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4

MapKeyColumn.columnDefinition

Annotation Element javax.persistence.MapKeyColumn String columnDefinition (Optional) The SQL fragment that is used when generating the DDL for the column. Defaults to the generated SQL to create a column of the inferred type. Default value: "" Since: JPA 2.0
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MapKeyColumn.length

Annotation Element javax.persistence.MapKeyColumn int length (Optional) The column length. (Applies only if a string-valued column is used.) Default value: 255 Since: JPA 2.0
4

javax.persistence.GeneratedValue

") @Column(name="CUST_ID") public Long getId() { return id; } Example 2: @Id @GeneratedValue(strategy=TABLE, generator="CUST_GEN") @Column(name="CUST_ID") Long id
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javax.persistence.Lob

, and except for string and character-based types defaults to Blob. Example 1: @Lob @Basic(fetch=LAZY) @Column(name="REPORT") protected String report; Example 2: @Lob @Basic(fetch=LAZY) @Column(name="EMP
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DiscriminatorColumn.columnDefinition

Annotation Element javax.persistence.DiscriminatorColumn String columnDefinition (Optional) The SQL fragment that is used when generating the DDL for the discriminator column. Defaults to the provider-generated SQL to create a column of the specified discriminator type. Default value: "" Since: JPA 1.0
4

OrderColumn.columnDefinition

Annotation Element javax.persistence.OrderColumn String columnDefinition (Optional) The SQL fragment that is used when generating the DDL for the column. Defaults to generated SQL to create a column of the inferred type. Default value: "" Since: JPA 2.0
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JoinColumn.columnDefinition

Annotation Element javax.persistence.JoinColumn String columnDefinition (Optional) The SQL fragment that is used when generating the DDL for the column. Defaults to the generated SQL for the column. Default value: "" Since: JPA 1.0
0

Value.unique

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

Annotation Element javax.jdo.annotations.Value 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.unique

Annotation Element javax.jdo.annotations.Key String unique Whether the element column(s) contents should be considered unique Returns: whether the element column(s) contents should be considered unique 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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