When not using a second level cache it is usually not a problem to do not have the relationship methods correctly implemented because the instances get discarded at the end of the transaction.
Userrole (userroleid, createddate, deleteddate, isactive, ROLEID, USERID) values (default, ? Open Session In View Filter Internal(Open Session In View Filter.java:198) at org.filter.
Transient; @Entity @Table(name = "stock_category", catalog = "mkyongdb") @Association Overrides() public class Stock Category implements
Serializable session.begin Transaction(); Stock stock = new Stock(); Stock Code("7052"); Stock Name("PADINI"); Category category1 = new Category("CONSUMER", "CONSUMER COMPANY"); //new category, need save to get the id first session.save(category1); Stock Category stock Category = new Stock Category(); stock Stock(stock); stock Category(category1); stock Created Date(new Date()); //extra column stock Created By("system"); //extra column Stock Categories().add(stock Category); session.save(stock); Transaction().commit(); Hibernate: insert into mkyongdb.category (`DESC`, NAME) values (? ) Hibernate: insert into mkyongdb.stock (STOCK_CODE, STOCK_NAME) values (?
In few articles, they even suggested that just forget about what is “inverse”, and always put inverse=”true” in the collection variable.
This statement is always true – “put inverse=true in collection variable”, but do not blindfold on it, try to understand the reason behind is essential to optimal your Hibernate performance.
Hibernate: insert into mkyongdb.stock_category (CREATED_BY, CREATED_DATE, CATEGORY_ID, STOCK_ID) values (? NAME as NAME1_0_ from mkyongdb.category category0_ where category0_. Hibernate: insert into mkyongdb.stock (STOCK_CODE, STOCK_NAME) values (?
CATEGORY_ID as CATEGORY1_1_0_, category0_.`DESC` as DESC2_1_0_, category0_.
Also it allows you to apply cascading options to both directions.
Note that navigational access is not always good, especially for "one-to-very-many" and "many-to-very-many" relationships.
Always put inverse=”true” in your collection variable ? Now, it means “stock Daily Records” is the relationship owner, and “stock” will not maintains the relationship. When a “Stock” object is saved, Hibernate will generated two SQL insert statements.
There are many Hibernate articles try to explain the “inverse” with many Hibernate “official” jargon, which is very hard to understand (at least to me). ) Hibernate: update mkyongdb.stock_daily_record set STOCK_ID=? session.begin Transaction(); Stock stock = new Stock(); Stock Code("7052"); Stock Name("PADINI"); Stock Daily Record stock Daily Records = new Stock Daily Record(); stock Daily Price Open(new Float("1.2")); stock Daily Price Close(new Float("1.1")); stock Daily Price Change(new Float("10.0")); stock Daily Volume(3000000L); stock Daily Date(new Date()); stock Daily Stock(stock); Stock Daily Records().add(stock Daily Records); session.save(stock); session.save(stock Daily Records); Transaction().commit(); 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 (?
In Hibernate, only the “relationship owner” should maintain the relationship, and the “inverse” keyword is created to defines which side is the owner to maintain the relationship. ) Hibernate: update mkyongdb.stock_daily_record set STOCK_ID=?