Home » Search

About database

71-80 of 200Refresh
Manual
12

Deleting JPA Entity Objects

Existing entity objects can be deleted from the database either explicitly by invoking the remove ... from the database it has to first be retrieved (no matter which way) and then in an active ... (); The entity object is physically deleted from the database when the transaction is committed. Embedded
FAQ
12

Is ObjectDB scalable? What are its limitation?

ObjectDB is highly scalable and can manage efficiently databases in a wide range of sizes, from ... supports: Database file size up to 128 TB (= 131,072 GB = 134,217,728 MB). Up to 2,147,483,648 entity classes per database file. Up to 2,147,483,648 indexes per database file
Tutorial
12

Step 4: Add a Servlet Class

ServletException, IOException { // Obtain a database connection: EntityManagerFactory ... { // Close the database connection: if (em.getTransaction().isActive ... is retrieved from the application scope attribute, and then an EntityManager (representing a database
Tutorial
12

Step 4: Add a Servlet Class

{ // Obtain a database connection: EntityManagerFactory emf = (EntityManagerFactory ... ") .forward(request, response); } finally { // Close the database ... , and then an EntityManager (representing a database connection) is constructed. If a new guest
FAQ
12

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
12

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
Issue
12

500Mb ObjectDb database opening issue

Hi, I have observed that 500 Mb objectDb database opening time is very slow (~3 seconds ... any way to speed-up open time for big databases? Definitely, it's too long for 500 Mb database ... with ObjectDb databases which may have size more than 5Gb and opening database time
Forum
12

can't get HashMap out of the database

I'm trying to persist an Entity containing a HashMap. It stores the data in the database OK, but the map is always empty when I get the entity out of the database again. I've reproduced this problem ... stored in the database. The updated project attached. Regards, Natalia. You are right
Forum
12

Database crash

after reading the database file   File:   ------------------------------------------------------------------------------------------------------------------------ [2017-07-10 11:22:12 #1 store] Database 'F ... ] Server on port 3333 has started by 10380@wzbhb101 [2017-07-10 23:06:55 #3 store] Database 'F
Issue
12

InternalException in Database Doctor

Database Doctor has thrown an InternalException right after starting to diagnose or repair my DB file. The version of the Doctor used was 2.6.9_06. The stacktrace below:   Scanning the database ... ). Please report this error on http://www.objectdb.com/database/issue/new com.objectdb.o.InternalException