About collection

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Eclipse Public License - v 1.0

every other Contributor ("Indemnified Contributor") against any losses, damages and costs (collectively
Manual
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JPA / JDO Class Enhancer

of entity objects. With no enhancement, only persistent collection and map fields can be loaded lazily (by
Manual
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JPA Criteria API Queries

, substring, ...). Collection expressions (isEmpty, isNotEmpty, isMember, isNotMember, size). Comparison
Manual
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JPA Primary Key

continuously and can be collected by accessing a minimum number of database pages. On the other end
Manual
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Numbers in JPQL and Criteria Queries

Numeric values may appear in JPQL queries in many forms: as numeric literals - e.g. 123, -12.5. as parameters - when numeric values are assigned as arguments. as path expressions - in navigation to persistent numeric fields. as aggregate expressions - e.g. COUNT. as collection functions
Manual
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Obtaining a JPA Database Connection

. Database updates are collected and managed in memory and applied to the database
Manual
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ORDER BY clause (JPQL / Criteria API)

clause produces objects for examination and the WHERE clause selects which objects to collect as results
Manual
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Paths and Types in JPQL and Criteria API

class. The dot (.) operator cannot be applied to collections, maps and values of simple types
Manual
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Storing JPA Entity Objects

that field (multiple entity objects can be referenced by a collection field): @Entity class Employee
Manual
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Working with JPA Entity Objects

. The Persistence Context The persistence context is the collection of all the managed objects