[英]find in BSON documents with MongoDB C++ driver
我的MongoDB测试数据库中有以下文档:
db.a.find()
{[ {
"_id" : ObjectId("5113d680732fb764c44qweq"),
"Builds" : [
{
"level" : 1,
"rank" : 2
},
{
"level" : 3,
"rank" : 4
}
],
"abs" : [
{
"level" : 3,
"status" : 5
},
{
"level" : 3,
"status" : 4
}
]
}, {
"_id" : ObjectId("5113d680732fb764c4464fdf"),
"Builds" : [
{
"level" : 3,
"rank" : 5
},
{
"level" : 3,
"rank" : 4
}
],
"abs" : [
{
"level" : 3,
"status" : 5
},
{
"level" : 3,
"status" : 4
}
]
}
]}
我需要找到构建级别> = 2和<= 5且Abs状态> = 5就像if(builds.leve> = 2 && builds.level <= 5 && abs.status> = 5 && abs.level> = 2)多个条件,需要取一个值的大小您能帮我吗?
这是给您的样品。 我对mongo cxx的了解不多,所以我不确定语法。
bsoncxx::builder::stream::document filter_builder;
filter_builder << "$or" << "Builds.level"
<< open_document << "$gte" << 1 << "$lte" << 5 << close_document
<< open_document << "abs.status" << "$gte" << 2 << "$lte" << 5
<< close_document << close_array;
auto cursor = db["your collection name"].find(filter_builder.view());
for (auto&& doc : cursor) {
std::cout << bsoncxx::to_json(doc) << std::endl;
}
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