连接到Derby网络服务器时找不到数据库错误

时间:2013-06-29 00:30:03

标签: java jdbc javafx derby javadb

我在初始化javadb网络服务器并设置连接时遇到问题。这是一个JavaFX程序。

这是我到目前为止所做的:

try {
        Class.forName("org.apache.derby.jdbc.ClientDriver").newInstance();
        javadbserver = new NetworkServerControl();
        javadbserver.start(null);
    } catch (ClassNotFoundException e) {
        Logger.getLogger(MainGuiController.class.getName()).log(Level.SEVERE, null, ex);
        System.out.println("Where is your JavaDB embedded Driver?");
        return;
    }

    String dbName = "mydb";
    String dbUser = "auser";
    String dbPass = "password";

    PreparedStatement prepstmt;

    try {
        this.conn = DriverManager.getConnection("jdbc:derby://localhost:1527/mydb;user=auser;password=password");
        System.out.println("Went through!");
    } catch (SQLException ex) {
        Logger.getLogger(MainGuiController.class.getName()).log(Level.SEVERE, null, ex);
    }

我总是抓住第二个例外。

如果我右键单击netbeans中的javadb服务并选择connect,一切运行顺利。 [实际上,当我选择那个时,知道java在后台运行的代码或程序是很好的]

在库下的项目列表中,我看到了derby.jar,derbyclient.jar和derbynet.jar

我做错了什么?请帮忙!

这是我得到的错误

java.sql.SQLNonTransientConnectionException: The connection was refused because the database mydb was not found.
    at org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(Unknown Source)
    at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source)
    at org.apache.derby.jdbc.ClientDriver.connect(Unknown Source)
    at java.sql.DriverManager.getConnection(DriverManager.java:579)
    at java.sql.DriverManager.getConnection(DriverManager.java:243)
    at mydb.MainGuiController.initialize(MainGuiController.java:105)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2152)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2028)
    at mydb.mydb.start(mydb.java:37)
    at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:319)
    at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:215)
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:179)
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:176)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:176)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
    at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73)
    at java.lang.Thread.run(Thread.java:722)
Caused by: org.apache.derby.client.am.DisconnectException: The connection was refused because the database mydb was not found.
    at org.apache.derby.client.net.NetConnectionReply.parseRDBNFNRM(Unknown Source)
    at org.apache.derby.client.net.NetConnectionReply.parseAccessRdbError(Unknown Source)
    at org.apache.derby.client.net.NetConnectionReply.parseACCRDBreply(Unknown Source)
    at org.apache.derby.client.net.NetConnectionReply.readAccessDatabase(Unknown Source)
    at org.apache.derby.client.net.NetConnection.readSecurityCheckAndAccessRdb(Unknown Source)
    at org.apache.derby.client.net.NetConnection.flowSecurityCheckAndAccessRdb(Unknown Source)
    at org.apache.derby.client.net.NetConnection.flowUSRIDPWDconnect(Unknown Source)
    at org.apache.derby.client.net.NetConnection.flowConnect(Unknown Source)
    at org.apache.derby.client.net.NetConnection.<init>(Unknown Source)
    at org.apache.derby.client.net.NetConnection40.<init>(Unknown Source)
    at org.apache.derby.client.net.ClientJDBCObjectFactoryImpl40.newNetConnection(Unknown Source)

2 个答案:

答案 0 :(得分:8)

通过JDBC url,看起来你正在尝试连接到Derby服务器而不是嵌入式实例。如果您尝试连接到服务器实例,请注意以下几点:

  • 你自己启动了服务器,mydb已经存在吗?
  • 如果没有,你是否传递了正确的参数来创建(例如; create = true) example: jdbc:derby://localhost:1527/dbname;create=true
  • 如果mydb确实存在,您是否将服务器指向正确的位置?
    • 另外,根据用于启动derby的内容(例如嵌入式vs网络驱动程序),默认数据库位置也不同。您可以阅读about it here

基本上你得到的例外是Derby说它无法找到你的数据库 - 它基本上是一个路径问题。

答案 1 :(得分:2)

如果您正在使用netbeans,则应通过进入连接属性并添加属性来解决此问题。在“property”下输入“create”,在“value”下输入“true”。