MongoDB 查询以多文档字段进行完全匹配
对于完全匹配,请将要匹配的值设置在 MongoDB 的 $in() 内。让我们先创建一个包含以下文档的集合 -
> db.demo422.insertOne({"Name":"Chris","Marks":34}); { "acknowledged" : true, "insertedId" : ObjectId("5e73a4059822da45b30346e1") } > db.demo422.insertOne({"Name":"Chris","Marks":56}); { "acknowledged" : true, "insertedId" : ObjectId("5e73a40a9822da45b30346e2") } > db.demo422.insertOne({"Name":"David","Marks":78}); { "acknowledged" : true, "insertedId" : ObjectId("5e73a4149822da45b30346e3") } > db.demo422.insertOne({"Name":"Sam","Marks":45}); { "acknowledged" : true, "insertedId" : ObjectId("5e73a41e9822da45b30346e4") } > db.demo422.insertOne({"Name":"David","Marks":89}); { "acknowledged" : true, "insertedId" : ObjectId("5e73a4239822da45b30346e5") }
使用 find() 方法从一个集合中显示所有文档 -
> db.demo422.find();
这将生成以下输出 -
{ "_id" : ObjectId("5e73a4059822da45b30346e1"), "Name" : "Chris", "Marks" : 34 } { "_id" : ObjectId("5e73a40a9822da45b30346e2"), "Name" : "Chris", "Marks" : 56 } { "_id" : ObjectId("5e73a4149822da45b30346e3"), "Name" : "David", "Marks" : 78 } { "_id" : ObjectId("5e73a41e9822da45b30346e4"), "Name" : "Sam", "Marks" : 45 } { "_id" : ObjectId("5e73a4239822da45b30346e5"), "Name" : "David", "Marks" : 89 }
以下是查询同时在多个文档字段上进行精确匹配的记录 -
> db.demo422.find({'$and': [{'Name': {'$in': ['Chris', 'David']}, 'Marks': {'$in': [34,89]}}]});
这将生成以下输出 -
{ "_id" : ObjectId("5e73a4059822da45b30346e1"), "Name" : "Chris", "Marks" : 34 } { "_id" : ObjectId("5e73a4239822da45b30346e5"), "Name" : "David", "Marks" : 89 }
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