在 GQL 查询中 ANCESTOR IS :1 到底意味着什么？
我遇到过包含 ANCESTOR IS :1 的 GQL 查询。那么，祖先是什么？ :1 代表什么？
query = db.GqlQuery("SELECT * "
"FROM my_db "
"WHERE ANCESTOR IS :1 AND answer > :3 AND ch = :4 "
"ORDER BY answer",
my_db_key('name'),
x,
ch)
例如，在上面的查询中，这行“WHERE ANCESTOR IS :1 AND answer > :3 AND ch = :4 ”应该做什么？
I have come across with GQL queries containing ANCESTOR IS :1. So, what the ancestor is and what :1 stands for?
query = db.GqlQuery("SELECT * "
"FROM my_db "
"WHERE ANCESTOR IS :1 AND answer > :3 AND ch = :4 "
"ORDER BY answer",
my_db_key('name'),
x,
ch)
e.g in the query above what this line "WHERE ANCESTOR IS :1 AND answer > :3 AND ch = :4 " is suppose to do?
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祖先查询返回给定祖先实体的后代；也就是说，将祖先列为其父级的实体，或其父级，等等。
:1、:2等是占位符，由以下参数替换到GqlQuery()。An ancestor query returns descendants of the given ancestor entity; that is, entities that list the ancestor as their parent, or whose parent does, etc.
:1,:2, etc. are placeholders that are replaced by the following parameters toGqlQuery().