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;
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'm unable to insert data into table. we are using local db. I'm not even getting any exception
string constr = ConfigurationManager.ConnectionStrings["server"].ConnectionString;
private void button1_Click(object sender, EventArgs e)
{
try
{
SqlConnection con = new SqlConnection(constr);
SqlCommand cmd = new SqlCommand("insert into Client_Name(Name) values('" + textBox1.Text + "')",con);
cmd.Connection = con;
con.Open();
cmd.ExecuteNonQuery();
con.Close();
}
catch (Exception ee)
{
Console.Write("Exception");
}
}
In app.config
<connectionStrings>
<add name="server" connectionString="Data Source = (LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\msm.mdf;Integrated
Security=True;Connect Timeout=30" providerName="System.Data.SqlClient" />
</connectionStrings>
I have tried all the possible way, and got the best solution considering your scenario.
During an hour observation got to know due database connection
persistence issue you were having that problem try below snippet would
work as expected.
string connectionString = #"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\msm.mdf;Connect Timeout=30;Integrated Security=True;";
using (var _connection = new SqlConnection(connectionString))
{
_connection.Open();
using (SqlCommand command = new SqlCommand("Insert into [LocalTestTable] values (#name,#description)", _connection))
{
command.Parameters.AddWithValue("#name", "TestFlatName");
command.Parameters.AddWithValue("#description", "TestFlatDescription");
SqlDataReader sqlDataReader = command.ExecuteReader();
sqlDataReader.Close();
}
_connection.Close();
}
Hope that will resolve your problem without having anymore issue.
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();
}
Hello please help me out with this connection string and even my procedure properties are attached
try
{
conn = new SqlConnection("Server=RM-MOBL\MSSQLSERVER1;DataBase=master;Trusted_Connection=True;");
conn.Open();
SqlCommand cmd = new SqlCommand("dbo.new", conn);
cmd.CommandType = CommandType.StoredProcedure;
rdr = cmd.ExecuteReader();
Console.WriteLine(" connection success");
}
// I hope I have mentioned correct connection string but
// not able to execute my stored procedure
i am facing error
![please see error here ][3]
The above code might not be a best way to Connect the database.
In your web.config add these lines which will connect to your database inside <configuration> section
<connectionStrings >
<add name="myConnectionString" connectionString="Server=ServerName;Database=DatabaseName;User ID=UserId;Password=Password;Trusted_Connection=False;"
providerName="System.Data.SqlClient"/>
</connectionStrings>
And in your C# file add these references
using System.Data.SqlClient;
using System.Web.Configuration;
Inside Public Class add this Connection
SqlConnection con = new SqlConnection(WebConfigurationManager.ConnectionStrings["myConnectionString"].ConnectionString);
Now you can open the Connection by having con.Open();
Try this,if you are using local machine
SqlConnection con = new SqlConnection("Server=RANJITHM-OBL\MSSQLSERVER1;initial catalog=master;integrated security=true");
SqlCommand cmd = new SqlCommand("dbo.new", conn);
cmd.CommandType = CommandType.StoredProcedure;
if (con.State == ConnectionState.Closed)
con.Open();
rdr = cmd.ExecuteReader();
Console.WriteLine(" connection success");
This is my code
string connectionString = #"Provider=SQLOLEDB;Data Source=Machine Name;Initial Catalog=MyTestDatabase;";
OleDbConnection conn = new OleDbConnection(connectionString);
DataTable result = new DataTable();
try
{
conn.Open();
OleDbCommand cmd = new OleDbCommand("get_holidays", conn);
cmd.CommandType = CommandType.StoredProcedure;
OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);
adapter.Fill(result);
}
$exception {"Invalid authorization specification"} is thrown during
conn.open().
Connection string format:
Server=myServerAddress;Database=myDataBase;User ID=myUsername;Password=myPassword;Trusted_Connection=False;
or
Data Source=myServerAddress;Initial Catalog=myDataBase;Integrated Security=SSPI;
Add Integrated Security=SSPI to your connection string especially when username and password are not specified. In this case current Windows account credentials are used for authentication.
Provider=SQLOLEDB;Data Source=ServerName;Integrated Security=SSPI;Initial Catalog=databaseName
Try this connection string
Provider=SQLOLEDB;Data Source=Machine Name;Initial Catalog=MyTestDatabase;Integrated Security=SSPI
If will not work locally - then you have no access to your Sql Server
no username and password in connection string