MybtisPlus快速开发（从controller到mapper）-编程知识

MybtisPlus快速开发（从controller到mapper）

创建新项目

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写好配置文件

server:port: 8905#配置MP控制台打印日志
mybatis-plus:configuration:log-impl: org.apache.ibatis.logging.stdout.StdOutImplspring:datasource:type: com.zaxxer.hikari.HikariDataSourcedriver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3307/shequ-acl?characterEncoding=utf-8&useSSL=falseusername: rootpassword: rootjackson:date-format: yyyy-MM-dd HH:mm:sstime-zone: GMT+8

使用mybatisX插件快速生成一张表的相关类

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而后将生成好的文件夹剪切进创建好的目录中：

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引入依赖：

        <!--   -web依赖引入以后才会有@RestController注解     --><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.4.1</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!--Lombok引入--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency>

启动类上加扫描注解：

@SpringBootApplication
@MapperScan("com.mybatistest.mybatistest.mapper")
public class MybatistestApplication {public static void main(String[] args) {SpringApplication.run(MybatistestApplication.class, args);}}

写好Controller层

@RestController
@RequestMapping("mybatisPlus/test")
public class PermissionController {@AutowiredPermissionService permissionService;@AutowiredPermissionServiceSecond permissionServiceSecond;@GetMapping("/slectByNameSecond")public List<Permission> slectByNameSecond(@RequestParam String name){return permissionServiceSecond.slectByNameSecond(name);}@GetMapping("/slectByName")public List<Permission> queryByName(@RequestParam String name){return permissionService.queryByName(name);}
}

Mapper层

如果要在Service层注入mapper的话需要在mapper接口上加上@Repository注解

public interface PermissionMapper extends BaseMapper<Permission> {}

@Repository
public interface PermissionMapperSecond extends BaseMapper<Permission> {}

Service层

方式1：实现类不做继承

public interface PermissionService extends IService<Permission> {List<Permission> queryByName(String name);
}@Service
public class PermissionServiceImpl extends ServiceImpl<PermissionMapper, Permission>implements PermissionService{@Overridepublic List<Permission> queryByName(String name) {Permission permission = new Permission();permission.setName(name);QueryWrapper<Permission> queryWrapper = new QueryWrapper<Permission>(permission);List<Permission> permissions = baseMapper.selectList(queryWrapper);return permissions;}
}

方式二:实现类继承`ServiceImpl<xxMapper, xxEntity>`

public interface PermissionServiceSecond extends IService<Permission> {List<Permission> slectByNameSecond(String name);
}@Service
public class PermissionServiceSecondImpl implements PermissionServiceSecond {@AutowiredPermissionMapperSecond permissionMapperSecond;@Overridepublic List<Permission> slectByNameSecond(String name) {Permission permission = new Permission();permission.setName(name);QueryWrapper<Permission> queryWrapper = new QueryWrapper<Permission>(permission);List<Permission> permissions = permissionMapperSecond.selectList(queryWrapper);return permissions;}@Overridepublic boolean saveBatch(Collection<Permission> entityList, int batchSize) {return false;}@Overridepublic boolean saveOrUpdateBatch(Collection<Permission> entityList, int batchSize) {return false;}@Overridepublic boolean updateBatchById(Collection<Permission> entityList, int batchSize) {return false;}@Overridepublic boolean saveOrUpdate(Permission entity) {return false;}@Overridepublic Permission getOne(Wrapper<Permission> queryWrapper, boolean throwEx) {return null;}@Overridepublic Map<String, Object> getMap(Wrapper<Permission> queryWrapper) {return null;}@Overridepublic <V> V getObj(Wrapper<Permission> queryWrapper, Function<? super Object, V> mapper) {return null;}@Overridepublic BaseMapper<Permission> getBaseMapper() {return null;}@Overridepublic Class<Permission> getEntityClass() {return null;}
}

执行结果

[{"code": "btn.User.add","createTime": 1622455537000,"id": 7,"isDeleted": 0,"name": "添加","pid": 3,"type": 2,"updateTime": 1622507669000},{"code": "btn.Role.add","createTime": 1622455537000,"id": 12,"isDeleted": 0,"name": "添加","pid": 4,"type": 2,"updateTime": 1622507768000},{"code": "btn.Permission.add","createTime": 1622455537000,"id": 16,"isDeleted": 0,"name": "添加","pid": 5,"type": 2,"updateTime": 1622507859000},{"code": "btn.AttrGroup.add","createTime": 1624006384000,"id": 28,"isDeleted": 0,"name": "添加","pid": 27,"toCode": "AttrGroupAdd","type": 2,"updateTime": 1624006445000},{"createTime": 1624006770000,"id": 34,"isDeleted": 0,"name": "添加","pid": 33,"toCode": "SkuInfoAdd","type": 2,"updateTime": 1624006874000},{"code": "","createTime": 1624007141000,"id": 38,"isDeleted": 0,"name": "添加","pid": 37,"toCode": "ActivityInfoAdd","type": 2,"updateTime": 1624007173000},{"createTime": 1624007217000,"id": 41,"isDeleted": 0,"name": "添加","pid": 40,"toCode": "CouponInfoAdd","type": 2,"updateTime": 1624007242000}
]