Fast Object Database for Java - with JPA/JDO support

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183

FROM clause (JPQL / Criteria API)

The FROM clause declares query identification variables that represent iteration over objects in ... are always polymorphic. JPQL does not provide a way to exclude descendant classes from iteration at the FROM clause level. JPA 2, however, adds support for filtering instances of specific types
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Criteria Query From Elements

The interfaces in this group are in use for setting a criteria query FROM clause. Criteria Query Variables The FROM clause in JPA queries (as in SQL) defines the query variables. Query variables are represented in criteria queries by descendant interfaces of the From interface: Range variables
141

Upgrade from ObjectDB 1.0

The following pages should be read by ObjectDB 1.0 users: If you need help in upgrading your application from version 1.0 to version 2.0 - please feel free to contact ObjectDB Support.
141

How to upgrade from ObjectDB 1.0?

Upgrade - Step By Step To upgrade an existing application that uses ObjectDB 1.0 to ObjectDB 2.0: Replace the old ObjectDB and JDO jar files with the new objectdb.jar file. Make sure that the old jar files are removed from the classpath (check both the build classpath and the execution classpath
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javax.persistence.criteria.From

javax.persistence.criteria Interface From Superinterfaces: Expression, FetchParentfrom clause, but may also be an embeddable belonging to an entity in the from clause. Serves as a factory for Joins
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getCorrelationParent()

Method javax.persistence.criteria.From From getCorrelationParent() Returns the parent From object from which the correlated From object has been obtained through correlation (use of a Subquery correlate method). Returns: the parent of the correlated From object Throws: IllegalStateException
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getJoins()

Method javax.persistence.criteria.From Set> getJoins() Return the joins that have been made from this bound type. Returns empty set if no joins have been made from this bound type. Modifications to the set do not affect the query. Returns: joins made from this type Since: JPA 2.0
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substring(x, from, len)

Method javax.persistence.criteria.CriteriaBuilder Expression substring( Expression x, Expression from, Expression len ) Create an expression for substring extraction ... . Parameters: x - string expression from - start position expression len - length expression Returns
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substring(x, from)

Method javax.persistence.criteria.CriteriaBuilder Expression substring( Expression x, Expression from ) Create an expression for substring extraction. Extracts a substring ... - string expression from - start position expression Returns: expression corresponding to substring extraction Since: JPA 2.0
42

isCorrelated()

Method javax.persistence.criteria.From boolean isCorrelated() Whether the From object has been obtained as a result of correlation (use of a Subquery correlate method). Returns: boolean indicating whether the object has been obtained through correlation Since: JPA 2.0

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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