public IEnumerable <T> Select <T>(DataAspect aspect, ClassFilter filter, ClassSort sort, int pageSize, int pageOrdinal)
{
using (IDbConnection conn = _dialect.CreateConnection(_ConnectionString))
{
conn.Open();
try
{
IEnumerable <IDataRecord> records = _dialect.CreateSelect(aspect, filter, sort, pageSize, pageOrdinal).ExecuteQuery(conn);
if (pageSize > 0 && pageOrdinal >= 0)
{
if (!_dialect.CanOffsetRecords)
{
if (!_dialect.CanLimitRecords)
{
records = new Collections.EnumerablePager <IDataRecord>(records, pageSize, pageOrdinal);
}
else
{
records = new Collections.EnumerableOffset <IDataRecord>(records, pageSize * pageOrdinal);
}
}
else if (!_dialect.CanLimitRecords)
{
records = new Collections.EnumerableLimit <IDataRecord>(records, pageSize);
}
}
using (IEnumerator <IDataRecord> e = records.GetEnumerator())
{
if (e.MoveNext())
{
bool initializable = typeof(Initializable).IsAssignableFrom(aspect.DataType);
int count = e.Current.FieldCount;
do
{
T entity = (T)aspect.NewInstance();
for (int i = 0; i < count; i++)
{
if (!e.Current.IsDBNull(i))
{
aspect[i].SetValue(entity, e.Current.GetValue(i));
}
}
if (initializable)
{
((Initializable)entity).Initialize();
}
yield return(entity);
} while (e.MoveNext());
}
}
}
finally
{
conn.Close();
}
}
}
