公開分佈式高性能查詢的源代碼和部署方案.(二）

5）建立複雜的對象關聯，在Versant數據庫中也很是容易，能夠直接理解爲內存對象的操做。 public void createKnownPerson() { TransSession session = DistributedDatabaseManager.getInstance() .createNewSession(); session.setDefaultDatabase("dbnodeb"); Person personA = new Person(); personA.setFirstName("AAF1"); personA.setLastName("AAL1"); Person personB = new Person(); personB.setFirstName("BBF1"); personB.setLastName("BBL1"); personB.addFriend(personA); Person personC = new Person(); personC.setFirstName("CCF1"); personC.setLastName("CCL1"); personC.addFriend(personB); Person personD = new Person(); personD.setFirstName("DDF1"); personD.setLastName("DDL1"); personD.addFriend(personC); session.makePersistent(personA, "dbnodea"); session.makePersistent(personB, "dbnodeb"); session.makePersistent(personC, "dbnodea"); session.makePersistent(personD, "dbnodeb"); System.out.println("Special Test Data created."); session.commit(); } 6）Versant數據庫的對象查詢 Versant數據庫能夠支持SQL查詢和NOSQL查詢兩種模式，如下爲SQL查詢的例子： TransSession session = DistributedDatabaseManager.getInstance() .createNewSession(); VQLQuery q = new VQLQuery( session, DistributedDatabaseManager.getInstance().HPC_DEMO_NETWORK_NAME, "select selfoid from com.versant.domain.Person where firstName='AAF1' and lastName='AAL1'"); //"select * from com.versant.domain.Person"); System.out.println("About to execute query, and load root object."); VEnumeration results = q.execute(); // 建立已經走過的朋友路徑，避免迴環 System.out .println("--------------------------------------------------------------------------");