Sequoiadb 测试体验系列之五 – Java 开发2

上一篇笔记中主要尝试了一下SequoiaDB 的 Sequoiadb，CollectionSpace，DBCollection 这几个类给出的基本接口。实现了数据库实例的创建，集合空间的创建，查询，集合的创建，数据的插入，和数据集的插入等一系列操作。这次尝试一下在集合中的删除，更新，查询等操作。

前半部分代码是将上次的代码稍作了修改，实现的功能还是一样，连接database，创建collection space，创建collection，插入两种格式的6条记录。

<span style="font-size:18px;">import java.util.ArrayList;import java.util.List;import org.bson.BSONObject;import org.bson.BasicBSONObject;import com.sequoiadb.base.CollectionSpace;import com.sequoiadb.base.DBCollection;import com.sequoiadb.base.DBCursor;import com.sequoiadb.base.Sequoiadb;import com.sequoiadb.exception.BaseException;public class BlogCollectionSpace {static String CS_NAME = "test_cs";static String CL_NAME = "test_cl";public static void main(String[] args) {String host = "192.168.20.46";String port = "11810";String usr = "admin";String password = "admin";Sequoiadb sdb = null;try {sdb = new Sequoiadb(host + ":" + port, usr, password);} catch (BaseException e) {e.printStackTrace();System.exit(1);}if (sdb.isCollectionSpaceExist(CS_NAME)) {sdb.dropCollectionSpace(CS_NAME);}CollectionSpace cs = sdb.createCollectionSpace(CS_NAME);if (sdb.isCollectionSpaceExist(CS_NAME) && cs.getName() == CS_NAME) {System.out.println("The CS " + CS_NAME + " is created");} else {System.exit(2);}DBCursor CSList = sdb.listCollectionSpaces();while (CSList.hasNext()) {String name = (String) CSList.getNext().get("Name");System.out.println("Collection Space: " + name);}if (cs.isCollectionExist(CL_NAME)) {cs.dropCollection(CL_NAME);}DBCollection cl = cs.createCollection(CL_NAME);if (cs.isCollectionExist(CL_NAME) && cl.getName() == CL_NAME) {System.out.println("The Collection " + CL_NAME + " is created");} else {System.exit(3);}System.out.println("There are " + cl.getCount() + " record(s) in the collection");System.out.println("Inserting one record...");insertOneRecord(cl);System.out.println("There are " + cl.getCount() + " record(s) in the collection");System.out.println("Inserting 5 records...");insertSomeRecords(cl);System.out.println("There are " + cl.getCount() + " record(s) in the collection");System.out.println("Deleting one record...");deleteOneRecord(cl);System.out.println("There are " + cl.getCount() + " record(s) in the collection");System.out.println("Deleting 5 records...");deleteSomeRecords(cl);System.out.println("There are " + cl.getCount() + " record(s) in the collection");System.out.println("Inserting 6 records again...");insertOneRecord(cl);insertSomeRecords(cl);System.out.println("There are " + cl.getCount() + " record(s) in the collection");System.out.println("Querying  all records with the value of 'Id' from 0 to 8...");queryId(cl);System.out.println("Updateing all the records, add 10 to all the 'Id'...");updateId(cl);System.out.println("Querying  all records with the value of 'Id' from 0 to 8...");queryId(cl);}static private void insertOneRecord(DBCollection cl){BSONObject insertor = null;insertor = new BasicBSONObject();BSONObject phone = new BasicBSONObject();insertor.put("Name", "foo");insertor.put("Age", 10);phone.put("home", "123456789");phone.put("mobile", "987654321");insertor.put("Phone", phone);cl.insert(insertor);}static private void insertSomeRecords(DBCollection cl) {List<BSONObject> list = null;try {list = new ArrayList<BSONObject>(5);for (int i = 0; i < 5; i++) {BSONObject obj = new BasicBSONObject();BSONObject addressObj = new BasicBSONObject();BSONObject phoneObj = new BasicBSONObject();addressObj.put("city", "foo");addressObj.put("province", "bar");phoneObj.put("Type", "Office");phoneObj.put("Number", "88888888");obj.put("name", "test");obj.put("Id", i);obj.put("Phonenumber", phoneObj);obj.put("Address", addressObj);list.add(obj);}} catch (Exception e) {System.out.println("Failed to create name list record.");e.printStackTrace();}cl.bulkInsert(list, 1);}static private void deleteOneRecord(DBCollection cl) {BSONObject matcher = new BasicBSONObject();matcher.put("Name","foo");cl.delete(matcher);}static private void deleteSomeRecords(DBCollection cl) {BSONObject matcher = new BasicBSONObject();matcher.put("name", "test");cl.delete(matcher);}static private void queryId(DBCollection cl) {BSONObject matcher = new BasicBSONObject();BSONObject condition = new BasicBSONObject();condition.put("$gte", 0);condition.put("$lte", 8);matcher.put("Id",condition);DBCursor records = cl.query(matcher,null,null,null);System.out.println("Query Results:");int count = 0;while(records.hasNext()){count++;BSONObject record = records.getNext();System.out.println("Record with Id from 0 to 8:" + record.get("Id").toString());}System.out.println("There are " + count + " records in the result set");}static private void updateId(DBCollection cl) {BSONObject matcher = new BasicBSONObject();BSONObject modifier = new BasicBSONObject();BSONObject condition = new BasicBSONObject();BSONObject operation = new BasicBSONObject();condition.put("$gte", 0);condition.put("$lte", 8);matcher.put("Id",condition);operation.put("Id",10);modifier.put("$inc", operation);cl.update(matcher,modifier,null);}}</span>

运行代码，程序的输出为：

The CS test_cs is createdCollection Space: test_csThe Collection test_cl is createdThere are 0 record(s) in the collectionInserting one record...There are 1 record(s) in the collectionInserting 5 records...There are 6 record(s) in the collectionDeleting one record...There are 5 record(s) in the collectionDeleting 5 records...There are 0 record(s) in the collectionInserting 6 records again...There are 6 record(s) in the collectionQuerying  all records with the value of 'Id' from 0 to 8...Query Results:Record with Id from 0 to 8:0Record with Id from 0 to 8:1Record with Id from 0 to 8:2Record with Id from 0 to 8:3Record with Id from 0 to 8:4There are 5 records in the result setUpdateing all the records, add 10 to all the 'Id'...Querying  all records with the value of 'Id' from 0 to 8...Query Results:There are 0 records in the result set

可以看出，上面的代码先是创建了一个名为test_cs的集合空间，一个名为test_cl的集合，并分两次在集合中分别插入了1条和5条记录，总共6条记录。

之后删除了包含“Name“域的值为”foo“的一条记录。

然后又删除了”Id“域的值为0-8的5条记录。

此时，集合里所有的记录都被删除。

所以又分两次重新插入了6条记录。

查询所有”Id“域的值为0-8的记录，返回5条记录，Id的值分别为0,1,2,3,4

将所有”Id”的值增加10，增加后的Id的值应为10,11,12,13,14

再次查询所有”Id“域的值为0-8的记录，返回0条记录。