Couchbase Server 是一個叢集化的、基於文檔的資料庫系統,網上有MongoDB與Couchbase的對比,請參考:
http://www.javaworld.com/javaworld/jw-03-2013/130321-mongodb-vs-couchbase-nosql.html
Couchbase首頁:http://www.couchbase.com/
本文的目標是搭建簡單的Couchbase環境並用Java語言進行讀寫測試。
1.準備工作
1)下載 Couchbase Server ,本文用到的版本是1.8.1 for win32 ,2.0在我的機器上裝不上,核心問題。
2)下載 Java相關類庫
2.安裝Couchbase Server
1)安裝詳細過程請參考:http://www.couchbase.com/docs/couchbase-manual-2.0/couchbase-getting-started-install-win.html
2)安裝完成後Couchbase Console程式會自動開啟http://localhost:8091地址,這時候有可能會打不開,最有可能出現的問題就是連接埠被佔用了。
Couchbase預設連接埠是:8091,運行如下命令排查:
netstat -ano|findstr "8091"TCP 127.0.0.1:9050 0.0.0.0:0 LISTENING 1751
連接埠被進程號為1751的進程佔用,繼續執行下面命令:
tasklist|findstr "1751"spool.exe 1751 Console 0 16,064 K
開啟工作管理員根據進程ID結束掉相應程式。這時開啟Couchbase安裝目標下的server/bin目錄,形如:D:\Program Files\Couchbase\Server\bin執行service_start.bat批處理命令後,在服務裡檢查CouchbaseServer服務是否啟動。
這時再開啟http://localhost:8091就能自動CouchServer 的webconsole安裝頁面了,參考:http://www.couchbase.com/docs/couchbase-manual-2.0/couchbase-getting-started-setup.html進行安裝配置。
3.編寫例子進行測試用eclipse或其它IDE建立Project,匯入之前下載的Couchbase-Java-Client-1.1.4.zip中的所有jar包。
建立寫入測試類別:
import java.io.IOException;import java.net.URI;import java.util.LinkedList;import java.util.List;import java.util.concurrent.ExecutionException;import java.util.concurrent.TimeUnit;import net.spy.memcached.internal.OperationFuture;import com.couchbase.client.CouchbaseClient;public class Main { //文檔key public static final String KEY = "beer_Wrath"; // expiration time of the document (use 0 to persist forever) //到期時間(單位毫秒 0 永久) public static final int EXP_TIME = 0; //文檔值 public static final String VALUE = "{\"name\":\"Wrath\",\"abv\":9.0," + "\"type\":\"beer\",\"brewery_id\":\"110f1a10e7\"," + "\"updated\":\"2010-07-22 20:00:20\"," + "\"description\":\"WRATH Belgian-style \"," + "\"style\":\"Other Belgian-Style Ales\"," + "\"category\":\"Belgian and French Ale\"}"; public static void main(String args[]) { List<URI> uris = new LinkedList<URI>(); //伺服器位址(可在Couchbase後台Server NODES中查看) uris.add(URI.create("http://192.168.10.15:8091/pools")); CouchbaseClient client = null; try { //在Couchbase背景Data Buckets中查看 client = new CouchbaseClient(uris, "default", ""); } catch (IOException e) { System.err.println("IOException connecting to Couchbase: " + e.getMessage()); System.exit(1); } OperationFuture<Boolean> setOp = client.set(KEY, EXP_TIME, VALUE); //檢查是否設定成功 try { if (setOp.get().booleanValue()) { System.out.println("Set Succeeded"); } else { System.err.println("Set failed: " + setOp.getStatus().getMessage()); } } catch (InterruptedException e) { System.err.println("InterruptedException while doing set: " + e.getMessage()); } catch (ExecutionException e) { System.err.println("ExecutionException while doing set: " + e.getMessage()); } System.out.println(); //完成操作後3秒後關閉client client.shutdown(3, TimeUnit.SECONDS); System.exit(0); }}
運行後看到Set Succeeded字樣表示設定成功。編寫測試類別進行讀取:
import java.io.IOException;import java.net.URI;import java.util.LinkedList;import java.util.List;import java.util.concurrent.TimeUnit;import com.couchbase.client.CouchbaseClient;public class Client{public static void main(String[] args){ List<URI> uris = new LinkedList<URI>(); uris.add(URI.create("http://192.168.10.15:8091/pools")); CouchbaseClient client = null; try { client = new CouchbaseClient(uris, "default", ""); } catch (IOException e) { System.err.println("IOException connecting to Couchbase: " + e.getMessage()); System.exit(1); } Object o = client.get("beer_Wrath"); System.out.println(o); client.shutdown(3, TimeUnit.SECONDS); System.exit(0);}}
由於寫入例子中設定的時間是永久,所以這裡正確的輸出應該是:
{"name":"Wrath","abv":9.0,"type":"beer","brewery_id":"110f1a10e7","updated":"2010-07-22 20:00:20","description":"WRATH Belgian-style ","style":"Other Belgian-Style Ales","category":"Belgian and French Ale"}
我們還能在Couchbase webconsole背景Data buckets中查看到我們剛才設定的key.