如何在MongoDB中删除文档？
要删除文档，请使用remove()。让我们创建一个包含文档的集合-
> db.demo79.insertOne({"Name":"Chris"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2bdb2271bf0181ecc42293")
}
> db.demo79.insertOne({"Name":"David"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2bdb2671bf0181ecc42294")
}
> db.demo79.insertOne({"Name":"Bob"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2bdb2971bf0181ecc42295")
}
> db.demo79.insertOne({"Name":"Mike"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2bdb2c71bf0181ecc42296")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo79.find();
这将产生以下输出-
{ "_id" : ObjectId("5e2bdb2271bf0181ecc42293"), "Name" : "Chris" }
{ "_id" : ObjectId("5e2bdb2671bf0181ecc42294"), "Name" : "David" }
{ "_id" : ObjectId("5e2bdb2971bf0181ecc42295"), "Name" : "Bob" }
{ "_id" : ObjectId("5e2bdb2c71bf0181ecc42296"), "Name" : "Mike" }以下是删除MongoDB中的文档的查询-
> db.demo79.remove({"Name":"Bob"});
WriteResult({ "nRemoved" : 1 })在find()方法的帮助下显示集合中的所有文档-
> db.demo79.find();
这将产生以下输出。我们成功删除了一个文档-
{ "_id" : ObjectId("5e2bdb2271bf0181ecc42293"), "Name" : "Chris" }
{ "_id" : ObjectId("5e2bdb2671bf0181ecc42294"), "Name" : "David" }
{ "_id" : ObjectId("5e2bdb2c71bf0181ecc42296"), "Name" : "Mike" }