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76

Database crash

: ------------------------------------------------------------------------------------------------------------------------ [2017-07-10 11:22:12 #1 store] Database 'F ... on port 3333 has started by 10380@wzbhb101 [2017-07-10 23:06:55 #3 store] Database 'F:\Hummingbird ... #1 store] Database 'F:\Hummingbird\Objectdb\db\coreSystemDb.odb' is opened by 11028@wzbhb101 [2017
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Database Explorer

Objects To construct new entity objects and store them in the database, open the [Create New Entity ... to construct and store the new entity objects. Editing Values and References You can edit simple field ... Unicode. ObjectDB stores String instances in the database using the same encoding that they have in
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Database Schema Evolution

of an entity class are detected by ObjectDB. New entity objects have to be stored in the new class schema, and old entity objects, which were stored previously in the old class schema ... object is only updated to the new schema when that entity object is stored to the database
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Working with JPA Entity Objects

requires using entity objects for many operations, including storing, retrieving, updating and deleting ... , the owning EntityManager stores the new entity object to the database. More details on storing objects are provided in the Storing Entities section. Entity objects retrieved from the database by
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What are the main benefits of using ObjectDB?

. The ability to store ordinary objects in the database directly can simplify the code significantly ... ObjectDB is especially designed to store and manage graphs of objects efficiently. That can accelerate ... fields can be stored by ObjectDB simply as part of the containing object. Relational databases lack
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Step 3: Add a Main Class

to store Point objects in the database and then retrieve them from the database. Use copy and paste ... ("$objectdb/db/p2.odb"); EntityManager em = emf.createEntityManager(); // Store 1000 ... (); } } The main method creates an ObjectDB database file, stores 1000 Point objects in the database
1

javax.jdo.PersistenceManagerFactory

. PersistenceManagerFactory instances may be configured and serialized for later use. They may be stored ... () Get the driver name for the data store connection. Get the driver name for the data store connection. Returns: the driver name for the data store connection. Since: JDO 1.0 Object getConnectionFactory
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javax.jdo.JDOEntityManager

) Delete the persistent instance from the data store. Delete the persistent instance from the data store. This method must be called in an active transaction. The data store object will be removed ... of the instance is not deleted from the data store. This method has no effect if the instance
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javax.jdo.PersistenceManager

.0 void deletePersistent(Object pc) Delete the persistent instance from the data store. Delete the persistent instance from the data store. This method must be called in an active transaction. The data store object will be removed at commit. Unlike makePersistent, which makes the closure
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javax.jdo.spi.PersistenceCapable.ObjectIdFieldManager

. This field will be stored in the proper field of the ObjectId. Parameters: fieldNumber - the field number of the key field. Returns: the value of the field to be stored into the ObjectId. Since: JDO 1.0 ... the field manager. This field will be stored in the proper field of the ObjectId. Parameters

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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