/// <summary>
/// Constructs a new Relation object
/// </summary>
public Relation(Class cl)
: base(cl)
{
// fields initialized with null are optional
// fields initialized with "" are required
fieldName = "";
mappingTable = null;
referencedTypeName = "";
relationName = "";
}
/// <summary>
/// Removes the ForeignKeyColumn object from the list of ForeignKeyColumns in the parent object.
/// </summary>
public override void Remove()
{
Relation r = Parent as Relation;
if (r != null)
{
r.RemoveForeignKeyColumn(this);
return;
}
MappingTable mt = Parent as MappingTable;
if (mt != null)
{
mt.RemoveChildForeignKeyColumn(this);
}
}
internal Relation(XmlNode relNode, Class parent)
: base(relNode, parent)
{
fieldName = relNode.Attributes["FieldName"].Value;
referencedTypeName = relNode.Attributes["ReferencedTypeName"].Value;
if (relNode.Attributes["AccessorName"] != null)
{
this.accessorName = relNode.Attributes["AccessorName"].Value;
}
if (relNode.Attributes["ForeignKeyTypeColumnName"] != null && relNode.Attributes["ForeignKeyTypeColumnName"].Value != string.Empty)
{
this.foreignKeyTypeColumnName = relNode.Attributes["ForeignKeyTypeColumnName"].Value;
}
if (relNode.Attributes["ForeignKeyColumnName"] != null) // Old mapping
{
ForeignKeyColumn fkColumn = new ForeignKeyColumn(this);
fkColumn.Name = relNode.Attributes["ForeignKeyColumnName"].Value;
this.foreignKeyColumns.Add(fkColumn);
}
else
{
XmlNodeList nl = relNode.SelectNodes(parent.Parent.selectForeignKeyColumns);
foreach (XmlNode fkcNode in nl)
{
this.foreignKeyColumns.Add(new ForeignKeyColumn(fkcNode, this));
}
}
XmlNode mtNode = relNode.SelectSingleNode(Parent.Parent.selectMappingTable, Parent.Parent.nsmgr);
if (null != mtNode)
{
mappingTable = new MappingTable(mtNode, this);
}
if (null != relNode.Attributes["RelationName"])
{
relationName = relNode.Attributes["RelationName"].Value;
}
else
{
relationName = string.Empty;
}
}
private bool ForeignKeyColumnsAreDifferent(MappingTable t1, MappingTable t2)
{
var t1ChildForeignKeyColumns = t1.ChildForeignKeyColumns.ToList();
var t2ChildForeignKeyColumns = t2.ChildForeignKeyColumns.ToList();
if (t1ChildForeignKeyColumns.Count != t2ChildForeignKeyColumns.Count)
{
return(true);
}
for (int i = 0; i < t1ChildForeignKeyColumns.Count; i++)
{
ForeignKeyColumn fkc1 = t1ChildForeignKeyColumns[i];
ForeignKeyColumn fkc2 = t2ChildForeignKeyColumns[i];
if (ColumnsAreDifferent(fkc1, fkc2))
{
return(true);
}
}
return(false);
}
/// <summary>
/// Constructs a ForeignKeyIterator object, which iterates over all child foreign key columns of the given mapping table.
/// </summary>
/// <param name="mt"></param>
public ForeignKeyIterator(MappingTable mt)
{
this.columns = mt.ChildForeignKeyColumns.ToList();
}
