/// <summary> /// Read object from data record /// </summary> /// <param name="record">Data record</param> /// <param name="path">Current property path</param> /// <returns>Object</returns> internal abstract object TakeObject(DataRecord record, string path);
/// <summary>
/// Execute query and return data map
/// </summary>
private IEnumerable <T> ExecuteQuery <T>(IDbCommand command, string[] outputParameters, DataAliasCollection settings, EntityMappingCollection mappings, EntityMapperCollection mappers, DataReflectorCollection reflectors, object bag)
{
// Get root path
var rootPath = outputParameters[0];
using (var reader = command.ExecuteReader())
{
var record = new DataRecord(reader, mappers, reflectors, bag);
int index = 0;
do
{
try
{
// Set path
record.SetPath(outputParameters[index]);
// Substitute stored procedure field names to manual mapped field names
for (int i = 0; i < reader.FieldCount; i++)
{
record.AddField(settings.Get(outputParameters[index], reader.GetName(i)), i);
}
// Detect current iteration type
if (index == 0)
{
// Detect primary reader for map
EntityMapper <T> entityMapper = mappers.Get <T>();
if (entityMapper == null)
{
throw new DataLayerException(Properties.Resources.PrimaryMapperNotRegistered);
}
// Register types of current path in cache
record.InitCache(typeof(T), typeof(List <T>), outputParameters[index]);
// Read data from stream
//if (reader.HasRows)
while (reader.Read())
{
entityMapper.ReadEntity(record, outputParameters[index]);
}
}
else
{
// Take relative and ending path
var relativePath = GetRelativePath(outputParameters[index]);
var endingPath = GetEndingPath(outputParameters[index]);
// Determine target entity type path
var entityType = record.GetEntityType(relativePath);
if (entityType == null)
{
continue;
}
// Take mapping
var mapping = mappings.GetMapping(entityType, endingPath);
if (mapping == null)
{
throw new DataLayerException(string.Format(Properties.Resources.MappingNotSpecified, endingPath));
}
// Detect reader registered for specified path
EntityMapper entityMapper = mappers.Get(mapping.ChildType);
if (entityMapper == null)
{
continue;
}
// Register types of current path in cache
record.InitCache(mapping.ChildType, mapping.ChildListType, outputParameters[index]);
// Read data from stream and reflect it to primary entitiy
//if (reader.HasRows)
while (reader.Read())
{
entityMapper.ReadEntity(record, outputParameters[index]);
}
// Taking left entities
var parentEntities = record.TakeEntities(relativePath);
if (parentEntities == null)
{
break;
}
// Taking child entities
var childEntities = record.TakeEntities(outputParameters[index]);
// Invoke join operation
foreach (var parent in parentEntities)
{
if (!mapping.IsMatch(parent))
{
continue;
}
List <object> result = new List <object>();
if (childEntities != null)
{
foreach (var child in childEntities)
{
if (mapping.JoinCondition(parent, child))
{
result.Add(child);
}
}
}
if (result != null)
{
mapping.Setter(parent, result);
}
}
}
}
finally
{
index++;
}
}while (reader.NextResult());
return(record.TakeEntities <T>(rootPath));
}
}
/// <summary> /// Read entity from data record /// </summary> /// <param name="record">Data record</param> /// <param name="path">Current property path</param> /// <returns>Entity</returns> internal abstract object ReadEntity(DataRecord record, string path);
/// <summary>
/// Get acceptance of readed entity
/// </summary>
/// <param name="record">Data record</param>
/// <param name="path">Property path</param>
/// <returns>Acceptance</returns>
protected internal virtual bool CanRead(DataRecord record, string path)
{
return(true);
}
/// <summary> /// Read entity from data source /// </summary> /// <param name="record">Data source image</param> /// <param name="path">Current relative path</param> /// <returns>Entity</returns> protected abstract T Read(DataRecord record, string path);
/// <summary>
/// Fill specified entity from data source
/// </summary>
/// <param name="entity">Entity to fill</param>
/// <param name="record">Data source image</param>
/// <param name="path">Current relative path</param>
protected virtual void Fill(T entity, DataRecord record, string path)
{
}
internal override object TakeObject(DataRecord record, string path)
{
return(TakeEntity(record, path));
}
