程序包 org.babyfish.jimmer.sql

注释接口 Transient

@Documented @Retention(RUNTIME) @Target(allowedTargets=PROPERTY) @Target(METHOD) public @interface Transient

Example-1: Transient property


 public class BookStore {

     ...omit other properties...

     @Transient
     String userData();

 }

Example-2: Complex calculation property whose return type is scalar type


 public class BookStore {

     ...omit other properties...

     @Id
     long id();

     @Transient(BookStoreAvgPriceResolver.class)
     BigDecimal avgPrice();
 }

 class BookStoreAvgPriceResolver implements TransientResolver<Long, BigDecimal>{
     ...omit code...
 }

Example-3: Complex calculation property whose return type is entity type


 public class BookStore {

     ...omit other properties...

     @Id
     long id();

     @Transient(BookStoreMostPopularAuthorResolver.class)
     Author mostPopularAuthor();
 }

 class BookStoreMostPopularAuthorResolver implements TransientResolver<Long, Long>{
     ...omit code...
 }

Example-4: Complex calculation property whose return type is list of entity type


 public class BookStore {

     ...omit other properties...

     @Id
     long id();

     @Transient(BookStoreNewestBooksResolver.class)
     List<Book> newestBooks();
 }

 class BookStoreNewestBooksResolver implements TransientResolver<Long, List<Long>>{
     ...omit code...
 }
另请参阅:

  • 可选元素概要

    可选元素
    修饰符和类型
    可选元素
    说明
    Class<?>
    value
    If this argument is not specified, the decorated property is a transient property, that means you can only get and set(by draft) it and ORM will ignore it.

  • 元素详细资料

    • value

      Class<?> value

      If this argument is not specified, the decorated property is a transient property, that means you can only get and set(by draft) it and ORM will ignore it.

      Otherwise, the decorated property is a complex calculation property that means you can add it into ObjectFetcher and jimmer will load it in query.

      `@Transient` with `value` means complex calculation means complex calculation property, You can also view Formula which can be used as simple calcluation property

      返回:

      A class implements `org.babyfish.jimmer.sql.TransientResolver` of jimmer-sql or `org.babyfish.jimmer.sql.kt.KTransientResolver` of jimmer-sql-kotlin.

      The first type argument of `TransientResolver` should the `ID` of declaring entity type

      • If the current calculation property returns simple type, the second type argument of `TransientResolver` should be return type of current property
      • If the current calculation property returns entity type, the second type argument of `TransientResolver` should be `ID` of target entity type
      • If the current calculation property returns a list whose element type is entity type, the second type argument of `TransientResolver` should be a list whose element type is `ID` of target entity type
      默认值:
      void.class