public object Load(IDataMapper db, object parent)
{
TParent tParent = (TParent)parent;
if (Condition != null && !Condition(tParent))
{
return(null);
}
else
{
if (_relationshipType == RelationshipTypes.One)
{
// Parent FK = Child PK
if (_childColumns.PrimaryKeys.Count != 1)
{
throw new DataMappingException(string.Format("'{0}' must have exactly one primary key mapped.", typeof(TChild).Name));
}
var childPK = _childColumns.PrimaryKeys[0];
var parentFK = _parentColumns.GetByFieldName(_fk);
if (parentFK == null)
{
throw new DataMappingException(string.Format("'{0}' does not contain foreign key field '{1}'.", typeof(TParent), _fk));
}
db.AddParameter("@FK", parentFK.Getter(parent));
var query = db.Query <TChild>();
string whereClause = query.BuildColumnName(childPK.ColumnInfo.Name) + "=@FK";
return(query.Where(whereClause).FirstOrDefault());
}
else if (_relationshipType == RelationshipTypes.Many)
{
// Parent PK = Child FK
if (_parentColumns.PrimaryKeys.Count != 1)
{
throw new DataMappingException(string.Format("'{0}' must have exactly one primary key mapped.", typeof(TParent).Name));
}
var parentPK = _parentColumns.PrimaryKeys[0];
var childFK = _childColumns.GetByFieldName(_fk);
if (childFK == null)
{
throw new DataMappingException(string.Format("'{0}' does not contain foreign key field '{1}'.", typeof(TChild), _fk));
}
db.AddParameter("@PK", parentPK.Getter(parent));
var query = db.Query <TChild>();
string whereClause = query.BuildColumnName(childFK.ColumnInfo.Name) + "=@PK";
return(query.Where(whereClause).ToList());
}
else
{
// This should not happen because relationship type should be inferred already
throw new DataMappingException(string.Format("Unable to infer relationship type for parent '{0}' -> '{1}'.",
typeof(TParent).Name, typeof(TChild).Name));
}
}
}
public virtual InsertQueryBuilder <T> ColumnsIncluding(params string[] properties)
{
_columnsToInsert = new ColumnMapCollection();
foreach (string propertyName in properties)
{
_columnsToInsert.Add(_mappings.GetByFieldName(propertyName));
}
return(this);
}