About FROM
FROM clause (JPQL / Criteria API)
Explains how to use the FROM clause and JOIN expressions in a JPA/JPQL query. The FROM clause declares query identification variables that represent iteration ... FETCH Reserved Identifiers FROM and JOIN in Criteria Queries Range Variables ... JPQL does not provide a way to exclude descendant classes from iteration at the FROM clause level. JPA 2, however, adds support for ...
Criteria Query From Elements
Reference (JavaDoc) of JPA query criteria FROM clause interfaces, including From, Root, Join and Fetch.... 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. ...
from(entityClass)
Create and add a query root corresponding to the given entity, forming a cartesian product with any existing roots.(Method of javax.persistence.criteria.AbstractQuery)
javax.persistence.criteria.From
Represents a bound type, usually an entity that appears in the from clause, but may also be an embeddable belonging to an entity in the from clause.(Interface of JPA)
JPA Query Structure (JPQL / Criteria)
Explains the structure of a JPQL query, which consists of 6 clauses: SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY.... and return entity objects rather than just field values from database tables, as with SQL. That makes JPQL more object oriented ... in the following format: SELECT ... FROM ... [ WHERE ... ] [ GROUP BY ...
Paths and Types in JPQL and Criteria API
Explains how to use object expressions (path navigation, type) in JPA/JPQL.... types of expressions: Variables - FROM identification variables and SELECT result variables. ... as arguments. Path expressions that navigate from one object to another. Instances of user defined persistable ...
Chapter 4 - JPA Queries (JPQL / Criteria)
Describes the Java Persistence Query Language (JPQL), the JPA Criteria API, and explains how to use queries in JPA.... by describing the main clauses of JPQL queries (SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY): JPA Query Structure ...
from(entity)
Create and add a query root corresponding to the given entity, forming a cartesian product with any existing roots.(Method of javax.persistence.criteria.AbstractQuery)
migration path from JPA / Hibernate
Hi. Is there a conversion tool or documentation that is of help when migrating an existing JPA solution to ObjectDB? Any recommendations or known pitfalls when it comes to ... ... towards JPA / Hibernate migrating data from existing relational databases in use with JPA / Hibernate like ... writing a small JPA program that retrieves entity objects from Hibernate, detaches them and then persists them using ObjectDB. A tool ...
javax.jdo.PersistenceManager
PersistenceManager is the primary interface for JDO-aware application components.(Interface of JDO)
