How to connect PostgreSQL with VB.NET Application

Connecting PostgreSQL with a VB.NET application involves several steps. Follow these instructions to establish a connection and perform basic operations:

1. Installing ODBC Driver

Begin by installing the ODBC driver for PostgreSQL. You can download it from the official PostgreSQL website.

Once the installation is complete, you can proceed with connecting to the PostgreSQL database.

2. Connecting to PostgreSQL using ODBC

To establish a connection to the PostgreSQL database using ODBC in VB.NET, follow these steps:

Dim MyCon As New Odbc.OdbcConnection
MyCon.ConnectionString = "Driver={PostgreSQL ANSI};database=database_name;server=127.0.0.1;port=5432;uid=postgres;sslmode=disable;readonly=0;protocol=7.4;User ID=postgres;password=password;"

MyCon.Open()
        If mCon.State = ConnectionState.Open Then
            MsgBox("Connected To PostGres", MsgBoxStyle.MsgBoxSetForeground)
        End If

This code snippet demonstrates how to create a connection object and establish a connection using the specified connection string.

3. Using Npgsql for PostgreSQL Connectivity in VB.NET

Npgsql is a popular library for connecting to PostgreSQL from .NET applications. To use Npgsql, you can follow these steps:

    Public cn As NpgsqlConnection

    Private Sub OpenDataBase()
        Dim cs As String 'ConnectionString

        cs = "Server=127.0.0.1:5434;Database=extraits;Userid=postgres;Password='********'"

        cn = New NpgsqlConnection(cs)
        Try
            cn.Open()
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try

        Dim sSQL = "SELECT version()"
        Dim cmd As New NpgsqlCommand(sSQL, cn)
        Dim dr As NpgsqlDataReader
        dr = cmd.ExecuteReader()
        dr.Read()
        Dim sVersion As String = dr.Item(0)
        Console.WriteLine("PostgreSQL VERSION: " & sVersion)
        dr.Close()
    End Sub

This code snippet showcases how to establish a connection to a PostgreSQL database using Npgsql and retrieve data from the database.

These examples provide a starting point for connecting to a PostgreSQL database using both ODBC and Npgsql in VB.NET. You can adapt and modify the code according to your specific requirements.