程序在 psql delete 语句后卡住

Question

我的程序使用 ssh (ssh.net) 连接到主机，使用数据提供程序 npgsql 连接到 psql 数据库并删除具有给定 ID 的条目。

它按原样删除了条目，但程序在此之后至少卡住了 1 分钟。使用 using 语句，我认为在 sql 命令之后连接应该已经断开，但我也没有收到为什么需要这么长时间的错误。

有什么事情我忘记了，必须等待超时吗？

SshClient client = new SshClient(host, username, password);

尝试
    {
        //SSH连接
        client.Connect();
        如果（client.IsConnected）
        {
            scrLog.Content += "SSH connection successfull";
            scrLog.Content += Environment.NewLine;
        }
        别的
        {
            scrLog.Content += "SSH connection failed";
            scrLog.Content += Environment.NewLine;
        }

    //Portforwarding to Port 5432 (postgresql)
    var portFwdL = new ForwardedPortLocal(psqlBoundHost, psqlUPort, psqlHost, psqlUPort);
    client.AddForwardedPort(portFwdL);
    portFwdL.Start();
    if (portFwdL.IsStarted)
    {
        scrLog.Content += "Portforwarding started";
        scrLog.Content += Environment.NewLine;
    }
    else
    {
        scrLog.Content += "Portforwarding failed";
        scrLog.Content += Environment.NewLine;
    }

    //Connection to Database with a Delete Command
    try
    {
        string connstring = String.Format("Server={0};Port={1};" +
        "User Id={2};Password={3};Database={4}",
        psqlBoundHost, psqlPort, sqluser, sqlpass, database);

        using (NpgsqlConnection conn = new NpgsqlConnection(connstring))
        {
            conn.Open();

            string sql1 = "delete from tblTest where testId = '" + nr + "';";
            //string sql2 = "\q";

            NpgsqlCommand cmd1 = new NpgsqlCommand(sql1, conn);
            cmd1.ExecuteNonQuery();
            scrLog.Content += sql1;
            scrLog.Content += Environment.NewLine;

            //NpgsqlCommand cmd2 = new NpgsqlCommand(sql2, conn);
            //cmd2.ExecuteNonQuery();
            //scrLog.Content += sql2;
            //scrLog.Content += Environment.NewLine;
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show("Error with the psql-connection:"
            + Environment.NewLine
            + ex.Message);
    }

    client.Disconnect();
    scrLog.Content += "SSH connection closed";
    scrLog.Content += Environment.NewLine;
}
catch (Exception ex)
{
    MessageBox.Show("Error with the ssh-connection:"
        + Environment.NewLine
        + ex.Message);
}

我尝试使用

\q

命令最后，但它总是给我错误“42601：“\”处或附近的语法错误”，我读到它不需要。

有人可以帮忙吗？

Answer 1

经过研究和测试不同的场景，我终于找到了超时。我需要禁用连接池，如果再次需要，连接在关闭后仍处于打开状态。我只是用 Pooling=false.

禁用了它

string sqlpool = "false";
string sqlconn = String.Format("Server={0};Port={1};User Id={2};Password={3};Database={4};Pooling={5};",
                    sqlserver, sqlport, sqluserid, sqlpass, sqldatabase, sqlpool);

程序在 psql delete 语句后卡住

program get stuck after psql delete statement

c#

postgresql

ssh

sql-delete