ConsoleTest/SqliteTest.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Data.Sqlite;

namespace ConsoleTest
{
    internal class SqliteTest
    {
        static SqliteConnection connection;
        static SqliteTest() 
        {
            connection = new SqliteConnection("Data Source=./test.db");
        }


        public SqliteTest() 
        {
            string sql = @"
                        CREATE TABLE IF NOT EXISTS Users(
                            [Id] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
                            [Username] NVARCHAR(64) NOT NULL,
                            [Email] NVARCHAR(128) NOT NULL,
                            [Password] NVARCHAR(128) NOT NULL
                        )";
            OpenConnection();
            this.ExecuteNonQuery(sql);
        }

        // Transaction Demo
        public void InsertMultipleWithTransaction(int length)
        {
            OpenConnection();
            var transaction = connection.BeginTransaction();

            try
            {
                Parallel.For(0, length,new ParallelOptions { MaxDegreeOfParallelism = 1 }, index =>
                {
                    string sql = $@"INSERT INTO Users(Username, Email, Password)
                            VALUES('admin{index}', 'testing{index}@gmail.com', 'test{index}')";

                    this.ExecuteNonQuery(sql);
                });

                transaction.Commit();
            }
            catch (Exception ex)

            {
                Console.WriteLine(ex.ToString());
                transaction.Rollback();
            }
            finally
            {
                transaction.Dispose();
            }
        }