// 删除符合条件的文档collection.deleteMany(query,function(err,result){if(err)throwerr;console.log(result.result.n+" 条文档已删除");db.close();}); 1. 2. 3. 4. 5. 6. 总结 通过以上步骤,你可以实现在 MongoDB 中删除符合指定条件的文档。记得先连接数据库,选择集合,构建删除条件,然后执行删除操...
q : <query>, limit : <integer>, collation: <document>, hint: <document|string> }, ... ], comment: <any>, let: <document>, // Added in MongoDB 5.0 ordered: <boolean>, writeConcern: { <write concern> }, maxTimeMS: <integer> ...
mongodb目前没有或(or)操作符,只能用变通的办法代替,可以参考下面的链接: http://www.mongodb.org/display/DOCS/OR+operations+in+query+expressions 二、更新 mongodb更新有两个命令: 1).update()命令 db.collection.update( criteria, objNew, upsert, multi ) criteria : update的查询条件,类似sql update查...
如果你的MongoDB是2.6版本以后的,语法格式如下: db.collection.remove(<query>,{justOne: <boolean>,writeConcern: <document>}) 参数说明: query:(可选)删除的文档的条件。 justOne:(可选)如果设为true或1,则只删除一个文档。 writeConcern:(可选)抛出异常的级别。 db.users.remove({"name": "lecaf"})...
如果你的 MongoDB 是 2.6 版本以后的,语法格式如下: db.collection.remove( <query>, { justOne: <boolean>, writeConcern: <document> } ) 参数说明: query :(可选)删除的文档的条件。 justOne : (可选)如果设为 true 或 1,则只删除一个文档。 writeConcern :(可选)抛出异常的级别。 db.users...
MongoDB shell version: 1.8.2 connecting to: test > var startTime = new Date(); > > db.users.find({NewsId:"nxuvdqtjrrptoyildolesbkqmd"}); { "_id" : ObjectId("4e2ccc2ea1ca039d82b9e4b3"), "NewsId" : "nxuvdqtjrrptoyildolesbkqmd" } > > (new Date().getTime(...
语法格式如下: db.collection.update( <query>, <update>, { upsert: <boolean>, multi: <boolean>, writeConcern: <document> } ) #参数说明:对比update db1.t1 set name='EGON',sex='Male' where name='egon' and age=18; """ query : 相当于where条件。 update : update的对象和一些更新的操作...
Delete specific documents in thecometscollection. The following example illustrates using a query filter to delete documents where theirorbitalPeriodis greater than 5 and less than 85. CrudDelete.cs //delete code goeshere varresult = coll.DeleteMany(x => x.OrbitalPeriod >5&& x.OrbitalPeriod <85...
MongoDB Node.jsMongoDBDelete ❮ PreviousNext ❯ Delete Document To delete a record, or document as it is called in MongoDB, we use thedeleteOne()method. The first parameter of thedeleteOne()method is a query object defining which document to delete....
目录一、MySQL工具类二、MongoDB工具类三、数据同步实现代码一、MySQL工具类 # -*- encoding: utf-8 -*- import pymysql class MySQLUtil...return self.database.get_collection(collect_name)...