void testCascadeTran()
{
	char jsonResult[1024];
 
	DniproDB* db = new DniproDB();
	db->init();
 
	uint docID;
 
	{//LEVEL 1 ===============================================================
	 //tran level 1
		uint tranLevel1 = db->beginTran(READ_COMMITED_TRAN);
 
		//add doc with one attribute, level 1
		docID = db->addDoc("{'attr1':'lev1'}", tranLevel1);
 
		{//LEVEL 2 ==============================================================
		 //tran level 2
			uint tranLevel2 = db->beginTran(READ_COMMITED_TRAN, tranLevel1);
 
			//add to doc one new attribute
			db->insPartDoc("{'attr2':'lev2'}", docID, tranLevel2);
 
			//in doc 2 attributes {'attr1':'Lev1', 'attr2':'Lev2'}
			db->getPartDoc("{'attr1':$, 'attr2':$, 'attr3':$}", jsonResult, docID, tranLevel2);
 
			{//LEVEL 3 ==============================================================
			 //tran level 3
				uint tranLevel3 = db->beginTran(READ_COMMITED_TRAN, tranLevel2);
 
				//add to doc next attribute
				db->insPartDoc("{'attr3':'lev3'}", docID, tranLevel3);
 
				//in doc 3 attributes {'attr1':'Lev1', 'attr2':'Lev2', 'attr3':'Lev3'}
				db->getPartDoc("{'attr1':$, 'attr2':$, 'attr3':$}", jsonResult, docID, tranLevel2);
 
				db->commitTran(tranLevel3);
			}//=====================================================================
 
			 //in doc 3 attributes {'attr1':'Lev1', 'attr2':'Lev2', 'attr3':'Lev3'}
			db->getPartDoc("{'attr1':$, 'attr2':$, 'attr3':$}", jsonResult, docID, tranLevel2);
 
			db->rollbackTran(tranLevel2);
		}//=====================================================================
 
		 //in doc 1 attribute {'attr1':'Lev1'}, other two were rollbacked
		db->getPartDoc("{'attr1':$, 'attr2':$, 'attr3':$}", jsonResult, docID, tranLevel1);
 
		//outrside tran document found nothing
		db->getPartDoc("{'attr1':$, 'attr2':$, 'attr3':$}", jsonResult, docID, 0);
 
		//commit tran level 1
		db->commitTran(tranLevel1);
 
	}//=====================================================================
 
	 //in doc 1 attribute {'attr1':'Lev1'}
	db->getPartDoc("{'attr1':$, 'attr2':$, 'attr3':$}", jsonResult, docID, 0);
}

public ActionResult send(Article a)
{
    a.Validate();

    a.ID = db.GetAll().Count() + 1;

{'type':'config', 'confVal1':'value', 'confVal2':'value', 'confVal3':'value', 'confVal4':'value' }