orm - ordered many-to-many association hibernate mapping -



orm - ordered many-to-many association hibernate mapping -

i'm creating class diagram in visual paradigm "orm persistable" types "a" , "b", holds ordered list of b. i'm trying configure many-to-many association in class diagram, association navigable a->b , order of b instances in list given order added list @ runtime. when visual paradigm creates hibernate mapping files should result in association table "a2b" in erd fields "a_id", "b_id", "order_idx", , hibernate mapping type "a" defining list property "bs" list-index "order_idx" of association table, in:

<class name="a" table="a"> <id name="id" column="id" /> <list name="bs" table="a2b"> <key column="a_id" /> <list-index column="order_idx" base="1" /> <many-to-many class="b" column="b_id" /> </list> </class>

but can't working. visual paradigm creates index columns in association table both type , b , list instances in b type (although association not navigable in direction). if seek create association type a->b "order" property, doesn't work out (which quite clear, tried lead ...). when define orm->collection type->list, error message: null (a->b) ordered relationship not specify ordered column.

how can define such association in visual paradigm in class diagram?

i've got feedback visual paradigm solving issue: define ordered collection between java types "a" , "b" resulting in list collection in hibernate mapping 1 has go through next steps:

define orm persistable types in class diagram

create erd diagram types, e.g. visual paradigm move "right-click combined mouse drag".

add "order column" association table "a" table "a_b". right click association , take "open specification". then click check-box "ordered" , take column order index. in illustration no such column yet exists, take "create column..." in example, column name "index" , datatype int(10) have configured (because column didn't exist before) this results in erd diagram depicted below: then configure association table "b" table "a_b" ordered , utilize same index column. now ordered many-to-many uni-directional association configured , visual paradigm able create hibernate mapping cited in question above. feine sache :-)

hibernate orm visual-paradigm

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