private ITypeFieldValueList ExtractCurrentRowValues(IReadOnlyEntity entity, Type type, ITransaction tx)
{
ITypeFieldValueList fieldValueList = null;
ITypeFieldValueList keyFieldValueList = OperationUtils.ExtractEntityTypeKeyValues(entity, type);
IDbCommand cmd = null;
IDataReader reader = null;
try
{
cmd = CreateRetrievalPreparedStatement(keyFieldValueList, tx);
reader = cmd.ExecuteReader();
if (reader.Read())
{
fieldValueList = ReadValues(type, reader);
}
}
catch (Exception ex)
{
string message = String.Format("SQL Exception while trying retrieve current data row from {0}"
, entity.GetType().FullName);
throw new StatementExecutionException(message, ex);
}
finally
{
DbMgtUtility.Close(reader);
DbMgtUtility.Close(cmd);
}
return(fieldValueList);
}
private Object ExtractCurrentVersionValue(IReadOnlyEntity entity, IColumn versionColumn, Type type
, ITransaction tx)
{
Object versionValue = null;
ITypeFieldValueList keyFieldValueList = OperationUtils.ExtractEntityTypeKeyValues(entity, type);
IDbCommand cmd = null;
IDataReader reader = null;
try
{
cmd = CreateRetrievalPreparedStatement(keyFieldValueList, tx);
reader = cmd.ExecuteReader();
if (reader.Read())
{
versionValue = DbLayer.DataManipulate().ReadFromResultSet(reader, versionColumn);
}
}
catch (Exception ex)
{
String message = String.Format("SQL Exception while trying retrieve version information from {0}"
, entity.GetType().FullName);
throw new StatementExecutionException(message, ex);
}
finally
{
DbMgtUtility.Close(reader);
DbMgtUtility.Close(cmd);
}
return(versionValue);
}
private void LoadFromDb(IReadOnlyEntity roEntity, IDataReader reader, ITransaction tx)
{
EntityInfo entityInfo = CacheManager.GetEntityInfo(roEntity);
while (entityInfo != null)
{
string tableName = entityInfo.TableInfo.TableName;
if (entityInfo.EntityType == roEntity.GetType() || tableName == null) //if i==0 that means it's base class and can use existing result set
{
LoadForType(roEntity, entityInfo.EntityType, reader, tx);
}
else
{
IDbCommand superCmd = null;
IDataReader superReader = null;
try
{
ITypeFieldValueList keyValueList = OperationUtils.ExtractEntityTypeKeyValues(roEntity, entityInfo.EntityType);
superCmd = CreateRetrievalPreparedStatement(keyValueList, tx);
superReader = superCmd.ExecuteReader();
if (superReader.Read())
{
LoadForType(roEntity, entityInfo.EntityType, superReader, tx);
}
else
{
string message =
String.Format(
"Super class {0} does not contains a matching record for the base class {1}",
entityInfo.EntityType.FullName, roEntity.GetType().FullName);
throw new NoMatchingRecordFoundForSuperClassException(message);
}
}
catch (Exception ex)
{
String message = String.Format("SQL Exception while trying to read from table {0}", tableName);
throw new ReadFromResultSetException(message, ex);
}
finally
{
DbMgtUtility.Close(superReader);
DbMgtUtility.Close(superCmd);
}
}
entityInfo = entityInfo.SuperEntityInfo;
}
}
