public EntityRecord ReadRecord(IDataRecord dataRecord, EntitySession session)
{
// Some outer join queries may produce entities that are null; so we first try to read Primary key values - if they're all null, we return null.
if (_primaryKeyColumns.Count > 0 && PrimaryKeyIsNull(dataRecord))
{
return(null);
}
var entRec = new EntityRecord(_tableInfo.Entity, EntityStatus.Loading);
bool isView = _tableInfo.Entity.Kind == EntityKind.View;
object dbValue = null;
OutColumnMapping colMap = null;
//for-i loop is more efficient than foreach
for (int i = 0; i < _columns.Count; i++)
{
try {
colMap = _columns[i];
var dbCol = colMap.DbColumn;
var isNull = dataRecord.IsDBNull(colMap.ReaderColumnIndex);
if (isNull)
{
// Views might have NULLs unexpectedly in columns like Count() or Sum() - LINQ expr has non-nullable type, but in fact
// the view column can return NULL
if (isView && !dbCol.Flags.IsSet(DbColumnFlags.Nullable))
{
dbValue = dbCol.Member.DefaultValue;
}
else
{
dbValue = DBNull.Value;
}
}
else
{
// not NULL
dbValue = dbCol.TypeInfo.ColumnReader(dataRecord, colMap.ReaderColumnIndex);
var conv = dbCol.Converter.ColumnToProperty;
if (dbValue != null && conv != null)
{
dbValue = conv(dbValue);
}
// quick fix: views sometimes have out columns changed from expected
if (isView && !ConvertHelper.UnderlyingTypesMatch(dbCol.Member.DataType, dbValue.GetType()))
{
dbValue = ConvertHelper.ChangeType(dbValue, dbCol.Member.DataType);
}
}
var member = dbCol.Member;
entRec.ValuesOriginal[member.ValueIndex] = dbValue;
} catch (Exception ex) {
ex.AddValue("DataRecord", dataRecord);
ex.AddValue("ColumnName", colMap.DbColumn.ColumnName);
ex.AddValue("DbValue", dbValue);
throw;
}
}
var sessionRec = session.Attach(entRec); //might return different, previously loaded record
return(sessionRec);
}
public EntityRecord Lookup(EntityKey primaryKey, EntitySession session)
{
var strKey = primaryKey.AsString();
var data = _cacheTable.Lookup(strKey);
if(data == null)
return null;
var needVersion = session.Context.EntityCacheVersion;
if(data.Version < needVersion) {
_cacheTable.Remove(primaryKey.AsString());
return null;
}
var rec = new EntityRecord(primaryKey);
Array.Copy(data.Values, rec.ValuesOriginal, data.Values.Length);
rec.SourceCacheType = CacheType.Sparse;
session.Attach(rec);
return rec;
}
public static EntityRecord CloneAndAttach(EntitySession toSession, EntityRecord record, bool forceFullCopy = false)
{
if (record.Session == toSession)
{
return(record); //do not clone if it is already in this session
}
//If record with the same PK is already loaded in session, use it in result; otherwise, clone record from cache and attach
var sessionRec = toSession.GetRecord(record.PrimaryKey, LoadFlags.None);
if (sessionRec == null)
{
sessionRec = new EntityRecord(record); //make clone
toSession.Attach(sessionRec);
}
else if (sessionRec.Status == EntityStatus.Stub || forceFullCopy)
{
sessionRec.CopyOriginalValues(record);
}
sessionRec.SourceCacheType = CacheType.FullSet;
return(sessionRec);
}
public EntityRecord Lookup(EntityKey primaryKey, EntitySession session)
{
var strKey = primaryKey.AsString();
var data = _cacheTable.Lookup(strKey);
if (data == null)
{
return(null);
}
var needVersion = session.Context.EntityCacheVersion;
if (data.Version < needVersion)
{
_cacheTable.Remove(primaryKey.AsString());
return(null);
}
var rec = new EntityRecord(primaryKey);
Array.Copy(data.Values, rec.ValuesOriginal, data.Values.Length);
rec.SourceCacheType = CacheType.Sparse;
session.Attach(rec);
return(rec);
}
public EntityRecord ReadRecord(IDataRecord dataRecord, EntitySession session)
{
// Some outer join queries may produce entities that are null; so we first try to read Primary key values - if they're all null, we return null.
if (_primaryKeyColumns.Count > 0 && PrimaryKeyIsNull(dataRecord))
return null;
var entRec = new EntityRecord(_tableInfo.Entity, EntityStatus.Loading);
object dbValue = null;
OutColumnMapping colMap = null;
//for-i loop is more efficient than foreach
for (int i = 0; i < _columns.Count; i++) {
try {
colMap = _columns[i];
dbValue = dataRecord[colMap.ReaderColumnIndex];
//System.Diagnostics.Debug.WriteLine(colMap.DbColumn.ColumnName + " " + dbValue + "(" + dbValue.GetType() + ")");
var conv = colMap.DbColumn.TypeInfo.ColumnToPropertyConverter;
if(dbValue != null && conv != null)
dbValue = conv(dbValue);
entRec.ValuesOriginal[colMap.DbColumn.Member.ValueIndex] = dbValue;
} catch (Exception ex) {
ex.AddValue("DataRecord", dataRecord);
ex.AddValue("ColumnName", colMap.DbColumn.ColumnName);
ex.AddValue("DbValue", dbValue);
throw;
}
}
var sessionRec = session.Attach(entRec); //might return different, previously loaded record
return sessionRec;
}
