public class DBHelper
{
private static SqlConnection connection;
public static SqlConnection Connection
{
get
{
string connectionString = ConfigurationManager.ConnectionStrings["MyCommerce"].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)
{
1、Web.config 可以采用写连接条件 或 附加 ×.mdf 文件
<connectionStrings>
<add name="Sales"
providerName="System.Data.SqlClient"
connectionString= "server=myserver;database=Products;uid=<user name&g ......
