How to implement referential integrity and cascading actions in liferay service xml file? -

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i have requirement need implement ondelete cascade functionality liferay service builder. how can achieve in liferay?

first of all:

ondelete cascade not liferay service builder functionality. funtionality provided database.

next: liferay has premise, data processing , evaluation should done in code, , not in database.

having said that:

something similar ondelete cascade implement model listener. modellistener listening changes of model. (i know, misleading name ;) ) in model listener, implement onafterremove. in onafterremove goes code deletion of related records.

here small sample have written. code listening changes of group object, , tries delete referenced objectgeodata object, if there 1 present. 

package de.osc.geodata.modellistener;  import com.liferay.portal.modellistenerexception; import com.liferay.portal.kernel.exception.portalexception; import com.liferay.portal.kernel.exception.systemexception; import com.liferay.portal.kernel.log.log; import com.liferay.portal.kernel.log.logfactoryutil; import com.liferay.portal.kernel.search.indexerregistryutil; import com.liferay.portal.kernel.search.searchexception; import com.liferay.portal.model.basemodellistener; import com.liferay.portal.model.group; import com.liferay.portal.service.servicecontext;  import de.osc.geodata.model.objectgeodata; import de.osc.geodata.service.objectgeodatalocalserviceutil;  public class groupmodellistener extends basemodellistener<group> {      private static final log log = logfactoryutil.getlog(groupmodellistener.class);       @override     public void onafterremove(group model) throws modellistenerexception {         try {             objectgeodata objectgeodata = objectgeodatalocalserviceutil.getobjectgeodata(model.getclassnameid(), model.getclasspk());             if (objectgeodata != null) {                 objectgeodatalocalserviceutil.deleteobjectgeodata(objectgeodata);             }         } catch (systemexception e) {             log.warn("no geodataobject found in index.", e);         }          super.onafterremove(model);     }  }

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