MongoDB 查询中是否可以使用转换类型?
是的,可以在 MongoDB 查询中进行转换类型
db.yourCollectionName.find("this.yourFieldName >yourValue);
为了理解这个概念,我们使用文档创建一个集合。创建带文档的集合的查询如下所示:
> db.castingDemo.insertOne({"Amount":"200"}); { "acknowledged" : true, "insertedId" : ObjectId("5c947e874cf1f7a64fa4df42") } > db.castingDemo.insertOne({"Amount":"100"}); { "acknowledged" : true, "insertedId" : ObjectId("5c947e8e4cf1f7a64fa4df43") } > db.castingDemo.insertOne({"Amount":"110"}); { "acknowledged" : true, "insertedId" : ObjectId("5c947e944cf1f7a64fa4df44") } > db.castingDemo.insertOne({"Amount":"95"}); { "acknowledged" : true, "insertedId" : ObjectId("5c947e9d4cf1f7a64fa4df45") } > db.castingDemo.insertOne({"Amount":"85"}); { "acknowledged" : true, "insertedId" : ObjectId("5c947ea44cf1f7a64fa4df46") } > db.castingDemo.insertOne({"Amount":"75"}); { "acknowledged" : true, "insertedId" : ObjectId("5c947ebd4cf1f7a64fa4df47") }
使用 find() 方法显示集合中的所有文档。查询如下所示:
> db.castingDemo.find().pretty();
以下为输出:
{ "_id" : ObjectId("5c947e874cf1f7a64fa4df42"), "Amount" : "200" } { "_id" : ObjectId("5c947e8e4cf1f7a64fa4df43"), "Amount" : "100" } { "_id" : ObjectId("5c947e944cf1f7a64fa4df44"), "Amount" : "110" } { "_id" : ObjectId("5c947e9d4cf1f7a64fa4df45"), "Amount" : "95" } { "_id" : ObjectId("5c947ea44cf1f7a64fa4df46"), "Amount" : "85" } { "_id" : ObjectId("5c947ebd4cf1f7a64fa4df47"), "Amount" : "75" }
这是一个自动将字符串转换为数字的查询:
> db.castingDemo.find("this.Amount > 85");
以下为输出:
{ "_id" : ObjectId("5c947e874cf1f7a64fa4df42"), "Amount" : "200" } { "_id" : ObjectId("5c947e8e4cf1f7a64fa4df43"), "Amount" : "100" } { "_id" : ObjectId("5c947e944cf1f7a64fa4df44"), "Amount" : "110" } { "_id" : ObjectId("5c947e9d4cf1f7a64fa4df45"), "Amount" : "95" }
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