Hl.DataDbHelper/DbUlitity.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;

namespace Hl.DataDbHelper
{
    public abstract class DbUlitity
    {
        #region "字段"

        /// <summary>
        /// 数据库类型
        /// </summary>
        private static string  _mDbType = ConfigurationManager.AppSettings["DbType"];

        /// <summary>
        /// 
        /// </summary>
        private static DbHelper _mDbHelper = null;

        /// <summary>
        /// 
        /// </summary>
        private static object _mPadLocking = new object();

        #endregion

        #region "数据库单态实现"

        /// <summary>
        /// 实例数据访问抽象层
        /// </summary>
        private static void CreateDb()
        {
            switch (_mDbType)
            {
                case "SqlServer":
                    _mDbHelper = new DbHelperSql();
                    break;
                default:
                    throw new ApplicationException("数据库配置不对！");
            }
        }

        /// <summary>
        /// 实例数据访问抽象层
        /// </summary>
        public static DbHelper Instance()
        {
            if (_mDbHelper == null)
            {
                lock (_mPadLocking)
                {
                    if (_mDbHelper == null)
                    {
                        CreateDb();
                    }
                }
            }