spring boot系列(三)整合MyBatis框架

添加依赖

<!--添加mysql 和 mybatis 依赖-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>

配置MyBatis

@Configuration
@MapperScan("com.example.springbootstartlearn.Dao")
public class MyBatisConfig {

    @Autowired
    private DataSource dataSource;

    @Bean
    public SqlSessionFactory sqlSessionFactory() throws Exception {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(dataSource);
        // 扫描moudel
        factoryBean.setTypeAliasesPackage("com.example.springbootstartlearn.Moudel");
        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        factoryBean.setMapperLocations(resolver.getResources("classpath*:**/sqlmap/*.xml"));

        return  factoryBean.getObject();
    }
}

---

配置数据源

这此不再使用properties配置文件了，而是使用yml配置文件，配置如下

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://192.168.1.8:3306/studenms?useUnicode=true&zeroDateTimeBehavior=CONVERT_TO_NULL&autoReconnect=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
    username: root
    password: sa

---

编写dao

model定义这里就不再写了，就是一个java类，按照数据库的字段进行定义，然实现getter/setter方法和构造方法即可

@Repository("userDao")
public interface UserDao {

    public List<UserMoudel> findAll();

    public UserMoudel findById(int id);


    public boolean update(UserMoudel moudel);
}

---

配置sqlmapper.xml

<mapper namespace="com.example.springbootstartlearn.Dao.UserDao">
    <!-- sql映射 -->

    <select id="findAll" resultType="com.example.springbootstartlearn.Moudel.UserMoudel" >
        select * from t_user
    </select>

    <select id="findById" resultType="com.example.springbootstartlearn.Moudel.UserMoudel">
        select * from t_user where id=#{id}
    </select>

    <update id="update" parameterType="com.example.springbootstartlearn.Dao.UserDao">
        update t_user
        <trim prefix="set" suffixOverrides=",">
            <if test="user != null">user=#{user},</if>
            <if test="role != null">role=#{role},</if>
            <if test="name != null">name=#{name},</if>
            <if test="email != null">email=#{email},</if>
            <if test="password != null">password=#{password}</if>
        </trim>
        where id=#{id}
    </update>
</mapper>

---

编写service以及serviceImpl

service

public interface IUserSvc {

    public List<UserMoudel> findAll();

    public UserMoudel findById(int id);


    public boolean update(UserMoudel moudel);
}

serviceImpl

@Service("userSvc")
public class UserSvcImpl implements IUserSvc {

    @Autowired
    private UserDao dao;

    @Override
    public List<UserMoudel> findAll() {
      return dao.findAll();
    }

    @Override
    public UserMoudel findById(int id) {
       return  dao.findById(id);
    }

    @Override
    public boolean update(UserMoudel moudel) {
        return  dao.update(moudel);
    }
}

---

编写Controller并集成swagger

@Api("用户信息服务接口")
@RestController
@RequestMapping(value = "user")
public class UserController {

    @Autowired
    private UserSvcImpl userSvc;

    @ApiOperation("获取全部用户信息")
    @GetMapping(value = "/findAll")
    @ResponseBody
    public List<UserMoudel> findAll() {
        return userSvc.findAll();
    }

    @ApiOperation(value = "根据用户Id查询用户信息")
    @GetMapping(value = "/findById")
    @ResponseBody
    public UserMoudel findById(@RequestParam(value = "用户Id",required = true) int id){
        return userSvc.findById(id);
    }

    @ApiOperation("更新用户信息")
    @PutMapping("/update")
    @ResponseBody
    public boolean update(@RequestBody UserMoudel moudel){
        return userSvc.update(moudel);
    }
}

swagger接口列表如下

每个接口的测试结果如下：

findAll接口

findById接口：

update接口

数据库更新前：

执行接口后

---

遇到的问题

1. 初始化数据源失败，异常信息如下：
   

一般是数据源连接信息错误，或是驱动版本与数据库版本不一致所致