Question

我是ASP.NET新手并且遵循一个教程，用户可以在该教程中注册一个站点并检查数据库以查看用户名是否已存在。当有时间创建数据库时，教程说要在visual studio（mdf文件）中创建它，但是我使用MYSQL Workbench，所以我在那里创建它并尝试自己连接它。

在Visual中的数据连接下添加连接时，我能够看到我的数据库和测试连接有效。

添加SQLDataSource时，我能够成功运行测试查询并从数据库中读取。我甚至将它与GridView一起用于在网页上显示数据。

但是当在cs文件中打开连接时，我收到了错误。

[Win32Exception (0x80004005): The system cannot find the file specified]

[SqlException (0x80131904): 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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)]
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +5347119
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +546
   System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover) +5358907
   System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover) +145
   System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout) +892
   System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance) +311
   System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData) +646
   System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) +278
   System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions) +38
   System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) +732
   System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) +85
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) +1057
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +78
   System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) +196
   System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +146
   System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +16
   System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry) +94
   System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +110
   System.Data.SqlClient.SqlConnection.Open() +96
   Registration.Page_Load(Object sender, EventArgs e) in e:\WebSite\Registration.aspx.cs:15
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +92
   System.Web.UI.Control.LoadRecursive() +54
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772

此处的代码中出现错误

15 SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["RegisterCS"].ConnectionString);
16 conn.Open();//ERROR HERE

这是我的web.config，以防万一

<?xml version="1.0"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <connectionStrings>
    <add name="RegisterCS" connectionString="server=localhost;User Id=root;password=******;database=asptest"
      providerName="MySql.Data.MySqlClient" />
  </connectionStrings>
  <system.web>
    <compilation debug="true" targetFramework="4.0"/>
  </system.web>


</configuration>

我环顾四周，显然它可以是连接字符串，但我认为它应该没问题，因为数据源实际上是从数据库中成功读取的吗？我错过了正确连接数据库的东西吗？也许我必须在Workbench中做些什么？我也试过防火墙了。感谢。

Answer 1

MySQL连接字符串{$initTime - $currentTime > 300}和Uid分别代替Pwd和User Id。

http://dev.mysql.com/doc/connector-net/en/connector-net-programming-connecting-connection-string.html

以下是示例连接字符串：
Password
在此示例中，Server=127.0.0.1;Uid=root;Pwd=12345;Database=test;对象配置为连接到MySqlConnection的MySQL服务器，用户名为127.0.0.1，密码为root。所有语句的默认数据库都是12345数据库。

此外，评论讨论揭示test不是Port的标准/默认值，而是3306。因此连接字符串应如下所示：

此外，您可能不需要将Server=localhost;Uid=root;Pwd=******;Database=asptest;Port=5354更改为User Id，将Uid更改为Password，这些选项的文档允许以下内容：

密码，密码;正在使用的MySQL帐户的密码。

用户ID，用户ID，用户名，Uid，用户名，用户：正在使用的MySQL登录帐户。

http://dev.mysql.com/doc/connector-net/en/connector-net-connection-options.html

最后，您需要MySQL Connector。然后，您需要将Pwd切换为SqlConnections

无法在cs文件中打开sql连接 - asp.net

1 个答案: