public TEntity ReadFirstOrDefault(DbDataReader reader)
{
using (reader)
{
var session = new ReadSession();
// Read entity
var entity = default(TEntity);
var previous = entity;
while (reader.Read())
{
previous = entity;
entity = ToEntity(reader, previous, session);
if (previous != null && entity != previous)
{
break;
}
}
//// Read navigation properties
//while (reader.NextResult())
//{
// // Find navigation property
// var property = Properties.FirstOrDefault(p => p.ForeignTable.HasPrimaryKey(reader));
// property.SetProperty(, reader);
//}
return(entity);
}
}
public TEntity ToEntity(DbDataReader reader, TEntity previous, ReadSession session, int recursionDepth = 0)
{
// If primary key properties is not exists or null return default value
var primaryKeyIndex = PrimaryKey.GetColumnIndexByAlias(reader);
if (primaryKeyIndex == null || reader.IsDBNull(primaryKeyIndex.Value))
{
return(default(TEntity));
}
// Get current entity
var shift = (primaryKeyIndex.Value - PrimaryKey.Index) ?? 0;
var isSameEntity = false;
if (previous != null)
{
var prevKey = PrimaryKey.GetField(previous);
var currKey = PrimaryKey.GetValue(reader, shift);
isSameEntity = prevKey.Equals(currKey);
}
var entity = previous;
if (!isSameEntity)
{
var positions = session.GetColumnPositions(typeof(TEntity), Columns.Count);
// Set columns
int idx = 0;
entity = new TEntity();
foreach (var column in Columns)
{
var pos = positions[idx++];
column.SetField(entity, reader, pos);
}
}
// Set one to one navigation properties
if (recursionDepth < MaxRecursionDepth)
{
foreach (var property in Properties)
{
property.SetProperty(entity, reader, session, recursionDepth);
}
}
return(entity);
}
public async Task <TEntity> ReadFirstOrDefaultAsync(DbDataReader reader, CancellationToken?token = null)
{
using (reader)
{
var session = new ReadSession();
// Read entity
var entity = default(TEntity);
var previous = entity;
while (await reader.ReadAsync(token ?? CancellationToken.None))
{
entity = ToEntity(reader, previous = entity, session);
if (entity != previous)
{
break;
}
}
return(entity);
}
}
public async Task <List <TEntity> > ReadListAsync(DbDataReader reader, CancellationToken?token = null)
{
var list = new List <TEntity>();
using (reader)
{
var session = new ReadSession();
var entity = default(TEntity);
var previous = entity;
while (await reader.ReadAsync(token ?? CancellationToken.None))
{
previous = entity;
entity = ToEntity(reader, previous, session);
if (entity != previous)
{
list.Add(entity);
}
}
}
return(list);
}
public List <TEntity> ReadList(DbDataReader reader)
{
var list = new List <TEntity>();
using (reader)
{
var session = new ReadSession();
// Read entities
var entity = default(TEntity);
var previous = entity;
while (reader.Read())
{
entity = ToEntity(reader, previous = entity, session);
if (entity != previous)
{
list.Add(entity);
}
}
}
return(list);
}
