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);
}
}
public override void Perform(SchemaChanges changes, IOutput output)
{
foreach (var desired in FieldType.AllFrom(changes.Desired))
{
// We don't need to set it notnull if it's supposed to be nullable
if (desired.State.IsNullable)
{
continue;
}
var current = changes.Current.Get(desired);
// This shouldn't happen because fields have been created by this point
if (current == null)
{
changes.Fail("Trying to set " + desired + " not null but it hasn't been added yet!");
continue;
}
// This shouldn't happen either because field types have been altered by this point
if (!FieldType.IsTypeEqual(desired.State, current.State, changes.SchemaDriver.IsSequencedPartOfFieldDeclaration))
{
changes.Fail("Trying to set " + desired + " not null but its type is still wrong!");
continue;
}
// We don't need to set it notnull if it already is
if (!current.State.IsNullable)
{
continue;
}
// Update the field to notnull
changes.Put(changes.SchemaDriver.GetSetFieldNotNullSql(desired.ParentName, desired.Name, desired.State.DataType, desired.State.IsSequencedPkey, desired.State.SequenceName),
desired);
}
}