public static Identifier GetDesiredIdentifier(SchemaChanges changes, Identifier ident)
{
CheckType(ident);
if (changes.Desired.ContainsRoot(ident))
{
return(ident);
}
var rename = TableRenameType.GetFrom(changes.Desired, TableRenameType.Identifier(ident.Name));
if (rename != null)
{
return(rename.State.ToTable);
}
return(null);
}
public override void Perform(SchemaChanges changes, IOutput output)
{
var renames = from rename in TableRenameType.AllFrom(changes.Desired)
where changes.Current.ContainsRoot(TableType.Identifier(rename.Name))
group rename by rename.State.ToTable into destination
select destination;
foreach (var rename in renames)
{
var toTable = rename.Key;
if (rename.Count() > 1)
{
changes.Fail("Rename conflict: Multiple tables (" + string.Join(", ", from source in rename select source.Name) + ") wish to be renamed to " + toTable.Name);
continue;
}
var fromTable = TableType.Identifier(rename.Single().Name);
if (changes.Current.ContainsRoot(toTable))
{
changes.Fail("Rename conflict: " + fromTable + " wishes to be renamed to " + rename.Key.Name + ", but that table already exists.");
continue;
}
if (changes.Desired.ContainsRoot(fromTable))
{
changes.Fail("Rename conflict: " + fromTable + " wishes to be renamed to " + rename.Key.Name + " but also to continue existing with its current name.");
continue;
}
if (!changes.Desired.ContainsRoot(toTable))
{
changes.Fail("Rename conflict: " + fromTable + " wishes to be renamed to " + rename.Key.Name + " but that table is not supposed to exist.");
continue;
}
changes.Rename(changes.SchemaDriver.GetRenameTableSql(fromTable.Name, toTable.Name), fromTable, toTable);
}
}