About identity

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JDO Doc
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javax.jdo.annotations.DatastoreIdentity

identity of the class. Corresponds to the xml element "datastore-identity" of the "class" element. Since: JDO 2.1 String column Name of the column for the datastore identity Name of the column for the datastore identity Returns: Name of the column for the datastore identity Default value: "" Since: JDO
Manual
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Database Management Settings

is very useful for recurring queries with identical arguments. As long as the relevant data in
Manual
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Database Replication and Clustering

/ Write operations. The other (slave) nodes in the cluster manage identical copies of the same database
Manual
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SELECT clause (JPQL / Criteria API)

) FROM Country AS c This query is identical to the previous query above except that now the result
Result
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What is new in ObjectDB 2.0?

with different arguments. Query result cache for repeating queries with identical arguments. Improved
Manual
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JPA Primary Key

have their own separate identity. Automatic Primary Key By default the primary key is a sequential
Manual
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Deleting JPA Entity Objects

.REMOVE are identical, and if orphanRemoval=true is specified, CascadeType.REMOVE is redundant
Manual
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Detached Entity Objects

detached entity object is copied into an existing managed entity object with the same identity (i.e
JDO Doc
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JDO Annotations for Classes

JDO supports two modes of persistable classes that can be set by the following annotations: Non persistable classes that should be enhanced (because of accessing persistent fields of other classes directly) can be marked with: The identity mode of persistence capable classes can be specified by using:
Manual
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Query Parameters in JPA [2011-04-01]

parameters are identical. Named parameters can provide added value to the clarity of the query string