About jpql

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11

Consulting and Training

with ObjectDB and goes to exploring design alternatives, advanced JPQL, using ObjectDB with JEE (EJB
Manual
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JPA Named Queries

A named query is a statically defined query with a predefined unchangeable query string. Using named queries instead of dynamic queries may improve code organization by separating the JPQL query strings from the Java code. It also enforces the use of query parameters rather than embedding literals
Manual
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Updating JPA Entity Objects

have to be modified in one operation. The UPDATE Queries in JPA/JPQL in chapter 4 explains how to use JPA UPDATE queries.
JPA Doc
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Criteria Query Selection and Results

, since they might be useful also in string based JPQL queries. Using tuples with non criteria queries is supported
Forum
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JPQL query to get entities that does not have a child entity in their child entities

JPQL query to get entities that does not have a child entity in their child entities
Issue
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JPQL support for mapped by (inverse) collections

JPQL support for mapped by (inverse) collections
Forum
11

KEY() / VALUE() not recognized in JPQL??

KEY() / VALUE() not recognized in JPQL??
JPA Doc
4

javax.persistence.Query

javax.persistence Interface Query Subinterfaces: TypedQuery Interface used to control query execution. Since: JPA 1.0 See Also: TypedQuery Parameter Learn how to define and use JPA/JPQL queries in ... .0 ObjectDB Notes: Learn how to define and use JPA/JPQL queries in Chapter 4 of the ObjectDB/JPA
JPA Doc
4

javax.persistence.TypedQuery

/JPQL queries in Chapter 4 of the ObjectDB/JPA manual. int executeUpdate() Execute an update or delete ... result Since: JPA 2.0 ObjectDB Notes: Learn how to define and use JPA/JPQL queries in Chapter 4
JPA Doc
3

getFirstResult()

Method javax.persistence.Query int getFirstResult() The position of the first result the query object was set to retrieve. Returns 0 if setFirstResult was not applied to the query object. Returns: position of the first result Since: JPA 2.0 Learn how to define and use JPA/JPQL queries in Chapter 4 of the ObjectDB/JPA manual.