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javax.persistence.Column

javax.persistence Annotation Column Target: Fields (including property get methods) Is used to specify the mapped column for a persistent property or field. If no Column annotation is specified, the default values apply. Example 1: @Column(name="DESC", nullable=false, length=512) public
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Column.precision

Annotation Element javax.persistence.Column int precision (Optional) The precision for a decimal (exact numeric) column. (Applies only if a decimal column is used.) Value must be set by developer if used when generating the DDL for the column. Default value: 0 Since: JPA 1.0
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javax.jdo.annotations.Column

javax.jdo.annotations Annotation Column Target: Fields (including property get methods) Annotation for a column in the database. Corresponds to the xml element "column". Since: JDO 2.1 String allowsNull Whether the column allows null values to be inserted. Whether the column allows null values
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javax.jdo.annotations.Columns

javax.jdo.annotations Annotation Columns Target: Classes and fields (including property get methods) Annotation for a group of columns. Since: JDO 2.1 Column[] value The columns annotation information. The columns annotation information. Returns: the columns 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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Join.columns

Annotation Element javax.jdo.annotations.Join Column[] columns Detail definition of the join column(s). This is needed for more than one join column. Returns: the join columns Default value: {} Since: JDO 2.1
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Column.target

Annotation Element javax.jdo.annotations.Column String target Target column for this column in the other table when part of a foreign key relation. Returns: the target column in the other table for this column when part of a foreign key relation. Default value: "" Since: JDO 2.1
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Value.columns

Annotation Element javax.jdo.annotations.Value Column[] columns The column(s) for the value. Returns: the column(s) for the value Default value: {} Since: JDO 2.1
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Discriminator.columns

Annotation Element javax.jdo.annotations.Discriminator Column[] columns The column(s) making up the discriminator. Returns: the column(s) making up the discriminator Default value: {} Since: JDO 2.1
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Key.columns

Annotation Element javax.jdo.annotations.Key Column[] columns The column(s) for the key Returns: the column(s) for the key 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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