how do i connect to Mysql database using c#?
i have this code
entstring MyConnection = "server=localhost; port=3306; databae=database_name; uid=root;pwd=;sslMode=None; ;
First download MySql.Data package from nuget package manager then add namespace
//Add MySql Library
using MySql.Data.MySqlClient;
Connection Code-
string connString = "server=server;user=user;database=db;password=*****;";
MySqlConnection con = new MySqlConnection(connString);
this is an idea .
string MyConnection = "server=localhost; port=3306; databae=database_name; uid=root;pwd=;sslMode=None; ;
string Query = "INSERT INTO table_name(username,password)VALUES('"+textbox_name.Text+"','"+password_name.Password+"');
MySqlConnection con = new MySqlConnection(MyConnection);
MySqlCommand command = new MySqlCommand(Query,con);
con.open();
try{
command.ExcuteNonQuery();
}
catch(Expection ex)
{
MessageDialog box = new MessageDialog(ex.ToString());
box.ShowAsync();
}
con.close();
}
Related
How can I connect a SQL database in C#?
My code:
const string connectionString = "Data Source=127.0.0.1;User ID=root;Database=MyDatabase;Password=MyPassword";
var conn = new SqlConnection(connectionString);
conn.Open();
conn.Close();
I get: Error: 40 - could not open a connection to sql server. I tried also in Python and it worked well:
cnx = mysql.connector.connect(user='root', password='MyPassword', host='127.0.0.1', database='MyDatabase')
cursor = cnx.cursor()
What am I missing in C#?
Please use MySqlConnection for MySql DB.
const string connectionString = "Data Source=127.0.0.1;User ID=root;Database=MyDatabase;Password=MyPassword";
MySqlConnection conn = new MySqlConnection(connectionString );
conn.Open();
string sqlcommand = "SELECT Query";
MySqlCommand cmd = new MySqlCommand(sqlcommand , conn);
please follow this example
using MySql.Data.MySqlClient;
var connectionString = "server=serveradress;database=dbName;user id=sqluser;password=abc;";
using (var connection = new MySqlConnection(connectionString))
{
connection.Open();
using var command = new MySqlCommand("SELECT COUNT(*) FROM tableName ", connection);
var Count = command.ExecuteScalar();
Console.WriteLine($"There are {Count } movies");
}
server adress in general is 127.0.0.1 ,if you are working locally
here the source page :
example
and also consider reading this page here docs
I am trying to connect to the SQL server with the below connection string but it is giving this "error Connect Timeout expired"
I have tried to telnet and it connected successfully. However, from the code, I cannot connect even though I have tried to specify the default port.
Is there anything am doing wrong? Thank you in advance.
string _connectionString = #"Server=myIP,1433;Database=myDB;User Id=myID;Password=myPass;";
using (MySqlConnection con = new MySqlConnection(_connectionString))
{
con.Open();
string sqlQuery = "SELECT * FROM Inventory";
using (MySqlCommand cmd = new MySqlCommand(sqlQuery, con))
{
MySqlDataReader result = cmd.ExecuteReader(CommandBehavior.CloseConnection);
while (result.Read())
{
}
con.Close();
}
}
Telnet result
Use backslash if you have an instance of your SQL Server "Server=myIP\sqlexpress".
If the server is your local machine, use Windows Authentication instead:
"Server= localhost; Database= myDB; Integrated Security=True;"
Or you can use App.Config to configure your SQL connection`, this is how I configure mine using Windows Authentication, not username and password. First, add an App.config to your application. Then add this:
<connectionStrings>
<add name="SqlConnectionString" connectionString="Data Source=localhost;Initial Catalog=myDB;Integrated Security=true"/>
</connectionStrings>
And on your program:
string _connectionString = string connString = ConfigurationManager.ConnectionStrings["SqlConnectionString"].ConnectionString;
using (con = new SqlConnection(_connectionString))
{
string sqlQuery = "SELECT * FROM Inventory";
SqlCommand cmd = new SqlCommand(sqlQuery, con)
con.Open();
SqlDataReader result = cmd.ExecuteReader();
while (result.Read())
{
}
con.Close();
}
Don't forget to add using directive:
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
This question already has answers here:
How to connect to MySQL Database?
(6 answers)
Closed 3 years ago.
What should I do to connect to MySql?
string constr = "Data Source=steve-pc;Initial Catalog=itcast2014;Integrated Security=True";
using (SqlConnection con = new SqlConnection(constr))
{
string sql = "select count(*) from TblPerson";
using (SqlCommand cmd = new SqlCommand(sql, con))
{
con.Open();
//object count = (int)cmd.ExecuteScalar();
object count = Convert.ToInt32(cmd.ExecuteScalar());
Console.WriteLine("TblPerson表中共有{0}条数据。", count);
}
}
You will have to install package for mysql data. Once you have that installed and added references, you can do it like this :
string server = "steve-pc";
string database = "itcast2014";
string username = "YourMysqlUsername";
string password = "YourMysqlPassword";
string connstring = string.Format("Server={0}; database={1}; UID={2}; password={3}",server, database, username, password);
using(var connection = new MySqlConnection(connstring);
{
connection.Open();
string query = "select count(*) from TblPerson";
var cmd = new MySqlCommand(query, dbCon.Connection);
var reader = cmd.ExecuteReader();
while(reader.Read())
{
string personsCount = reader.GetString(0);
Console.WriteLine(personsCount);
}
connection.Close();
}
More detailed and better answer for this is on How to connect to MySQL Database?
Install Oracle's MySql.Data NuGet package, to add it as a package and it is the easiest way to do. You don't need anything else to work with MySQL database.
Or you can run below command in Package Manager Console
PM> Install-Package MySql.Data
and this answer could help you: How to connect to MySQL Database?
I've always used Oledb Connection.
but now I need to connect with my Database via Sql connection
yet I don't know how to do so,
can some one provide me an example of a database connected with sql connection?
this code needs a sql connection to be done successfully.
protected void Button1_Click(object sender, EventArgs e)
{
string st = this.TextBox1.Text;
string sqlstr2 = "select * from hsinfo WHERE rname='"+st+ "'";
SqlCommand cmd = new SqlCommand(sqlstr2,);
using (SqlDataReader rd = cmd.ExecuteReader())
{
this.Label1.Text = rd["rmail"].ToString();
}
}
You can check the official Microsoft page for more details SqlConnection Class, but I will reproduce the given example below ...
Aditionally you can check also the Connection String Syntax linked in the previous link.
private static void CreateCommand(string queryString,
string connectionString)
{
using (SqlConnection connection = new SqlConnection(
connectionString))
{
SqlCommand command = new SqlCommand(queryString, connection);
command.Connection.Open();
command.ExecuteNonQuery();
}
}
This is a simple example code and it's working. This might help you.
Here NextMonth,NextYear,ProcessedDate are auto calculated values comes from another function don't think about that.
String cs = #"Data Source=LENOVO-G510;Initial Catalog=Nelna2;Persist Security Info=True;User ID=sa;Password=123";
protected void Save_Click(object sender, EventArgs e)
{
// SqlConnection con = new SqlConnection(cs);
using (SqlConnection con = new SqlConnection(cs))
{
try
{
SqlCommand command5 = new SqlCommand("insert into MonthEnd (month,year,ProcessedDate) values (#month2,#year2,#ProcessedDate2) ", con);
command5.Parameters.AddWithValue("#month2", NextMonth);
command5.Parameters.AddWithValue("#year2", NextYear);
command5.Parameters.AddWithValue("#ProcessedDate2", ProcessedDate);
command5.ExecuteNonQuery();
}
catch (SqlException ex)
{
Response.Write(ex.Message);
}
}
}
Connection string can be found in DB properties. right click on DB -> properties and Get the Connection String
There is no enougth information to build connection for you, but in the shortes you sth like this:
Server=...;Database=...;User ID=...;Password=...;
For more information just check ConnectionStrings website.
try below code and for more information about c# SQL server connection see this SQL Server Connection
string connetionString = null;
SqlConnection cnn ;
connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserName;Password=Password"
cnn = new SqlConnection(connetionString);
try
{
cnn.Open();
MessageBox.Show ("Connection Open ! ");
cnn.Close();
}
catch (Exception ex)
{
MessageBox.Show("Can not open connection ! ");
}
I would do something like this:
public static List<Test> GetTests(string testVariable)
{
DataTable result = new DataTable();
using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["Database"].ConnectionString))
{
connection.Open();
GetQuery(
connection,
QueryGetTests,
ref result,
new List<SqlParameter>()
{
new SqlParameter("#testVariable", testVariable)
}
);
return result.Rows.OfType<DataRow>().Select(DataRowToTest).ToList();
}
}
private static void GetQuery(SqlConnection connection, string query, ref DataTable dataTable, List<SqlParameter> parameters = null)
{
dataTable = new DataTable();
using (SqlCommand command = new SqlCommand(query, connection))
{
command.CommandTimeout = 120;
if (parameters != null)
{
foreach (SqlParameter parameter in parameters)
{
command.Parameters.Add(parameter);
}
}
using (SqlDataAdapter reader = new SqlDataAdapter(command))
{
reader.Fill(dataTable);
}
}
}
I think this can help you.
string sqlString = "select * from hsinfo WHERE rname=#st";
using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DatabaseName"].ConnectionString))
{
conn.Open();
using (SqlCommand cmd = new SqlCommand(sqlString, conn))
{
cmd.Parameters.Add("#st", st);
using (SqlDataReader rd = cmd.ExecuteReader())
{
if (rd.Read())
{
this.Label1.Text = rd["rmail"].ToString();
}
}
}
}
Trick:
Create a file with .udl Extension on your Desktop
Run it by Double click
Compile form by Choosing provider, username, password, etc...
Test connection and save
Close the form
Open now the .udl file with Notepad
You will see the connection string that you can use with ADO.NET
I built a windows form application using c# as a programming language and MySQL as DBMS, I want to add a button for exporting database when user click it.
What I created so far is :
MySqlCommand cmd = new MySqlCommand("SELECT * FROM client INTO OUTFILE '"+path+"' FIELDS TERMINATED BY ',' ENCLOSED BY '\"' LINES TERMINATED BY'\\n' ", con);
MySqlDataReader dataReader = cmd.ExecuteReader();
dataReader.Read();
But the problem is that this code export data only NOT schema of tables. Is there is any way to export database with schema by SQL statement.
You can use MySqlBackup.NET
https://github.com/MySqlBackupNET/MySqlBackup.Net
Sample codes:
Backup a MySQL database
using MySql.Data.MySqlClient;
then the code,
private void Backup()
{
string constring = "server=localhost;user=root;pwd=qwerty;database=test;";
string file = "C:\\backup.sql";
using (MySqlConnection conn = new MySqlConnection(constring))
{
using (MySqlCommand cmd = new MySqlCommand())
{
using (MySqlBackup mb = new MySqlBackup(cmd))
{
cmd.Connection = conn;
conn.Open();
mb.ExportToFile(file);
conn.Close();
}
}
}
}
Restore a MySQL database
private void Restore()
{
string constring = "server=localhost;user=root;pwd=qwerty;database=test;";
string file = "C:\\backup.sql";
using (MySqlConnection conn = new MySqlConnection(constring))
{
using (MySqlCommand cmd = new MySqlCommand())
{
using (MySqlBackup mb = new MySqlBackup(cmd))
{
cmd.Connection = conn;
conn.Open();
mb.ImportFromFile(file);
conn.Close();
}
}
}
}