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313 lines
8.6 KiB
Markdown
313 lines
8.6 KiB
Markdown
# MyBatis-Flex 和同类框架「功能」对比
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MyBatis-Flex 主要是和 `MyBatis-Plus` 与 `Fluent-MyBatis` 对比，内容来源其官网、git 或者 网络文章，若有错误欢迎纠正。
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- MyBatis-Plus：老牌的 MyBatis 增强框架，开源于 2016 年。
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- Fluent-MyBatis：阿里云开发的 MyBatis 增强框架（来自于阿里云·云效产品团队）
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> 本文只阐述了「功能」方面的对比，**「性能」** 对比请参考 [这里](./benchmark.md)。
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> 若发现对比中有错误，请加入 MyBatis-Flex QQ 交流群：532992631，然后联系群主纠正。
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## 功能对比
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| 功能或特点 | MyBatis-Flex | MyBatis-Plus | Fluent-MyBatis |
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| -------- | -------- | -------- | -------- |
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| 对 entity 的基本增删改查 | ✅ | ✅ | ✅ |
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| 分页查询 | ✅ | ✅ | ✅ |
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| 分页查询之总量缓存 | ✅ | ✅ | ❌ |
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| 分页查询无 SQL 解析设计（更轻量，及更高性能） | ✅ | ❌ | ✅ |
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| 多表查询： from 多张表 | ✅ | ❌ | ❌ |
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| 多表查询： left join、inner join 等等 | ✅ | ❌ | ✅ |
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| 多表查询： union，union all | ✅ | ❌ | ✅ |
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| 单主键配置 | ✅ | ✅ | ✅ |
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| 多种 id 生成策略 | ✅ | ✅ | ✅ |
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| 支持多主键、复合主键 | ✅ | ❌ | ❌ |
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| 字段的 typeHandler 配置 | ✅ | ✅ | ✅ |
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| 除了 MyBatis，无其他第三方依赖（更轻量） | ✅ | ❌ | ❌ |
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| QueryWrapper 是否支持在微服务项目下进行 RPC 传输 | ✅ | ❌ | 未知 |
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| 逻辑删除 | ✅ | ✅ | ✅ |
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| 乐观锁 | ✅ | ✅ | ✅ |
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| SQL 审计 | ✅ | ❌ | ❌ |
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| 数据填充 | ✅ | ✅ | ✅ |
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| 数据脱敏 | ✅ | ✔️ **（收费）** | ❌ |
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| 字段权限 | ✅ | ✔️ **（收费）** | ❌ |
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| 字段加密 | ✅ | ✔️ **（收费）** | ❌ |
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| 字典回写 | ✅ | ✔️ **（收费）** | ❌ |
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| Db + Row | ✅ | ❌ | ❌ |
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| Entity 监听 | ✅ | ❌ | ❌ |
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| 多数据源支持 | ✅ | 借助其他框架或收费 | ❌ |
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| 多数据源是否支持 Spring 的事务管理，比如 `@Transactional` 和 `TransactionTemplate` 等 | ✅ | ❌ | ❌ |
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| 多数据源是否支持 "非Spring" 项目 | ✅ | ❌ | ❌ |
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| 多租户 | ✅ | ✅ | ❌ |
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| 动态表名 | ✅ | ✅ | ❌ |
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| 动态 Schema | ✅ | ❌ | ❌ |
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> 以上内容来自第三方相关产品的官方文档或第三方平台，若有错误，欢迎纠正。
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## 基础查询
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**MyBatis-Flex：**
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````java
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QueryWrapper query = QueryWrapper.create()
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.where(EMPLOYEE.LAST_NAME.like(searchWord)) //条件为null时自动忽略
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.and(EMPLOYEE.GENDER.eq(1))
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.and(EMPLOYEE.AGE.gt(24));
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List<Employee> employees = employeeMapper.selectListByQuery(query);
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````
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**MyBatis-Plus：**
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````java
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QueryWrapper<Employee> queryWrapper = Wrappers.query()
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.like(searchWord != null, "last_name", searchWord)
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.eq("gender", 1)
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.gt("age", 24);
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List<Employee> employees = employeeMapper.selectList(queryWrapper);
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````
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或者 MyBatis-Plus 的 lambda 写法：
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```java
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LambdaQueryWrapper<Employee> queryWrapper = Wrappers.<Employee>lambdaQuery()
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.like(StringUtils.isNotEmpty(searchWord), Employee::getUserName,"B")
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.eq(Employee::getGender, 1)
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.gt(Employee::getAge, 24);
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List<Employee> employees = employeeMapper.selectList(queryWrapper);
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```
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**Fluent-MyBatis：**
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````java
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EmployeeQuery query = new EmployeeQuery()
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.where.lastName().like(searchWord, If::notNull)
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.and.gender().eq(1)
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.and.age().gt(24)
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.end();
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List<Employee> employees = employeeMapper.listEntity(query);
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````
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## 查询集合函数
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**MyBatis-Flex：**
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````java
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QueryWrapper query = QueryWrapper.create()
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.select(
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ACCOUNT.ID,
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ACCOUNT.USER_NAME,
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max(ACCOUNT.BIRTHDAY),
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avg(ACCOUNT.SEX).as("sex_avg")
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);
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List<Employee> employees = employeeMapper.selectListByQuery(query);
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````
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**MyBatis-Plus：**
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````java
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QueryWrapper<Employee> queryWrapper = Wrappers.query()
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.select(
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"id",
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"user_name",
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"max(birthday)",
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"avg(birthday) as sex_avg"
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);
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List<Employee> employees = employeeMapper.selectList(queryWrapper);
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````
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> 缺点：字段硬编码，容易拼错。无法使用 ide 的字段进行重构，无法使用 IDE 自动提示，发生错误不能及时发现。
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**Fluent-MyBatis：**
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````java
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EmployeeQuery query = new EmployeeQuery()
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.select
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.id()
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.userName()
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.max.birthday()
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.avg.sex("sex_avg")
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.end()
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List<Employee> employees = employeeMapper.listEntity(query);
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````
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>缺点：编写内容不符合 sql 直觉。
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## and(...) 和 or(...)
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假设我们要构建如下的 SQL 进行查询（需要在 SQL 中添加括号）。
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```sql
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SELECT * FROM tb_account
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WHERE id >= 100
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AND (sex = 1 OR sex = 2)
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OR (age IN (18,19,20) AND user_name LIKE "%michael%" )
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```
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**MyBatis-Flex：**
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```java
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QueryWrapper query = QueryWrapper.create()
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.where(ACCOUNT.ID.ge(100))
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.and(ACCOUNT.SEX.eq(1).or(ACCOUNT.SEX.eq(2)))
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.or(ACCOUNT.AGE.in(18, 19, 20).and(ACCOUNT.USER_NAME.like("michael")));
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```
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**MyBatis-Plus：**
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```java
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QueryWrapper<Employee> query = Wrappers.query()
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.ge("id", 100)
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.and(i -> i.eq("sex", 1).or(x -> x.eq("sex", 2)))
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.or(i -> i.in("age", 18, 19, 20).like("user_name", "michael"));
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// or lambda
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LambdaQueryWrapper<Employee> query = Wrappers.<Employee>lambdaQuery()
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.ge(Employee::getId, 100)
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.and(i -> i.eq(Employee::getSex, 1).or(x -> x.eq(Employee::getSex, 2)))
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.or(i -> i.in(Employee::getAge, 18, 19, 20).like(Employee::getUserName, "michael"));
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```
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**Fluent-MyBatis：**
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```java
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AccountQuery query = new AccountQuery()
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.where.id().ge(100)
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.and(
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new AccountQuery().where.sex().eq(1).or(
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new AccountQuery().where.sex().eq(2).end()
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).end())
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.or(
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new AccountQuery().where.age.in(18,19,20)
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.and.userName().like("michael").end()
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)
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.end();
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```
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> 缺点：许多 `.end()` 方法调用，容易忘记出错（或者写错了？欢迎纠正）。
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## 多表查询 1
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**MyBatis-Flex：**
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````java
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QueryWrapper query = QueryWrapper.create()
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.select().from(ACCOUNT)
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.leftJoin(ARTICLE).on(ACCOUNT.ID.eq(ARTICLE.ACCOUNT_ID))
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.where(ACCOUNT.AGE.ge(10));
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List<Account> accounts = mapper.selectListByQuery(query);
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````
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**MyBatis-Plus：**
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````java
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// 不支持~~~~
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````
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**Fluent-MyBatis：**
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````java
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StudentQuery leftQuery = new StudentQuery("a1").selectAll()
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.where.age().eq(34)
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.end();
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HomeAddressQuery rightQuery = new HomeAddressQuery("a2")
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.where.address().like("address")
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.end();
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IQuery query = leftQuery
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.join(rightQuery)
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.on(l -> l.where.homeAddressId(), r -> r.where.id()).endJoin()
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.build();
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List<StudentEntity> entities = this.mapper.listEntity(query);
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````
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>缺点：编写内容不符合 sql 直觉。同时在编写 `end()` 和 `endJoin()` 容易忘记。
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## 多表查询 2
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假设查询的 SQL 如下：
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```sql
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SELECT a.id, a.user_name, b.id AS articleId, b.title
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FROM tb_account AS a, tb_article AS b
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WHERE a.id = b.account_id
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```
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**MyBatis-Flex：**
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````java
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QueryWrapper query = new QueryWrapper()
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.select(
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ACCOUNT.ID
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, ACCOUNT.USER_NAME
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, ARTICLE.ID.as("articleId")
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, ARTICLE.TITLE)
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.from(ACCOUNT.as("a"), ARTICLE.as("b"))
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.where(ACCOUNT.ID.eq(ARTICLE.ACCOUNT_ID));
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````
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**MyBatis-Plus：**
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````java
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// 不支持~~~~
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````
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**Fluent-MyBatis：**
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````java
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// 不支持~~~~
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````
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>PS：也有可能是笔者自己不知道如何支持，而非 Fluent-MyBatis 原因，有知道的同学可以给下示例代码。
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## 部分字段更新
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假设一个实体类 Account 中，我们要更新其内容如下：
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- `userName` 为 "michael"
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- `age` 为 "18"
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- `birthday` 为 null
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其他字段保持数据库原有内容不变，要求执行的 SQL 如下：
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```sql
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update tb_account
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set user_name = "michael", age = 18, birthday = null
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where id = 100
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```
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**MyBatis-Flex** 代码如下：
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```java
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Account account = UpdateEntity.of(Account.class);
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account.setId(100); //设置主键
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account.setUserName("michael");
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account.setAge(18);
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account.setBirthday(null);
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accountMapper.update(account);
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```
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**MyBatis-Plus** 代码如下（或可使用 MyBatis-Plus 的 `LambdaUpdateWrapper`，但性能没有 `UpdateWrapper` 好）：
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```java
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UpdateWrapper<Account> updateWrapper = new UpdateWrapper<>();
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updateWrapper.eq("id", 100);
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updateWrapper.set("user_name", "michael");
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updateWrapper.set("age", 18);
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updateWrapper.set("birthday", null);
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accountMapper.update(null, updateWrapper);
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```
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**Fluent-MyBatis** 代码如下：
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```java
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AccountUpdate update = new AccountUpdate()
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.update.userName().is("michael")
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.age().is(18)
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.birthday().is(null)
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.end()
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.where.id().eq(100)
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.end();
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accountMapper.updateBy(update);
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```
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