public DataSource(string name)
{
if (name == null)
{
throw new ArgumentNullException("name");
}
disposed = false;
_name = name;
_type = DataSourceType.Unknown;
_provider = null;
_trans = new DataTransaction(this);
_locker = new VersionLocker();
_pscount = 0;
ConnectionStringSettings settings = System.Configuration.ConfigurationManager.ConnectionStrings[_name];
if (settings == null)
{
throw new SettingsPropertyNotFoundException(string.Concat("配置文件中不存在名为“", _name, "”的数据库连接字符串"));
}
DbProviderFactory factory = DbProviderFactories.GetFactory(settings.ProviderName);
_conn = factory.CreateConnection();
_conn.ConnectionString = settings.ConnectionString;
_conn.Open();
lock (_locker.Locker)
_locker.Increment();
}
public DataSource(DataSource ds)
{
if (ds == null)
{
throw new ArgumentNullException("ds");
}
disposed = false;
_name = ds._name;
_type = ds._type;
_provider = ds._provider;
_trans = ds._trans;
_locker = ds._locker;
_pscount = ds.PsCount;
_conn = ds._conn;
lock (_locker.Locker)
_locker.Increment();
}
public DataTransaction(DataSource ds)
{
_ds = ds;
trans = null;
locker = new VersionLocker();
}
