SQLite multiple threads

const int loops = 1000;

public void DatabaseThreadSafetyTest()
{
    var backgroundThread = new Thread(new System.Threading.ThreadStart(() =>
    {
        for (int i = 1; i <= loops; i++)
        {
            Console.WriteLine("Background thread loop " + i);
            using (var db = new SQLiteConnection(DbPath, SQLiteOpenFlags.ReadWrite | SQLiteOpenFlags.Create | SQLiteOpenFlags.SharedCache)) {
                db.Insert (new MyClass());
            }
        }
    }));
    backgroundThread.Start();

    for (int i = 1; i <= loops; i++)
    {
        Console.WriteLine("Main thread loop " + i);
        using (var db = new SQLiteConnection(DbPath, SQLiteOpenFlags.ReadWrite | SQLiteOpenFlags.Create | SQLiteOpenFlags.SharedCache)) {
            db.Insert (new MyClass());
        }
    }
}

　

using System;
using System.Data.SQLite;
using System.Threading.Tasks;

namespace SQLiteTest
{
    class Program
    {
        static void Main(string[] args)
        {
            var tasks = new Task[100];

            for (int i = 0; i < 100; i++)
            {
                tasks[i] = new Task(new Program().WriteToDB);
                tasks[i].Start();
            }

            foreach (var task in tasks)
                task.Wait();
        }

        public void WriteToDB()
        {
            try
            {
                using (SQLiteConnection myconnection = new SQLiteConnection(@"Data Source=c:123.db"))
                {
                    myconnection.Open();
                    using (SQLiteTransaction mytransaction = myconnection.BeginTransaction())
                    {
                        using (SQLiteCommand mycommand = new SQLiteCommand(myconnection))
                        {
                            Guid id = Guid.NewGuid();

                            mycommand.CommandText = "INSERT INTO Categories(ID, Name) VALUES ('" + id.ToString() + "', '111')";
                            mycommand.ExecuteNonQuery();

                            mycommand.CommandText = "UPDATE Categories SET Name='222' WHERE ID='" + id.ToString() + "'";
                            mycommand.ExecuteNonQuery();

                            mycommand.CommandText = "DELETE FROM Categories WHERE ID='" + id.ToString() + "'";
                            mycommand.ExecuteNonQuery();
                        }
                        mytransaction.Commit();
                    }
                }
            }
            catch (SQLiteException ex)
            {
                if (ex.ReturnCode == SQLiteErrorCode.Busy)
                    Console.WriteLine("Database is locked by another process!");
            }
        }
    }
}