Bll/DbHelperSQL.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace Bll
{
    /// <summary>
    /// 数据访问基类
    /// </summary>
    public abstract class DbHelperSQL
    {
        public DbHelperSQL()
        { }
        /// <summary>
        /// 连接数据库对象
        /// </summary>
        protected static string connstr = ConfigurationManager.ConnectionStrings["connstring"].ConnectionString;
        #region 公用方法
        /// <summary>
        /// 参数化检查登录用户
        /// </summary>
        /// <param name="strSql"></param>
        /// <param name="cmdParms"></param>
        /// <returns></returns>
        public static bool Exists(string strSql, params SqlParameter[] cmdParms)
        {
            object obj = GetSingle(strSql, cmdParms);
            int cmdresult;//结果
            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 执行简单的SQL语句
        /// <summary>
        /// 执行SQL语句，返回影响的记录数
        /// </summary>
        /// <param name="strSql">SQL语句</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSql(string strSql)
        {
            using (SqlConnection conn = new SqlConnection(connstr))
            {
                using (SqlCommand comm = new SqlCommand(strSql, conn))