1、比较条件查询:db.collectionname.find(Conditions) 2、逻辑条件查询 1)and条件 MongoDB的find()⽅法可以传⼊多个键(key),每个键(key)以逗号隔开,即常规SQL的AND条件db.集合名.find({key1:value1, key2:value2}).pretty() 2)or条件 db.集合名.find({$or:[{key1:value1}, {key2:value2}]})...
> db.things.find( { a : { $size : 2 } } ); > > db.things.find( { a : { $size : 1 } } ); > $where 复制代码代码如下: > db.mycollection.find( { $where : function() { return this.a == 3 || this.b == 4; } } ); //同上效果 > db.mycollection.find( function(...
(url, (err, client) => { if (err) { console.error('Failed to connect to MongoDB:', err); return; } const db = client.db(dbName); const collectionName = 'yourCollectionName'; const query = { yourField: 'yourValue' }; findDocuments(db, collectionName, query); client.close...
db.collection.find(query).explain("executionStats")复合索引：如果你的查询条件包含多个字段，可以考虑建...
db.collection.find({ field: { $gt: 10 } }) 上述示例中,field是要检查的字段,$gt表示大于,10是要比较的值。这个查询操作将返回所有field字段的值大于10的文档。 对于条件检查列值的应用场景,可以包括但不限于: 数据筛选:通过条件检查列值,可以筛选出满足特定条件的文档,从而实现数据的过滤和查询。 数据更新...
Model.deleteMany(conditions,callback); 查 普通查询: 查询所有: Model.find(conditions,[projection],[options],callback); 根据Id属性查询: Model.findById(Id,[projection],[options],callback); 查询符合条件的第一个文档 Model.findOne(conditions,[projection],[options],callback); ...
If the later is what you need, it would be way simpler to make to find requests: db.article.find({title: {$regex:/example/} }) and db.article_category.find({all_category_id:8}) Share Copy link Follow editedJan 30, 2018 at 11:08 ...
db.customers.find( { "package":"Free", "registered_on":{$gt:new Date("1989-12-31")} } ); Notice that the two search conditions are enclosed in curly braces and separated by a comma. The first search condition specifies that a document’s package field value must equal Free. The ...
TrueFalseTrueFalseTrueFalseStartCondition 1Result 1Condition 2Result 2Condition 3Result 3End Class Diagram **Collection+name: String+find(conditions: Object) : ArrayMongodb+collections: Array+createCollection(name: String) : CollectionQuery+conditions: Object ...
>db.users.find({"age":18}).explain({"verbose":true}){"cursor":"BtreeCursor age_1_sex_1","isMultiKey":false,"n":9777,"nscannedObjects":9777,"nscanned":9777,"millis":1686,"allPlans":[{"cursor":"BtreeCursor age_1_sex_1","n":9777,"nscannedObjects":9777,"nscanned":9777,}],"ol...