MongoDB使用not和equal to 根据我的理解,您需要检查提供的phone是否已经存在于特定的_id和user。如果不存在,请更新它,否则抛出错误。 在这种情况下,要简单得多: /* if you are querying on "_id" field, you don't need anything else (i.e. "user") */const agent = await Agent.findById('5fbcc1fa...
例如,以下PyMongo查询使用 Python 的re.compile()方法来编译正则表达式: importre fornoMatchindb.inventory.find( {"item": {"$not": re.compile("^p.*") } } ): printnoMatch 提示 另请参阅: find() $set $gt $regex 简体中文 © 2024 MongoDB, Inc....
2019-12-24 13:46 −Not equal <> != operator on NULL 问题 Could someone please explain the following behavior in SQL? SELECT * FROM MyTable WHERE MyColumn != NULL (... ChuckLu 0 384 报错“bash: jps: command not found” 2019-12-09 17:35 −运行xcall.sh jps时提示,报错“bash: ...
MongoDB使用not和equal to 根据我的理解,您需要检查提供的phone是否已经存在于特定的_id和user。如果不存在,请更新它,否则抛出错误。 在这种情况下,要简单得多: /* if you are querying on "_id" field, you don't need anything else (i.e. "user") */const agent = await Agent.findById('5fbcc1fa...
If we talk about MongoDB, querying “is not null” means that a field in a document exists and can be anything but not “null”. To query for “is not null” documents we can use the$neoperator. The $ne operator or not equal operator helps us to query for values that are not equal...
As we can ssee, document with _id:1 has a val field that is equal to null. When we query for the document that is null, everything works in the expected way: > db.sample.find({val:null}) { _id: 1, val: null } So far, so good! However, one thing to n...
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MongoClient.connect(db_url, { useNewUrlParser: true }, function(err, db) { assert.equal(null, err); assert.ok(db != null); //acl_id db.collection("numbs").findAndModify({ _id: seq_name }, [], { $inc: { seq: 1 } }, { new: true }, function(err, result) { if (err)...
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get empty due to $ne: country != Malaysia instead of equal Expected behavior $match aggregate should return: [ { $match: { $expr: { $and: [ { $and: [ { $eq: [ "$status", 1, ], }, { $ne: [ "$status", "$$REMOVE", ], }, ], }, { $and: [ { $and: [ { $not:...