MongoDB 字段名称中不允许使用哪些字符？
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What characters are NOT allowed in MongoDB field names?
提问by Blacksad
I figured out that of course . and SPACE aren't allowed. Are there other forbidden characters ?
我当然想通了。和 SPACE 是不允许的。还有其他禁止字符吗？
回答by Acorn
You can use any (UTF8) character in the field name which aren't special (contains ".", or starts with "$").
您可以在字段名称中使用任何不特殊的 (UTF8) 字符（包含“.”，或以“$”开头）。
https://jira.mongodb.org/browse/SERVER-3229
https://jira.mongodb.org/browse/SERVER-3229
https://stackoverflow.com/a/7976235/311220
https://stackoverflow.com/a/7976235/311220
It's generally best to stick with lowercase alphanumeric with underscores though.
不过，通常最好坚持使用带下划线的小写字母数字。
回答by Dave
Something else to look out for is the fact that you can make a property name called "query" but then use query operators on it, making it awkward to do a large number of queries.
需要注意的另一件事是，您可以创建一个名为“query”的属性名称，然后在其上使用查询运算符，这使得执行大量查询变得很尴尬。
Example:
例子：
Insert document with a property named
插入具有名为的属性的文档
db.coll.insert({ query: 'foo' });
Equality query works:
相等查询的工作原理：
db.coll.findOne({ query: 'foo' });
Not equal ($ne) does not:
不等于 ($ne) 不：
db.coll.findOne({ query: { $ne: 'bar' } });
