Question

我想以编程方式启动HSQLdb服务器。我创建了一个类似于下面的runnable，然后在一个线程中启动它。

   Runnable hsqlRunnable = new Runnable() {
                public void run()
                {

                    HsqlProperties props = new HsqlProperties();
                    props.setProperty("server.database.0", "file:C:\Documents and Settings\BThirup\Application Data\Rockwell Automation\FactoryTalk ProductionCentre\logs\ApplicationLog\mydb;shutdown=true;");
                    props.setProperty("server.dbname.0", "xdb");
org.hsqldb.Server server = new org.hsqldb.Server();

                    try {
                        server.setProperties(props);
                    } catch (Exception e) {
                        return;
                    }

                    server.start();
}
}

我收到错误： [Thread [HSQLDB Server @ 4db602,6，main]]：由于没有打开的数据库而关闭

任何人都可以帮助指出我出错的地方。

感谢您的帮助巴拉

Answer 1

您可以使用单独的类来管理HSQLdb服务器实例：

public class DBManager {

final String dbLocation = "c:\\temp\\"; // change it to your db location
org.hsqldb.server.Server sonicServer;
Connection dbConn = null;

public void startDBServer() {
    HsqlProperties props = new HsqlProperties();
    props.setProperty("server.database.0", "file:" + dbLocation + "mydb;");
    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;
}
}

并将此类用作：

public class WFProcess extends Thread {

DBManager dbm = new DBManager();

public static void main(String[] args) {
    (new WFProcess()).start();
}

public void run() {
    dbm.startDBServer();

    // some usefull server work here
    Connection conn = dbm.getDBConn();
    try {
        Statement stmt = conn.createStatement();
        stmt.executeQuery("CREATE TABLE IF NOT EXISTS answers (num INT IDENTITY, answer VARCHAR(250))");
        stmt.executeQuery("INSERT INTO answers (answer) values ('this is a new answer')");
        ResultSet rs = stmt.executeQuery("SELECT num, answer FROM answers");
        while (rs.next()) {
            System.out.println("Answer number: " + rs.getString("num")
                    + "; answer text: " + rs.getString("answer"));
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    // end of usefull server work

    dbm.stopDBServer();
}
}

Answer 2

正如您所评论的那样，server.setTrace（true）有助于排除故障。 server.setSilent（false）也是如此。

但是你不应该创建并启动Runnable来启动服务器。 Server类完成所有这些并启动必要的线程。

Answer 3

对于HSQL 2.3.x，请参阅以下内容将HSQL作为WebServer运行（使用端口80进行网络的HSQL服务器。）

https://stackoverflow.com/a/37784679/15789

以编程方式启动hsqldb数据库

3 个答案: