MongoDB查询数组中的$ all
在MongoDB中，$all用于选择文档，其中字段的值是包含所有指定元素的数组
让我们创建一个包含文档的集合-
> db.demo163.insertOne(
... {
... "ClientDetails": [{
... "ClientName": "Chris"
...
... }, {
... "ClientName": "David"
...
... }
... ]
...
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3686d49e4f06af551997c5")
}
> db.demo163.insertOne(
... {
... "ClientDetails": [{
... "ClientName": "Mike"
...
... }, {
... "ClientName": "Sam"
...
... }
... ]
...
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3686d59e4f06af551997c6")
}
>
db.demo163.insertOne(
... {
... "ClientDetails": [{
... "ClientName": "Robert"
...
... }, {
... "ClientName": "Sam"
...
... }
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3686d59e4f06af551997c7")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo163.find();
这将产生以下输出-
{ "_id" : ObjectId("5e3686d49e4f06af551997c5"), "ClientDetails" : [ { "ClientName" : "Chris" }, { "ClientName" : "David" } ] }
{ "_id" : ObjectId("5e3686d59e4f06af551997c6"), "ClientDetails" : [ { "ClientName" : "Mike" }, { "ClientName" : "Sam" } ] }
{ "_id" : ObjectId("5e3686d59e4f06af551997c7"), "ClientDetails" : [ { "ClientName" : "Robert" }, { "ClientName" : "Sam" } ] }以下是在MongoDB中对$all的查询-
> db.demo163.find({"ClientDetails": {$all: [{"ClientName": "Mike"}, {"ClientName": "Sam"}]}});这将产生以下输出-
{ "_id" : ObjectId("5e3686d59e4f06af551997c6"), "ClientDetails" : [ { "ClientName" : "Mike" }, { "ClientName" : "Sam" } ] }