MongoDB findOneAndUpdate()更新单个文档
将findOneAndUpdate()用于更新仅在MongoDB中一个文件。让我们创建一个包含文档的集合-
db.demo349.insertOne({"Name":"Chris","Marks":56});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e55384af8647eb59e5620b4")
}
> db.demo349.insertOne({"Name":"David","Marks":78});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e553853f8647eb59e5620b5")
}
> db.demo349.insertOne({"Name":"Chris","Marks":89});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e55385af8647eb59e5620b6")
}
> db.demo349.insertOne({"Name":"David","Marks":54});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e55385ff8647eb59e5620b7")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo349.find();
这将产生以下输出-
{ "_id" : ObjectId("5e55384af8647eb59e5620b4"), "Name" : "Chris", "Marks" : 56 }
{ "_id" : ObjectId("5e553853f8647eb59e5620b5"), "Name" : "David", "Marks" : 78 }
{ "_id" : ObjectId("5e55385af8647eb59e5620b6"), "Name" : "Chris", "Marks" : 89 }
{ "_id" : ObjectId("5e55385ff8647eb59e5620b7"), "Name" : "David", "Marks" : 54 }以下是与MongoDB中的findOneAndUpdate配合使用的查询-
> db.demo349.findOneAndUpdate({ "Name" : "David" },{$inc:{Marks:10}});
{
"_id" : ObjectId("5e553853f8647eb59e5620b5"),
"Name" : "David",
"Marks" : 78
}在find()方法的帮助下显示集合中的所有文档-
> db.demo349.find();
这将产生以下输出-
{ "_id" : ObjectId("5e55384af8647eb59e5620b4"), "Name" : "Chris", "Marks" : 56 }
{ "_id" : ObjectId("5e553853f8647eb59e5620b5"), "Name" : "David", "Marks" : 88 }
{ "_id" : ObjectId("5e55385af8647eb59e5620b6"), "Name" : "Chris", "Marks" : 89 }
{ "_id" : ObjectId("5e55385ff8647eb59e5620b7"), "Name" : "David", "Marks" : 54 }热门推荐
10 朋友新年祝福语大全 简短
11 新年祝福语简短大方兔年
12 搬新家礼物祝福语简短
13 同学见面花束祝福语简短
14 五一假期祝福语幽默简短
15 离职欢送敬酒祝福语简短
16 对学弟的祝福语简短
17 考老师辞职祝福语简短
18 祝福语驱散霉运的话简短