如何在 MongoDB 未索引字段上高效运行复杂查询?
mongodbdatabasebig data analytics更新于 2026/2/13 4:07:17
创建索引以高效运行复杂查询。首先，我们创建一个包含文档的集合 −
> db.demo400.insertOne({SubjectName:"Java Spring"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e610720fac4d418a0178572")
}
> db.demo400.insertOne({SubjectName:"Spring Hibernate"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e61072dfac4d418a0178573")
}
> db.demo400.insertOne({SubjectName:"Java Hibernate"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e610736fac4d418a0178574")
}
> db.demo400.createIndex({SubjectName:"text"});
{
"createdCollectionAutomatically" : false,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}
借助 find() 方法显示集合中的所有文档 −
> db.demo400.find();
这将产生以下输出 −
{ "_id" : ObjectId("5e610720fac4d418a0178572"), "SubjectName" : "Java Spring" }
{ "_id" : ObjectId("5e61072dfac4d418a0178573"), "SubjectName" : "Spring Hibernate" }
{ "_id" : ObjectId("5e610736fac4d418a0178574"), "SubjectName" : "Java Hibernate" }
以下是针对未索引字段有效执行复杂查询的查询 −
> db.demo400.find({ $text: { $search: "Spring" } } )
这将产生以下输出 −
{ "_id" : ObjectId("5e61072dfac4d418a0178573"), "SubjectName" : "Spring Hibernate" }
{ "_id" : ObjectId("5e610720fac4d418a0178572"), "SubjectName" : "Java Spring" }
