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4

MapKeyJoinColumn.columnDefinition

Annotation Element javax.persistence.MapKeyJoinColumn String columnDefinition (Optional) The SQL fragment that is used when generating the DDL for the column. Defaults to SQL generated by the provider for the column. Default value: "" Since: JPA 2.0
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javax.persistence.MapKeyJoinColumns

2.0 See Also: MapKeyJoinColumn MapKeyJoinColumn[] value (Required) The map key join columns that are used to map to the entity that is the map key. (Required) The map key join columns that are used
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javax.persistence.GenerationType

must assign primary keys for the entity using a database identity column. Indicates that the persistence provider must assign primary keys for the entity using a database identity column. Since: JPA 1.0
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MapKeyColumn.unique

Annotation Element javax.persistence.MapKeyColumn boolean unique (Optional) Whether the column is a unique key. This is a shortcut for the UniqueConstraint annotation at the table level and is useful for when the unique key constraint corresponds to only a single column. This constraint applies in
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MapKeyColumn.precision

Annotation Element javax.persistence.MapKeyColumn int precision (Optional) The precision for a decimal (exact numeric) column. (Applies only if a decimal column is used.) Default: 0. (The value must be set by the developer.) Default value: 0 Since: JPA 2.0
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MapKeyColumn.scale

Annotation Element javax.persistence.MapKeyColumn int scale (Optional) The scale for a decimal (exact numeric) column. (Applies only if a decimal column is used.) Default value: 0 Since: JPA 2.0
0

Element.generateForeignKey

Annotation Element javax.jdo.annotations.Element String generateForeignKey Generate or assume a foreign key constraint exists on the column or columns associated with this join. Specify "true" or "false". Returns: whether to generate or assume a primary key constraint Default value: "" Since: JDO 2.1
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Element.indexed

Annotation Element javax.jdo.annotations.Element String indexed Whether the value column(s) should be indexed. Returns: whether the value column(s) should be indexed. Default value: "" Since: JDO 2.1
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Key.generateForeignKey

Annotation Element javax.jdo.annotations.Key String generateForeignKey Generate or assume a foreign key constraint exists on the column or columns associated with this join. Specify "true" or "false". Returns: whether to generate or assume a foreign key constraint Default value: "" Since: JDO 2.1
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Key.indexed

Annotation Element javax.jdo.annotations.Key String indexed Whether the value column(s) should be indexed. Returns: whether the value column(s) should be indexed. Default value: "" Since: JDO 2.1

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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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