如何在MongoDB中进行字母数字排序?
您需要设置numericOrdering:对于字母数字排序为true。首先让我们创建一个包含文档的集合-
> db.alphanumericSortDemo.insertOne({"StudentId":"STU1010"}); { "acknowledged" : true, "insertedId" : ObjectId("5ccf149adceb9a92e6aa194c") } > db.alphanumericSortDemo.insertOne({"StudentId":"STU1101"}); { "acknowledged" : true, "insertedId" : ObjectId("5ccf14a2dceb9a92e6aa194d") } > db.alphanumericSortDemo.insertOne({"StudentId":"STU1901"}); { "acknowledged" : true, "insertedId" : ObjectId("5ccf14a9dceb9a92e6aa194e") } > db.alphanumericSortDemo.insertOne({"StudentId":"STU908"}); { "acknowledged" : true, "insertedId" : ObjectId("5ccf14aedceb9a92e6aa194f") } > db.alphanumericSortDemo.insertOne({"StudentId":"STU101"}); { "acknowledged" : true, "insertedId" : ObjectId("5ccf14b2dceb9a92e6aa1950") }
以下是在find()
方法的帮助下显示集合中所有文档的查询-
> db.alphanumericSortDemo.find().pretty();
这将产生以下输出-
{ "_id" : ObjectId("5ccf149adceb9a92e6aa194c"), "StudentId" : "STU1010" } { "_id" : ObjectId("5ccf14a2dceb9a92e6aa194d"), "StudentId" : "STU1101" } { "_id" : ObjectId("5ccf14a9dceb9a92e6aa194e"), "StudentId" : "STU1901" } { "_id" : ObjectId("5ccf14aedceb9a92e6aa194f"), "StudentId" : "STU908" } { "_id" : ObjectId("5ccf14b2dceb9a92e6aa1950"), "StudentId" : "STU101" }
情况1- 当您希望结果按升序排列时。
这是在MongoDB中执行字母数字排序的查询-
> db.alphanumericSortDemo.find({}).sort({"StudentId" : 1}).collation( { locale: "en_US", numericOrdering: true });
这将产生以下输出-
{ "_id" : ObjectId("5ccf14b2dceb9a92e6aa1950"), "StudentId" : "STU101" } { "_id" : ObjectId("5ccf14aedceb9a92e6aa194f"), "StudentId" : "STU908" } { "_id" : ObjectId("5ccf149adceb9a92e6aa194c"), "StudentId" : "STU1010" } { "_id" : ObjectId("5ccf14a2dceb9a92e6aa194d"), "StudentId" : "STU1101" } { "_id" : ObjectId("5ccf14a9dceb9a92e6aa194e"), "StudentId" : "STU1901" }
情况2-当您希望结果按降序排列时。
这是在MongoDB中执行字母数字排序的查询-
> db.alphanumericSortDemo.find({}).sort({"StudentId" : -1}).collation( { locale: "en_US", numericOrdering: true });
这将产生以下输出-
{ "_id" : ObjectId("5ccf14a9dceb9a92e6aa194e"), "StudentId" : "STU1901" } { "_id" : ObjectId("5ccf14a2dceb9a92e6aa194d"), "StudentId" : "STU1101" } { "_id" : ObjectId("5ccf149adceb9a92e6aa194c"), "StudentId" : "STU1010" } { "_id" : ObjectId("5ccf14aedceb9a92e6aa194f"), "StudentId" : "STU908" } { "_id" : ObjectId("5ccf14b2dceb9a92e6aa1950"), "StudentId" : "STU101" }