SQLiteHelper封装类

 public  class SQLiteHelper
    {
        private static readonly string conStr = ConfigurationManager.AppSettings["SQLiteDbConn"].ToString()
        /// <summary>
        ///增、删、改
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <param name="pms">SQL参数</param>
        /// <returns>受影响的行数</returns>
        public static int Execute(string sql, params SQLiteParameter[] pms)
        {
            using (SQLiteConnection conn = new SQLiteConnection(conStr))
            {
                using (SQLiteCommand cmd = new SQLiteCommand(sql, conn))
                {
                    if (pms != null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    try
                    {
                        conn.Open();
                    }
                    catch
                    {
                        throw;
                    }
                    return cmd.ExecuteNonQuery();
                }
            }
        }

        /// <summary>
        /// 查询单个结果，一般和聚合函数 一起使用
        /// </summary>
        /// <param name="sql">查询的SQL语句</param>
        /// <param name="pms">SQL参数</param>
        /// <returns>返回查询对象，查询结果第一行第一列</returns>
        public static object ExecuteScalar(string sql, params SQLiteParameter[] pms)
        {
            using (SQLiteConnection conn = new SQLiteConnection(conStr))
            {
                using (SQLiteCommand cmd = new SQLiteCommand(sql, conn))
                {
                    if (pms != null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    try
                    {
                        conn.Open();
                    }
                    catch
                    {
                        throw;
                    }
                    return cmd.ExecuteScalar();
                }
            }

        }

        /// <summary>
        /// 查询多行
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <param name="pms">SQL参数</param>
        /// <returns>返回SqlDataReader对象</returns>
        public static SQLiteDataReader ExcuteReader(string sql, params SQLiteParameter[] pms)
        {
            SQLiteConnection sqliteConn = new SQLiteConnection(conStr);
            SQLiteCommand cmd = new SQLiteCommand{
                Connection = sqliteConn,
                CommandText = sql
            };
            if (pms != null)
                cmd.Parameters.AddRange(pms);
            if (sqliteConn.State != ConnectionState.Open)
                sqliteConn.Open();
            return cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }


    }

查询数据：

public object GetList()
        {
            List<UserLog> Logs = new List<UserLog>();
            string sqlStr = @"select Name from UserLog order by CareteTime desc limit 1";
            return SQLiteHelper.ExecuteScalar(sqlStr, null);
        }

public List<User> GetAll()
        {
            List<User> userlist = new List<User>();
            string sqlStr = @"select Gid,Phone,Name";
            SQLiteDataReader reader =SQLiteHelper.ExcuteReader(sqlStr, null);
            while (reader.Read())
            {
                User  item = new User();
                item.Gid = Guid.Parse(reader[0].ToString());
                item.Phone = reader[1].ToString();
                item.Name = reader[2].ToString();
                userlist.Add(item);
            }
            reader.Close();
            return userlist;
        }

保存数据
 public bool Save(user User)
        {
            string sqlStr = @"insert into User(Gid,Phone,Name) values (@Gid,@Phone,@Name)";
            SQLiteParameter[] parameters = {
                    new SQLiteParameter("@Gid", user.Gid),
                    new SQLiteParameter("@Phone", user.Phone),
                    new SQLiteParameter("@Name", user.Name),
            };
            return SQLiteHelper.Execute(sqlStr, parameters) > 0;
        }