DBHelper.cs

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using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
//using System.Web.Security;
//using System.Web.UI;
//using System.Web.UI.HtmlControls;
//using System.Web.UI.WebControls;
//using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;


namespace CARDAL
{
    public class DbHelp
    {
        public DbHelp()
        {
            //
            //TODO: 在此处添加构造函数逻辑
            //
        }
        private static SqlConnection connection;
        public static SqlConnection Connection
        {
            get
            {
                string connectionString = ConfigurationManager.ConnectionStrings["CAR"].ConnectionString;
                if (connection == null)
                {
                    connection = new SqlConnection(connectionString);
                    connection.Open();
                }
                else if (connection.State == System.Data.ConnectionState.Closed)
                {
                    connection.Open();
                }
                else if (connection.State == System.Data.ConnectionState.Broken)
                {
                    connection.Close();
                    connection.Open();
                }
                return connection;
            }
        }

        public static void GetExecuteNonQuery(string sql, params SqlParameter[] values)
        {
            SqlCommand cm = new SqlCommand(sql, Connection);
            cm.Parameters.AddRange(values);
            cm.ExecuteNonQuery();
        }
        public static void GetExecuteNonQuery(string sql)
        {
            SqlCommand cm = new SqlCommand(sql, Connection);
            cm.ExecuteNonQuery();
            connection.Close();
        }