SpringBoot入门 - MyBatis集成实现简单的增删改查

1.新建maven项目：

2.导入依赖：

<!-- web支持: 1、web mvc; 2、restful; 3、jackjson支持; 4、aop ... -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<!-- servlet依赖 -->
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <scope>provided</scope>
</dependency>

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jstl</artifactId>
</dependency>

<!-- tomcat 的支持. -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-jasper</artifactId>
    <scope>provided</scope>
</dependency>

<!-- FreeeMarker模板引擎所需依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>

<!-- springboot测试 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
</dependency>

<!-- mysql数据库驱动 -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- jdbc依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

<!-- spring-boot mybatis依赖：注意：不要使用1.0.0版本，因为还不支持拦截器插件，我这里 1.1.1 目前可用 -->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.1.1</version>
</dependency>

<!-- 分页插件 -->
<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper</artifactId>
    <version>4.1.0</version>
</dependency>

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

温馨小提示：由于我这里是新建的module，因此我的springboot依赖放在了外面导入，你们根据自己的项目来就好

<!-- dependencyManagement-解决单继承问题 -->
<dependencyManagement>
    <dependencies>
        <!--springboot版本管理--><!-- SpringBoot所需依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>2.0.5.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

3.mysql连接配置

4.MyBatis相关配置 -- 这里是PageHelper分页插件

@Configuration //相当于我们建了applicationContext-xxx.xml <beans></beans>
public class MyBatisConfiguration {
    @Bean
    public PageHelper pageHelper() {
        System.out.println("MyBatisConfiguration.pageHelper()");
        PageHelper pageHelper = new PageHelper();
        Properties p = new Properties();
        p.setProperty("offsetAsPageNum", "true");
        p.setProperty("rowBoundsWithCount", "true");
        p.setProperty("reasonable", "true");
        pageHelper.setProperties(p);
        return pageHelper;
    }
}

5.编写启动类

@SpringBootApplication
//@MapperScan("com.zhengqing.springboot.*.mapper") //FIXME : * 用在多模块项目
@MapperScan("com.zhengqing.springboot.mapper")  //@MapperScan:扫描该包下的接口
public class WebApplication {
    public static void main(String[] args) {
        SpringApplication.run(WebApplication.class);
    }
}

6.编写代码 domain实体类，query层，service层这些根据自己的业务来，就不多说了，

主要说说mapper映射分xml版和注解版 如下

public interface UserMapper {
    void save(User user); //TODO xml版
    List<User> queryPage(UserQuery query);

    // FIXME 注解版  【注意：如果使用这个  就不写beanMapper.xml相关代码!!】
  /*  @Insert("insert into t_user(name) values(#{name})")
    @Options(useGeneratedKeys = true,keyProperty = "id",keyColumn = "id")
    void save(User user);*/
}

beanMapper.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="com.zhengqing.springboot.mapper.UserMapper">
    <!-- useGeneratedKeys:true标识返回主键 -->
    <insert id="save" parameterType="User" useGeneratedKeys="true" keyProperty="id" keyColumn="id">
        insert into t_user(name) values(#{name})
    </insert>

    <select id="queryPage" resultType="User"  parameterType="UserQuery">
        select  * from t_user
    </select>
</mapper>

温馨小提示： 写beanMapper.xml的时候注意分层结构要对应不然最后接口和映射文件编译不到同一个路径下

最后就可以来个简单的测试了~

@RunWith(SpringRunner.class)
//标识这是一个spring测试，指定入口【从哪儿加载spring配置文件】和应用类型,它就会扫描入口类子子孙孙包的bean
@SpringBootTest(classes = WebApplication.class)
public class IUserServiceTest {

    @Autowired
    private IUserService userService;
 
    @Test  //MyBatis的crud ...
    public void test01() throws Exception{
        User user = new User("测试数据-是否可以返回主键");
        System.out.println(user);
        userService.save(user);
        System.out.println(user);
    }

    @Test //分页
    public void test02() throws Exception{
        //com.github.pagehelper.Page --->PageList(currentPage,pageSizs,totalRecords,totalpages,Data)
        Page<User> list = (Page) userService.queryPage(new UserQuery());
        System.out.println(list.getClass());
        System.out.println("总数据条数:"+list.getTotal());
        System.out.println("总页数:"+list.getPages());
        System.out.println("当前页:"+list.getPageNum());
        System.out.println("每一页数据条数:"+list.getPageSize());
        for (User user : list) {
            System.out.println(user);
        }
    }

}

最后附上源码：https://pan.baidu.com/s/1ZrdrzhEXE0wiE_5nTOUDfg

SpringBoot入门 - MyBatis集成实现简单的增删改查

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