PetaPoco与SQLite

（1）==数据库配置文件

  <!--数据库配置-->
  <appSettings>
    <!--SQLite-->
    <add key="SQLString" value="~\App_Data\OldDemo.db"/>
    <add key="SQLString2" value="|DataDirectory|OldDemo.db"/>
  </appSettings>

（2）配置类
class Config
    {
        public static string DatabaseFile = "";
        public static string DataSource
        {
            get
            {
                return string.Format("data source={0}", ConfigurationManager.AppSettings["SQLString2"]);
            }
        }
    }

（3）==BaseServices类

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SQLite;
using System.Linq;
using System.Runtime.Remoting.Messaging;
using System.Text;
using App.Core.Constant;
using PetaPoco;

namespace App.Core.Service
{
    public abstract class BaseService
    {
        private IDbConnection connection;

        public BaseService()
        {
            connection = new SQLiteConnection(Config.DataSource);
        }

        /// <summary>
        /// 查询所有对象
        /// </summary>
        /// <typeparam name="T">泛型对象</typeparam>
        /// <returns></returns>
        public List<T> Query<T>()
        {
            var list = new List<T>();
            try
            {
                string className = typeof(T).ToString();

                var db = new Database(connection);
                string name = className.Substring(
                    className.LastIndexOf(‘.‘) + 1,
                    className.Length - className.LastIndexOf(‘.‘) - 1);

                connection.Open();

                list = db.Fetch<T>(string.Format("select * from {0} ", name));
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return list;
        }

        /// <summary>
        /// 删除对象
        /// </summary>
        /// <typeparam name="T">泛型对象</typeparam>
        /// <param name="objData"></param>
        /// <returns></returns>
        public int Delete<T>(object objData)
        {
            var result = 0;
            try
            {
                var db = new Database(connection);
                connection.Open();
                result = db.Delete<T>(objData);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return result;
        }

        /// <summary>
        /// 添加一条记录
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="objData"></param>
        /// <returns></returns>
        public T Add<T>(object objData)
        {
            T result;
            try
            {
                var db = new Database(connection);
                connection.Open();
                result = (T)Convert.ChangeType(db.Insert(objData), typeof(T));
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return result;
        }
    }
}