Java 未找到适合jdbc:hsqldb:file:\dir\to\db的驱动程序

我想在我的Vaadin项目中使用HSQLDB，但它就是不起作用。我的连接代码如下所示：

package ml.uniwide.ufin.spring;
import java.sql.*;

public class MySQL { // I know that I use HSQLDB not MySQL...
    public boolean auth(String username, String password) {
        Connection conn = null;
        try {
              Class.forName( "org.hsqldb.jdbcDriver" );
            }
            catch ( ClassNotFoundException e ) {
              System.err.println( "no driver found" );
            }
        String url = "jdbc:hsqldb:file:D:\\Dokumente\\UNIWIDEDatabase";
        try {
            Connection con = DriverManager.getConnection( url, "user", "pw" );

            Statement stmt = con.createStatement();
            String selectUserName = "SELECT * FROM \"PUBLIC\".\"USERS\" WHERE USERNAME = '" + username + "' AND PASSWORDHASH = '" + password + "'";
            ResultSet result = stmt.executeQuery(selectUserName);
            int count = 0;
            while(result.next()) {
                count++;
            }
            if(count<1) {
                return false;
            } else {
                return true;
            }
        } catch (SQLException e) {
            e.printStackTrace();
            return false;
        }
    }
}

有人知道这个问题的解决办法吗？

---

非常感谢

您启动了HSQLDB服务了吗？在建立任何连接之前，需要通过其管理器工具或通过以下代码以编程方式启动：

public class DBManager {

final String dbLocation = "D:\\Dokumente\\UNIWIDEDatabase"; // change it to your db location
org.hsqldb.Server sonicServer;
Connection dbConn = null;

public static void main(String[] args) {
    DBManager manager = new DBManager();
    manager.startDBServer();
}

public void startDBServer() {
    HsqlProperties props = new HsqlProperties();
    props.setProperty("server.database.0", "file:" + dbLocation + ";");
    props.setProperty("server.dbname.0", "xdb");
    sonicServer = new org.hsqldb.Server();
    try {
        sonicServer.setProperties(props);
    } catch (Exception e) {
        return;
    }
    sonicServer.start();
}

public void stopDBServer() {
    sonicServer.shutdown();
}

public Connection getDBConn() {
    try {
        Class.forName("org.hsqldb.jdbcDriver");
        dbConn = DriverManager.getConnection(
                "jdbc:hsqldb:hsql://localhost/xdb", "SA", "");
    } catch (Exception e) {
        e.printStackTrace();
    }
    return dbConn;
}

}

---

然后，您要连接的URL将是jdbc:hsqldb:hsql://localhost/xdb“

一个错误指示无法从类路径中找到类。在Maven中指定下载依赖项之后，您是否安装了下载依赖项？

no driver found
java.sql.SQLException: No suitable driver found for jdbc:hsqldb:file:D:\Dokumente\UNIWIDEDatabase

public class DBManager {

final String dbLocation = "D:\\Dokumente\\UNIWIDEDatabase"; // change it to your db location
org.hsqldb.Server sonicServer;
Connection dbConn = null;

public static void main(String[] args) {
    DBManager manager = new DBManager();
    manager.startDBServer();
}

public void startDBServer() {
    HsqlProperties props = new HsqlProperties();
    props.setProperty("server.database.0", "file:" + dbLocation + ";");
    props.setProperty("server.dbname.0", "xdb");
    sonicServer = new org.hsqldb.Server();
    try {
        sonicServer.setProperties(props);
    } catch (Exception e) {
        return;
    }
    sonicServer.start();
}

public void stopDBServer() {
    sonicServer.shutdown();
}

public Connection getDBConn() {
    try {
        Class.forName("org.hsqldb.jdbcDriver");
        dbConn = DriverManager.getConnection(
                "jdbc:hsqldb:hsql://localhost/xdb", "SA", "");
    } catch (Exception e) {
        e.printStackTrace();
    }
    return dbConn;
}