Fetch association in batches

Author: AnghelLeonard

HibernateSpringBootLoadBatchAssociation/README.md

@@ -1,12 +1,17 @@
 **[Fetching Associations In Batches Via `@BatchSize`](https://github.com/AnghelLeonard/Hibernate-SpringBoot/tree/master/HibernateSpringBootLoadBatchAssociation)**
-
-**Note:** Fetching associations in the same query with their parent can be done via `JOIN FETCH` or `@NamedEntityGraph`. But, Hibernate allows us to fetch associations in batches as well via `@BatchSize` annotation. This may be useful when `JOIN FETCH` and `@NamedEntityGraph` doesn't seem to help.
 
-**Description:** This application fetches all `Author` entities via a `SELECT` query. Further, calling the `getBooks()` method of the first `Author` entity will trigger another `SELECT` query that initializes the association of the first three `Author` entities returned by the previous `SELECT` query. This is the effect of `@BatchSize`.
+**Description:** This application uses `@BatchSize` at class/entity-level and collection-level. Consider `Author` and `Book` entities invovled in a bidirectional-lazy `@OneToMany` association.
+
+- First use case fetches all `Author` entities via a `SELECT` query. Further, calling the `getBooks()` method of the first `Author` entity will trigger another `SELECT` query that initializes the collections of the first three `Author` entities returned by the previous `SELECT` query. This is the effect of `@BatchSize` at `Author`'s collection-level.
+
+- Second use case fetches all `Book` entities via a `SELECT` query. Further, calling the `getAuthor()` method of the first `Book` entity will trigger another `SELECT` query that initializes the authors of the first three `Book` entities returned by the previous `SELECT` query. This is the effect of `@BatchSize` at `Author` class-level.
+
+**Note:** Fetching associated collections in the same query with their parent can be done via `JOIN FETCH` or entity graphs as well. Fetching children with their parents in the same query can be done via `JOIN FETCH`, entity graphs and `JOIN` as well.
 
 **Key points:**
 - `Author` and `Book` are in a lazy relationship (e.g., `@OneToMany` bidirectional relationship)
-- `Author` association is annotated with `@BatchSize(size = 3)`
+- `Author` entity is annotated with `@BatchSize(size = 3)`
+- `Author`'s collection is annotated with `@BatchSize(size = 3)`
 
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