SpringBoot-15-之整合MyBatis-注解篇+分页

0.相关配置

pom.xml

<!--mysql依赖-->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>
        
<!--mybatis依赖-->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.2</version>
</dependency>

<!-- 为简化set,get,toString代码引入lombok -->
<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.2</version>
    <scope>provided</scope>
</dependency>

application.yml

spring:
    datasource:
      url: jdbc:mysql://localhost:3306/zoom?useSSL=true&useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
      username: root
      password: root
      driver-class-name: com.mysql.jdbc.Driver

使用的表

sword.png

---

1.剑的实体类:com.toly1994.toly_mybatis.entity.Sword

/**
 * 作者：张风捷特烈
 * 时间：2018/8/17 0017:8:23
 * 邮箱：[email protected]
 * 说明：剑的实体类
 */
@Data//=@Getter +@Setter
public class Sword {
    private Integer id;
    private String name;
    private Integer atk;
    private Integer hit;
    private Integer crit;
    private Integer attr_id;
    private Integer type_id;
}

2.剑的数据映射类:com.toly1994.toly_mybatis.mapper.SwordMapper

/**
 * 作者：张风捷特烈
 * 时间：2018/8/17 0017:8:41
 * 邮箱：[email protected]
 * 说明：剑的数据映射类
 */
public interface SwordMapper {
    /**
     * 查询
     *
     * @param name
     * @return
     */
    @Select("SELECT*FROM sword WHERE NAME=#{name}")
    Sword findByName(@Param("name") String name);

    /**
     * 添加
     *
     * @param name
     * @param atk
     * @param hit
     * @param crit
     * @param attr_id
     * @param type_id
     * @return
     */
    @Select("INSERT sword VALUES(DEFAULT,#{name},#{atk},#{hit},#{crit},#{attr_id},#{type_id})")
    void insert(@Param("name") String name,
                @Param("atk") Integer atk,
                @Param("hit") Integer hit,
                @Param("crit") Integer crit,
                @Param("attr_id") Integer attr_id,
                @Param("type_id") Integer type_id
    );
}

3.服务层:com.toly1994.toly_mybatis.service.SwordService

/**
 * 作者：张风捷特烈
 * 时间：2018/8/17 0017:8:48
 * 邮箱：[email protected]
 * 说明：服务层
 */
@Service//坑点1别忘加Service注解
public class SwordService {

    @Autowired
    private SwordMapper mSwordMapper;


    public void insertSword(String name, Integer atk,
                            Integer hit,
                            Integer crit,
                            Integer attr_id,
                            Integer type_id) {
        mSwordMapper.insert(name, atk, hit, crit, attr_id, type_id);
    }

    public Sword findByName(String name) {
        return mSwordMapper.findByName(name);
    }
}

4.剑的控制层:com.toly1994.toly_mybatis.controller.SwordController

/**
 * 作者：张风捷特烈
 * 时间：2018/8/17 0017:8:55
 * 邮箱：[email protected]
 * 说明：剑的控制层
 */
@RestController
public class SwordController {

    @Autowired
    private SwordService mSwordService;

    @GetMapping("/insert")
    public String insertSword(String name, Integer atk,
                              Integer hit,
                              Integer crit,
                              Integer attr_id,
                              Integer type_id) {

        mSwordService.insertSword(name, atk, hit, crit, attr_id, type_id);

        return "OK";
    }

    @GetMapping("/findByName")
    public Sword findByName(String name) {
        return mSwordService.findByName(name);
    }
}

5.启动类：com.toly1994.toly_mybatis.TolyMybatisApplication

@SpringBootApplication
//坑点2，别忘了扫包
@MapperScan(basePackages = {"com.toly1994.toly_mybatis.mapper"})
public class TolyMybatisApplication {

    public static void main(String[] args) {
        SpringApplication.run(TolyMybatisApplication.class, args);
    }
}

6.结果

插入接口：
http://localhost:8080/insert?name=赤凰&atk=3000&hit=100&crit=5&attr_id=1&type_id=2
查询接口：
http://localhost:8080/findByName?name=赤凰

mybatis测试.png

---

7.事务

故意造异常：com.toly1994.toly_mybatis.service.SwordService#insertSword

public void insertSword(String name, Integer atk,
                        Integer hit,
                        Integer crit,
                        Integer attr_id,
                        Integer type_id) {
    mSwordMapper.insert(name, atk, hit, crit, attr_id, type_id);
    int i = 1 / atk;//异常处
}

http://localhost:8080/insert?name=赤凰&atk=0&hit=100&crit=5&attr_id=1&type_id=2

no_transactional.png

使用事务：com.toly1994.toly_mybatis.service.SwordService#insertSword

@Transactional
public void insertSword(String name, Integer atk,
                        Integer hit,
                        Integer crit,
                        Integer attr_id,
                        Integer type_id) {
    mSwordMapper.insert(name, atk, hit, crit, attr_id, type_id);
    int i = 1 / atk;
}

Transactional.png

---

8.分页

8-1：pom.xml

<!-- 分页插件 -->
<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper-spring-boot-starter</artifactId>
    <version>1.2.5</version>
</dependency>

8-2：application.yml

pagehelper:
  helper-dialect: mysql
  reasonable: true
  support-methods-arguments: true
  params: count==countSql
  page-size-zero: true

8-3：com.toly1994.toly_mybatis.mapper.SwordMapper

    /**
     * 查询所有
     *
     * @return
     */
    @Select("SELECT*FROM sword")
    List<Sword> findALL();

8-4：com.toly1994.toly_mybatis.service.SwordService

    /**
     * 分页查询
     * @param page 当前页数
     * @param pageSize 每页个数
     * @return
     */
    public PageInfo<Sword> findAll(int page,int pageSize) {
        PageHelper.startPage(page, pageSize);//改写语句实现分页查询
        List<Sword> all = mSwordMapper.findALL();
        PageInfo<Sword> info = new PageInfo<>(all);
        return info;
    }

8-5：com.toly1994.toly_mybatis.controller.SwordController

    //http://localhost:8080/findAllByPage?page=1&pageSize=3
    @GetMapping("/findAllByPage")
    public PageInfo<Sword> findAll(int page, int pageSize) {
        return mSwordService.findAll(page, pageSize);
    }

8-6：结果演示：

sword表.png

分页查询.png