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WHERE clause (JPQL / Criteria API)

: SELECT c, l FROM Country c JOIN c.languages l WHERE c.population > :p AND l in :languages The FROM
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UPDATE SET Queries in JPA/JPQL

name) for iteration. Multiple variables and JOIN are not supported. The SET clause defines one or
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SELECT clause (JPQL / Criteria API)

can be added to the SELECT clause by using a bound JOIN variable in the FROM clause. Nested path expressions
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DELETE Queries in JPA/JPQL

multiple variables and JOIN, and cannot include the GROUP BY, HAVING and ORDER BY clauses
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JPA Criteria API Queries

). FROM clause (from, join, fetch). WHERE clause (where). GROUP BY / HAVING clauses (groupBy, having
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JPA Query Structure (JPQL / Criteria)

, multiselect, array, tuple, construct). Criteria FROM (from, join, fetch). Criteria WHERE (where). Criteria
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Online Backup

);     Thread backupThread = backupQuery.getSingleResult();     backupThread.join(); // Wait
8

javax.persistence.criteria.JoinType

, Comparable<JoinType> Defines the three types of joins. Right outer joins and right outer fetch joins are not required to be supported in Java Persistence 2.0. Applications that use RIGHT join types will not be portable. Since: JPA 2.0 JoinType INNER Inner join. Inner join. Since: JPA 2.0 JoinType LEFT
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javax.persistence.PrimaryKeyJoinColumn

get methods) Specifies a primary key column that is used as a foreign key to join to another table. It is used to join the primary table of an entity subclass in the JOINED mapping strategy to the primary table of its superclass; it is used within a SecondaryTable annotation to join a secondary table
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javax.persistence.AssociationOverride

, the joinColumns element is used. If the relationship mapping uses a join table, the joinTable element must be specified to override the mapping of the join table and/or its join columns. Example 1: Overriding ... See Also: Embedded Embeddable MappedSuperclass AttributeOverride JoinColumn[] joinColumns The join

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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