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27

Eager Fetch of Map with Entities as Keys

{         @Id private long id = 1;         @OneToMany(fetch=FetchType.EAGER)         Map map = new
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ObjectDB Object Database Features

calculations. Lazy/Eager Loading Automatic pre-loading optimizations. Configurable JPA eager/lazy
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JPA Entity Fields

.ALL) MyEntity field2; @OneToMany(fetch=FetchType.EAGER) List<MyEntity> field3; } The entity
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Setting and Tuning of JPA Queries

ObjectDB. "objectdb.result-fetch" - sets fetch mode for query result as either "EAGER" (the default) or
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javax.persistence.spi.ProviderUtil

of all attributes for which FetchType.EAGER has been specified have been loaded, this method returns LoadState ... of all attributes for which FetchType.EAGER has been specified have been loaded, this method returns ... all attributes with FetchType.EAGER have been loaded, this method returns LoadState.NOT_LOADED
6

Basic.fetch

of the field or property should be lazily loaded or must be eagerly fetched. The EAGER strategy ... strategy is a hint to the persistence provider runtime. If not specified, defaults to EAGER. Default value: javax.persistence.FetchType.EAGER Since: JPA 1.0
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javax.persistence.Basic

property should be lazily loaded or must be eagerly fetched. The EAGER strategy is a requirement ... to the persistence provider runtime. If not specified, defaults to EAGER. Default value: javax.persistence.FetchType.EAGER Since: JPA 1.0 boolean optional (Optional) Defines whether the value
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ManyToOne.fetch

Annotation Element javax.persistence.ManyToOne FetchType fetch (Optional) Whether the association should be lazily loaded or must be eagerly fetched. The EAGER strategy is a requirement ... is a hint to the persistence provider runtime. Default value: javax.persistence.FetchType.EAGER Since: JPA 1.0
5

isLoaded(entity)

for which FetchType.EAGER has been specified have been loaded, this method returns LoadState.LOADED ... with FetchType.EAGER have been loaded, this method returns LoadState.NOT_LOADED. If the provider cannot determine
5

javax.persistence.ManyToOne

should be lazily loaded or must be eagerly fetched. The EAGER strategy is a requirement ... to the persistence provider runtime. Default value: javax.persistence.FetchType.EAGER Since: JPA 1.0

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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