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In version 2.5.2_05 does not work greatest by Date

In version 2.5.2_05 does not work greatest by Date
30

Restrict by class in query

Restrict by class in query
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ObjectDB auto sharding by simple algorithm

ObjectDB auto sharding by simple algorithm
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javax.persistence.EntityManager

that are related or grouped by the application, and which must be colocated in their mapping to a single ... . The EntityManager API is used to create and remove persistent entity instances, to find entities by their primary key, and to query over entities. The set of entities that can be managed by a given EntityManager
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javax.jdo.annotations.FetchGroup

javax.jdo.annotations Annotation FetchGroup Target: Classes Annotation for the fetch group of a class. Corresponds to the xml element "fetch-group". Since: JDO 2.1 String[] fetchGroups Fetch groups to be nested (included) in this fetch group. Fetch groups to be nested (included) in this fetch group
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FetchGroup.DEFAULT

. This category includes members defined in the default fetch group in xml or annotations. Redefining the default fetch group via the API does not affect the members defined by this category. Using this category also sets the fetch-depth for the members in the default fetch group. Since: JDO 2.2
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retrieveAll(useFetchPlan, pcs)

fetch group must be retrieved, and the implementation might retrieve more fields than the current fetch group. If the useFetchPlan parameter is false, this method behaves exactly as the corresponding ... , and other fields might be fetched lazily by the implementation. If the useFetchPlan parameter is true
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retrieveAll(pcs, useFetchPlan)

fetch group must be retrieved, and the implementation might retrieve more fields than the current fetch group. If the useFetchPlan parameter is false, this method behaves exactly as the corresponding ... , and other fields might be fetched lazily by the implementation. If the useFetchPlan parameter is true
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retrieveAll(pcs, useFetchPlan)

fetch group must be retrieved, and the implementation might retrieve more fields than the current fetch group. If the useFetchPlan parameter is false, this method behaves exactly as the corresponding ... , and other fields might be fetched lazily by the implementation. If the useFetchPlan parameter is true
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[ODB1] Chapter 5 - JDO Connections

that every connection consumes. Database connections are managed in JDO by the javax.jdo ... is transparent. The functionality of PersistenceManager instances returned by the getPersistenceManager ... Properties can also be specified in a file, as demonstrated by the following properties file: javax.jdo

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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