable();

    userMapper.createTable();

  }

  // 打印出class com.sun.proxy.$Proxy66表示spring注入通过jdk动态代理获取接口的子类

  @Test

  public void proxy() throws Exception {

    System.out.println(userMapper.getClass());

  }

  @Test

  public void save() throws Exception {

    for (int i = 0; i < 10; i++) {

      User user = new User("jege" + i, 25 + i);

      userMapper.insert(user);

    }

  }

  @Test

  public void all() throws Exception {

    save();

    assertThat(userMapper.findAll()).hasSize(10);

  }

  @Test

  public void findByName() throws Exception {

    save();

    assertThat(userMapper.findByNameLike("jege%")).hasSize(10);

  }

  // 每次执行Test之后清空数据

  @After

  public void destroy() throws Exception {

    userMapper.deleteAll();

  }

}

源码地址

https://github.com/je-ge/spring-boot

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