在MongoDB数组中匹配元素？
您可以将$or运算符与limit(1)一起使用以匹配数组中的元素。首先让我们创建一个包含文档的集合-
> db.matchElementInArrayDemo.insertOne(
... {
... "StudentName" : "Chris" ,
... "StudentOtherDetails" :
... [
... {"StudentCountryName" : "US" , "StudentSkills" : "MongoDB"},
... {"StudentCountryName" : "UK" , "StudentSkills" : "Java"}
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd423282cba06f46efe9ee2")
}
> db.matchElementInArrayDemo.insertOne(
... {
... "StudentName" : "Chris" ,
... "StudentOtherDetails" :
... [
... {"StudentCountryName" : "AUS" , "StudentSkills" : "PHP"},
... {"StudentCountryName" : "US" , "StudentSkills" : "MongoDB"}
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd423412cba06f46efe9ee3")
}以下是在find()方法的帮助下显示集合中所有文档的查询-
> db.matchElementInArrayDemo.find().pretty();
这将产生以下输出-
{
"_id" : ObjectId("5cd423282cba06f46efe9ee2"),
"StudentName" : "Chris",
"StudentOtherDetails" : [
{
"StudentCountryName" : "US",
"StudentSkills" : "MongoDB"
},
{
"StudentCountryName" : "UK",
"StudentSkills" : "Java"
}
]
}
{
"_id" : ObjectId("5cd423412cba06f46efe9ee3"),
"StudentName" : "Chris",
"StudentOtherDetails" : [
{
"StudentCountryName" : "AUS",
"StudentSkills" : "PHP"
},
{
"StudentCountryName" : "US",
"StudentSkills" : "MongoDB"
}
]
}这是匹配MongoDB数组中的元素的查询-
> db.matchElementInArrayDemo.find( { $or : [ {"StudentOtherDetails.StudentCountryName": "US" } ,{"StudentOtherDetails.StudentSkills": "MongoDB" } ] } ).limit(1);这将产生以下输出-
{ "_id" : ObjectId("5cd423282cba06f46efe9ee2"), "StudentName" : "Chris", "StudentOtherDetails" : [ { "StudentCountryName" : "US", "StudentSkills" : "MongoDB" }, { "StudentCountryName" : "UK", "StudentSkills" : "Java" } ] }热门推荐
10 对患者生日祝福语简短
11 结婚祝福语简短装备
12 周岁祝福语学生文案简短
13 订婚领证祝福语简短精辟
14 导师获奖祝福语大全简短
15 新婚购房祝福语简短精辟
16 牛年祝福语简短的爱人
17 送芒果的祝福语简短
18 送给学长毕业祝福语简短