無法連接到嵌入式Derby數據庫

Question

我正在開發將Java Embedded DB集成到NetBeans 7.2 IDE中的Java桌面應用程序。該數據庫是使用IDE創建的，目前它與前端是分開的。 現在，我想將數據庫連接到前端。 當我嘗試時，它給我一個服務器未找到錯誤。 以下是代碼段。

 static final String host   = "jdbc:derby:Wa_Poly";
 static final String uName  = "chief";
 static final String uPass  = "12345";    

連接的代碼是：

    /* Connecting to the database */
    Connection  con = DriverManager.getConnection(host, uName, uPass);
    Statement stmt2 = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,  
    ResultSet.CONCUR_UPDATABLE);
    String sql = "SELECT * FROM APP.ALUMNUS";
    ResultSet rs = stmt2.executeQuery(sql); 
    populateIndex(rs, Scrollable);

這是給出的錯誤：

Jul 17, 2014 2:40:40 PM SearchEngine.SearchDB searchDatabase
SEVERE: null
java.sql.SQLException: Database 'Wa_Poly' not found.
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.newSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.handleDBNotFound(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.<init>(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection30.<init>(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection40.<init>(Unknown Source)
at org.apache.derby.jdbc.Driver40.getNewEmbedConnection(Unknown Source)
at org.apache.derby.jdbc.InternalDriver.connect(Unknown Source)
at org.apache.derby.jdbc.AutoloadedDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:579)
at java.sql.DriverManager.getConnection(DriverManager.java:221)
at SearchEngine.Index.buildIndex(Index.java:118)
at SearchEngine.SearchDB.searchDatabase(SearchDB.java:96)
at wa_poly.MyJFrame.<init>(MyJFrame.java:47)
at wa_poly.MyJFrame$5.run(MyJFrame.java:292)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:721)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:682)
at java.awt.EventQueue$3.run(EventQueue.java:680)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:691)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)

Caused by: java.sql.SQLException: Database 'Wa_Poly' not found.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown 

來源）...還有32個

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at SearchEngine.SearchDB.searchDatabase(SearchDB.java:105)
at wa_poly.MyJFrame.<init>(MyJFrame.java:47)
at wa_poly.MyJFrame$5.run(MyJFrame.java:292)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:721)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:682)
at java.awt.EventQueue$3.run(EventQueue.java:680)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:691)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)

任何解決問題的想法都值得歡迎。

Answer 1

這還不夠：

JDBC：德比：Wa_Poly

嵌入式連接必須類似於

jdbc：derby：C：/ Dokumente und Einstellungen / Administrator / .netbeans-derby / Wa_Poly

在這里看看我的答案
嵌入式Derby

編輯

右鍵單擊服務-> JavaDB->創建數據庫

看你的數據庫文件夾在哪里。