如何使用 MongoDB 根据特定属性显示对象列表?
mongodbdatabasebig data analytics更新于 2026/2/11 17:07:17
要根据特定属性显示对象列表，请在 find() 中使用点符号。让我们创建一个包含文档的集合 −
> db.demo455.insertOne({"Information":{"Student":[{"Name":"Chris","Age":22}]}});{
"acknowledged" : true,
"insertedId" : ObjectId("5e7e1876dbcb9adb296c95c5")
}
> db.demo455.insertOne({"Information":{"Student":[{"Name":"David","Age":21}]}});{
"acknowledged" : true,
"insertedId" : ObjectId("5e7e1883dbcb9adb296c95c6")
}
> db.demo455.insertOne({"Information":{"Student":[{"Name":"Bob","Age":24}]}});{
"acknowledged" : true,
"insertedId" : ObjectId("5e7e188adbcb9adb296c95c7")
}
> db.demo455.insertOne({"Information":{"Student":[{"Name":"Robert","Age":21}]}});{
"acknowledged" : true,
"insertedId" : ObjectId("5e7e18bcdbcb9adb296c95c8")
}
借助 find() 方法显示集合中的所有文档 −
> db.demo455.find();
这将产生以下输出 −
{ "_id" : ObjectId("5e7e1876dbcb9adb296c95c5"), "Information" : { "Student" : [ { "Name" :
"Chris", "Age" : 22 } ] } }
{ "_id" : ObjectId("5e7e1883dbcb9adb296c95c6"), "Information" : { "Student" : [ { "Name" :
"David", "Age" : 21 } ] } }
{ "_id" : ObjectId("5e7e188adbcb9adb296c95c7"), "Information" : { "Student" : [ { "Name" :
"Bob", "Age" : 24 } ] } }
{ "_id" : ObjectId("5e7e18bcdbcb9adb296c95c8"), "Information" : { "Student" : [ { "Name" :
"Robert", "Age" : 21 } ] } }
以下查询用于显示基于特定属性的对象列表 −
> db.demo455.find({"Information.Student.Age":21});
这将产生以下输出 −
{ "_id" : ObjectId("5e7e1883dbcb9adb296c95c6"), "Information" : { "Student" : [ { "Name" :
"David", "Age" : 21 } ] } }
{ "_id" : ObjectId("5e7e18bcdbcb9adb296c95c8"), "Information" : { "Student" : [ { "Name" :
"Robert", "Age" : 21 } ] } }
