[英]How to use regex with MongoDB's distinct command?
MongoDB's distinct command is perfect for what I'm trying to achieve, which is get a unique set of results for a particular key in a collection. MongoDB独特的命令非常适合我要实现的目标,它可以为集合中的特定键获取一组唯一的结果。
I've read that it supports regex, but I can't work out how to incorporate it into the query. 我读过它支持正则表达式,但是我不知道如何将其合并到查询中。
So this: 所以这:
db.runCommand({distinct:'cars',key:'car_company.name'})
Would return 会回来
{
"values" : [
"Chevy",
"Porche",
"Chevrolet",
"BMW",
"Mercedes-Benz",
],
"stats" : {
"n" : 5,
"nscanned" : 5,
"nscannedObjects" : 5,
"timems" : 0,
"cursor" : "BasicCursor"
},
"ok" : 1
}
How would I build this query so that it only returns the unique values that match a regex of say, 'chev'? 我将如何构建此查询,使其仅返回与正则表达式“ chev”匹配的唯一值?
In php
you can achieve this by doing 在
php
您可以通过执行此操作
$cars = $db->command(
array(
"distinct" => "car_collection",
"key" => "car_company.name", // or what so ever key you wish to be distinct
"query" => array("car_company.name" => new MongoRegex("/^chev/i"))
)
);
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