在 Ubuntu/Visual Studio 代码上从 .Net Core 连接到 SqlServer

Question

我有一个连接到 SQL 服务器数据库的控制台应用程序（托管在同一网络内的专用 win 机器上），用 .Net 核心编写（使用 Visual Studio 代码）它在 Windows 上运行良好。

Visual Studio 上的完全相同的代码库运行 Ubuntu 上的代码无法连接到 SQL 服务器实例，表示找不到服务器。

我可以 ping SQL 服务器 IP 并从中得到响应。

我还可以使用 1433 端口上的 telnet 连接到 SQL服务器实例。

此外，我已按照建议从 nuget 中提取 System.Data.Common 和 System.Data.SqlClient，并按照建议在连接字符串中设置 MultipleActiveResultSets=False。

为了完整起见，这是尝试连接的代码：

var connection = new SqlConnection(myConnectionString);
connection.Open();

这是堆栈跟踪：

Unhandled Exception: System.Data.SqlClient.SqlException: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 35 - An internal exception was caught) ---> System.AggregateException: One or more errors occurred. (No such device or address) ---> System.Net.Internals.SocketExceptionFactory+ExtendedSocketException: No such device or address
   at System.Net.Dns.HostResolutionEndHelper(IAsyncResult asyncResult)
   at System.Net.Dns.EndGetHostAddresses(IAsyncResult asyncResult)
   at System.Net.Dns.<>c.<GetHostAddressesAsync>b__14_1(IAsyncResult asyncResult)
   at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Data.SqlClient.SNI.SNITCPHandle.<ConnectAsync>d__22.MoveNext()
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait(TimeSpan timeout)
   at System.Data.SqlClient.SNI.SNITCPHandle..ctor(String serverName, Int32 port, Int64 timerExpire, Object callbackObject, Boolean parallel)
   --- End of inner exception stack trace ---
   at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, Boolean applyTransientFaultHandling)
   at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
   at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   at System.Data.SqlClient.SqlConnection.Open()

有什么想法吗？

谢谢

Answer 1

显然，因为 SQL 服务器存在于您的 windows 机器上，而它不存在于您的 Ubuntu 机器上。而且它不能安装在 Ubuntu 机器上。即使出于测试目的，您也必须将其托管在数据库服务器上，并将您的连接字符串指向该服务器。

编辑
尝试确保您的数据库服务器的防火墙没有阻止访问。即使你在同一台电脑上有双启动，它们仍然是两台不同的电脑机器。

Answer 2

我发现了这个问题，它已经作为一个问题在 coreclr 存储库中提出。问题是我正在连接的 SQLServer 实例版本。它是 2008r2 SP1，.net core sql 客户端无法连接到它。升级到 SP3 修复它。

More details here

在 Ubuntu/Visual Studio 代码上从 .Net Core 连接到 SqlServer

Connecting to SqlServer from .Net Core on Ubuntu/Visual Studio Code

sql-server

ubuntu

.net-core

visual-studio-code