I installed mysql on machine.
I installed GenyMotion Android Emulator
I use the Xamarin MySQL Connector in my Xamarin App.
How do I connect to the mysql database from the Xamarin App running in Genymotion?
Note using 127.0.0.1 as an IP address WON'T work for obvious reasons.
Your app shouldn't talk directly to the database server. Going through an API is a better approach.
Now that we got this out of the way here's a short example taken from here:
try
{
string connectionString = "Server=your.ip.address;Port=3306;database=YOUR_DATA_BASE;User Id=root;Password=password;charset=utf8";
MySqlConnection sqlconn = new MySqlConnection(connectionString);
sqlconn.Open();
string queryString = "select count(0) from ACCOUNT";
MySqlCommand sqlcmd = new MySqlCommand(queryString, sqlconn);
String result = sqlcmd.ExecuteScalar().ToString();
// do something with the results
sqlconn.Close();
} catch (Exception ex)
{
Console.WriteLine (ex.Message);
}
You should be able to get the IP address to use from the virtual network adapter created by GenyMotion (which uses VirtualBox)
Related
I'm develop a new project for Medical Laboratory by using visual studio C# WinForms for user interaction and MYSQL for database. After my successful build its running successfully in my windows machine. But the problem is when I install my project on another windows machine, the front end of UI running well but the database throw an error to me. The error is Authentication to host 'localhost' for user 'root' using method 'caching_sha2_password' failed with message: Unknown database 'login'. I think the error was I need to add MYSQL reference in my project. but I'm absolutely don't know how to do it. I'm really sorry to all coz I'm noob in C# and my English.
and literally thanks to all.
public partial class registration : Form
{
string connectionstring = "server = localhost; user id = root; database = login; password =
qwerty;";
MySqlConnection connection = new MySqlConnection(connectionstring);
MySqlCommand cmd;
connection.Open();
try
{
cmd = connection.CreateCommand();
cmd.CommandText = "ALTER TABLE register ADD UNIQUE INDEX(rgstrid);";
cmd.CommandText = "INSERT IGNORE INTO register(username, password,confirm) VALUES(#username,#password,#confirm)";
cmd.Parameters.Add("#username", MySqlDbType.VarChar).Value = rgstrusrnmtxtbx.Text;
cmd.Parameters.Add("#password", MySqlDbType.VarChar).Value = rgstrpswdtxtbx.Text;
cmd.Parameters.Add("#confirm", MySqlDbType.VarChar).Value = rgstrcnfrmtxtbx.Text;
DataTable table = new DataTable();
MySqlDataAdapter adapter = new MySqlDataAdapter();
adapter.SelectCommand = cmd;
adapter.Fill(table);
if (cmd.ExecuteNonQuery() == 1)
{
MessageBox.Show("Your Account resgistred Successfully", "information", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
MessageBox.Show("Account saved Successfully","Success",MessageBoxButtons.OK,MessageBoxIcon.Information);
}
catch (Exception)
{
throw;
}
finally
{
if (connection.State == ConnectionState.Open)
{
connection.Close();
}
}
}
You probably need to include a reference to a library to talk to MySql, like the MySql.Data package. Adding it as a nuget reference should ensure the required files are installed with the rest of the application files.
Your installer also needs to install some software. The database engine itself if you are running a local database, but also a .net connector for the ado.net driver.
At least this is how we do it. You might be able to avoid some components depending how you are accessing the database.
When installing the database you should specify the root password. For example by giving the rootpasswd=qwerty parameter to the MySQLInstallerConsole.exe program.
Your install script also needs to setup the database, i.e. either run sql files to create any tables and fill it with data, or copy the database files themselves, or run some program to create the tables.
I'm trying to connect a winforms .net application with an AWS RDS MySQL database but I am having difficulty making the connection. I have read a lot of material about connecting through Microsoft SQL database and through Elastic Beanstalk but I haven't come across the answer I'm looking for... possibly because I'm a noob.
I've looked through a few of these questions:
How to connect to MySQL Database?
https://dev.mysql.com/doc/dev/connector-net/8.0/html/T_MySql_Data_MySqlClient_MySqlConnection.htm
using MySql.Data.MySqlClient;
string connection = "server=localhost; Database=database_URL; User Id=admin;
Password=myPassword";
myConn.Open();
MessageBox.Show("Success");
I'm getting the following error message:
MySql.Data.MySqlClient.MySqlException: 'Unable to connect to any of the specified MySQL hosts.'
Is there something simple that I'm missing? I have copied the database endpoint into the database_URL location. My user id and password are correct. My database is setup on AWS as a MySQL database.
Checking back with ConnectionStrings makes it appear as if your parameter-names are wrong. 'username' should be 'uid' and 'password' should be 'pw'.
In any case I'd suggest using the MySqlConnectionStringBuilder-class to construct your connection string.
var connectionStringBuilder = new MySqlConnectionStringBuilder
{
Server = "<Instance_Ip>",
UserID = "root",
Password = "<Password>",
Database = "<Database_Name>"
};
using (var conn = new MySqlConnection(connectionStringBuilder.ToString()))
The error message is given because can't connect to the host.
In your connection string is given the localhost as the server but your database is on cloud (AWS), so it means that you must specify the database's IP or the domain name pointing to that database, not the local (local means that is in your computer). e.g.
string conn = "server=192.168.0.7; Database=database_name; User Id=admin;
Password=myPassword";
Note that the server IP is provided by AWS, and you'd make sure that ports are enable. The most common port for MySQL is 3306.
Best regards.
Try this,
//This is my connection string i have assigned the database file address path
string MyConnection2 =
"host='localhost';database='databasename';username='myusername';password='mypassword'";
//This is my insert query in which i am taking input from the user through windows forms
string Query = "Your query";
//This is MySqlConnection here i have created the object and pass my connection string.
MySqlConnection MyConn2 = new MySqlConnection(MyConnection2);
//This is command class which will handle the query and connection object.
MySqlCommand MyCommand2 = new MySqlCommand(Query, MyConn2);
MySqlDataReader MyReader2;
MyConn2.Open();
MyReader2 = MyCommand2.ExecuteReader();
// Here our query will be executed and data saved into the database.
MessageBox.Show("Save Data");
while (MyReader2.Read())
{
}
MyConn2.Close();
When use Oledb c# connection
I noticed that a lot connection using file.
But how to connect to localhost using oledb?
I created database and tables using Microsoft SQL Server Management that connect with SQL Express and using window authentication
When using this function i don't know how should convert to connect to localhost
//Want the connString to connect localhost instead of file
public static string connString = #"Provider=Microsoft.JET.OLEDB.4.0;data source=" + Path + "\\database\\errDB.mdb";
public static OleDbConnection connection;
public myFunction()
{
string sqlString = "SELECT name,contact,accessLevel,Crudential_ID FROM errors where Crudential_ID =#ID";
connection = new OleDbConnection(connString);
OleDbCommand command = new OleDbCommand(sqlString, connection);
//Open connection
connection.Open();
command.Parameters.Add("#ID", OleDbType.VarChar);
command.Parameters["#ID"].Value = "test";
//Read from database
OleDbDataReader reader = command.ExecuteReader();
if(reader.HasRows)
{
.....
}
connection.Close();
}
connectionstrings.com - true to its name - is indispensable when you frequently need to construct connection strings. For your specific case, this would be the relevant section.
Based on that, your connection string should look something like this:
Provider=SQLNCLI11;Server=.\SQLEXPRESS;Database=SOMEDATABASE;Trusted_Connection=yes;
To break it down:
SQLNCLI11 is the SQL Native Client OLEDB provider. You can see available providers in SQL Management Studio, under Server Objects > Linked Servers > Providers.
.\SQLEXPRESS is your servername and instance. The . is shorthand for localhost (you can also use localhost if you prefer), and SQLEXPRESS is the default instance name that SQL Express installs under.
SOMEDATABASE - whatever your database name is.
Trusted_Connection=yes - Use windows authentication. Sometime you see it as Integrated Security=SSPI. They are one and the same.
If you are using SQL Express then I would suggest using a System.Data.SqlClient.SqlConnection object to make your connection. You will only need your server name to connect.
Server=ServerName\SQLEXPRESS;Database=Blah;User ID=user;Password=pw
I'm trying to connect on some web hosting using C# Windows application, but unsuccessfuly.
I use this con string:
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;
I'm sure that values in con string are ok, because i have used this values in php connect script.
Here is the test code:
string conString = "Server=localhost;Database=********;Uid=********;Pwd=********;";
MySqlConnection con = new MySqlConnection(conString);
try
{
con.Open();
MessageBox.Show("Connected!");
}
catch (MySqlException mex)
{
MessageBox.Show(mex.Message);
con.Close();
}
I have MySql connector installed, i have tried another port 3307, but unsuccessfully.
From here i used values in connection string:
I am new to SmartDeviceProject. So When i try to connect MySQL to my project, MissingManifestResourceException through in Connection.open in below code?.
string connectionString = "server=192.168.1.100;database=mcubic;User Name=mcubic;Password=mcs#2011$;";
string query = "select b.Outlet_Master_Name from mcs_user_outlet a,outlet_master b where a.Mcs_User_Outlet_User_Id=3 and a.Mcs_User_Outlet_Outlet_Id = b.Outlet_Master_Id";
MySqlConnection connection = new MySqlConnection(connectionString);
MySqlCommand command = new MySqlCommand(query, connection);
connection.Open();
MySqlDataReader Reader = command.ExecuteReader();
while (Reader.Read())
{
comboBox1.Items.Add(Reader[0].ToString());
}
connection.Close();
How do i solve this,. I am imported MySql.Data.CF.dll for this project.
Via Krish Kapadia from MSDN forums:
Solution :
MySql's version 5.2.7.0 is the stable version. I use dll of this version. Other versions have many problems. so first I download dll of that version from mysql site.
here is the link :
http://dev.mysql.com/downloads/connector/net/5.2.html
I have inserted one entry in 'mysql.user' table in which hostname will be '%' (means any user can connect to mysql). If you don't want to insert entry with hostname then you have to insert for all ip addresses who should be allowed to connect to mysql.
After inserting entry in 'mysql.user', I restarted MySQL service.
And then trying to connect to mysql and Connected....
source:
http://social.msdn.microsoft.com/Forums/eu/netfxcompact/thread/66f6386a-9963-4c2f-8d39-1c507a26a6c7