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Read Only Database Connection with Hibernate
(3 answers)
Closed 6 years ago.
How can I make my database completely read-only for Hibernate? I don't want Hibernate to be able to change neither table definitions (e.g. create/delete/update tables) nor data in tables. Is there some setting in percictence.xml that makes connection read-only?
Hibernate only does what's asked of it - if you set hibernate.hbm2ddl to auto | update | create | create-drop it will try to modify the DB schema. If you run an insert, it will try to insert data. If you want the DB to be protected against it, assign read-only permissions to the DB user that Hibernate is configured to use.
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How to do select the data in batches using hibernate?
(5 answers)
Closed 5 years ago.
Say my query retrieves 30,000 records but I have to retrieve 3000 records in one batch. Totally I have to retrieve 30,000 records in 10 batches. I'm using spring hibernate, how to do?
Fetching data batch by batch using Spring and hibernate, refer below links :-
https://www.mkyong.com/hibernate/hibernate-fetching-strategies-examples/
http://www.javamakeuse.com/2015/03/tutorial-hibernate-4-batch-fetching.html
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Prepopulated database - Android application
(4 answers)
Closed 5 years ago.
I have done a lot of research about the SQLite database, and have already created a SQLite custom helper that extended SQLiteOpenHelper. However, I don't understand where to actually create the database and fill it out. I am trying to have the database be created immediately; I have all the information that needs to be inserted. In other words, no user input is required to fill it out.
Is the best practice to create an individual java class or activity that fills out the database, that can then be accessed by the activities?
Thanks - did a lot of research on creating the database and helper, just having trouble understanding this.
I am trying to have the database be created immediately; I have all the information that needs to be inserted.
Create the SQLite database on your development machine. Package it in assets/ and use SQLiteAssetHelper to ship it with your app. Then, you can query from that data (e.g., to display it to the user).
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How to call Oracle Function or Procedure using Hibernate (EntityManager) or JPA
(6 answers)
Closed 8 years ago.
Am new to hibernate. Am trying to call a oracle stored procedure through Hibernate. Can I get some steps to follow to call a procedure through Hibernate.
Thanks in advance.
Starting from JPA 2.1 You can use #NamedStoredProcedureQuery annotation. This annotation can be specified on an entity or mapped superclass
#NamedStoredProcedureQuery(name="fooStoredProcedure", procedureName="someProcedureName")
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EntityManger flushmode in JDBC
(1 answer)
Closed 8 years ago.
entityManager.setFlushMode(FlushModeType.AUTO)
entityManager.setFlushMode(FlushModeType.COMMIT)
What is the difference between above two and what is the advantage of using COMMIT flushMode?
JPA AUTO causes a flush to the database before a query is executed. Simple operations like find don't require a flush since the library can handle the search, however queries would be much more complicated, and so if AUTO is set, it will flush it first. If the mode is set to COMMIT, it will only flush the changes to the database upon a call to commit or flush. If COMMIT is set, and a query is run, it will not return results that have not been flushed.
Source: Another stack overflow question
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SQLite:"ALTER TABLE `game` ADD UNIQUE(`name`)" Error in SQLite
(1 answer)
Closed 8 years ago.
I have an existing database and I'd like to add the UNIQUE flag to one of the columns to prevent duplicates. What exactly would be the command to put in the onUpgrade section to achieve this?
Regretfully SQLite has very basic support for alter table - you can only either rename the table or add a column - see here.
However you can use similar approach to the one we use for renaming a column.