# Unidirectional & Bi directional

Dilip Gamage
Ranch Hand
Posts: 148
Hey Guy's does any one understand what is the diffrence between Unidirectional and Bidirectional ??

Just say
ONE - ONE Bidirectional ? < ------ >
ONE - ONE Unidirectional ? --------->

Please help me I wan't to clear my doubts.

In My openion I didn't see any diffrence in coding. Is there any meaning. I feel (can see)it will useful for <cascade-delete/>

Tell me your Ideas
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:roll:

Dilip Gamage
Ranch Hand
Posts: 148
No one ??

Nathaniel Stoddard
Ranch Hand
Posts: 1258
Geez ... what's the difference between a bicycle and a unicycle? One has two wheels, one has one wheel. Bi = 2 and Uni = 1. Therefore, a bidirectional relationship must have two directions, easily labeled 'to' and 'from''. A unidirectional relationship likewise has one direction.

Dilip Gamage
Ranch Hand
Posts: 148
You mean it can't call back word ? But there was a question kathy she calls it back

X. Li
Ranch Hand
Posts: 61
ONE - ONE Bidirectional ? < ------ >
ONE - ONE Unidirectional ? --------->

Here is my understanding:
Suppose there are two beans A and B.
Bidirectional means: A can get B, and B can get A too;
In A: getB();
In B: getA();
Unidirectional means: A can get B, but B can't get A.
In A: getB();
In B: no method to get A.

Dilip Gamage
Ranch Hand
Posts: 148
yeh yeh thats the thing i want to know. But some occation they use it both way Thanks X.LI