无法从ASP.NET连接到MySQL数据库

Question

I have got a problem with connection with MySQL Database. I got MySQLData.dll. My connection string looks like that:

String sCON = "Server=mysql51-105.perso; Database=adamlato;  UID=name; Password=pass";

I have got OVH server. I think server name is a problem. I'm getting the following error:

MySql.Data.MySqlClient.MySqlException (0x80004005): Unable to connect to any of the specified MySQL hosts.
 ---> System.Net.Sockets.SocketException (0x80004005): Żądana nazwa jest prawidłowa, ale dane żądanego typu nie zostały znalezione
     at System.Net.Dns.GetAddrInfo(String name)
     at System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)
     at System.Net.Dns.GetHostEntry(String hostNameOrAddress)
     at MySql.Data.Common.MyNetworkStream.GetHostEntry(String hostname)
     at MySql.Data.Common.MyNetworkStream.CreateStream(MySqlConnectionStringBuilder settings, Boolean unix)
     at MySql.Data.Common.StreamCreator.GetTcpStream(MySqlConnectionStringBuilder settings)
     at MySql.Data.Common.StreamCreator.GetStream(MySqlConnectionStringBuilder settings)
     at MySql.Data.MySqlClient.NativeDriver.Open()
     at MySql.Data.MySqlClient.NativeDriver.Open()
     at MySql.Data.MySqlClient.Driver.Open()
     at MySql.Data.MySqlClient.Driver.Create(MySqlConnectionStringBuilder settings)
     at MySql.Data.MySqlClient.MySqlPool.CreateNewPooledConnection()
     at MySql.Data.MySqlClient.MySqlPool.GetPooledConnection()
     at MySql.Data.MySqlClient.MySqlPool.TryToGetDriver()
     at MySql.Data.MySqlClient.MySqlPool.GetConnection()
     at MySql.Data.MySqlClient.MySqlConnection.Open()
     at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
     at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
     at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable)
     at _Default.Page_Load(Object sender, EventArgs e)
 in c:\Users\Adam\Documents\Visual Studio 2013\WebSites\WebSite2\Default.aspx.cs:line 20

Answer 1

• Add ProviderName=MySql.Data.MySqlClient to your connection string
• Add reference MySQL.Data to your project

Additional troubleshooting, Make sure about the following:

1. database started and accepting queries.
2. Can you connect to the database locally on the database server?
3. Do you have a firewall between the web server and the database server or are they on the same machine?

More Help on the following reference: http://www.codeproject.com/Articles/43438/Connect-C-to-MySQL

Answer 2

You are missing provider name. please try this one

String sCON = "Data Source=mysql51-105.perso; Initial Catalog=adamlato;  User Id=name; Password=pass;";

Answer 3

This error commonly occurs if the connection string isn't specified correctly.

For those coming from a SqlServer background, note that MySql 's connection string is very different:

• providerName="MySql.Data.MySqlClient" in place of providerName="System.Data.SqlClient"

For the connectionString= settings:

• Server=Host.Name.com (or IP) - (same, but no :Port suffix)
• Port=nnnn - default to 3306
• DataBase=MyDatabase . Not Initial Catalog
• Uid= or User Id= (same)
• Pwd= or Password= (same)
• Add Charset=utf8 if you require Unicode Support (eg if your Unicode chars are stored as ????)

Answer 4

try modifying your machine.config file to include the present connectionstring alongside the default sqlExpress connectionString. Also make sure your actual connectionstring in your code doesn't contain the port details. Worked for me...