163 lines
6.2 KiB
Markdown
163 lines
6.2 KiB
Markdown
## diboot-core: 高效精简内核
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主要实现:
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1. 单表CRUD和多表关联查询的无SQL化
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2. Entity/DTO自动转换为QueryWrapper(@BindQuery注解绑定字段参数的查询条件,可自动构建关联查询)
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3. 提供其他常用开发场景的最佳实践封装。
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### ** 一. 单表CRUD无SQL
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> 依赖Mybatis-plus实现(Mybatis-plus具备通用Mapper方案和灵活的查询构造器)
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### ** 二. 多表关联查询无SQL
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> 通过@Bind*注解绑定关联,自动拆分成单表查询并绑定结果
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[(了解拆解关联查询的价值)](https://www.kancloud.cn/ddupl/sql_optimize/1141077)
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#### 1. 注解自动绑定数据字典(自定义枚举)的显示值Label
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~~~java
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@BindDict(type="USER_STATUS", field = "status")
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private String statusLabel;
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~~~
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#### 2. 注解自动绑定其他表的字段
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~~~java
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// 支持关联条件+附加条件绑定字段
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@BindField(entity=Department.class, field="name", condition="department_id=id AND parent_id>=0")
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private String deptName;
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// 支持通过中间表的级联关联绑定字段
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@BindField(entity = Organization.class, field="name", condition="this.department_id=department.id AND department.org_id=id")
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private String orgName;
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~~~
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#### 3. 注解自动绑定其他表实体Entity/VO
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~~~java
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// 支持关联条件+附加条件绑定Entity
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@BindEntity(entity = Department.class, condition="department_id=id")
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private Department department;
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// 通过中间表的级联关联绑定Entity(支持附加条件)
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@BindEntity(entity = Organization.class, condition = "this.department_id=department.id AND department.org_id=id AND department.deleted=0")
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private Organization organization;
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~~~
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#### 4. 注解自动绑定其他表实体集合List<Entity>
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~~~java
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// 支持关联条件+附加条件绑定多个Entity
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@BindEntityList(entity = Department.class, condition = "id=parent_id")
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private List<Department> children;
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// 通过中间表的 多对多关联 绑定Entity(支持附加条件)
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@BindEntityList(entity = Role.class, condition="this.id=user_role.user_id AND user_role.role_id=id")
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private List<Role> roleList;
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~~~
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#### 5. 注解自动绑定其他表某字段集合List<>
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~~~java
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// 支持关联条件+附加条件绑定多个Entity的某字段
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@BindFieldList(entity = Department.class, field="id", condition = "id=parent_id")
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private List<Long> childrenIds;
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// 通过中间表的 多对多关联 绑定Entity某字段(支持附加条件)
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@BindEntityList(entity = Role.class, field="code", condition="this.id=user_role.user_id AND user_role.role_id=id")
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private List<String> roleCodes;
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~~~
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### ** 三. 注解绑定关联的使用方式
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#### 1. 定义你的Entity对应的Service(继承diboot的BaseService)及Mapper
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> * 启用diboot-devtools,自动生成后端各层代码。
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#### 2. 参照以上注解说明在VO中定义你的关联
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#### 3. 使用注解绑定:
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调用Binder自动绑定注解相关关联:
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##### 方式1. 自动绑定关联(不需要转型)
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~~~java
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//List<MyUserVO> voList = ...;
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Binder.bindRelations(voList);
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~~~
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##### 方式2. 自动转型并绑定关联(需要转型)
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~~~java
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// 查询单表获取Entity集合
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// List<User> entityList = userService.list(queryWrapper);
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List<MyUserVO> voList = Binder.convertAndBindRelations(userList, MyUserVO.class);
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~~~
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### ** 四. Entity/DTO自动转换QueryWrapper自动构建Join查询
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#### 1. Entity/DTO中声明映射查询条件
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示例代码:
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~~~java
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public class UserDTO {
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// 无@BindQuery注解默认会映射为=条件
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private Long gender;
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// 有注解,映射为注解指定条件
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@BindQuery(comparison = Comparison.LIKE)
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private String realname;
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// join其他表
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@BindQuery(comparison = Comparison.STARTSWITH, entity=Organization.class, field="name", condition="this.org_id=id")
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private String orgName;
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}
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~~~
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#### 2. 调用QueryBuilder.toQueryWrapper(entityOrDto)进行转换
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~~~java
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/**
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* url参数示例: /list?gender=M&realname=张
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* 将映射为 queryWrapper.eq("gender", "M").like("realname", "张")
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*/
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@GetMapping("/list")
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public JsonResult getVOList(UserDto userDto) throws Exception{
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//调用super.buildQueryWrapper(entityOrDto) 进行转换
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QueryWrapper<User> queryWrapper = super.buildQueryWrapper(userDto);
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// 或者直接调用 QueryBuilder.toQueryWrapper(entityOrDto) 转换
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//QueryWrapper<User> queryWrapper = QueryBuilder.buildQueryWrapper(userDto);
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//... 查询list
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return JsonResult.OK(list);
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}
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~~~
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#### 3. 支持动态Join的关联查询与结果绑定
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> 动态查询的调用方式有以下两种:
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##### 方式1. 通过QueryBuilder链式调用
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~~~java
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QueryBuilder.toDynamicJoinQueryWrapper(dto).queryList(Department.class);
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~~~
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##### 方式2. 通过QueryBuilder构建QueryWrapper,再调用Binder或JoinsBinder
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~~~java
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// 构建QueryWrapper
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QueryWrapper<DTO> queryWrapper = QueryBuilder.toQueryWrapper(dto);
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// 调用join关联查询绑定
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List<Entity> list = Binder.joinQueryList(queryWrapper, Department.class);
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~~~
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绑定调用将自动按需(有表的查询字段时才Join)构建类似如下动态SQL并绑定结果:
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> SELECT self.* FROM user self
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LEFT OUTER JOIN organization r1 ON self.org_id=r1.id
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WHERE (r1.name LIKE ?) AND self.is_deleted=0
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### 五. 使用步骤与样例参考
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#### 1. 引入依赖
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Gradle:
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~~~gradle
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compile("com.diboot:diboot-core-spring-boot-starter:{latestVersion}")
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~~~
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或Maven
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~~~xml
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<dependency>
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<groupId>com.diboot</groupId>
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<artifactId>diboot-core-spring-boot-starter</artifactId>
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<version>{latestVersion}</version>
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</dependency>
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~~~
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#### 2. 配置数据源
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以Mysql为例:
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~~~properties
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#datasource config
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spring.datasource.url=jdbc:mysql://localhost:3306/diboot_example?characterEncoding=utf8&serverTimezone=GMT%2B8
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spring.datasource.username=diboot
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spring.datasource.password=123456
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spring.datasource.hikari.maximum-pool-size=5
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spring.datasource.hikari.driver-class-name=com.mysql.cj.jdbc.Driver
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~~~
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> * @BindDict注解需要依赖dictionary表,依赖diboot-core-spring-boot-starter,初次启动时starter会自动创建该表。
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#### 3. 详细文档 - [diboot-core 官方文档](https://www.diboot.com/guide/diboot-core/%E5%AE%89%E8%A3%85.html)
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#### 4. 参考样例 - [diboot-core-example](https://github.com/dibo-software/diboot-v2-example/tree/master/diboot-core-example)
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