Conditional updates & deletes通过提交任何爪哇，斯卡拉，科特林或任何本地人JVM代码/功能。 有没有查询语言。
仅仅是JVM函数/代码，我们可以
- Be more expressive in writing our query logic as we are not restricted by rules of a query language.
- Use external Java libraries within our queries like Joda-Time for time management, Jackson or Circe for JSON parsing etc.
- Write test-cases using familiar testing libraries like JUnit, kotlin.test, ScalaTest etc.
- Type-safe - catch errors during compile time.
- Fast - No runtime parsing & compiling performance cost. See these benchmarks that show 482,000+ writes per second. Function updates follow the same write path as any basic write and do not incur any extra cost.
Example
一个简单的示例可以创建一个Map<串, 双>那存储产品名称作为关键和价钱作为价值。 您可以使用自定义类（产品.java值），但为了简单起见串和双用来。
更新逻辑：如果产品的有效期限还不到2天，请给予50％的折扣！