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)
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:
example: jdbc:derby://localhost:1527/dbname;create=true
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”。