Hibernate merge not updating

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) Stock stock = new Stock(); Stock Daily Record stock Daily Records = new Stock Daily Record(); //set the stock and stock Daily Records data stock Daily Stock(stock); Stock Daily Records().add(stock Daily Records); session.save(stock); Hibernate: insert into mkyong.stock (STOCK_CODE, STOCK_NAME) values (? ) Hibernate: insert into mkyong.stock_daily_record (STOCK_ID, PRICE_OPEN, PRICE_CLOSE, PRICE_CHANGE, VOLUME, DATE) values (? How about if you just want to delete two referenced ‘stock Daily Records’ records? You need to delete the ‘stock Daily Records’ one by one.

Query q = session.create Query("from Stock where stock Code = :stock Code "); Parameter("stock Code", "4715"); Stock stock = (Stock)q.list().get(0); for (Stock Daily Record sdr : Stock Daily Records()) session.delete(stock); In above cascade delete option, if you delete a Stock , all its referenced ‘stock Daily Records’ will be deleted from database as well.

The expression can be defined using the formula attribute of the element. Hibernate Template is a helper class which provides different methods for querying/retrieving data from the database.

It also converts checked Hibernate Exceptions into unchecked Data Access Exceptions.

) The code session.save(stock Daily Records); is no longer required, when you save the ‘Stock’, it will “cascade” the save operation to it’s referenced ‘stock Daily Records’ and save both into database automatically.

Cascade is a very convenient feature to manage the state of the other side automatically.

A proxy is returned when actually a load is called on a session. The proxy is created by default by Hibernate, for mapping a class to a file.

In this example, if a ‘Stock’ is saved, all its referenced ‘stock Daily Records’ should be saved into database as well. Stock Daily Record sdr1 = (Stock Daily Record)session.get(Stock Daily Record.class, new Integer(56)); Stock Daily Record sdr2 = (Stock Daily Record)session.get(Stock Daily Record.class, new Integer(57)); Stock stock = (Stock)session.get(Stock.class, new Integer(2)); Stock Daily Records().remove(sdr1); Stock Daily Records().remove(sdr2); Or Update(stock); Further study – Cascade – JPA & Hibernate annotation common mistake.

Stock stock = new Stock(); Stock Daily Record stock Daily Records = new Stock Daily Record(); //set the stock and stock Daily Records data stock Daily Stock(stock); Stock Daily Records().add(stock Daily Records); session.save(stock); session.save(stock Daily Records); Hibernate: insert into mkyong.stock (STOCK_CODE, STOCK_NAME) values (? ) Hibernate: insert into mkyong.stock_daily_record (STOCK_ID, PRICE_OPEN, PRICE_CLOSE, PRICE_CHANGE, VOLUME, DATE) values (? Both are totally different notions, see the differential here.

Alternatively hibernate annotations can be used as part of your persistent class code instead of the *xml files.

Ans: The properties that are not mapped to a column, but calculated at runtime by evaluation of an expression are called derived properties.

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