例子:
> db.stuff.save({"foo":"bar"});
> db.stuff.find({"foo":"bar"}).count();
1
> db.stuff.find({"foo":"BAR"}).count();
0
当前回答
你可以使用不区分大小写的索引:
下面的示例创建一个没有默认排序规则的集合，然后在名称字段上添加一个索引，排序规则不区分大小写。Unicode国际组件
/* strength: CollationStrength.Secondary
* Secondary level of comparison. Collation performs comparisons up to secondary * differences, such as diacritics. That is, collation performs comparisons of
* base characters (primary differences) and diacritics (secondary differences). * Differences between base characters takes precedence over secondary
* differences.
*/
db.users.createIndex( { name: 1 }, collation: { locale: 'tr', strength: 2 } } )
要使用索引，查询必须指定相同的排序规则。
db.users.insert( [ { name: "Oğuz" },
{ name: "oğuz" },
{ name: "OĞUZ" } ] )
// does not use index, finds one result
db.users.find( { name: "oğuz" } )
// uses the index, finds three results
db.users.find( { name: "oğuz" } ).collation( { locale: 'tr', strength: 2 } )
// does not use the index, finds three results (different strength)
db.users.find( { name: "oğuz" } ).collation( { locale: 'tr', strength: 1 } )
或者你可以创建一个默认排序规则的集合:
db.createCollection("users", { collation: { locale: 'tr', strength: 2 } } )
db.users.createIndex( { name : 1 } ) // inherits the default collation
其他回答
db.zipcodes.find({city : "NEW YORK"}); // Case-sensitive
db.zipcodes.find({city : /NEW york/i}); // Note the 'i' flag for case-insensitivity
使用正则表达式, 如果任何其他选项都不适合您，RegExp是一个不错的选择。它使字符串不区分大小写。
var username = new RegExp("^" + "John" + "$", "i");;
使用用户名在查询，然后它完成。
我希望这对你也有用。愿一切都好！
对于任何使用Golang并希望使用mongodb和mgo godoc globalsign库进行区分大小写的全文搜索的人。
collation := &mgo.Collation{
Locale: "en",
Strength: 2,
}
err := collection.Find(query).Collation(collation)
db.company_profile.find({ "companyName" : { "$regex" : "Nilesh" , "$options" : "i"}});
搜索变量并转义:
const escapeStringRegexp = require('escape-string-regexp')
const name = 'foo'
db.stuff.find({name: new RegExp('^' + escapeStringRegexp(name) + '$', 'i')})
转义变量可以保护查询不受'攻击。*'或其他正则表达式。
escape-string-regexp
