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//从web.config文件中获得数据库连接字符串
private static string sqlStr = System.Configuration.ConfigurationManager.ConnectionStrings["TestConnectionString"].ToString();
public static SqlConnection con = null;
public static object obj = null;
//单例模式
private static volatile SqlHelp sqlInstance;
private SqlHelp() { }
private static object lockHelper = new object();
public static SqlHelp SqlInstane()
{
if (sqlInstance == null)
{
lock (lockHelper)
{
if (sqlInstance == null)
{
sqlInstance = new SqlHelp();
}
}
}
return sqlInstance;
}
/// <summary>
/// 数据添加或修改方法
/// </summary>
/// <param name="sql">T-SQL语句</param>
/// <returns>int,影响的行数</returns>
public int UpdateORInsert(string sql)
{
此处略过!!
}
}