Spring Boot 2.X(十九)：集成 mybatis-plus 高效开发

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- 热部署模块 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional> <!-- 这个需要为 true 热部署才有效 -->
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.0</version>
        </dependency>
    </dependencies>

# spring setting
spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/db_test?useUnicode=true&characterEncoding=UTF-8&useSSL=false
    username: root
    password: zwqh@0258

@TableName(value="t_user")
public class UserEntity {

    @TableId(value="id",type=IdType.AUTO)
    private Long id;
    private String userName;
    private String userSex;
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getUserSex() {
        return userSex;
    }
    public void setUserSex(String userSex) {
        this.userSex = userSex;
    }

}

public interface UserDao extends BaseMapper<UserEntity>{

}

@SpringBootApplication
@MapperScan("cn.zwqh.springboot.dao")
public class SpringBootMybatisPlusApplication {

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

}

@Configuration
public class MybatisPlusConfig {
     /**
     *   mybatis-plus分页插件
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor page = new PaginationInterceptor();
        page.setDialectType("mysql");
        return page;
    }

}

UserEntity user=new UserEntity();
user.setUserName("朝雾轻寒");
user.setUserSex("男");
userDao.insert(user);

UserEntity user=new UserEntity();
user.setUserName("朝雾轻晓");
user.setUserSex("男");
user.setId(25L);
userDao.updateById(user);

UserEntity user=new UserEntity();
user.setUserSex("女");
userDao.update(user,new QueryWrapper<UserEntity>().eq("user_name", "朝雾轻寒"));

UserEntity user = userDao.selectById(id);

int count = userDao.selectCount(new QueryWrapper<UserEntity>().eq("user_sex", "男"));

QueryWrapper<UserEntity> queryWrapper=new QueryWrapper<UserEntity>();
        UserEntity user=new UserEntity();
        user.setUserName("朝雾轻寒");
        user.setUserSex("男");
        queryWrapper.setEntity(user);
user = userDao.selectOne(queryWrapper);

QueryWrapper<UserEntity> queryWrapper=new QueryWrapper<UserEntity>();
        UserEntity user=new UserEntity();
        user.setUserSex("男");
        queryWrapper.setEntity(user);
List<Object> objs= userDao.selectObjs(queryWrapper);

Map<String, Object> map=new HashMap<String, Object>();
        map.put("user_name", username);
        map.put("user_sex",sex);
List<UserEntity> list = userDao.selectByMap(map);

Map<String, Object> map=new HashMap<String, Object>();
        map.put("user_sex","男");
List<UserEntity> list = userDao.selectList(new QueryWrapper<UserEntity>().allEq(map));

Map<String, Object> map=new HashMap<String, Object>();
        map.put("user_sex","男");
List<Map<String, Object>> list = userDao.selectMaps(new QueryWrapper<UserEntity>().allEq(map));

List<Long> ids=new ArrayList<Long>();
        ids.add(1L);
        ids.add(2L);
        ids.add(3L);
List<UserEntity> list = userDao.selectBatchIds(ids);

Page<UserEntity> page=userDao.selectPage(new Page<>(1,5), new QueryWrapper<UserEntity>().eq("user_sex", "男"));

Page<Map<String, Object>> page=userDao.selectMapsPage(new Page<>(1,5), new QueryWrapper<UserEntity>().eq("user_sex", "男"));

userDao.deleteById(1);

userDao.delete(new QueryWrapper<UserEntity>().eq("id", 1));

Map<String, Object> map=new HashMap<String, Object>();
        map.put("user_name", "zwqh");
        map.put("user_sex","男");
        userDao.deleteByMap(map);

List<Long> ids=new ArrayList<Long>();
        ids.add(1L);
        ids.add(2L);
        ids.add(3L);
        userDao.deleteBatchIds(ids);