sqlite数据库的使用helper

public class SQLiteHelper

    {

        //public static String ConnectionString = "Data Source=H:/SQLite/DB/minWeiGanBu.db;Pooling=true;FailIfMissing=false";

        //public static String ConnectionString = "Data Source=H:/SQLite/DB/aid/minWeiGanBu.db;Pooling=true;FailIfMissing=false";

        static string ConnectionString = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString.ToString().Replace("|path|",Tools.binPath + @"\DB");

 

        private static void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, string cmdText, params SQLiteParameter[] p)

        {

            if (conn.State != ConnectionState.Open)

                conn.Open();

            cmd.Parameters.Clear();

            cmd.Connection = conn;

            cmd.CommandText = cmdText;

            cmd.CommandType = CommandType.Text;

            cmd.CommandTimeout = 30;

            if (p != null)

            {

                foreach (object parm in p)

                    //cmd.Parameters.AddWithValue(string.Empty, parm);

                    cmd.Parameters.Add(parm);

            }

        }

        public static DataSet ExecuteQuery(string cmdText, params SQLiteParameter[] p)

        {

            using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))

            {

                using (SQLiteCommand command = new SQLiteCommand())

                {

                    DataSet ds = new DataSet();

                    PrepareCommand(command, conn, cmdText, p);

                    SQLiteDataAdapter da = new SQLiteDataAdapter(command);

                    da.Fill(ds);

                    return ds;

                }

            }

        }

        public static int ExecuteNonQuery(string cmdText, params SQLiteParameter[] p)

        {

            using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))

            {

                using (SQLiteCommand command = new SQLiteCommand())

                {

                    PrepareCommand(command, conn, cmdText, p);

                    return command.ExecuteNonQuery();

                }

            }

        }

 

        public static SQLiteDataReader ExecuteReader(string cmdText, params SQLiteParameter[] p)

        {

            //using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))

            //{

               SQLiteConnection conn = new SQLiteConnection(ConnectionString);

                using (SQLiteCommand command = new SQLiteCommand())

                {

                    PrepareCommand(command, conn, cmdText, p);

                    return command.ExecuteReader(CommandBehavior.CloseConnection);

                }

            //}         

        }

 

        public static object ExecuteScalar(string cmdText, params SQLiteParameter[] p)

        {

            using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))

            {

                using (SQLiteCommand command = new SQLiteCommand())

                {

                    PrepareCommand(command, conn, cmdText, p);

                    return command.ExecuteScalar();

                }

            }

        }

    }