I am using a the C# ODBC object in asp.net to connect up to a MySQL server hosted on another computer (on the same network).
<%# Import Namespace="System.Data.Odbc" %>
<html>
<body>
<script language="C#" runat="server">
protected void Page_Load(Object Src, EventArgs E)
{
try
{
using(OdbcConnection connection = new OdbcConnection("DRIVER={MySQL ODBC 5.51.30 Driver};Database=test;Server=192.168.1.109;UID=Username;PWD=Password;"))
{
connection.Open();
using(OdbcCommand command = new OdbcCommand("SELECT * FROM tablename", connection))
using(OdbcDataReader dr = command.ExecuteReader())
{
while(dr.Read())
Response.Write(dr["name"].ToString() + "<br>");
dr.Close();
}
connection.Close();
}
}
catch(Exception ex)
{
Response.Write("An error occurred: " + ex.Message);
}
}
</script>
</body>
</html>
I am currently getting this error when I run the code:
An error occurred: ERROR [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
I am hosting this on a Microsoft IIS server, with ASP.net enabled. Would I be able to get any help with fixing this error?
Link to image of my MySQL server: http://i.stack.imgur.com/4NYCr.png
Would I be able to get any help with fixing this error?
Yes, you would. So, your only question was answered. And now? Please think a little more about WHAT you ask.
TO your problem.
Like always, http://www.connectionstrings.com/ is the primary resource for this ;) Anything you ever wanted to know about connectionstrings on one place.
For MySQL (asuming 5.2) you can find (for ODBC) the solution at:
http://www.connectionstrings.com/mysql-connector-odbc-5-2/
Now, your string looks good - so I start assuming you have a driver problem. I would assume that wherever you run it it just does not have - the ODBC ddriver installed.
THAT SAID: there is no real reason to use ODBC (which has native prerequisites) and not a (managed) MySQL Driver?
if you really miss the ODBC driver, you can ind the downloads at http://www.mysql.com/products/connector/. But I would really not use ODBC here - not with a native connector available.
I think you better use MySQlConnection as well as MyqlCommand for your needs:
eg:
server = "localhost";
database = "connectcsharptomysql";
uid = "username";
password = "password";
string connectionString;
connectionString = "SERVER=" + server + ";" + "DATABASE=" +
database + ";" + "UID=" + uid + ";" + "PASSWORD=" + password + ";";
connection = new MySqlConnection(connectionString);
Related
I have a problem to connect my C# application in Visual Studio 2019 to Database inside Snyology NAS using MariaDB 10. If I connected the Database with HeidiSQL works good, but if I try to connect C# App with the same credentials I see an error like this:
"Unable to connect to any of the specified MySQL hosts"
I tried to check and I verified that:
TCP functionality is enable on Synology NAS
User and password are correct and I have all the privileges
Database name is correct
Port is also correct 3307 (setting default on Synology)
This is the code that I use to check the connection:
string connectionString = "";
string server = "ip_address_NAS:3307";
string database = "my_Database";
string username = "my_user";
string password = "my_password";
MySql.Data.MySqlClient.MySqlConnection cn;
connectionString = "SERVER=" + server + ";DATABASE=" + database + ";UID=" + username + ";PASSWORD=" + password;
try
{
cn = new MySql.Data.MySqlClient.MySqlConnection(connectionString);
cn.Open();
label1.Text = "Database ONLINE!";
label1.ForeColor = System.Drawing.Color.Green;
cn.Close();
}
catch(Exception ex)
{
label1.Text = "Database OFFLINE!\n" + ex.Message;
label1.ForeColor = System.Drawing.Color.Red;
}
Why this error?
Can you help me? please.
Thank you.
Remove the port number from the hostname. If you are connecting to the default port, there's no need to specify a port. If you are connecting to a custom port, it has to be defined in the following way
Server=myServerAddress;Port=1234;Database=myDataBase;Uid=myUsername;Pwd=myPassword
Docs
Edit
3307 is not the default port for MySQL or MariaDB. So if your database is running on port 3307 (because for whatever reason Synology has chosen it to be the initial setting) you need to specify that port in the connection string. But not as part of the servername but with the Port=3307 property.
I'm aware there are similar questions all over the web, but I can't find anything for this particular issue. I have C# experience, but am pretty new to MySQL, so perhaps there's something I'm not understanding. I'm trying to make a simple select in C# from a MySQL table:
string server = "192.168.2.6";
string database = "productintegration";
string uid = "root";
string password = "Password1";
string connectionString = "SERVER=" + server + ";" + "DATABASE=" + database + ";" + "UID=" + uid + ";" + "PASSWORD=" + password + ";";
MySqlConnection connection = new MySqlConnection(connectionString);
string query = "select * from tcdidataimport";
connection.Open();
MySqlCommand cmd = new MySqlCommand(query, connection);
MySqlDataReader dataReader = cmd.ExecuteReader();
DataTable dt = new DataTable();
if (dataReader.HasRows)
{
dt.Load(dataReader);
}
connection.Close();
And I get the following exception:
Authentication to host '192.168.2.6' for user 'root' using method 'mysql_native_password' failed with message: Access denied for user 'root'#'JUSTINSPERSONAL' (using password: YES)
Seems simple enough... Except that I'm already connecting to that server (via MySQL Workbench) using that exact login.
Here is show grants;
Which seems to me that I should be able to log in using root at whatever I want? When I tried to create another user (CDISelector#'%') and grant privileges I got a similar error:
But I'm logged in as root? Am I missing something here? Finally, here's the results of select user(), current_user();
JUSTINSPERSONAL is my PC, 192.168.2.6 is the MySQL machine's IP. Not sure what I'm missing here but this all seems a little strange.
And it turns out I had the password incorrect. Ha.
I am trying to execute a command with OdbcCommand in c# but it seems i can't even open the connection. This is the data I got to create the Connection String
Server: APPRDNETEZZA (192.168.0.64)
Web Server: beamprdwb3
ODBC DSN Name (64bit): NZ_FUTUREBRANDS
User: MSTR_ADMIN
Port: 5480
This is my code
string connetionString = null;
OdbcConnection cnn;
OdbcCommand cmd;
string sql = null;
connetionString = "Driver={NetezzaSQL}; servername=APPRDNETEZZA ;
database=NZ_FUTUREBRANDS; port=5480; username=MSTR_ADMIN;
password=mstr17Uz1%4;";
sql = "CREATE EXTERNAL TABLE X_STORE_GROUP_GUID_12345(" +
"STORE_ID VARCHAR(10)," +
"STORE_NAME VARCHAR(50)," +
"USERID Varchar(255)," +
"import_guid Varchar(255), )" +
"USING(" +"DATAOBJECT('/apnas01/vol2.nfs.Data/ap_prod/data/store_upload/scripts/12345_guid_12345')" + "logDir '/apps/ap_prod/log'" + " delimiter ','" + " "; ";
cnn = new OdbcConnection(connetionString);
try
{
cnn.Open();
Console.WriteLine("Connection Opened ");
cmd = new OdbcCommand(sql, cnn);
cmd.ExecuteNonQuery();
cmd.Dispose();
cnn.Close();
result = "Executed sucessfully";
}
catch (Exception ex)
{
result = "Error" + ex.InnerException.ToString();
}
The error happens when it tries to open the connection. While debugging it gave me this inner exception
[ODBC Driver Manager] Data source name not found and no default driver
specified
I have the Odbc driver installed in my machine. I dont know it this is happening cuz the connection string is in bad format. I have spent many hours trying to figure it out why doesnt work. Appreciate any kind of help. Thanks
Here is an example Netezza ODBC connection string:
https://www.connectionstrings.com/netezzasql-odbc-driver/
Driver={NetezzaSQL};servername=myServerAddress;port=myPortNumber;
database=myDataBase;username=myUsername;password=myPassword;
Your connection string basically looks the same:
connetionString = "Driver={NetezzaSQL}; servername=APPRDNETEZZA ;
database=NZ_FUTUREBRANDS; port=5480; username=MSTR_ADMIN;
password=xyz;";
SUGGESTIONS:
Make the entire connection string (everything inside the quotes) ONE LINE. Don't break the string into separate lines.
Or use "+" (like you did with your SQL string).
Copy the driver (nsqlodbc.dll?) into the same directory as your .exe assembly (path issue?)
Try both the 32-bit and 64-bit drivers (CPU platform issue?)
Definitely post back what you find!
What could cause the following error for the very first time when the exact same code (that produces this error) has been working perfectly all day today?
--------------------------- 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)
--------------------------- OK
The code:
this.Cursor = Cursors.WaitCursor;
try
{
// Insert into database
sqlconnection = new SqlConnection(#"Data Source=" + Properties.Settings.Default.DBHost + ";Initial Catalog=BLAHBLAH;Persist Security Info=True;User ID=" + Properties.Settings.Default.DBUserName + ";Password=" + Properties.Settings.Default.DBPassword + ";");
sqlconnection.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = sqlconnection;
int count = 0;
foreach (var item in files)
{
cmd.CommandText = #"insert into Images (Name, Games) values ('" + item.Value + "', '" + games + "')";
cmd.ExecuteNonQuery();
count++;
}
}
catch(Exception exception)
{
MessageBox.Show(exception.Message);
}
sqlconnection.Close();
this.Cursor = Cursors.Default;
This is Sql server network connection error. try to login in sql browser also check your sql service is running or not and try to debug your code that are you able to open connection check/login credentials.
Firstly, I'd like to thank everyone for their help and suggestions. I've managed to solve this problem.
As it turns out, the reason this code was failing was because there was an issue with retrieving setting data from Properties.Settings.Default.SettingName. The settings are there and saved, but it wasn't able to retrieve the settings into variables for some reason.
I got this code to work by storing settings somewhere else other than Properties.Settings.
I read that I have to download this http://dev.mysql.com/downloads/mirror.php?id=13427#mirrors, but it says that I can't install it because I need .NET Framework. I already have 4.0?!
Use this link, it will work if you have VS.NET 2010 http://dev.mysql.com/downloads/connector/net/
Installer checking for .Net 3.5 or 2.0 mabey =
You should use MySQL Connector/Net 6.3.5 available at mentioned location (http://dev.mysql.com/downloads/connector/net/)
I pieced this together by copy/paste from an existing project then sanitizing it...so it's not been compiled and tested, but you get the idea. So here's some sample code to get you started:
using MySql.Data.Types;
using MySql.Data.MySqlClient;
private void Function()
{
//Set up connection, SqlHost/etc are classwide and declared elsewhere:
MySql connection = new MySqlConnection("SERVER=" + SqlHost + ";DATABASE=" + DatabaseName + ";UID=" + user + ";PASSWORD=" + password + ";pooling=false");
//Setup query:
MySqlCommand command = connection.CreateCommand();
MySqlDataReader Reader;
command.CommandText = "your query here";
//Connect to relation system and execute query:
connection.Open();
Reader = command.ExecuteReader();
while(Reader.Read())
{
MessageBox.Show("here's a row from the query response: " + Reader[0].ToString());
}
//Clean up:
connection.Close();
Reader.Close();
}