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138

Support of modifying an ObjectDB Entity class (Schema Change)

If you modify an ObjectDB Entity class will it be supported by a database set up using the old class? I already have an idea to iterate through a database, getting each record and then creating a record of the new type and replacing it, but I was just wondering if there is an easier way or
22

Server User List

" ip="127.0.0.1" admin="true"> <dir path="/" permissions="access,modify,create,delete ... |modify|create|delete"> <quota directories="5" files="20" disk-space="5mb" /> </dir ... <dir path="/" permissions="access,modify,create,delete" /> <dir path="/$user/" permissions
17

Apache License, Version 2.0, January 2004

; and You must cause any modified files to carry prominent notices stating that You changed the files ... are for informational purposes only and do not modify the License. You may add Your own attribution notices ... , provided that such additional attribution notices cannot be construed as modifying the License
15

Locking in JPA

) is 1. In every transaction in which an entity object is modified its version number ... if the version numbers do not match, indicating that the object has been modified by another user (using ... marks the clean entity object as modified (dirty) and increases its version number by 1
15

UPDATE SET Queries in JPA/JPQL

its persistence context has been modified by an UPDATE query. Therefore, it is a good practice to use a separate EntityManager for UPDATE queries. As with any operation that modifies the database, UPDATE ... method returns the number of objects that have been modified by the query. Selective Update UPDATE
15

Obtaining a JPA Database Connection

to manipulate an ObjectDB database we need an EntityManager instance. Operations that modify database ... construction. Using an EntityTransaction Operations that modify database content, such as store ... that modify the database content, such as persist and remove. Database updates are collected and managed
15

Database Connection using JPA

, but it is a one time operation. Once constructed, it can serve the entire application. Operations that modify ... (); // Operations that modify the database should come here. em.getTransaction().commit ... of the managed entity is not affected by the rollback and is not returned to its pre-modified state. Ending
2

[ODB1] Chapter 8 - ObjectDB Server

" address="127.0.0.1"> <dir path="/"> <permissions access="+" modify="+" create ... .0.1"> <dir path="/"> <permissions access="+" modify="+" create="+" delete ... and its four attributes. The access permission enables opening database files and the modify permission enables
2

[ODB1] Chapter 3 - Persistent Classes

and fields) can have any access modifiers (i.e. public, protected, package or private). 3.2 Persistent ... can never be persistent. The transient modifier can be used to exclude other fields from being stored in ... , even though they are considered transient in JDO by default. A field with a transient modifier
2

[ODB1] Chapter 4 - JDO Metadata

is required only for changing the default. Therefore, only fields with modified behavior ... > <package name="test"> <class name="A"> <field name="f0" persistence-modifier="persistent" /> <field name="f1" persistence-modifier="none" /> <field name="f2" persistence-modifier

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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