About database

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Forum
15

explorer locks local database in readonly mode

down the whole process. i opened the database in readonly mode, but the file will be locked by the explorer ... database files while they are in use is already supported in client-server mode (consider using client-server mode for this purpose, but you will have to reopen the database to see changes
Forum
15

How to do an Offline Database Backup?

must close all connections, wait for current database activity to stop, and prevent new connections until the backup is complete.  How can I guarantee that a database is no longer being used?  I think I ... any JDOUserExceptions.   What is the proper way to do an offline database datastore file backup
Forum
15

how to operate with same object but two different Thread on database.

and same database. Description: i have three classes  GetterSetterclass.java here declare variables ... operation with that same object and same database. --------- So, point is two different operation, two different thread,one object(we can assume one table in sql), one database. if it will possible
Issue
15

Object DB Explorer fails to open database

. The code runs fine. i.e. Role objects are getting persisted in the database. But when I try to open the database using Object DB Explorer, it fails.  I have attached all the related files.  Regards, Md ... to open database.  I have a BaseEntity class which has an EntityListener named AuditListener associated
Forum
15

Should I Avoid Compressing Database Files?

find now, that led me to believe that ObjectDB database files do not compress well (in general ... in ObjectDB database files when I back them up or restore them from a backup. Do you have an experienced opinion on this approach? > ObjectDB database files do not compress well It depends
Issue
15

[Explorer] Editing Database Files

databases in a read only mode. The Explorer should support creating and storing new database objects and editing and updating existing database objects, visually, with no code. This is one of the features ... . Please subscribe to this feature request. Editing databases in the Explorer is now supported by ObjectDB 2.3. lwalkowski gorilla77 FastModel pikotenta
Tutorial
15

Step 4: Add a Servlet Class

response) throws ServletException, IOException { // Obtain a database connection ... , response); } finally { // Close the database connection: if (em ... (representing a database connection) is constructed. If a new guest has registered (using a JSP form
Tutorial
15

Step 4: Add a Servlet Class

, IOException { // Obtain a database connection: EntityManagerFactory emf ... { // Close the database connection: if (em.getTransaction().isActive ... the application scope attribute, and then an EntityManager (representing a database connection
FAQ
15

What is the Java Persistence API (JPA)?

The Java Persistence API (JPA) is a standard API for accessing databases from within Java applications. The main advantage of JPA over JDBC (the older Java API for interacting with databases ... . Using plain old Java objects (POJO) to represent persistent data can significantly simplify database
FAQ
15

Which API should I use - JPA or JDO?

code. When to prefer JDO JDO might be preferred when portability to other object databases is more important than general portability to both object and relational databases. JPA is designated to be used mainly with relational databases. ObjectDB is the only object database that supports JPA