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General Performance Issues Illustrated with a Specific Method

General Performance Issues Illustrated with a Specific Method
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Persistent.primaryKey

Annotation Element javax.jdo.annotations.Persistent String primaryKey Whether this member is part of the primary key for application identity. This is equivalent to specifying @PrimaryKey as a separate annotation on the member. Returns: whether this member is part of the primary key Default value: "" Since: JDO 2.1
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Persistent.columns

Annotation Element javax.jdo.annotations.Persistent Column[] columns Column definition(s) for this member. Used for mapping multiple columns to the same member, for example relationships with multiple column foreign keys. Returns: the columns for this member Default value: {} Since: JDO 2.1
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FetchGroup.ALL

Static Field javax.jdo.FetchGroup String ALL For use with addCategory and removeCategory calls. This category includes all members in the persistent type. Using this category also sets the fetch-depth for the members in the default fetch group. Since: JDO 2.2
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javax.jdo.annotations.NotPersistent

javax.jdo.annotations Annotation NotPersistent Target: Fields (including property get methods) Annotation to specify that the member is not persistent. If used, this is the only JDO annotation allowed on a member. This corresponds to the xml attribute persistence-modifier="none" of the "field
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javax.jdo.annotations.PrimaryKey

javax.jdo.annotations Annotation PrimaryKey Target: Classes and fields (including property get methods) Annotation on a member to define it as a primary key member of a class or persistent interface using application identity. Also used to define the primary key columns of a secondary table
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Key.mappedBy

Annotation Element javax.jdo.annotations.Key String mappedBy Name of a member in the value class where this key is stored. Returns: the name of a member in the value class where this key is stored Default value: "" Since: JDO 2.1
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Value.mappedBy

Annotation Element javax.jdo.annotations.Value String mappedBy Name of a member in the key class where this value is stored. Returns: the name of a member in the key class where this value is stored Default value: "" Since: JDO 2.1
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Column.targetMember

Annotation Element javax.jdo.annotations.Column String targetMember Target member in the other class or interface for this column when part of a bidirectional relation. Returns: the target member for this column when part of a bidirectional relation. Default value: "" Since: JDO 2.1
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Embedded.ownerMember

Annotation Element javax.jdo.annotations.Embedded String ownerMember The member in the embedded object that links back to the owning object where it has a bidirectional relationship. Returns: the member that refers to the owner Default value: "" Since: JDO 2.1

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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