使用正则表达式查找MongoDB中包含特定值的文档？
> db.demo469.insertOne({"StudentName":"John Doe"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e80532fb0f3fa88e227906b")
}
> db.demo469.insertOne({"StudentName":"Chris Brown"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e80533ab0f3fa88e227906c")
}
> db.demo469.insertOne({"StudentName":"John Smith"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e805341b0f3fa88e227906d")
}
> db.demo469.insertOne({"StudentName":"Jace Doe"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e805347b0f3fa88e227906e")
}
> db.demo469.insertOne({"StudentName":"David Miller"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e80534eb0f3fa88e227906f")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo469.find();
这将产生以下输出-
{ "_id" : ObjectId("5e80532fb0f3fa88e227906b"), "StudentName" : "John Doe" }
{ "_id" : ObjectId("5e80533ab0f3fa88e227906c"), "StudentName" : "Chris Brown" }
{ "_id" : ObjectId("5e805341b0f3fa88e227906d"), "StudentName" : "John Smith" }
{ "_id" : ObjectId("5e805347b0f3fa88e227906e"), "StudentName" : "Jace Doe" }
{ "_id" : ObjectId("5e80534eb0f3fa88e227906f"), "StudentName" : "David Miller" }以下是在MongoDB中查找包含特定值的文档的查询-
> db.demo469.find({'StudentName': {'$regex':'john', '$options':'i'}});这将产生以下输出-
{ "_id" : ObjectId("5e80532fb0f3fa88e227906b"), "StudentName" : "John Doe" }
{ "_id" : ObjectId("5e805341b0f3fa88e227906d"), "StudentName" : "John Smith" }