摘要：
集合sales的定义如下： { "_id" : 1, "item" : "abc", "price" : 10, "quantity" : 2, "date" : ISODate("2014-03-01T08:00:00Z") } { "_id" : 2, "item" : "jkl", "pric 阅读全文
摘要：
package main import ( "fmt" "crypto/md5" "math/rand" "sort" "time" ) type MapEntryHandler func (string, string) // func printKeyValue(key string, valu 阅读全文