Conris.Utility/DbHelperSqlServerCe.cs

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using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Configuration;
using System.Data.Common;
using System.Collections.Generic;
using System.Data.SqlServerCe;


namespace Conris.Utility
{
    public abstract class DbHelperSqlServerCe
    {


        //数据库连接字符串(web.config来配置)
        //   private static string path2 = string.Format("data source={0}", System.Web.HttpContext.Current.Server.MapPath(ConfigurationManager.ConnectionStrings["LoaclSqlServerCeEPFormConnectionString"].ConnectionString));
        public static string connectionString = ConfigurationManager.ConnectionStrings["LoaclSqlServerCeEPFormConnectionString"].ConnectionString;

        public DbHelperSqlServerCe()
        {

        }

        public static void SetSQLServerCompactEdition()
        {
            AppDomain.CurrentDomain.SetData("SQLServerCompactEditionUnderWebHosting", true);
        }

        #region 公用方法

        public static int GetMaxID(string FieldName, string TableName)
        {

            SetSQLServerCompactEdition();
            string strsql = "select max([" + FieldName + "])+1 from [" + TableName + "]";
            object obj = DbHelperSqlServerCe.GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return int.Parse(obj.ToString());
            }
        }

        public static bool Exists(string strSql)
        {
            SetSQLServerCompactEdition();
            object obj = DbHelperSqlServerCe.GetSingle(strSql);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());