App_Code/DBHelper.cs

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using System;
using System.Collections;
using System.Data;
using System.Data.SqlClient;

/// <summary>
/// 数据访问基础类(基于SQLServer)
/// </summary>
public abstract class DbHelperSQL
{
    

    #region //数据库连接字符串(web.config来配置)
    protected static string connectionString = ConfigHelper.GetValueByKey("ConnString");
    #endregion 
    public DbHelperSQL()
    {
    }

    #region 公用方法

    public static int GetMaxID(string FieldName, string TableName)
    {
        string strsql = "select max(" + FieldName + ")+1 from " + TableName;
        object obj = GetSingle(strsql);
        if (obj == null)
        {
            return 1;
        }
        else
        {
            return int.Parse(obj.ToString());
        }
    }
    public static bool Exists(string strSql, params SqlParameter[] cmdParms)
    {
        object obj = GetSingle(strSql, cmdParms);
        int cmdresult;
        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
        {
            cmdresult = 0;
        }
        else
        {
            cmdresult = int.Parse(obj.ToString());
        }
        if (cmdresult == 0)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    #endregion

    #region  执行简单SQL语句

    /// <summary>