protected string GenerateSubquery(PersistentClass model, IMapping mapping)
{
Dialect.Dialect dialect = Factory.Dialect;
Settings settings = Factory.Settings;
if (!model.HasSubclasses)
{
return(model.Table.GetQualifiedName(dialect, settings.DefaultCatalogName, settings.DefaultSchemaName));
}
HashedSet <Column> columns = new HashedSet <Column>();
foreach (Table table in model.SubclassTableClosureIterator)
{
if (!table.IsAbstractUnionTable)
{
foreach (Column column in table.ColumnIterator)
{
columns.Add(column);
}
}
}
StringBuilder buf = new StringBuilder().Append("( ");
IEnumerable <PersistentClass> siter =
new JoinedEnumerable <PersistentClass>(new SingletonEnumerable <PersistentClass>(model),
new SafetyEnumerable <PersistentClass>(model.SubclassIterator));
foreach (PersistentClass clazz in siter)
{
Table table = clazz.Table;
if (!table.IsAbstractUnionTable)
{
buf.Append("select ");
foreach (Column col in columns)
{
if (!table.ContainsColumn(col))
{
SqlType sqlType = col.GetSqlTypeCode(mapping);
buf.Append(dialect.GetSelectClauseNullString(sqlType)).Append(" as ");
}
buf.Append(col.Name);
buf.Append(StringHelper.CommaSpace);
}
buf.Append(clazz.SubclassId).Append(" as clazz_");
buf.Append(" from ").Append(table.GetQualifiedName(dialect, settings.DefaultCatalogName, settings.DefaultSchemaName));
buf.Append(" union ");
if (dialect.SupportsUnionAll)
{
buf.Append("all ");
}
}
}
if (buf.Length > 2)
{
//chop the last union (all)
buf.Length -= (dialect.SupportsUnionAll ? 11 : 7); //" union " : "all "
}
return(buf.Append(" )").ToString());
}