Creating Mappings with Hibernate XML Files - Beginning Hibernate: From Novice to Professional - page 160

A typical implementation of an idbag mapping is as follows:

<idbag name="idbag" table="nameidbag">
<collection-id column="id" type="int">
<generator class="native"/>
</collection-id>

<key column="fooid"/>
<element type="string" column="name" not-null="true"/>
</idbag>

The map Collection
A map collection allows collection attributes derived from the Map interface to be persisted.
In addition to the common collection mappings, the <map> element offers the inverse ,
order-by , and sort attributes, as shown in Table 7-14.

Table 7-14. The Additional <map> Attributes

Attribute Values Default Description

inverse true , false false

Specifies that this entity is the opposite navigable end
of a relationship expressed in another entity's mapping

order-by

Specifies an arbitrary SQL order by clause to constrain
the results returned by the SQL query that populates
the map

sort unsorted Specifies the collection class sorting to be used. The

value can be unsorted , natural , or any Comparator
class

The child elements of the <map> element are as follows:

(meta*,
subselect?,
cache?,
synchronize*,
comment?,
key,
(map-key | composite-map-key | map-key-many-to-many |
index | composite-index | index-many-to-many |
index-many-to-any),
(element | one-to-many | many-to-many | composite-element |
many-to-any),
loader?,
sql-insert?,
sql-update?,
sql-delete?,
sql-delete-all?,
filter*)