C#模拟器“到多个连接”

Question

我最近收到了mysql to mysql错误，我使用了下面这样的sql查询

SET GLOBAL max_conmnections = 8000;和ive也会使mysql.pool.max to 8000更高，当我的模拟器在调试器中时，它会在这个空白处崩溃

private static SqlDatabaseClient CreateClient(int Id)
{
     MySqlConnection Connection = new MySqlConnection(GenerateConnectionString());
     Connection.Open();

     return new SqlDatabaseClient(Id, Connection);
}

当我收到10-12个在线连接时，模拟器在调试器中运行了7-8个小时，被高亮显示的那行导致它崩溃的代码是connection.open();！

Answer 1

您可以尝试在由C# 语句使用后关闭并处置连接和命令：

private static SqlDatabaseClient CreateClient(int Id)
{
    Int32 returnId = 0;

    try
    {
      using(MySqlConnection connection = new MySqlConnection(GenerateConnectionString()))
      {
        connection.Open();

        if(connection.State == ConnectionState.Open)
        {
           returnId = Id;
        }

      }
    }
    catch(Exception exception)
    {
       Console.Write(ex.Message);
    }
    finally
    {
        if(connection.State == ConnectionState.Open)
        {
           connection.Close();

        }
    }

    return returnId;
}

Answer 2

我建议重写成类似这样的内容：

  private static void ExecuteInClientContext(int Id, Action<SqlDatabaseClient> callback) {
    if (callback == null) {
      throw new ArgumentNullException("callback");
    }

    using(MySqlConnection Connection = new MySqlConnection(GenerateConnectionString())) {
      Connection.Open();
      callback.Invoke(new SqlDatabaseClient(Id, Connection));
    }
  }

  static void Foo() {
    ExecuteInClientContext(1, (context) => {
      // whatever
    });
  }

Answer 3

我认为您可以添加如下代码：SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);然后，在关闭SqlDataReader的实例后，Connection对象也将关闭。