Npgsql C# (Cómo Funciona para Desarrolladores)

1.1 Advantages of using Npgsql

Performance: The speed and efficiency of Npgsql are built-in. To guarantee optimal speed when working with PostgreSQL databases, it makes use of capabilities like batching commands, asynchronous input/output, and optimized data types.

Complete PostgreSQL Support: The goal of Npgsql is to offer complete support for all PostgreSQL functionalities, such as arrays, JSONB, advanced data types, and user-defined types. This implies that programmers can leverage PostgreSQL's full potential in their .NET applications.

1.2 Getting Started with Npgsql

using Npgsql;
using System;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        // PostgreSQL connection string
        string connString = "Host=myServerAddress;Port=myPort;Username=myUsername;Password=myPassword;Database=myDatabase";

        // Create connection object
        using (var conn = new NpgsqlConnection(connString))
        {
            // Open the connection
            await conn.OpenAsync();

            // SQL query to execute
            string sql = "SELECT * FROM myTable";

            // Create NpgsqlCommand
            using (var cmd = new NpgsqlCommand(sql, conn))
            {
                // Execute the command and retrieve data
                using (var reader = await cmd.ExecuteReaderAsync())
                {
                    // Loop through the retrieved data
                    while (await reader.ReadAsync())
                    {
                        // Retrieve data from the data reader
                        string name = reader["Name"].ToString();
                        int age = Convert.ToInt32(reader["Age"]);
                        // Output retrieved data to console
                        Console.WriteLine($"Name: {name}, Age: {age}");
                    }
                }
            }
            // Connection will be automatically closed here due to the 'using' block
        }
    }
}

using Npgsql;
using System;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        // PostgreSQL connection string
        string connString = "Host=myServerAddress;Port=myPort;Username=myUsername;Password=myPassword;Database=myDatabase";

        // Create connection object
        using (var conn = new NpgsqlConnection(connString))
        {
            // Open the connection
            await conn.OpenAsync();

            // SQL query to execute
            string sql = "SELECT * FROM myTable";

            // Create NpgsqlCommand
            using (var cmd = new NpgsqlCommand(sql, conn))
            {
                // Execute the command and retrieve data
                using (var reader = await cmd.ExecuteReaderAsync())
                {
                    // Loop through the retrieved data
                    while (await reader.ReadAsync())
                    {
                        // Retrieve data from the data reader
                        string name = reader["Name"].ToString();
                        int age = Convert.ToInt32(reader["Age"]);
                        // Output retrieved data to console
                        Console.WriteLine($"Name: {name}, Age: {age}");
                    }
                }
            }
            // Connection will be automatically closed here due to the 'using' block
        }
    }
}

Imports Npgsql
Imports System
Imports System.Threading.Tasks

Friend Class Program
	Shared Async Function Main(ByVal args() As String) As Task
		' PostgreSQL connection string
		Dim connString As String = "Host=myServerAddress;Port=myPort;Username=myUsername;Password=myPassword;Database=myDatabase"

		' Create connection object
		Using conn = New NpgsqlConnection(connString)
			' Open the connection
			Await conn.OpenAsync()

			' SQL query to execute
			Dim sql As String = "SELECT * FROM myTable"

			' Create NpgsqlCommand
			Using cmd = New NpgsqlCommand(sql, conn)
				' Execute the command and retrieve data
				Using reader = Await cmd.ExecuteReaderAsync()
					' Loop through the retrieved data
					Do While Await reader.ReadAsync()
						' Retrieve data from the data reader
						Dim name As String = reader("Name").ToString()
						Dim age As Integer = Convert.ToInt32(reader("Age"))
						' Output retrieved data to console
						Console.WriteLine($"Name: {name}, Age: {age}")
					Loop
				End Using
			End Using
			' Connection will be automatically closed here due to the 'using' block
		End Using
	End Function
End Class

2.1 Parameterized Queries With PostgreSQL

Because parameterized queries enable the database server to cache query plans, they enhance query performance and help prevent SQL injection attacks. Npgsql supports parameterized queries. Additionally, working with dynamic SQL queries in a secure and effective manner is made easier with parameterized queries.

2.2 Bulk Operations with PostgreSQL

When working with huge datasets, the bulk insert, update, and delete actions supported by Npgsql can greatly enhance speed. The overhead of making separate round trips to the database server is decreased when several rows may be processed in a single database transaction thanks to bulk operations.

Transactions With PostgreSQL

Transactions are supported by Npgsql, which enables the grouping of several database operations into a single atomic unit. Transactions provide data consistency and integrity by either committing all changes to the database or rolling back the entire transaction in the event of a mistake.

2.3 Performance Optimization with PostgreSQL

When working with PostgreSQL databases, Npgsql offers a number of performance enhancements, including query plan caching, result streaming, and command batching, to reduce latency and increase throughput. The scalability and general speed of the application are enhanced by these enhancements.

2.4 Connection with PostgreSQL Database

The PostgreSQL database server can be easily connected with the help of the Npgsql with a few lines of code below.

NpgsqlConnection conn = new NpgsqlConnection(connString);

NpgsqlConnection conn = new NpgsqlConnection(connString);

Dim conn As New NpgsqlConnection(connString)

This basic code snippet helps us to connect with the PostgreSQL database server.

3.1 Using Npgsql and IronPDF Together

Exciting possibilities arise when Npgsql and IronPDF are used together in a C# project. Although Npgsql is a great tool for working with PostgreSQL, IronPDF is a great tool for turning this content into PDFs. Thanks to this connectivity, programmers may design apps that can communicate with databases and have the ability to turn this content into PDFs.

3.2 Getting PostgreSQL Data with IronPDF

Users can interact with the database within your application by building a Windows console application that uses Npgsql. Add database access to your application first. There should be enough room on the console for this control, leaving plenty of room for DB interactions. Include data type mapping and bulk operations as well.

Install IronPDF

• Launch the project in Visual Studio.

• Select "Tools" > "NuGet Package Manager" > "Package Manager Console".

  • Enter the following command in the Package Manager Console and hit Enter:

  Install-Package IronPdf

• Alternatively, you can also install IronPDF by using NuGet Package Manager for Solutions.
  • Find the IronPDF package in the search results, select it, then click on the "Install" button. Visual Studio will handle the download and installation automatically.

• The IronPDF package will be downloaded and installed by NuGet along with any dependencies needed for your project.
• Following installation, you may begin utilizing IronPDF in your project.

Install Through the NuGet Website

For more information about IronPDF, including features, compatibility, and other download choices, go to the IronPDF package on NuGet website.

Utilize DLL to Install

As an alternative, you can use IronPDF's DLL file to integrate it straight into your project. Use this IronPDF ZIP package link to download the ZIP file containing the DLL. After unzipping it, add the DLL to your project.

Implementing the Logic

When we start running the application, it will fetch the data from the database using the Npgsql .NET library. With the help of IronPDF, we are able to convert the database content into a PDF document.

1. Getting Data: Get the most recent content from the Npgsql .NET provider when the user starts the conversion.
2. Generate PDF with IronPDF: To convert the data from the Npgsql database into a PDF, use IronPDF. The HTML string can be formatted into a PDF document using the HtmlToPdf class.
3. Save PDF and Notify: Either save the produced PDF to a specified location or leave a message visible on the console. Notify the user—possibly via a terminal message—that the conversion was successful once the PDF has been saved.

using Npgsql;
using IronPdf;
using System;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        // StringBuilder for HTML content
        StringBuilder sb = new StringBuilder();
        var Renderer = new ChromePdfRenderer(); // Instantiates Chrome Renderer

        sb.Append("<h1>Dynamic PDF Generated from PostgreSQL Data</h1>");

        // PostgreSQL connection setup
        string connString = "Host=myServerAddress;Port=myPort;Username=myUsername;Password=myPassword;Database=myDatabase";

        using (var conn = new NpgsqlConnection(connString))
        {
            await conn.OpenAsync();

            string sql = "SELECT * FROM myTable";
            using (var cmd = new NpgsqlCommand(sql, conn))
            {
                using (var reader = await cmd.ExecuteReaderAsync())
                {
                    while (await reader.ReadAsync())
                    {
                        // Retrieve data from the data reader
                        string name = reader["Name"].ToString();
                        int age = Convert.ToInt32(reader["Age"]);

                        // Add data to the PDF
                        sb.Append($"<p>Name: {name}, Age: {age}</p>");
                    }
                }
            }

            // Generate and save the PDF document
            var pdf = Renderer.RenderHtmlAsPdf(sb.ToString());
            pdf.SaveAs("output.pdf");

            // Connection will be automatically closed here
        }

        Console.WriteLine("PDF generation completed. See output.pdf for results.");
    }
}

using Npgsql;
using IronPdf;
using System;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        // StringBuilder for HTML content
        StringBuilder sb = new StringBuilder();
        var Renderer = new ChromePdfRenderer(); // Instantiates Chrome Renderer

        sb.Append("<h1>Dynamic PDF Generated from PostgreSQL Data</h1>");

        // PostgreSQL connection setup
        string connString = "Host=myServerAddress;Port=myPort;Username=myUsername;Password=myPassword;Database=myDatabase";

        using (var conn = new NpgsqlConnection(connString))
        {
            await conn.OpenAsync();

            string sql = "SELECT * FROM myTable";
            using (var cmd = new NpgsqlCommand(sql, conn))
            {
                using (var reader = await cmd.ExecuteReaderAsync())
                {
                    while (await reader.ReadAsync())
                    {
                        // Retrieve data from the data reader
                        string name = reader["Name"].ToString();
                        int age = Convert.ToInt32(reader["Age"]);

                        // Add data to the PDF
                        sb.Append($"<p>Name: {name}, Age: {age}</p>");
                    }
                }
            }

            // Generate and save the PDF document
            var pdf = Renderer.RenderHtmlAsPdf(sb.ToString());
            pdf.SaveAs("output.pdf");

            // Connection will be automatically closed here
        }

        Console.WriteLine("PDF generation completed. See output.pdf for results.");
    }
}

Imports Npgsql
Imports IronPdf
Imports System
Imports System.Text
Imports System.Threading.Tasks

Friend Class Program
	Shared Async Function Main(ByVal args() As String) As Task
		' StringBuilder for HTML content
		Dim sb As New StringBuilder()
		Dim Renderer = New ChromePdfRenderer() ' Instantiates Chrome Renderer

		sb.Append("<h1>Dynamic PDF Generated from PostgreSQL Data</h1>")

		' PostgreSQL connection setup
		Dim connString As String = "Host=myServerAddress;Port=myPort;Username=myUsername;Password=myPassword;Database=myDatabase"

		Using conn = New NpgsqlConnection(connString)
			Await conn.OpenAsync()

			Dim sql As String = "SELECT * FROM myTable"
			Using cmd = New NpgsqlCommand(sql, conn)
				Using reader = Await cmd.ExecuteReaderAsync()
					Do While Await reader.ReadAsync()
						' Retrieve data from the data reader
						Dim name As String = reader("Name").ToString()
						Dim age As Integer = Convert.ToInt32(reader("Age"))

						' Add data to the PDF
						sb.Append($"<p>Name: {name}, Age: {age}</p>")
					Loop
				End Using
			End Using

			' Generate and save the PDF document
			Dim pdf = Renderer.RenderHtmlAsPdf(sb.ToString())
			pdf.SaveAs("output.pdf")

			' Connection will be automatically closed here
		End Using

		Console.WriteLine("PDF generation completed. See output.pdf for results.")
	End Function
End Class

Below is the result generated from the above code. To know more about the IronPDF documentation refer to the guide.