在c#中使用sqlite3

using System;
using System.Data.SQLite;
using System.IO;
using System.Data;
using System.Linq;

namespace sqlite3
{
    class Program
    {
        static string path = @"./test.sqlite";
        static SQLiteConnection connection = null;

        static void CreateDB()
        {
            connection = new SQLiteConnection("data source = " + path);
            connection.Open();
            connection.Close();
        }

        static void CreateTable()
        {
            connection.Open();

            // create table
            SQLiteCommand command = connection.CreateCommand();
            command.CommandText = "CREATE TABLE IF NOT EXISTS t1(id varchar(4), score int)";
            command.ExecuteNonQuery();

            // insert into some data
            Random random = new Random();
            for (int i = 0; i < 100; i++)
            {
                command.CommandText = string.Format("insert into t1(id, score) values({0}, {1})",  i+1, random.Next());
                command.ExecuteNonQuery();

                Console.Clear();
                Console.WriteLine("wrote {0} items", i + 1);
            }

            connection.Close();
        }

        static void DeleteDB()
        {
            if (File.Exists(path))
            {
                File.Delete(path);
            }
        }

        static void QueryDB()
        {
            connection.Open();

            // query the rows
            SQLiteCommand command = connection.CreateCommand();
            command.CommandText = "select * from t1 limit 10";

            SQLiteDataAdapter adapter = new SQLiteDataAdapter(command);
            DataTable table = new DataTable();
            adapter.Fill(table);

            foreach(DataRow row in table.Rows)
            {
                Console.WriteLine($"id: {row["id"]} score: {row["score"]}");
            }

            // get the rows‘ count
            command.CommandText = "select count(*) from t1";
            Int64 cnt = (Int64)command.ExecuteScalar();
            Console.WriteLine($"table t1 has {cnt} rows");

            connection.Close();
        }

        static void Main(string[] args)
        {
            DeleteDB();
            CreateDB();
            CreateTable();
            QueryDB();

            Console.ReadKey();
        }
    }
}