Fast Object Database for Java - with JPA/JDO support

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FROM clause (JPQL / Criteria API)

that appear earlier in the FROM clause. Join variables can also be bound to a single value path expression ... to a single value expression are less commonly used because usually they can be replaced by ... skips any outer variable value (e.g. any Country) that has no matching inner variable (e.g. a Capital

Database Explorer

, every column represents a persistent field, and the content of a cell is the value of a single field in ... and the values of its persistent fields are represented as child nodes. Tree windows provide easier ... to construct and store the new entity objects. Editing Values and References You can edit simple field

Database Management Settings

is needed. Small initial size and resize values save space. Larger values can improve performance by ... attribute (whose value is "true" or "false") specifies if recovery file is used. The sync attribute (whose value is "true" or "false") specifies if physical writing is required before commit returns

[ODB1] Chapter 9 - ObjectDB Explorer

a persistent field, and the content of a cell is the value of a single field in a single database object ... , and the values of its persistent fields are represents by child nodes. The main advantage of using ... is useful in order to avoid losing values of that field if the field has been renamed in the IDE


. Expression abs( Expression x) Create an expression that returns the absolute value of its argument. Create an expression that returns the absolute value of its argument. Parameters: x - expression Returns: absolute value Since: JPA 2.0 Expression all( Subquery subquery) Create

Entity Management Settings

specifies enhancement related settings: The agent attribute (whose value is "true" or "false ... can manage non enhanced classes by using reflection at the cost of performance. The possible values ... the persistence context of the EntityManager (which serves as a first level cache). The valid values are "weak

Database Schema Evolution

entity object is initialized using the value of the matching old field in the original entity object ... with default values (0, false or null). Fields in the old schema that do not have matching fields in the new ... with a default value (0, false or null). The following type conversions are supported: From any numeric type

[ODB1] Chapter 3 - Persistent Classes

values at runtime when the object is stored in the database. For example, a field whose type is Number ... time, e.g. an Integer, or null value. Similarly, a field whose type is one of the persistent ... indirectly by calling a method or by getting its value as an argument to a method, on the other hand, does

Shared (L2) Entity Cache

size, 0, indicates that the cache is disabled. To enable the cache a positive value has to be specified ... ="javax.persistence.sharedCache.mode" value="ALL"/>           ...    The javax.persistence.sharedCache.mode property can be set to one of the following values


Since: JPA 2.0 CollectionAttribute getCollection(String name) Return the Collection-valued attribute of the managed type that corresponds to the specified name. Return the Collection-valued attribute ... > getCollection(String name, Class elementType) Return the Collection-valued attribute

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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