Sequoiadb 測試體驗系列之五 – Java 開發2

上一篇筆記中主要嘗試了一下SequoiaDB 的 Sequoiadb，CollectionSpace，DBCollection 這幾個類給出的基本接口。實現了數據庫實例的創建，集合空間的創建，查詢，集合的創建，數據的插入，和數據集的插入等一系列操作。這次嘗試一下在集合中的刪除，更新，查詢等操作。

前半部分代碼是將上次的代碼稍作了修改，實現的功能還是一樣，連接database，創建collection space，創建collection，插入兩種格式的6條記錄。

<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>

運行代碼，程序的輸出爲：

The CS test_cs is created
Collection Space: test_cs
The Collection test_cl is created
There are 0 record(s) in the collection
Inserting one record...
There are 1 record(s) in the collection
Inserting 5 records...
There are 6 record(s) in the collection
Deleting one record...
There are 5 record(s) in the collection
Deleting 5 records...
There are 0 record(s) in the collection
Inserting 6 records again...
There are 6 record(s) in the collection
Querying  all records with the value of 'Id' from 0 to 8...
Query Results:
Record with Id from 0 to 8:0
Record with Id from 0 to 8:1
Record with Id from 0 to 8:2
Record with Id from 0 to 8:3
Record with Id from 0 to 8:4
There are 5 records in the result set
Updateing 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，上面的代碼先是創建了一個名爲test_cs的集合空間，一個名爲test_cl的集合，並分兩次在集合中分別插入了1條和5條記錄，總共6條記錄。

之後刪除了包含“Name“域的值爲”foo“的一條記錄。

然後又刪除了”Id“域的值爲0-8的5條記錄。

此時，集合裏所有的記錄都被刪除。

所以又分兩次重新插入了6條記錄。

查詢所有”Id“域的值爲0-8的記錄，返回5條記錄，Id的值分別爲0,1,2,3,4

將所有”Id”的值增加10，增加後的Id的值應爲10,11,12,13,14

再次查詢所有”Id“域的值爲0-8的記錄，返回0條記錄。