public T ReadSingle(DbDataReader reader, ObjectsChangeTracker changeTracker)
{
T result = reader.Read() ? MapUsingState(reader, reader) : default(T);
if (changeTracker != null)
{
changeTracker.RegisterObject(result);
}
return(result);
}
public IEnumerable <T> ReadCollection(DbDataReader reader, ObjectsChangeTracker changeTracker)
{
while (reader.Read())
{
T result = MapUsingState(reader, reader);
if (changeTracker != null)
{
changeTracker.RegisterObject(result);
}
yield return(result);
}
reader.Close();
}
public static IEnumerable <T> ToObjects <T>(this DbDataReader reader, string readerName, string[] excludeFields, ObjectsChangeTracker changeTracker)
{
if (string.IsNullOrEmpty(readerName))
{
var mappingKeyBuilder = new StringBuilder();
for (int i = 0; i < reader.FieldCount; ++i)
{
mappingKeyBuilder.Append(reader.GetName(i));
mappingKeyBuilder.Append('$');
}
readerName = mappingKeyBuilder.ToString().ToLower();
}
return(new DataReaderToObjectMapper <T>(readerName, null, excludeFields).ReadCollection(reader, changeTracker));
}
public static T ToObject <T>(this DbDataReader reader, string readerName, string[] excludeFields, ObjectsChangeTracker changeTracker)
{
///这里将数据库表对应的字段串在一起赋值给readerName变量，方便后面判断非数据库字段
if (string.IsNullOrEmpty(readerName))
{
var mappingKeyBuilder = new StringBuilder();
for (int i = 0; i < reader.FieldCount; ++i)
{
mappingKeyBuilder.Append(reader.GetName(i));
mappingKeyBuilder.Append('$');
}
readerName = mappingKeyBuilder.ToString().ToLower();
}
T result = new DataReaderToObjectMapper <T>(readerName, null, excludeFields).MapUsingState(reader, reader);
if (changeTracker != null)
{
changeTracker.RegisterObject(result);
}
return(result);
}