App_Code/MicroDBHelper.cs

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using System;
using System.Configuration;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Data.OleDb;


/// <summary>
/// DataBase数据库
/// </summary>
namespace MicroDBHelper
{
    public abstract class MsSQLDbHelper
    {
        private static string GetConnStr(string ConnType = "Default")
        {
            string ConnStr = ConfigurationManager.ConnectionStrings["ConnectionName"].ToString();

            if (ConnType == "Car")
                ConnStr = ConfigurationManager.ConnectionStrings["ConnectionNameCar"].ToString();
            else if (ConnType == "Card")
                ConnStr = ConfigurationManager.ConnectionStrings["ConnectionNameCard"].ToString();
            else if (ConnType=="ReadExcel")
                ConnStr = ConfigurationManager.ConnectionStrings["ConnectionNameReadExcel"].ToString();

            return ConnStr;
        }

        #region 公用方法

        /// <summary>
        /// 检查表是否存在
        /// </summary>
        /// <param name="TableName">表名</param>
        /// <returns></returns>
        public static bool TableExists(string TableName, string ConnType = "Default")
        {
            string strsql = "select count(*) from sysobjects where id = object_id(N'[" + TableName + "]') and OBJECTPROPERTY(id, N'IsUserTable') = 1";
            //string strsql = "SELECT count(*) FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[" + TableName + "]') AND type in (N'U')";
            object obj = GetSingle(strsql, ConnType);
            int cmdresult;
            if (Equals(obj, null) || Equals(obj, DBNull.Value))
                cmdresult = 0;
            else
                cmdresult = int.Parse(obj.ToString());

            if (cmdresult == 0)
                return false;
            else
                return true;
        }

        /// <summary>
        /// 检查MicroTables表是的某字段否存在
        /// </summary>
        /// <param name="Field">需要检查的字段，如:ShortTableName</param>