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5

Working with JPA Entity Objects

should always result in the same in-memory entity object. Another way of looking
5

ObjectDB Website - Terms and Conditions of Use

representations concerning the accuracy, likely results, or reliability of the use of the materials
5

Database Server

, which is much more efficient. As a result, embedded mode should be preferred when possible. For example
5

JPA Primary Key

. This is especially useful when using queries that return large result sets. As an example, consider a real time
4

javax.persistence.SqlResultSetMapping

of the result of a native SQL query. Example: Query q = em.createNativeQuery( "SELECT o.id AS order ... Specifies the result set mapping to scalar values. Specifies the result set mapping to scalar values. Default value: {} Since: JPA 1.0 EntityResult[] entities Specifies the result set mapping
4

javax.persistence.EntityManager

resultClass - the type of the query result Returns: the new query instance Throws: IllegalArgumentException ... or if the query result is found to not be assignable to the specified type Since: JPA 2.0 Query ... . Parameters: sqlString - a native SQL query string resultClass - the class of the resulting instance
3

javax.persistence.criteria.Fetch

of the join Returns: the resulting fetch join Throws: IllegalArgumentException - if attribute of the given ... of the join jt - join type Returns: the resulting fetch join Throws: IllegalArgumentException ... - target of the join Returns: the resulting join Since: JPA 2.0 Fetch<X,Y> fetch( SingularAttribute
0

[ODB1] Chapter 1 - About ObjectDB

(for example, as a result of special customer needs or requests) can be done without modifying code. The JDO
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javax.jdo.JDOEntityManager

metadata resultClass - the type of the query result Returns: the new query instance Throws ... to be invalid or if the query result is found to not be assignable to the specified type Since: JPA 2.0 ... of the resulting instance(s) Returns: the new query instance Since: JPA 1.0 Query createNativeQuery(String
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javax.jdo.annotations.Query

of the query (mandatory) Returns: the name of the query Since: JDO 2.1 Class resultClass Result class into which to put the results. Result class into which to put the results. Returns: the class of the result Default value: void.class Since: JDO 2.1 String unique Whether the query returns a single

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.

Need Help?

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