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docs:修改kt文档git链接顺序与完善文档内容
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>它继承了 Mybatis-Flex 轻量的特性,同时拥有 Kotlin 特有的扩展方法、中缀表达式与DSL等语法支持,
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>使其拥有了更高的灵活性。让我们可以更加轻松的在 Kotlin 中使用 Mybaits-Flex 所带来的开发效率和开发体验。
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Git 地址:https://github.com/KAMO030/MyBatis-Flex-Kotlin
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* [Gitee](https://gitee.com/mybatis-flex/mybatis-flex-kotlin)
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* [Github](https://github.com/KAMO030/MyBatis-Flex-Kotlin)
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## 特征
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@ -17,11 +15,6 @@ Git 地址:https://github.com/KAMO030/MyBatis-Flex-Kotlin
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- 简明:使用 DSL 让查询语句更加简单明了
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- 快捷:结合 Kotlin 特性快速对数据库进行操作
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## 快速开始
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点击链接进入详情:
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https://github.com/KAMO030/MyBatis-Flex-Kotlin#%E5%BF%AB%E9%80%9F%E5%BC%80%E5%A7%8B
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## 亮点
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- 快速构建启动:通过DSL➕重载运算符,快速配置 MybatisFlexBootstrap 实例并启动:
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@ -36,31 +29,58 @@ https://github.com/KAMO030/MyBatis-Flex-Kotlin#%E5%BF%AB%E9%80%9F%E5%BC%80%E5%A7
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}.start()
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```
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- 快速查询数据:通过DSL➕泛型快速编写查询语句并查询: (快速查询提供三个函数:all, filter 和 query )
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>- `all<Account>()` 查泛型对应的表的所有数据
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>- `filter<Account>(vararg columns: QueryColumn?, condition: ()->QueryCondition)` 按条件查泛型对应的表的数据
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>- `query<Account>(queryScope: QueryScope.()->Unit)` 较复杂查泛型对应的表的数据 (如分组,排序等)
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- 简明地构建条件:通过中缀表达式➕扩展方法能更加简单明了的构建条件:
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>- `all<实体类>()` 查泛型对应的表的所有数据
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>- `filter<实体类>(vararg KProperty<*>, ()->QueryCondition)` 按条件查泛型对应的表的数据
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>- `query<实体类>(QueryScope.()->Unit)` 较复杂查泛型对应的表的数据 (如: 分组,排序等)
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* **【原生方式】**
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```kotlin
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val queryWrapper = QueryWrapper.create()
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.select(Account::id.column(), Account::userName.column())
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.where(Account::age.column().`in`(17, 18, 19))
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.orderBy(Account::id.column().desc())
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mapper<AccountMapper>().selectListByQuery(queryWrapper)
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```
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- 简明地构建查询:通过中缀表达式➕扩展方法能更加简单明了的构建条件:
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* **【对比原生】**
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* **原生**
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```kotlin
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val queryWrapper = QueryWrapper.create()
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.select(Account::id.column(), Account::userName.column())
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.where(Account::age.column().isNotNull()).and(Account::age.column().ge(17))
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.orderBy(Account::id.column().desc())
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mapper<AccountMapper>().selectListByQuery(queryWrapper)
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```
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* **【扩展方式】**
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```kotlin
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query<Account> {
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select(Account::id, Account::userName)
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where { Account::age `in` (17..19) } orderBy -Account::id
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}
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```
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> 执行的SQL:
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* **扩展后**
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```kotlin
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query<Account> {
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select(Account::id, Account::userName)
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where(Account::age.isNotNull) and { Account::age ge 17 } orderBy -Account::id
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}
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```
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执行的SQL:
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```sql
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SELECT `id`, `user_name` FROM `tb_account` WHERE `age` IN (17, 18, 19) ORDER BY `id` DESC
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SELECT `id`, `user_name` FROM `tb_account` WHERE `age` IS NOT NULL AND `age` >= 17 ORDER BY `id` DESC
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```
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* **【条件优化】**
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- 例如: 查询属性是否在一个连续的区间时,会自动将 IN 转为 BETWEEN 调用
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```kotlin
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filter<Account> { Account::age `in` (17..19) }
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```
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执行的SQL:
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```sql
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SELECT * FROM `tb_account` WHERE `age` BETWEEN 17 AND 19
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```
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- 例如: 构建多属性组合 IN (最多支持三个属性)
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```kotlin
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filter<Account> {
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(Account::id to Account::userName to Account::age).inTriple(
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1 to "张三" to 18,
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2 to "李四" to 19,
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)
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}
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```
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执行的SQL:
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```sql
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SELECT * FROM `tb_account`
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WHERE (`id` = 1 AND `user_name` = '张三' AND `age` = 18)
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OR (`id` = 2 AND `user_name` = '李四' AND `age` = 19)
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```
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- 摆脱APT: 使用扩展方法摆脱对 APT(注解处理器) 的使用,直接使用属性引用让代码更加灵活优雅:
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> 使用APT: `ACCOUNT.ID eq 1` ,使用属性引用: `Account::id eq 1`
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>
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@ -74,6 +94,9 @@ https://github.com/KAMO030/MyBatis-Flex-Kotlin#%E5%BF%AB%E9%80%9F%E5%BC%80%E5%A7
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## 总结
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引入 Mybatis-Flex-Kotlin 扩展模块在 Kotlin 中使用 Mybaits-Flex 能够基于 Kotlin 强大的语法特性可以让我们更加轻松方便地操作数据库,极大提高了开发效率和开发体验。
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> 如何引入 Mybatis-Flex-Kotlin 扩展模块在 Kotlin 中使用 :
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>* [gitee](https://gitee.com/mybatis-flex/mybatis-flex-kotlin)
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>* [github](https://github.com/KAMO030/MyBatis-Flex-Kotlin)
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## 快速开始
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点击链接进入详情:
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- https://github.com/KAMO030/MyBatis-Flex-Kotlin#快速开始
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- https://gitee.com/mybatis-flex/mybatis-flex-kotlin#快速开始
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