private void EnsureGeneratedFKsCollectionIsInitialized()
{
if (this.generatedFKs != null)
return;
this.generatedFKs = new ForeignKeyCollection();
foreach (ForeignKey fk in this.foreignKeys)
{
// Skip FKs to tables for which code is not generated.
if (IsTableGenerated(this.generatedTables, fk.ParentTableName))
this.generatedFKs.Add(fk);
}
}
private static Dictionary<string, ForeignKey> FindParallelFKs(ForeignKeyCollection generatedFKs)
{
// Find parallel FKs (multiple FKs to the same table). They need additional name resolving.
// Example: Employee table has ReportsTo (employee manager) and ControlledBy (employee quality assurance controller) columns.
// There are two recursive relations in the table. Lets say that there are 3 levels.
// 1. ReportsTo branch: Worker-Manager.
// 2. ControlledBy branch: Worker-Controller.
// Generate FK members with the names:
// 1. Worker_ReportsTo.
// 2. Worker_ControlledBy.
Dictionary<string, ForeignKey> parallelFKs = new Dictionary<string, ForeignKey>();
for (int i=0; i<generatedFKs.Count; i++)
{
// Find parallel relations.
for (int j=i+1; j<generatedFKs.Count; j++)
{
if (generatedFKs[i].ParentTableName == generatedFKs[j].ParentTableName)
{
// Both paralel relations will use aliases for parent tables.
if (!parallelFKs.ContainsKey(generatedFKs[i].ConstraintName))
parallelFKs[generatedFKs[i].ConstraintName] = generatedFKs[i];
if (!parallelFKs.ContainsKey(generatedFKs[j].ConstraintName))
parallelFKs[generatedFKs[j].ConstraintName] = generatedFKs[j];
}
}
}
return parallelFKs;
}
/// <summary>Gets parallel FKs, ie. FKs which reference the same parent table. These need additional name resolving.</summary>
public ForeignKeyCollection FindParallelFKs()
{
ForeignKeyCollection parallelFKs = new ForeignKeyCollection();
foreach (KeyValuePair<string, ForeignKey> nameAndFk in FindParallelFKs(this))
parallelFKs.list.Add(nameAndFk.Value);
return parallelFKs;
}