我有以下地图:MongoDB的地图减少琐碎的查询
var mapFunction = function() {
if(this.url.match(/http:\/\/test.com\/category\/.*?\/checkout/)) {
var key=this.em;
var value = {
url : 'checkout',
count : 1,
account_id:this.accId
}emit(key,value); };
if(this.url.match(/http:\/\/test.com\/landing/)) {
var key=this.em;
var value = {
url : 'landing',
count : 1,
account_id:this.accId
}emit(key,value); };
}
然后我定义减少类似如下:
var reduceFunction = function (keys, values) {
var reducedValue = {count_checkout:0, count_landing:0};
for (var idx = 0; idx < values.length; idx++) {
if(values[idx].url=='checkout'){
reducedValue.count_checkout++;
}
else {
reducedValue.count_landing++;
}
}
return reducedValue;
}
现在,可以说我只有1个记录:
{
"_id" : ObjectId("516a7cff6dad5949ddf3f7b6"),
"ip" : "1.2.3.4",
"accId" : 123,
"em" : "[email protected]",
"pgLdTs" : ISODate("2013-04-11T18:30:00Z"),
"url" : "http://test.com/category/prr/checkout",
"domain" : "www.test.com",
"pgUdTs" : ISODate("2013-04-14T09:55:11.682Z"),
"title" : "Test",
"ua" : "Mozilla",
"res" : "1024*768",
"rfr" : "www.google.com"
}
现在,如果我的火我的地图减少如下:
db.test_views.mapReduce(mapFunction,reduceFunction,{out:{inline:1}})
的,我得到如下结果中返回:
{
"_id" : "[email protected]",
"value" : {
"url" : "checkout",
"count" : 1,
"account_id" : 123
}
}
因此,它基本上回到我的地图。现在,如果我为此电子邮件ID添加另一个文档。最后它变成如下所示。
{
"_id" : ObjectId("516a7cff6dad5949ddf3f7b6"),
"ip" : "1.2.3.4",
"accId" : 123,
"em" : "[email protected]",
"pgLdTs" : ISODate("2013-04-11T18:30:00Z"),
"url" : "http://test.com/category/prr/checkout",
"domain" : "www.test.com",
"pgUdTs" : ISODate("2013-04-14T09:55:11.682Z"),
"title" : "Test",
"ua" : "Mozilla",
"res" : "1024*768",
"rfr" : "www.google.com"
}
{
"_id" : ObjectId("516a7e1b6dad5949ddf3f7b7"),
"ip" : "1.2.3.4",
"accId" : 123,
"em" : "[email protected]",
"pgLdTs" : ISODate("2013-04-11T18:30:00Z"),
"url" : "http://test.com/category/prr/checkout",
"domain" : "www.test.com",
"pgUdTs" : ISODate("2013-04-14T09:59:55.326Z"),
"title" : "Test",
"ua" : "Mozilla",
"res" : "1024*768",
"rfr" : "www.google.com"
}
然后,我再去和消防地图降低,它给了我正确的结果
{
"_id" : "[email protected]",
"value" : {
"count_checkout" : 2,
"count_landing" : 0
}
}
任何人都可以请帮我理解为什么它返回我的地图为单一的文件和没有按”不要在减少计数。
感谢您的帮助。
-Lalit