MongoDB查询用于特定的不区分大小写的搜索
首先让我们创建一个包含文档的集合-
> db.demo186.insertOne({"UserEmailId":"JOHN@GMAIL.COM","UserName":"John"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e399d769e4f06af55199808")
}
> db.demo186.insertOne({"UserEmailId":"chris@gmail.com","UserName":"chris"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e399d879e4f06af55199809")
}
> db.demo186.insertOne({"UserEmailId":"DAVID@GMAIL.COM","UserName":"David"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e399d979e4f06af5519980a")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo186.find();
这将产生以下输出-
{ "_id" : ObjectId("5e399d769e4f06af55199808"), "UserEmailId" : "JOHN@GMAIL.COM", "UserName" : "John" }
{ "_id" : ObjectId("5e399d879e4f06af55199809"), "UserEmailId" : "chris@gmail.com", "UserName" : "chris" }
{ "_id" : ObjectId("5e399d979e4f06af5519980a"), "UserEmailId" : "DAVID@GMAIL.COM", "UserName" : "David" }以下是不区分大小写搜索的查询-
> var userMailId = [ /john@gmail.com/i, /david@gmail.com/i ]
> db.demo186.find({
... '$or': [
... { 'UserEmailId': { '$in': userMailId} },
... { 'UserName': 'John' }
... ]
...})这将产生以下输出-
{ "_id" : ObjectId("5e399d769e4f06af55199808"), "UserEmailId" : "JOHN@GMAIL.COM", "UserName" : "John" }
{ "_id" : ObjectId("5e399d979e4f06af5519980a"), "UserEmailId" : "DAVID@GMAIL.COM", "UserName" : "David" }