在MongoDB中实施文本搜索
对于文本搜索，您需要将$text与$search一起使用。让我们创建一个包含文档的集合-
> db.demo156.createIndex({"StudentName":"text"});
{
"createdCollectionAutomatically" : true,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}
> db.demo156.insertOne({"StudentName":"Chris Brown"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3547e8fdf09dd6d08539e6")
}
> db.demo156.insertOne({"StudentName":"John Doe"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3547f2fdf09dd6d08539e7")
}
> db.demo156.insertOne({"StudentName":"John Smith"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3547f7fdf09dd6d08539e8")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo156.find();
这将产生以下输出-
{ "_id" : ObjectId("5e3547e8fdf09dd6d08539e6"), "StudentName" : "Chris Brown" }
{ "_id" : ObjectId("5e3547f2fdf09dd6d08539e7"), "StudentName" : "John Doe" }
{ "_id" : ObjectId("5e3547f7fdf09dd6d08539e8"), "StudentName" : "John Smith" }以下是在MongoDB中实现文本搜索的查询-
> db.demo156.find({ $text: { $search: "John" } } )这将产生以下输出-
{ "_id" : ObjectId("5e3547f7fdf09dd6d08539e8"), "StudentName" : "John Smith" }
{ "_id" : ObjectId("5e3547f2fdf09dd6d08539e7"), "StudentName" : "John Doe" }