C# 从连接Firebird读取数据时出错

我们正在将数据从不同的源系统（Firebird、Oracle、SQL Server）迁移到一个目标系统（SQL Server）

从Firebird连接的连接异常读取数据时出错

我们正在使用的代码

用于创建SourceSystem对象的静态DbFactory类

基本DbManager类

从DbManager继承的FireBirdDbManager类

异常图像

运行3到4次迁移后，我们遇到异常。如果我重新启动服务，我们可以运行3到4次迁移

我们用来调用相应源系统的代码：

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我们是Firebird数据库系统的新手，无法解决这个问题。另一方面，我们正在使用Visual Studio 2012 Azure云服务

在通过ADO.NET数据提供程序（版本4.7.0）执行查询期间，通过任务管理器终止Firebird任务，从而重现Firebird 2.1.3.18185的问题。此后，我们始终收到以下例外情况：

System.Data.Entity.Core.EntityCommandExecutionException: An error occurred 
while executing the command definition. See the inner exception for details. 
    ---> FirebirdSql.Data.FirebirdClient.FbException: Error reading data from 
    the connection.
    ---> FirebirdSql.Data.Common.IscException: Error reading 
    data from the connection. at 
    FirebirdSql.Data.Client.Managed.Version10.GdsTransaction.BeginTransaction(Transa
    ctionParameterBuffer tpb) in c: Users Jiri Documents devel NETProvider 
    working NETProvider src FirebirdSql.Data.FirebirdClient Client Managed 
    Version10 GdsTransaction.cs:line 162 at 
    FirebirdSql.Data.Client.Managed.Version10.GdsDatabase.BeginTransaction(Transacti
    onParameterBuffer tpb) in c: Users Jiri Documents devel NETProvider working 
    NETProvider src FirebirdSql.Data.FirebirdClient Client Managed Version10 
    GdsDatabase.cs:line 571 at 
    FirebirdSql.Data.FirebirdClient.FbTransaction.BeginTransaction() in c: Users 
    Jiri Documents devel NETProvider working NETProvider src 
    FirebirdSql.Data.FirebirdClient FirebirdClient FbTransaction.cs:line 363 
— End of inner exception stack trace —

在我们的例子中，通过禁用连接池（连接字符串：“…；pooling=false”）解决并验证了问题。我们感兴趣的是，根据[1]的事实，当连接在多个请求之间断开时，使用连接池时，这是预期的行为

我希望这个答案能帮助别人。在我们的案例中，此解决方案还可以与当前的ADO.NET 5.0.5一起使用

致以最良好的祝愿， 托马斯

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[1]

我在执行该长度的查询时出现此错误>最大查询长度

在FireBird 4.x中，我从连接读取数据时出错 更新到6.6后，出现新错误“335544721：无法完成对主机的网络请求…”

通过拆分查询将其修复为较少的查询

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（使用UTF-8时默认为8191个字符）

“从连接读取数据时出错”通常表示连接意外关闭或以其他方式生成低级别IO错误。您使用的是哪个Firebird版本，以及哪个数据库连接库和版本？另外，请尝试禁用连接池。@MarkRotterVeel感谢您的输入。我需要与离岸团队核实，因为我们正在使用FlameRobin数据库管理员连接Firebird服务器。我们正在使用库DLL:FirebirdSql.Data.FirebirdClient和版本：4.8.0.0，删除了连接池和testing@MarkRotteveel还是一样的问题没有运气：（任何其他建议我能给你的唯一其他建议是升级到更新的Firebird版本（2.5.4）。要扩展我之前的评论，它看起来像服务器进程（对于Classic，它是每个连接）崩溃。这可能与使用带有错误的UDF有关，但也可能是由Firebird本身的错误引起的。自2.0.7以来，已有相当多的Firebird版本对服务器崩溃进行了错误修复。您可能还希望检查服务器的Firebird.log。禁用连接池（连接字符串：“…；池=false”）我也遇到了这个问题。令人遗憾的是，在ADO.net组件的5.12版发布之后，没有修复程序！！警告：这取决于应用程序的体系结构，但禁用池并不是每个应用程序的好选择，因为每次打开新连接都要花费大量时间。更好的解决方案是设置

connection.ConnectionLifeTime=60秒（大约），并让池管理器管理旧的连接。
public abstract class DbManager
{
    private DbConnection m_DbConnection;
    public virtual DbConnection DbConnection
    {
        get
        {
            if (m_DbConnection == null)
            {
                m_DbConnection = new SqlConnection();
            }
            return m_DbConnection;
        }
        set
        {
            this.m_DbConnection = value;
        }
    }



    public virtual void SetConnectionString(Migration migration, DataTable dtConnectionDetails = null)
    {
        try
        {
            DbConnection.ConnectionString = string.Format("Server={0};Database={1};User ID={2};Password={3};",
           migration.NetworkPartnerData.Server,
           migration.NetworkPartnerData.Database,
           migration.NetworkPartnerData.User,
          AESEncryptionDecryptionUtility.DecodeBase64(migration.NetworkPartnerData.Password));
        }
        catch
        {

            throw;
        }


    }

    public virtual void SetConnectionString(string connectionString)
    {
        try
        {
            DbConnection.ConnectionString = connectionString;
        }
        catch
        {

            throw;
        }


    }

    public virtual DataTable ExecuteDataTable(string ConnectionString, string queryText)
    {
        throw new NotImplementedException();
    }
}

 public class FireBirdDbManager : DbManager
{
    private FbConnection fbconnection;
    public override DbConnection DbConnection
    {
        get
        {
            if (fbconnection == null)
            {
                fbconnection = new FbConnection();
            }
            return fbconnection;
        }
        set
        {
            this.fbconnection = value as FbConnection;
        }
    }

    public override void SetConnectionString(Migration migration, DataTable connectionDetails)
    {

        this.DbConnection.ConnectionString = string.Format("Server={0};Database={1};Port=3050;User ID={2};Password={3};Pooling=true;MinPoolSize=0;MaxPoolSize=50;",
            migration.NetworkPartnerData.Server,
            migration.NetworkPartnerData.Database + BuildDatabaseName(Convert.ToString(connectionDetails.Rows[0]["CL_NBR"])) + ApplicationConstants.FIREBIRD_DBFILE_EXTENSION,
            migration.NetworkPartnerData.User,
           iMigrationTool.Common.AESEncryptionDecryptionUtility.DecodeBase64(migration.NetworkPartnerData.Password));
    }
    public override DataTable ExecuteDataTable(string ConnectionString, string queryText)
    {
        using (var connection = new FbConnection(ConnectionString))
        {
            try
            {


                DataTable dt = new DataTable();
                connection.Open();
                using (FbTransaction readTransaction = connection.BeginTransaction(IsolationLevel.ReadCommitted))
                {
                    FbCommand readCommand = new FbCommand();
                    try
                    {
                        readCommand.CommandText = queryText;
                        readCommand.Connection = connection;
                        readCommand.Transaction = readTransaction;
                        FbDataAdapter da = new FbDataAdapter(readCommand);
                        da.SelectCommand.CommandType = CommandType.Text;
                        da.Fill(dt);

                        readTransaction.Commit();
                    }
                    catch
                    {
                        readTransaction.Rollback();
                        throw;
                    }
                    finally
                    {
                        readTransaction.Dispose();
                        if (connection.State == ConnectionState.Open)
                        {
                            connection.Close();
                        }
                        connection.Dispose();
                    }
                    return dt;
                }
            }
            catch (Exception ex)
            {
                int errorCode = ex.HResult;
                Logger.LogApplicationException(ex, null, "ERRORCODE:" + errorCode + "ConnectionString:" + ConnectionString, "MigrationWorker");
                throw ex;
            }
        }
    }
}

System.Data.Entity.Core.EntityCommandExecutionException: An error occurred 
while executing the command definition. See the inner exception for details. 
    ---> FirebirdSql.Data.FirebirdClient.FbException: Error reading data from 
    the connection.
    ---> FirebirdSql.Data.Common.IscException: Error reading 
    data from the connection. at 
    FirebirdSql.Data.Client.Managed.Version10.GdsTransaction.BeginTransaction(Transa
    ctionParameterBuffer tpb) in c: Users Jiri Documents devel NETProvider 
    working NETProvider src FirebirdSql.Data.FirebirdClient Client Managed 
    Version10 GdsTransaction.cs:line 162 at 
    FirebirdSql.Data.Client.Managed.Version10.GdsDatabase.BeginTransaction(Transacti
    onParameterBuffer tpb) in c: Users Jiri Documents devel NETProvider working 
    NETProvider src FirebirdSql.Data.FirebirdClient Client Managed Version10 
    GdsDatabase.cs:line 571 at 
    FirebirdSql.Data.FirebirdClient.FbTransaction.BeginTransaction() in c: Users 
    Jiri Documents devel NETProvider working NETProvider src 
    FirebirdSql.Data.FirebirdClient FirebirdClient FbTransaction.cs:line 363 
— End of inner exception stack trace —