From 3836dae4de94d7c1ae0e185c8000bbce570ec1e3 Mon Sep 17 00:00:00 2001
From: Ihar Hancharenka <iigoncharenko@gmail.com>
Date: Wed, 12 Jul 2023 21:38:53 +0300
Subject: [PATCH] m

---
 .../spring/data/jpa/features/audit-envers.txt |  8 +++++++
 .../spring/data/jpa/features/mappings.txt     | 22 +++++++++++++++++++
 .../spring/data/jpa/features/projections.txt  |  2 ++
 3 files changed, 32 insertions(+)
 create mode 100644 pl/java/libfws/spring/data/jpa/features/mappings.txt

diff --git a/pl/java/libfws/spring/data/jpa/features/audit-envers.txt b/pl/java/libfws/spring/data/jpa/features/audit-envers.txt
index cb768cef0..98b27f9cb 100644
--- a/pl/java/libfws/spring/data/jpa/features/audit-envers.txt
+++ b/pl/java/libfws/spring/data/jpa/features/audit-envers.txt
@@ -1,4 +1,12 @@
 https://docs.jboss.org/envers/docs/#configuration
+https://spring.io/projects/spring-data-envers
+https://github.com/hibernate/hibernate-orm/blob/main/hibernate-envers/src/main/java/org/hibernate/envers/configuration/EnversSettings.java
+
+spring.jpa.properties
+  org.hibernate.envers:
+    audit_strategy: class-name
+    audit_strategy_validity_store_revend_timestamp: bool
+    store_data_at_delete: bool
 
 2023
 https://habr.com/ru/post/715918/
diff --git a/pl/java/libfws/spring/data/jpa/features/mappings.txt b/pl/java/libfws/spring/data/jpa/features/mappings.txt
new file mode 100644
index 000000000..a8e24cdf1
--- /dev/null
+++ b/pl/java/libfws/spring/data/jpa/features/mappings.txt
@@ -0,0 +1,22 @@
+https://www.baeldung.com/jpa-joincolumn-vs-mappedby
+    In a One-to-Many/Many-to-One relationship,
+    the owning side is usually defined on the many side of the relationship (joincolumn -> FK)
+
+    The value of mappedBy (at non-owning reference side)
+        is the name of the association-mapping attribute (java) on the owning side
+
+    cascade attr - on the owning side
+
+https://www.baeldung.com/jpa-join-column
+    The @JoinColumn annotation combined with a @OneToOne mapping indicates
+    that a given column in the owner entity refers to a primary key in the reference entity:
+
+@JoinFormula
+
+@ManyToOne
+    EAGER by default
+@OneToMany
+    LAZY by default
+
+2021
+https://habr.com/ru/articles/542328/
diff --git a/pl/java/libfws/spring/data/jpa/features/projections.txt b/pl/java/libfws/spring/data/jpa/features/projections.txt
index 33b6494c3..c39f03002 100644
--- a/pl/java/libfws/spring/data/jpa/features/projections.txt
+++ b/pl/java/libfws/spring/data/jpa/features/projections.txt
@@ -3,3 +3,5 @@ https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#projections
 2020
 https://thorben-janssen.com/spring-data-jpa-query-projections/
     https://habr.com/ru/company/otus/blog/722060/
+
+Can have multiple @Entity for the same table