DuckDB C#（對開發者如何理解的工作）

dotnet add package DuckDB.NET.Data.Full

using System;
using DuckDB.NET.Data;

class Program
{
    static void Main()
    {
        // Create and open a connection to an in-memory DuckDB database
        using var duckdbconnection = new DuckDBConnection("Data Source=:memory:");
        duckdbconnection.Open();

        // Create a command associated with the connection
        using var command = duckdbconnection.CreateCommand();
        // Create a table named 'integers'
        command.CommandText = "CREATE TABLE integers(foo INTEGER, bar INTEGER);";
        command.ExecuteNonQuery();

        // Insert some data into the 'integers' table
        command.CommandText = "INSERT INTO integers VALUES (3, 4), (5, 6), (7, 8);";
        command.ExecuteNonQuery();

        // Retrieve the count of rows in the 'integers' table
        command.CommandText = "SELECT count(*) FROM integers";
        var executeScalar = command.ExecuteScalar();

        // Select all values from the 'integers' table
        command.CommandText = "SELECT foo, bar FROM integers;";

        // Execute the query and process the results
        using var reader = command.ExecuteReader();
        while (reader.Read())
        {
            Console.WriteLine($"{reader.GetInt32(0)}, {reader.GetInt32(1)}");
        }
    }
}

Imports System
Imports DuckDB.NET.Data

Friend Class Program
	Shared Sub Main()
		' Create and open a connection to an in-memory DuckDB database
		Dim duckdbconnection As New DuckDBConnection("Data Source=:memory:")
		duckdbconnection.Open()

		' Create a command associated with the connection
		Dim command = duckdbconnection.CreateCommand()
		' Create a table named 'integers'
		command.CommandText = "CREATE TABLE integers(foo INTEGER, bar INTEGER);"
		command.ExecuteNonQuery()

		' Insert some data into the 'integers' table
		command.CommandText = "INSERT INTO integers VALUES (3, 4), (5, 6), (7, 8);"
		command.ExecuteNonQuery()

		' Retrieve the count of rows in the 'integers' table
		command.CommandText = "SELECT count(*) FROM integers"
		Dim executeScalar = command.ExecuteScalar()

		' Select all values from the 'integers' table
		command.CommandText = "SELECT foo, bar FROM integers;"

		' Execute the query and process the results
		Dim reader = command.ExecuteReader()
		Do While reader.Read()
			Console.WriteLine($"{reader.GetInt32(0)}, {reader.GetInt32(1)}")
		Loop
	End Sub
End Class

command.CommandText = "COPY integers FROM 'example.csv' (FORMAT CSV);";
command.ExecuteNonQuery();

IRON VB CONVERTER ERROR developers@ironsoftware.com

using IronPdf;

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();

        // 1. Convert HTML String to PDF
        var htmlContent = "<h1>Hello, IronPDF!</h1><p>This is a PDF from an HTML string.</p>";
        var pdfFromHtmlString = renderer.RenderHtmlAsPdf(htmlContent);
        pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf");

        // 2. Convert HTML File to PDF
        var htmlFilePath = "path_to_your_html_file.html"; // Specify the path to your HTML file
        var pdfFromHtmlFile = renderer.RenderHtmlFileAsPdf(htmlFilePath);
        pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf");

        // 3. Convert URL to PDF
        var url = "http://ironpdf.com"; // Specify the URL
        var pdfFromUrl = renderer.RenderUrlAsPdf(url);
        pdfFromUrl.SaveAs("URLToPDF.pdf");
    }
}

Imports IronPdf

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		Dim renderer = New ChromePdfRenderer()

		' 1. Convert HTML String to PDF
		Dim htmlContent = "<h1>Hello, IronPDF!</h1><p>This is a PDF from an HTML string.</p>"
		Dim pdfFromHtmlString = renderer.RenderHtmlAsPdf(htmlContent)
		pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf")

		' 2. Convert HTML File to PDF
		Dim htmlFilePath = "path_to_your_html_file.html" ' Specify the path to your HTML file
		Dim pdfFromHtmlFile = renderer.RenderHtmlFileAsPdf(htmlFilePath)
		pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf")

		' 3. Convert URL to PDF
		Dim url = "http://ironpdf.com" ' Specify the URL
		Dim pdfFromUrl = renderer.RenderUrlAsPdf(url)
		pdfFromUrl.SaveAs("URLToPDF.pdf")
	End Sub
End Class

using DuckDB.NET.Data;
using IronPdf;

namespace CodeSample
{
    public static class DuckDbDemo
    {
        public static void Execute()
        {
            // Instantiate Renderer
            var renderer = new ChromePdfRenderer();
            var content = "<h1>Demo DuckDb and IronPDF</h1>";
            content += "<h2>Create DuckDBConnection</h2>";
            content += "<p>new DuckDBConnection(\"Data Source=:memory:\");</p>";
            content += "<p></p>";

            // Create and open a connection to an in-memory DuckDB database
            using var connection = new DuckDBConnection("Data Source=:memory:");
            connection.Open();
            using var command = connection.CreateCommand();

            // Create a table named 'integers'
            command.CommandText = "CREATE TABLE integers(book STRING, cost INTEGER);";
            command.ExecuteNonQuery();
            content += "<p>CREATE TABLE integers(book STRING, cost INTEGER);</p>";

            // Insert some data into the 'integers' table
            command.CommandText = "INSERT INTO integers VALUES ('book1', 25), ('book2', 30), ('book3', 10);";
            command.ExecuteNonQuery();
            content += "<p>INSERT INTO integers VALUES ('book1', 25), ('book2', 30), ('book3', 10);</p>";

            // Select all values from the 'integers' table
            command.CommandText = "SELECT book, cost FROM integers;";
            using var reader = command.ExecuteReader();
            content += "<p>SELECT book, cost FROM integers;</p>";

            // Execute the query and process the results, appending them to the HTML content
            while (reader.Read())
            {
                content += $"<p>{reader.GetString(0)}, {reader.GetInt32(1)}</p>";
                Console.WriteLine($"{reader.GetString(0)}, {reader.GetInt32(1)}");
            }

            // Save data to CSV
            content += "<p>Save data to CSV with COPY integers TO 'output.csv' (FORMAT CSV);</p>";
            command.CommandText = "COPY integers TO 'output.csv' (FORMAT CSV);";
            command.ExecuteNonQuery();

            // Generate and save PDF
            var pdf = renderer.RenderHtmlAsPdf(content);
            pdf.SaveAs("AwesomeDuckDbNet.pdf");
        }
    }
}

Imports DuckDB.NET.Data
Imports IronPdf

Namespace CodeSample
	Public Module DuckDbDemo
		Public Sub Execute()
			' Instantiate Renderer
			Dim renderer = New ChromePdfRenderer()
			Dim content = "<h1>Demo DuckDb and IronPDF</h1>"
			content &= "<h2>Create DuckDBConnection</h2>"
			content &= "<p>new DuckDBConnection(""Data Source=:memory:"");</p>"
			content &= "<p></p>"

			' Create and open a connection to an in-memory DuckDB database
			Dim connection = New DuckDBConnection("Data Source=:memory:")
			connection.Open()
			Dim command = connection.CreateCommand()

			' Create a table named 'integers'
			command.CommandText = "CREATE TABLE integers(book STRING, cost INTEGER);"
			command.ExecuteNonQuery()
			content &= "<p>CREATE TABLE integers(book STRING, cost INTEGER);</p>"

			' Insert some data into the 'integers' table
			command.CommandText = "INSERT INTO integers VALUES ('book1', 25), ('book2', 30), ('book3', 10);"
			command.ExecuteNonQuery()
			content &= "<p>INSERT INTO integers VALUES ('book1', 25), ('book2', 30), ('book3', 10);</p>"

			' Select all values from the 'integers' table
			command.CommandText = "SELECT book, cost FROM integers;"
			Dim reader = command.ExecuteReader()
			content &= "<p>SELECT book, cost FROM integers;</p>"

			' Execute the query and process the results, appending them to the HTML content
			Do While reader.Read()
				content &= $"<p>{reader.GetString(0)}, {reader.GetInt32(1)}</p>"
				Console.WriteLine($"{reader.GetString(0)}, {reader.GetInt32(1)}")
			Loop

			' Save data to CSV
			content &= "<p>Save data to CSV with COPY integers TO 'output.csv' (FORMAT CSV);</p>"
			command.CommandText = "COPY integers TO 'output.csv' (FORMAT CSV);"
			command.ExecuteNonQuery()

			' Generate and save PDF
			Dim pdf = renderer.RenderHtmlAsPdf(content)
			pdf.SaveAs("AwesomeDuckDbNet.pdf")
		End Sub
	End Module
End Namespace

IronPdf.License.LicenseKey = "IRONPDF-KEY";

IRON VB CONVERTER ERROR developers@ironsoftware.com