javax.persistence

Annotation Type Index

@Target(value={})
 @Retention(value=RUNTIME)
public @interface Index

Used in schema generation to specify creation of an index.

Note that it is not necessary to specify an index for a primary key, as the primary key index will be created automatically.

The syntax of the columnList element is a column_list, as follows:

    column::= index_column [,index_column]*
    index_column::= column_name [ASC | DESC]
 

If ASC or DESC is not specified, ASC (ascending order) is assumed.

See Also:

Table, SecondaryTable, CollectionTable, JoinTable, TableGenerator

Since:

Java Persistence 2.1

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
java.lang.String	columnList (Required) The names of the columns to be included in the index, in order.

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
java.lang.String	name (Optional) The name of the index; defaults to a provider-generated name.
boolean	unique (Optional) Whether the index is unique.

Element Detail

columnList

public abstract java.lang.String columnList

(Required) The names of the columns to be included in the index, in order.

name

public abstract java.lang.String name

(Optional) The name of the index; defaults to a provider-generated name.

Default:

""

unique

public abstract boolean unique

(Optional) Whether the index is unique.

Default:

false