連接泄漏是否會導致Timeout過期。 從池中獲取連接之前是否已經過了超時時間？

Question

我收到此錯誤導致我的應用程序停止工作。 Timeout expired. 從池中獲取連接之前經過的超時時間。 這可能是因為所有池連接都在使用中並且達到了最大池大小。

但是我沒有達到我的最大連接池。 我有RDS，在我的監控頁面中，我發現此錯誤發生時連接數為33，默認情況下我的最大值為100。

所以，我想知道這可能是由於我的連接泄漏造成的。

這是我用來連接數據庫的DBLayer類。

public static DataTable GetDataTable(SqlCommand command, IsolationLevel isolationLevel = IsolationLevel.ReadUncommitted)
{
    using (new LoggingStopwatch("Executing SQL " + command.CommandText, command.Parameters))
    {
        using (var connection = new SqlConnection(connectionString))
        using (var dataAdapter = new SqlDataAdapter(command))
        {
            command.Connection = connection;
            command.CommandTimeout = ShopexConfiguration.SqlTimeout;
            connection.Open();
            var transaction = connection.BeginTransaction(isolationLevel);
            command.Transaction = transaction;
            try
            {
                var result = new DataTable();
                dataAdapter.Fill(result);
                transaction.Commit();
                return result;
            }
            catch
            {
                try
                {
                    transaction.Rollback();
                }
                catch (Exception)
                {
                    //
                    // This catch block will handle any errors that may have occurred 
                    // on the server that would cause the rollback to fail, such as 
                    // a closed connection.
                }
                throw;
            }
        }
    }
}

我只是想知道，這會導致連接泄漏嗎？

我看過這個博客：

https://blogs.msdn.microsoft.com/spike/2008/08/25/timeout-expired-the-timeout-period-elapsed-prior-to-obtaining-a-connection-from-the-pool/

任何幫助表示贊賞？

Answer 1

您確定，您的查詢未達到執行超時嗎？ SqlConnection.ConnectionTimeout的默認值為15秒

你的connectionString格式中還有一些連接超時值是： “......;連接超時= 10 ......”

Answer 2

我認為你應該在你的finally語句中關閉你的連接，如下所示：

public static DataTable GetDataTable(SqlCommand command, IsolationLevel isolationLevel = IsolationLevel.ReadUncommitted)
{
    using (new LoggingStopwatch("Executing SQL " + command.CommandText, command.Parameters))
    {
        using (var connection = new SqlConnection(connectionString))
        using (var dataAdapter = new SqlDataAdapter(command))
        {
            command.Connection = connection;
            command.CommandTimeout = ShopexConfiguration.SqlTimeout;
            connection.Open();
            var transaction = connection.BeginTransaction(isolationLevel);
            command.Transaction = transaction;
            try
            {
                var result = new DataTable();
                dataAdapter.Fill(result);
                transaction.Commit();
                return result;
            }
            catch
            {
                try
                {
                    transaction.Rollback();
                }
                catch (Exception)
                {
                    //
                    // This catch block will handle any errors that may have occurred 
                    // on the server that would cause the rollback to fail, such as 
                    // a closed connection.
                }
                finally { connection.Close(); }
                throw;
            }
        }
    }
}

也許它可以解決您的問題，因為您在catch語句中回滾事務而不關閉現有連接，您也可以在打開SQL連接之前使用以下條件：

    if (connection.State == ConnectionState.Closed) {
        // Open your connection here
        connection.Open();
    }
// Do your logic here

希望它能幫到你。

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