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As I explained in my book, many times, you are better off replacing collections with a query, which is much more flexible in terms of fetching performance.However, there are times when mapping a collection is the right thing to do, and then you have two choices: Post post = new Post("First post"); Comments().add( new Post Comment("My first review") ); Comments().add( new Post Comment("My second review") ); Comments().add( new Post Comment("My third review") ); entity Manager.persist(post); insert into post (title, id) values ('First post', 1) insert into post_comment (review, id) values ('My first review', 2) insert into post_comment (review, id) values ('My second review', 3) insert into post_comment (review, id) values ('My third review', 4) insert into post_post_comment (Post_id, comments_id) values (1, 2) insert into post_post_comment (Post_id, comments_id) values (1, 3) insert into post_post_comment (Post_id, comments_id) values (1, 4) relationship, and it’s not very efficient either.AUTO) @Column(name = "LOCATION_ID") private Long id; @One To Many( cascade = , fetch = Fetch Type.EAGER ) @Join Table( join Columns = , inverse Join Columns = ) private [email protected] public class Attribute implements IAttribute Support { @Id @Generated Value(strategy = Generation Type.Post post = new Post("First post"); Comment( new Post Comment("My first review") ); Comment( new Post Comment("My second review") ); Comment( new Post Comment("My third review") ); entity Manager.persist(post); insert into post (title, id) values ('First post', 1) insert into post_comment (post_id, review, id) values (1, 'My first review', 2) insert into post_comment (post_id, review, id) values (1, 'My second review', 3) insert into post_comment (post_id, review, id) values (1, 'My third review', 4) Even if the collection is not managed anymore, it’s rather trivial to just add/remove child entities whenever necessary.

For convenience, to take advantage of the entity state transitions and the dirty checking mechanism, many developers choose to map the child entities as a collection in the parent object, and, for this purpose, JPA offers the annotation.DROP TABLE IF EXISTS `stock`; CREATE TABLE `stock` ( `STOCK_ID` int(10) unsigned NOT NULL AUTO_INCREMENT, `STOCK_CODE` varchar(10) NOT NULL, `STOCK_NAME` varchar(20) NOT NULL, PRIMARY KEY (`STOCK_ID`) USING BTREE, UNIQUE KEY `UNI_STOCK_NAME` (`STOCK_NAME`), UNIQUE KEY `UNI_STOCK_ID` (`STOCK_CODE`) USING BTREE ) ENGINE=Inno DB AUTO_INCREMENT=34 DEFAULT CHARSET=utf8; DROP TABLE IF EXISTS `mkyongdb`.`stock_daily_record`; CREATE TABLE `mkyongdb`.`stock_daily_record` ( `RECORD_ID` int(10) unsigned NOT NULL AUTO_INCREMENT, `PRICE_OPEN` float(6,2) DEFAULT NULL, `PRICE_CLOSE` float(6,2) DEFAULT NULL, `PRICE_CHANGE` float(6,2) DEFAULT NULL, `VOLUME` bigint(20) unsigned DEFAULT NULL, `DATE` date NOT NULL, `STOCK_ID` int(10) unsigned NOT NULL, PRIMARY KEY (`RECORD_ID`) USING BTREE, UNIQUE KEY `UNI_STOCK_DAILY_DATE` (`DATE`), KEY `FK_STOCK_TRANSACTION_STOCK_ID` (`STOCK_ID`), CONSTRAINT `FK_STOCK_TRANSACTION_STOCK_ID` FOREIGN KEY (`STOCK_ID`) REFERENCES `stock` (`STOCK_ID`) ON DELETE CASCADE ON UPDATE CASCADE ) ENGINE=Inno DB AUTO_INCREMENT=36 DEFAULT CHARSET=utf8; package com.mkyong; import Hibernate Util; public class App Hibernate one to many (XML Mapping) Hibernate: insert into mkyongdb.stock (STOCK_CODE, STOCK_NAME) values (? ) Hibernate: insert into mkyongdb.stock_daily_record (STOCK_ID, PRICE_OPEN, PRICE_CLOSE, PRICE_CHANGE, VOLUME, DATE) values (? Constraint Violation Exception: Validation failed for classes [com.saagie.picsaagie2017_frontend.domain.Hyper Parameter] during update time for groups [javax.validation.groups.

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