Re: [eclipselink-users] How to add restrictions dinamically to criteriaB

[Gordon Yorke <gordon.yorke@xxxxxxxxxx>]

The key to creating a dynamic restriction is to build the restriction 
first then add it as a whole to the CriteriaQuery.  Your code should be 
changed to look as follows.

Predicate restriction = qb.conjunction(); // assume starting with True.
if (a) {
  restriction = qb.and(restriction, qb.equal(X, Y));
}
if (b) {
  restriction = qb.and(restriction, qb.equal(Z, C));
}

criteriaQuery.where(restriction);

--Gordon

Diego Coronel wrote:
> Hi,
>
>  Im trying to dinamic add restrictions to criteria, but i dont know how to
> do it.. all samples in jpa-reference just always add it on
> criteriaQuery.where(xxxx,yyy,zzz);
>
>  Can you tell me how to do something like:
>
>  if ( a ) {
>   criteriaQuery.addRestriction( qb.equal( X, Y ) );
> }
>
>  if ( b ) {
>   criteriaQuery.addRestriction( qb.equal( Z, C ) );
> }
>
> i wanna to construct my query restrictions in runtime. just adding it when
> necessary.
>
> ... sry about english.
>