m

pl/java/libfws/spring/data/jpa/docs/presentations.txt

@@ -49,6 +49,17 @@ JPoint - Ilya and Fedor Sazonov - DB Tamer of 48:02
     !   https://www.youtube.com/watch?v=mIxr65ZGGFw
     !       hikari
     ! 43:00 pgBouncer ?
+Devoxx - Performance oriented Spring Data JPA & Hibernate by Maciej Walkowiak 23:00 of 43:43
+    !!!
+    https://www.youtube.com/watch?v=exqfB1WaqIw
+    ! DB connection pool (hikari) should not be too big (even 100 is big)
+    ! need to optimize queries
+        https://github.com/gavlyukovskiy/spring-boot-data-source-decorator
+        https://p6spy.readthedocs.io/en/latest/index.html
+    ! to post-pone connection obtaining till real DB-call
+    !   spring.datasource.hikari.auto-commit=false # spring will not open connection untill real DB access
+    ! if long ext-call is after DB-call - need to use spring transactionTemplate
+    !   
 Amplicode - Lombok Problems with Spring Data JPA 0:00 of 12:00
     https://www.youtube.com/watch?v=7kdQTh4oOQM
 Build faster persistence layers with Spring Data JPA 3 by Thorben Janssen @ Spring I/O 2024 0:00 of 49:49
@@ -56,8 +67,6 @@ Build faster persistence layers with Spring Data JPA 3 by Thorben Janssen @ Spri
     https://2024.springio.net/slides/build-faster-persistence-layers-with-spring-data-jpa-3-springio24.pdf
 Telusko - Spring Data JPA 0:00 of 28:27
     https://www.youtube.com/watch?v=ImBqsE2exGo
-Devoxx - Performance oriented Spring Data JPA & Hibernate by Maciej Walkowiak 14:00 of 43:43
-    https://www.youtube.com/watch?v=exqfB1WaqIw
 2023
 Spilka - JPA/Hibernate Fundamentals 2023 of 7 parts
     https://www.youtube.com/playlist?list=PLEocw3gLFc8UYNv0uRG399GSggi8icTL6

pl/java/libfws/spring/data/jpa/docs/tips.txt

@@ -3,7 +3,11 @@ https://habr.com/ru/articles/265061/
 2024
 https://habr.com/ru/articles/824936/
 https://habr.com/ru/companies/magnit/articles/814573/
-    ! criteria-api
+    ! which to replace criteria-api by - QueryDSL
-    @OneToMany 
+    @DynamicUpdate - to not cache update p-stmt
-	  @Fetch(FetchMode.SUBSELECT) // but does now work with pagination, hbm-bug
+    ! for N+1 problem solving
-    @Formula-annotation
+    @OneToMany @BatchSize(size=50)
+	  @OneToMany @Fetch(FetchMode.SUBSELECT) // but does now work with pagination, hbm-bug
+    @Formula("price * quantity")
+    @Formula("SEQURE_RAND(quantity)")
+    @Formula("(select count(*) from FORMULA_TABLE f where f.price < price)") 

pl/java/libfws/spring/data/jpa/features/metamodel.txt

@@ -0,0 +1,16 @@
+https://projectlombok.org/features/experimental/FieldNameConstants
+
+https://habr.com/ru/companies/magnit/articles/814573/
+
+ext { 
+	jpamodelgenVersion = '6.4.4.Final' 
+}
+
+implementation "org.hibernate:hibernate-jpamodelgen:${jpamodelgenVersion}" 
+annotationProcessor "org.hibernate:hibernate-jpamodelgen:${jpamodelgenVersion}"
+
+sourceSets.main.java.srcDirs += layout.buildDirectory.dir("/generated") 
+ 
+compileJava { 
+	options.generatedSourceOutputDirectory = layout.buildDirectory.dir("/generated") 
+}

pl/java/libfws/spring/data/jpa/features/transaction-locks.txt

@@ -1,3 +1,7 @@
+https://docs.spring.io/spring-framework/reference/data-access/transaction/programmatic.html
+    TransactionTemplate
+    TransactionalOperator
+
 https://docs.oracle.com/javaee/7/api/javax/persistence/LockModeType.html
     READ,  OPTIMISTIC, (obtains an optimistic read lock for all entities containing a version attribute)
                         persistence provider will prevent our data from dirty reads as well as non-repeatable reads.
@@ -41,6 +45,8 @@ https://www.linkedin.com/pulse/implementing-optimistic-pessimistic-locking-sprin
     adv, disadv
     https://github.com/csdavidg/db-locking-poc
 2022
+https://habr.com/ru/articles/682362/
+    https://www.marcobehler.com/guides/spring-transaction-management-transactional-in-depth
 https://vladmihalcea.com/spring-transaction-best-practices/
     https://vladmihalcea.com/read-write-read-only-transaction-routing-spring/
 https://vladmihalcea.com/spring-data-jpa-locking/
@@ -117,5 +123,8 @@ https://hackernoon.com/optimistic-and-pessimistic-locking-in-jpa
 2021
 https://habr.com/ru/company/otus/blog/574470/
     spring transactional errors
+2020
+https://habr.com/ru/articles/532000/
+    !!! like a ref-ce
 2017
 https://habr.com/ru/articles/325470/

pl/java/libfws/spring/data/jpa/tools/mihalcea-flexypool.txt

@@ -0,0 +1,2 @@
+https://github.com/vladmihalcea/flexy-pool
+implementation 'com.vladmihalcea.flexy-pool:flexy-pool-parent:2.2.3'

pl/java/libfws/spring/data/jpa/tools/sprig-boot-data-source-decorator.txt

@@ -0,0 +1,9 @@
+https://github.com/gavlyukovskiy/spring-boot-data-source-decorator
+
+decorator.datasource.datasource-proxy.slow-query.enable-logging=true
+decorator.datasource.datasource-proxy.slow-query.log-level=warn
+decorator.datasource.datasource-proxy.slow-query.logger-name=
+# Number of seconds to consider query as slow and log it
+decorator.datasource.datasource-proxy.slow-query.threshold=300
+
+decorator.datasource.datasource-proxy.multiline=true