【发布时间】：2013-05-12 14:11:02
【问题描述】：
SqlConnection 在使用命名实例安装 SQL Server 的 Windows 2008 R2 独立环境中失败：
SqlConnection myConnection = new SqlConnection(
"user id=domain/username;password=pa$$word;server=MyServername/MyInstanceName;" +
"Trusted_Connection=yes;database=MyDatabase2;connection timeout=30");
我可以使用 Visual Studio 的“服务器资源管理器”成功连接到 SQL Server 实例它创建的连接字符串是：
Data Source= MyServername\MyInstanceName;Initial Catalog=MyDatabase2;Integrated Security=True
在我的 SqlConnection 中，我尝试了以下结果...
server=MyServername/MyInstanceName;" + //fails within timeout
server=MyServername\MyInstanceName;" + //Unrecognized escape sequence
server=MyServername\\MyInstanceName;" + //suspends far longer than timeout
server=localhost\\MyInstanceName;" + //suspends far longer than timeout
server=localhost/MyInstanceName;" + //fails within timeout
这不是远程连接。 VS 和 SQL Server 都在同一台机器上。如何连接到命名实例？
这是我收到的错误消息：
System.Data.SqlClient.SqlException (0x80131904): A network-related or instance-s
pecific 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 a
nd that SQL Server is configured to allow remote connections. (provider: Named P
ipes Provider, error: 40 - Could not open a connection to SQL Server) ---> Syste
m.ComponentModel.Win32Exception (0x80004005): The network name cannot be found
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception
, Boolean breakConnection, Action`1 wrapCloseInAction)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObj
ect stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternal
ConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Bool
ean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFa
ilover)
at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo
serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSn
iOpenTimeout, TimeoutTimer timeout, Boolean withFailover)
at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo
serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirect
edUserInstance, SqlConnectionString connectionOptions, SqlCredential credential,
TimeoutTimer timeout)
at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTime
r timeout, SqlConnectionString connectionOptions, SqlCredential credential, Stri
ng newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance)
at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdent
ity identity, SqlConnectionString connectionOptions, SqlCredential credential, O
bject providerInfo, String newPassword, SecureString newSecurePassword, Boolean
redirectedUserInstance, SqlConnectionString userConnectionOptions)
at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOp
tions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConn
ectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConn
ectionPool pool, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbCon
nectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnectionOptions
userOptions)
at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnectionOp
tions userOptions)
at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection ow
ningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean o
nlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& co
nnection)
at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection ow
ningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbCon
nectionInternal& connection)
at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection
owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions
, DbConnectionInternal& connection)
at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection
outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1
retry, DbConnectionOptions userOptions)
at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
at System.Data.SqlClient.SqlConnection.Open()
at ConsoleApplication1.Program.Main(String[] args) in c:\Users\hptSetupAdmin\
Documents\Visual Studio 2012\Projects\ConsoleApplication1_ConnToSql\ConsoleAppli
cation1\Program.cs:line 33
ClientConnectionId:00000000-0000-0000-0000-000000000000
谢谢！
【问题讨论】：
-
您的应用程序在什么凭据（Windows 用户）下运行？
-
尝试使用服务器资源管理器使用您在应用程序中提供的连接字符串参数进行连接
-
嗯.. 我不知道您可以使用域登录名和密码进行连接 - 我一直认为您需要一个受信任的连接。我可能是错的。假设这是一种合法的连接方式，您应该尝试在连接字符串用户 ID 中使用反斜杠而不是正斜杠：
...("user id=domain\username... -
以管理员身份运行visual studio并重试
-
尝试从连接字符串中删除受信任的连接部分。 "数据源=myServerAddress；初始目录=myDataBase；集成安全=SSPI；"
标签： c# sql-server