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docs:update use-in-kotlin.md
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@ -19,14 +19,14 @@
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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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```kotlin
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buildBootstrap {
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runFlex {
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// 配置数据源 相当于 setDataSource(dataSource)
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+dataSource
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// 配置Mapper 相当于 addMapper(AccountMapper::class.java)
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+AccountMapper::class
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// 配置日志输出 相当于 setLogImpl(StdOutImpl::class.java)
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logImpl = StdOutImpl::class
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}.start()
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}
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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<实体类>()` 查泛型对应的表的所有数据
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@ -34,53 +34,54 @@
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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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- 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` IS NOT NULL AND `age` >= 17 ORDER BY `id` DESC
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```
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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(QueryColumn("id"), QueryColumn("user_name"))
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.where(QueryColumn("age").isNotNull()).and(QueryColumn("age").ge(17))
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.orderBy(QueryColumn("id").desc())
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mapper<AccountMapper>().selectListByQuery(queryWrapper)
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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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* **扩展后**
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```kotlin
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// 无需注册Mapper与APT/KSP即可查询操作
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val accountList: List<Account> = query {
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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 * 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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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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