在MongoDB的双嵌套数组中搜索文本？
借助dot（。）表示法在MongoDB的双嵌套数组中搜索文本。让我们首先创建一个集合。以下是使用文档创建集合的查询
> db.doubleNestedArrayDemo.insertOne(
... {
... "StudentId" : "1000",
... "StudentName" : "Larry",
... "StudentDetails" : [
... {
... "ProjectName" : "Online Banking",
... "ProjectDetails" : [
... {
... "TechnologyUsed" : "Java"
... },
... {
... "TechnologyUsed" : "MySQL in Backend"
... }
... ]
... }
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5c992bd7330fd0aa0d2fe4cc")
}
> db.doubleNestedArrayDemo.insertOne( { "StudentId" : "1001", "StudentName" : "Robert", "StudentDetails" : [ { "ProjectName" : "Student Web Tracker", "ProjectDetails" : [ { "TechnologyUsed" : "Django Framework" }, { "TechnologyUsed" : "MongoDB in Backend" } ] } ] } );
{
"acknowledged" : true,
"insertedId" : ObjectId("5c992cdb330fd0aa0d2fe4cd")
}以下是在find()方法的帮助下显示集合中所有文档的查询
> db.doubleNestedArrayDemo.find().pretty()
这将产生以下输出
{
"_id" : ObjectId("5c992bd7330fd0aa0d2fe4cc"),
"StudentId" : "1000",
"StudentName" : "Larry",
"StudentDetails" : [
{
"ProjectName" : "Online Banking",
"ProjectDetails" : [
{
"TechnologyUsed" : "Java"
},
{
"TechnologyUsed" : "MySQL in Backend"
}
]
}
]
}
{
"_id" : ObjectId("5c992cdb330fd0aa0d2fe4cd"),
"StudentId" : "1001",
"StudentName" : "Robert",
"StudentDetails" : [
{
"ProjectName" : "Student Web Tracker",
"ProjectDetails" : [
{
"TechnologyUsed" : "Django Framework"
},
{
"TechnologyUsed" : "MongoDB in Backend"
}
]
}
]
}以下是在双嵌套数组中搜索的查询。我们正在查找带有文本“Java”的记录
>db.doubleNestedArrayDemo.find({"StudentDetails.ProjectDetails.TechnologyUsed":"Java"}).pretty();这将产生以下输出
{
"_id" : ObjectId("5c992bd7330fd0aa0d2fe4cc"),
"StudentId" : "1000",
"StudentName" : "Larry",
"StudentDetails" : [
{
"ProjectName" : "Online Banking",
"ProjectDetails" : [
{
"TechnologyUsed" : "Java"
},
{
"TechnologyUsed" : "MySQL in Backend"
}
]
}
]
}