Question

我正在创建一个C＃服务器，它打开一个命名管道并收集客户端发送给它的数据。基本上，我使用.NET MySql Connector和MySqlConnection类将收集的信息存储在mysql数据库中。我还添加了一个回退规则，如果数据库不可及，则缓存客户端在SQL文件中发送的信息，并在再次可用时将其导入数据库。一切正常，除非数据库完全消失（例如，当运行数据库的服务器因为崩溃而不再在网络上时），Connect（）方法将永远抛出异常。这是不可接受的，因为客户端发送了大量数据。有没有什么办法解决这一问题？如果查询失败，因为表不存在或类似，则会立即返回错误。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using log4net;
using MySql.Data.MySqlClient;

namespace PipeServer
{
    class MySqlConnector
    {
        //register logger
        private static readonly ILog log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        public delegate void MessageReceivedHandler(string message);
        public event MessageReceivedHandler MessageReceived;

        private string host;
        private string database;
        private string user;
        private string password;
        private MySqlConnection connection;
        private List<string> rows = new List<string>();



        public MySqlConnector()
        {
            this.host = Settings.Default.db_host;
            this.database = Settings.Default.db_schema;
            this.user = Settings.Default.db_user;
            this.password = Settings.Default.db_pw;
            string myConnectionString = "SERVER=" + this.host + ";" +
                        "DATABASE=" + this.database + ";" +
                        "UID=" + this.user + ";" +
                        "PASSWORD=" + this.password + ";";

            connection = new MySqlConnection(myConnectionString);




        }

        public bool Connect()
        {
            if (connection.State != System.Data.ConnectionState.Open)
            {
                try
                {
                    connection.Open();
                    this.MessageReceived("Connected to Database");
                    return true;
                }
                catch (MySqlException ex)
                {
                    log.Error("failed to connect! mysql error: " + ex);
                    this.MessageReceived("No Database connection - Error: "+ex);
                    return false;
                }

            }
            else
            {
                this.MessageReceived("Connected to Database");
                return true;
            }

        }
        .
        .
        .
    }
}

任何提示都非常感谢！提前致谢！

Answer 1

如果你的意思永远意味着像30岁那样的东西？

您可能正在寻找在ConnectionString中添加TimeOut设置。

http://www.connectionstrings.com/mysql

当DB消失时，MySqlConnection Connect（）方法很慢抛出异常C＃

1 个答案: