查询 MongoDB 中的子集并获取记录
mongodbdatabasebig data analytics更新于 2026/1/19 4:37:17
您可以使用 $all 运算符。首先，我们创建一个包含文档的集合 −
> db.subsetOfAnArrayDemo.insertOne({"StudentProgrammingSkills":
["Java","MongoDB","MySQL","C++","Data Structure","Algorithm","Python","Oracle","SQL Server"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cb9d1e1895c4fd159f80804")
}
以下是使用 find() 方法显示集合中的所有文档的查询 −
> db.subsetOfAnArrayDemo.find().pretty();
这将产生以下输出 −
{
"_id" : ObjectId("5cb9d1e1895c4fd159f80804"),
"StudentProgrammingSkills" : [
"Java",
"MongoDB",
"MySQL",
"C++",
"Data Structure",
"Algorithm",
"Python",
"Oracle",
"SQL Server"
]
}
以下是获取数组子集的查询 −
> db.subsetOfAnArrayDemo.find({ StudentProgrammingSkills:
{ $all: [ 'MongoDB', 'MySQL' ] } } ).pretty();
这将产生以下输出 −
{
"_id" : ObjectId("5cb9d1e1895c4fd159f80804"),
"StudentProgrammingSkills" : [
"Java",
"MongoDB",
"MySQL",
"C++",
"Data Structure",
"Algorithm",
"Python",
"Oracle",
"SQL Server"
]
}
