最近有WPF做客户端，需要离线操作存储数据，在项目中考虑使用Sqlite嵌入式数据库，在网上找了不少资料，最终整理出一个公共的帮助类。

Sqlite是一个非常小巧的数据库，基本上具备关系型数据库操作的大多数功能，Sql语法也大同小异。下面是我整理的帮助类代码：

1.获取 SQLiteConnection 对象，传入数据库有地址即可。

   /// <summary>
        /// 获得连接对象
        /// </summary>
        /// <returns>SQLiteConnection</returns>
        public static SQLiteConnection GetSQLiteConnection()
        {
            //Sqlite数据库地址
            string str = AppDomain.CurrentDomain.BaseDirectory;
            var con = new SQLiteConnection("Data Source=" + str + "DataBass\\InfoServiceDbB.db");
            return con;
        }

 2.准备操作命令参数，构造SQLiteCommand 对象：

 

/// <summary>
        /// 准备操作命令参数
        /// </summary>
        /// <param name="cmd">SQLiteCommand</param>
        /// <param name="conn">SQLiteConnection</param>
        /// <param name="cmdText">Sql命令文本</param>
        /// <param name="data">参数数组</param>
        private static void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, string cmdText, Dictionary<String, String> data)
        {
            if (conn.State != ConnectionState.Open)
                conn.Open();
            cmd.Parameters.Clear();
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            cmd.CommandType = CommandType.Text;
            cmd.CommandTimeout = 30;
            if (data!=null&&data.Count >= 1)
            {
                foreach (KeyValuePair<String, String> val in data)
                {
                    cmd.Parameters.AddWithValue(val.Key, val.Value);
                }
            }
        }

3.查询，返回DataSet

/// <summary>
        /// 查询，返回DataSet
        /// </summary>
        /// <param name="cmdText">Sql命令文本</param>
        /// <param name="data">参数数组</param>
        /// <returns>DataSet</returns>
        public static DataSet ExecuteDataset(string cmdText, Dictionary<string, string> data)
        {
            var ds = new DataSet();
            using (SQLiteConnection connection = GetSQLiteConnection())
            {
                var command = new SQLiteCommand();
                PrepareCommand(command, connection, cmdText, data);
                var da = new SQLiteDataAdapter(command);
                da.Fill(ds);
            }
            return ds;
        }

4.查询，返回DataTable

/// <summary>
        /// 查询，返回DataTable
        /// </summary>
        /// <param name="cmdText">Sql命令文本</param>
        /// <param name="data">参数数组</param>
        /// <returns>DataTable</returns>
        public static DataTable ExecuteDataTable(string cmdText, Dictionary<string, string> data)
        {
            var dt = new DataTable();
            using (SQLiteConnection connection = GetSQLiteConnection())
            {
                var command = new SQLiteCommand();
                PrepareCommand(command, connection, cmdText, data);
                SQLiteDataReader reader = command.E