MongoDB查询从使用NumberInt()设置字段值的文档中获取特定文档？
将NumberInt()被用于明确指定的32位整数。让我们创建一个包含文档的集合-
> db.demo357.insertOne(
... {
... "FirstName" : "Chris",
... "Age" : 21,
... "details" : {
... "studentDetails" : {
... "id" : NumberInt(101)
... }
... }
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e568fa6f8647eb59e5620c9")
}
> db.demo357.insertOne(
... {
... "FirstName" : "David",
... "Age" : 23,
... "details" : {
... "studentDetails" : {
... "id" : NumberInt(110)
... }
... }
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e568fbaf8647eb59e5620ca")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo357.find();
这将产生以下输出-
{ "_id" : ObjectId("5e568fa6f8647eb59e5620c9"), "FirstName" : "Chris", "Age" : 21, "details" : { "studentDetails" : { id" : 101 } } }
{ "_id" : ObjectId("5e568fbaf8647eb59e5620ca"), "FirstName" : "David", "Age" : 23, "details" : { "studentDetails" : { "id" : 110 } } }这是获取特定文档的查询-
> db.demo357.find({"details.studentDetails.id":NumberInt(110)});这将产生以下输出-
{ "_id" : ObjectId("5e568fbaf8647eb59e5620ca"), "FirstName" : "David", "Age" : 23, "details" : { "studentDetails" : { "id" : 110 } } }