Question

我是MemSQL数据库的新手，我在Linux Redhat V6上安装了MemSQL数据库服务器。我还创建了一个名为＆＃34; Test＆＃34;的测试数据库，用户名为：root，密码为：root 我可以在本地连接到这个数据库，我也知道我可以使用MySQL提供程序从ODBC连接到Windows的MemSQL数据库。我尝试从Windows连接到MemSQL，但是我收到了一个错误（连接失败：驱动程序丢失了连接到MySQL服务器＆＃39;读取初始通信数据包＆＃39;）。我的问题是：是否可以从Windows连接到MemSQL数据库？如果是的话，我怎样才能使用C＃（我应该使用什么提供商，配置等）。谢谢

Answer 1

这看起来更像是网络/防火墙问题。最简单的检查方法是在客户端和服务器上禁用防火墙，以查看是否一切正常。

MemSQL只使用MySQL兼容性，因此官方MySQL C＃客户端可以正常工作。您可以从nuget：defaultdict

安装它

using System;
using System.Data;
using System.Threading;
using System.Diagnostics;
using MySql.Data.MySqlClient;

namespace MemSQLTest {
  //Thread creates a connection and inserts for 1000 milliseconds
  public class WorkerThread {
    public static void Thread() {
      try {
        IDbConnection conn;
        conn = new MySql.Data.MySqlClient.MySqlConnection();
        conn.ConnectionString = "Server=127.0.0.1;Uid=root;Pwd=;";
        conn.Open();

        IDbCommand dbcmd = conn.CreateCommand();
        dbcmd.CommandText = "USE db";
        dbcmd.ExecuteNonQuery();
        dbcmd.CommandText = "INSERT INTO t VALUES (DEFAULT)";
        Stopwatch stop = new Stopwatch();
        stop.Start();
        while(stop.ElapsedMilliseconds < 1000)
        {
          dbcmd.ExecuteNonQuery();
        }
      } catch (Exception ex) {
          Console.WriteLine(ex.Message);
      }
    }
  }
  class MemSQLTest {
    static void Main(string[] args) {
      try {
        IDbConnection conn;
        conn = new MySql.Data.MySqlClient.MySqlConnection();
        conn.ConnectionString = "Server=127.0.0.1;Uid=root;Pwd=;";
        conn.Open();

        //Initialize database with auto increment table
        IDbCommand dbcmd = conn.CreateCommand();
        dbcmd.CommandText = "DROP DATABASE IF EXISTS db";
        dbcmd.ExecuteNonQuery();
        dbcmd.CommandText = "CREATE DATABASE db";
        dbcmd.ExecuteNonQuery();
        dbcmd.CommandText = "USE db";
        dbcmd.ExecuteNonQuery();
        dbcmd.CommandText = "CREATE TABLE t (id int primary key auto_increment)";
        dbcmd.ExecuteNonQuery();
        //Initialize threads
        Thread[] threads = new Thread[10];
        for(int i = 0; i < 10; i++)
        {
          threads[i] = new Thread(new ThreadStart(WorkerThread.Thread));
          threads[i].Start();
        }
        for(int i = 0; i < 10; i++)
        {
          threads[i].Join();
        }
        //Show select count(*) on auto increment table
        dbcmd.CommandText = "SELECT COUNT(*) FROM t";
        IDataReader reader = dbcmd.ExecuteReader();
        while(reader.Read()) {
          Console.WriteLine(reader["COUNT(*)"]);
        }
      } catch (Exception ex) {
        Console.WriteLine(ex.Message);
      }
    }
  }
}

以下是MemSQL文档中用于测试插入的快速示例：

https://www.nuget.org/packages/MySql.Data/

[
    {
        id: 1,
        name: 'test 1'
    },
    {
        id: 2,
        name: 'test 2'
    },
    {
        id: 3,
        name: 'test 3'
    },
    {
        id: 4,
        name: 'test 4'
    }
]

从C＃连接到MemSQL

1 个答案: