C#•2mo ago

Trouble Connecting to Database

I'm using Dapper and SqlClient but I keep getting this error: Unhandled exception. Microsoft.Data.SqlClient.SqlException (0x80131904): 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: TCP Provider, error: 35 - An internal exception was caught) here is the code:

using System.Data;
using Dapper;
using Microsoft.Data.SqlClient;

namespace MacBlazor2
{
    public class DbHelper
    {
        private IDbConnection connection;

        public DbHelper() {
            connection = new SqlConnection("User ID=postgres;Password=password;Server=localhost:5432;Database=dvdrental;Pooling=true;Min Pool Size=0;Max Pool Size=100;Connection Lifetime=0;");
            Console.WriteLine(connection.Database);
            Console.WriteLine(connection.ConnectionString);
            foreach(Person p in connection.Query<Person>("SELECT actor_id, first_name, last_name FROM actor")) Console.WriteLine(p.first_name + " " + p.last_name);
        }

    }
}

using System.Data;
using Dapper;
using Microsoft.Data.SqlClient;

namespace MacBlazor2
{
    public class DbHelper
    {
        private IDbConnection connection;

        public DbHelper() {
            connection = new SqlConnection("User ID=postgres;Password=password;Server=localhost:5432;Database=dvdrental;Pooling=true;Min Pool Size=0;Max Pool Size=100;Connection Lifetime=0;");
            Console.WriteLine(connection.Database);
            Console.WriteLine(connection.ConnectionString);
            foreach(Person p in connection.Query<Person>("SELECT actor_id, first_name, last_name FROM actor")) Console.WriteLine(p.first_name + " " + p.last_name);
        }

    }
}

11 Replies

Adam•2mo ago

the port is running and I can connect through the terminal to localhost:5432 using that login

Angius•2mo ago

See how the error mentions "SQL Server" everywhere? Your database seems to be PostgreSQL

Adam•2mo ago

but how does it get the port then

Angius•2mo ago

Adam•2mo ago

like how does it connect if it doesn't know the address of the server

Angius•2mo ago

Well that's the problem It does not connect

Jimmacle•2mo ago

you need to use Npgsql, not Microsoft.Data.SqlClient

Angius•2mo ago

You need the Npgsql nuget and use NpgsqlConnection instead of SqlConnection

Adam•2mo ago

Jimmacle•2mo ago

the ADO.NET providers are database specific

Adam•2mo ago

I see my bad I'll try that out then

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Trouble Connecting to Database