问题描述
编辑-在此为感兴趣的参与者提供了一些帮助> https://developer.mongodb.com/community/forums/t/writting-query-for-array-in-c/7793/2
我正在学习如何在mongo中操作数组/对象...目前正在尝试按照本教程>
https://blog.mlab.com/2018/09/use-push-to-insert-elements-into-an-array/
主要>
> db.alphabet.insert({
"_id": "22222","array": ['a','b','c','d','e','f','g','h','j']
})
// We missed the 'i'!
// Let's add it in the position before the last element.
> db.alphabet.update(
{ "_id": "22222" },{
$push: {
array: {
$each: ['i'],$position: -1
}
}
})
// Check the results:
> db.alphabet.find({ "_id": "22222" })
{ "array" : [ "a","b","c","d","e","f","g","h","i","j" ] }v
我从这样的东西开始>
auto replace = coll.update_one(make_document(kvp("_id",bsoncxx::oid("5f3289b7807200001f002b35"))),make_document(kvp("$push",make_document(
kvp("arrayKeyTest","????????????????")
))));
但是卡住了其余的查询,数组...
我还想用类似以下的方法替换整个数组:
QVector<std::string> items= {"vfdsvds","vdsvsd","htrhjfgr","G243TYES"}
auto ar = bsoncxx::builder::basic::array{};
for(auto&e:items){
ar.append(e.c_str());
}
然后将ar作为某些键的值推入文档中...但是我迷路了...
任何帮助都会很棒。 TIA
解决方法
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