/// <summary>
/// Generates the cascade deletions.
/// </summary>
/// <param name="db">The db.</param>
/// <returns></returns>
public List <ChangeSetDeleteItem> GenerateCascadeDeletions(DatabaseInfo db)
{
var res = new List <ChangeSetDeleteItem>();
DoGenerateCascadeDeletions(db, res);
var dct = new Dictionary <NameWithSchema, DeleteWrapper>();
var queue = new List <DeleteWrapper>();
foreach (var item in res)
{
DeleteWrapper wrap;
if (!dct.ContainsKey(item.TargetTable))
{
wrap = new DeleteWrapper();
dct[item.TargetTable] = wrap;
wrap.Table = db.FindTable(item.TargetTable);
wrap.Refs = wrap.Table.GetReferences().Select(x => x.OwnerTable.FullName).ToList();
wrap.Refs.RemoveAll(x => x == wrap.Table.FullName);
queue.Add(wrap);
}
else
{
wrap = dct[item.TargetTable];
}
wrap.Items.Add(item);
}
queue.Reverse();
var resWrappers = new List <DeleteWrapper>();
while (queue.Any())
{
DeleteWrapper selected = null;
foreach (var wrap in queue)
{
if (wrap.Refs.All(x => resWrappers.Any(y => y.Table.FullName == x)))
{
selected = wrap;
break;
}
}
if (selected == null)
{
// omit partial ordering, if order is not possible
selected = queue.First();
}
queue.Remove(selected);
resWrappers.Add(selected);
}
return(resWrappers.SelectMany(x => x.Items).ToList());
}
/// <summary>
/// Generates the cascade deletions.
/// </summary>
/// <param name="db">The db.</param>
/// <returns></returns>
public List<ChangeSetDeleteItem> GenerateCascadeDeletions(DatabaseInfo db)
{
var res = new List<ChangeSetDeleteItem>();
DoGenerateCascadeDeletions(db, res);
var dct = new Dictionary<NameWithSchema, DeleteWrapper>();
var queue = new List<DeleteWrapper>();
foreach (var item in res)
{
DeleteWrapper wrap;
if (!dct.ContainsKey(item.TargetTable))
{
wrap = new DeleteWrapper();
dct[item.TargetTable] = wrap;
wrap.Table = db.FindTable(item.TargetTable);
wrap.Refs = wrap.Table.GetReferences().Select(x => x.OwnerTable.FullName).ToList();
wrap.Refs.RemoveAll(x => x == wrap.Table.FullName);
queue.Add(wrap);
}
else
{
wrap = dct[item.TargetTable];
}
wrap.Items.Add(item);
}
queue.Reverse();
var resWrappers = new List<DeleteWrapper>();
while (queue.Any())
{
DeleteWrapper selected = null;
foreach (var wrap in queue)
{
if (wrap.Refs.All(x => resWrappers.Any(y => y.Table.FullName == x)))
{
selected = wrap;
break;
}
}
if (selected == null)
{
// omit partial ordering, if order is not possible
selected = queue.First();
}
queue.Remove(selected);
resWrappers.Add(selected);
}
return resWrappers.SelectMany(x => x.Items).ToList();
}
