使用golang和mgo，如何在MongoDB中搜索一系列值？

Question

我在mgo主页上浏览了该示例，但是我一直在努力寻找一种查询一系列值的方法。该行：searchResults, searchErr = SearchReading(bson.M{"k": key, "t": { $gte: start, $lte: end } }, limit)失败并显示：line67: syntax error: unexpected $line67: missing type in composite literal我省去了不必要的代码...type Reading struct {    K string  "k"    T int64   "t"    V float64 "v"}func SearchReading(q interface{}, limit int) (searchResults []Reading, searchErr string) {    searchErr = ""    searchResults = []Reading{}    query := func(c *mgo.Collection) error {        fn := c.Find(q).Limit(limit).All(&searchResults)        if limit < 0 {            fn = c.Find(q).All(&searchResults)        }        return fn    }    search := func() error {        return withCollection("reading", query)    }    err := search()    if err != nil {        searchErr = "Database Error"    }    return}func GetReadingsForKey(key string, start int64, end int64, limit int) (searchResults []Reading, searchErr string) {    searchResults, searchErr = SearchReading(bson.M{"k": key, "t": { $gte: start, $lte: end } }, limit)    return}

Answer 1

该行：

searchResults, searchErr = SearchReading(bson.M{"k": key, "t": { $gte: start, $lte: end } }, limit)

需要更改为：

searchResults, searchErr = SearchReading(bson.M{"k": key, "t": bson.M{"$gte": start, "$lte": end}}, limit)