在 MongoDB $in 中设置正则表达式?
让我们创建一个带有文档的集合 -
> db.demo675.insertOne({ ... "ListOfNames":["John","Chris","David"]}); { "acknowledged" : true, "insertedId" : ObjectId("5ea3f5b404263e90dac943ef") } > db.demo675.insertOne({ "ListOfNames":["Bob","Johnson","Sam"]}); { "acknowledged" : true, "insertedId" : ObjectId("5ea3f5c804263e90dac943f0") } > db.demo675.insertOne({ "ListOfNames":["Jace","Sam"]}); { "acknowledged" : true, "insertedId" : ObjectId("5ea3f5d304263e90dac943f1") }
在集合中使用 find() 方法显示所有文档 -
> db.demo675.find();
这将产生以下输出 -
{ "_id" : ObjectId("5ea3f5b404263e90dac943ef"), "ListOfNames" : [ "John", "Chris", "David" ] } { "_id" : ObjectId("5ea3f5c804263e90dac943f0"), "ListOfNames" : [ "Bob", "Johnson", "Sam" ] } { "_id" : ObjectId("5ea3f5d304263e90dac943f1"), "ListOfNames" : [ "Jace", "Sam" ] }
以下是使用正则表达式和数组进行查询的查询 -
> db.demo675.find({"ListOfNames": {$in:[/John/,/J/]}});
这将产生以下输出 -
{ "_id" : ObjectId("5ea3f5b404263e90dac943ef"), "ListOfNames" : [ "John", "Chris", "David" ] } { "_id" : ObjectId("5ea3f5c804263e90dac943f0"), "ListOfNames" : [ "Bob", "Johnson", "Sam" ] } { "_id" : ObjectId("5ea3f5d304263e90dac943f1"), "ListOfNames" : [ "Jace", "Sam" ] }
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