Sequoiadb 測試體驗系列之四 – Java 開發

上一篇中嘗試了一下SequoiaDB的 shell控制檯的使用，研究了一下控制檯中匹配符、更新符和聚集符的使用。今天嘗試一下SequoiaDB官方提供的Java 驅動。

首先要從官方下載驅動程序，按照http://www.sequoiadb.com/document/1.8/developement/application/java/topics/java.html給出的信息搭建開發環境，也就是將jar包加入到工程中。

今天主要嘗試了一下Sequoiadb，CollectionSpace，DBCollection（爲毛CollectionSpace類名字前面就不加DB...）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。完整代碼如下：

<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;

        //創建數據庫實例
        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);
        }

        //創建集合空間
        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);
        }

        //查詢數據庫中的集合空間
        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);
        }

        //創建集合
        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("Before inserting one record");
        System.out.println("There are " + cl.getCount() + " record(s) in the collection");

        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);

        //插入包含記錄的BSONObject
        cl.insert(insertor);
        System.out.println("After inserting one record");
        System.out.println("There are " + cl.getCount() + " record(s) in the collection");


        System.out.println("Before inserting 5 records");
        System.out.println("There are " + cl.getCount() + " record(s) in the collection");


        List<BSONObject> list = null;

        //創建一個包含五條記錄的數據集
        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();
        }

        //在集合中插入數據集
        cl.bulkInsert(list, 1);

        System.out.println("After inserting 5 record");
        System.out.println("There are " + cl.getCount() + " record(s) in the collection");
    }
}
</span>

在運行上面的代碼前，通過控制檯shell查看一下數據庫的狀態：

<span style="font-size:18px;">> db.listCollectionSpaces()
Return 0 row(s).
Takes 0.1100s.
> db.listCollections()
Return 0 row(s).
Takes 0.1139s.</span>

可以看出這是一個空數據庫，沒有任何集合空間和集合。運行代碼，程序的輸出爲：

<span style="font-size:18px;">The CS test_csis created
Collection Space: test_cs
The Collection test_cl is created
Before inserting one record
There are 0 record(s) in the collection
After inserting one record
There are 1 record(s) in the collection
Before inserting 5 records
There are 1 record(s) in the collection
After inserting 5 record
There are 6 record(s) in the collection
</span>

可以看出，上面的代碼在空數據庫中創建了一個名爲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。

最後，利用控制檯shell查詢一下數據庫的情況：

<span style="font-size:18px;">> db.listCollectionSpaces()
{
  "Name": "test_cs"
}
Return 1 row(s).
Takes 0.1291s.
> db.listCollections()
{
  "Name": "test_cs.test_cl"
}
Return 1 row(s).
Takes 0.1441s.
> testcs = db.getCS("test_cs")
localhost:11810.test_cs
Takes 0.1385s.
> testcl = testcs.getCL("test_cl")
localhost:11810.test_cs.test_cl
Takes 0.8262s.
> testcl.find()
{
  "_id": {
    "$oid": "53c621d0c5d00bea55f5a959"
  },
  "Age": 10,
  "Name": "foo",
  "Phone": {
    "home": "123456789",
    "mobile": "987654321"
  }
}
{
  "_id": {
    "$oid": "53c621939c74ef081d3e7d83"
  },
  "Address": {
    "city": "foo",
    "province": "bar"
  },
  "Id": 3,
  "Phonenumber": {
    "Number": "88888888",
    "Type": "Office"
  },
  "name": "test"
}
{
  "_id": {
    "$oid": "53c621939c74ef081d3e7d81"
  },
  "Address": {
    "city": "foo",
    "province": "bar"
  },
  "Id": 1,
  "Phonenumber": {
    "Number": "88888888",
    "Type": "Office"
  },
  "name": "test"
}
{
  "_id": {
    "$oid": "53c621939c74ef081d3e7d84"
  },
  "Address": {
    "city": "foo",
    "province": "bar"
  },
  "Id": 4,
  "Phonenumber": {
    "Number": "88888888",
    "Type": "Office"
  },
  "name": "test"
}
{
  "_id": {
    "$oid": "53c621939c74ef081d3e7d82"
  },
  "Address": {
    "city": "foo",
    "province": "bar"
  },
  "Id": 2,
  "Phonenumber": {
    "Number": "88888888",
    "Type": "Office"
  },
  "name": "test"
}
{
  "_id": {
    "$oid": "53c621939c74ef081d3e7d80"
  },
  "Address": {
    "city": "foo",
    "province": "bar"
  },
  "Id": 0,
  "Phonenumber": {
    "Number": "88888888",
    "Type": "Office"
  },
  "name": "test"
}
Return 6 row(s).
Takes 0.3921s.</span>

現在的數據空中有了剛剛插入的test_cs集合空間，test_cl集合，和剛剛分兩次插入的6條數據。