mgo

noob Golang and Sinatra person here. I have hacked a Sinatra app to accept an uploaded file posted from an HTML form and save it to a hosted MongoDB database via GridFS. This seems to work fine. I am writing the same app in Golang using the mgo driver. Functionally it works fine. However in my Golang code, I read the file into memory and then write the file from memory to the MongoDB using mgo. This appears much slower than my equivalent Sinatra app. I get the sense that the interaction between Rack and Sinatra does not execute this "middle" or "interim" step. Here's a snippet of my Go code:

I want to upsert a list of record, so I have two choice, one just use one session, another copy a session for every record. So, as my opinion, first method may slower than the second, but will the first one cause too many session created? 1.use one session func (this *CvStoreServiceImpl) SetCvJobItemMeasureList(accessToken *base_datatype.ServiceAccessToken, versionPolicy string, jobItemList []*cv_common_type.CvJobItemMeasure) (err error) { session := this.session.Clone() defer session.Close() for _, jobItem := range jobItemList { objKey := &orm.ItemIdKey{ VersionName: versionPolicy, //XXX

What I am looking is equivalent of Document.parse() in golang, that allows me create bson from json directly? I do not want to create intermediate golang structs for marshaling TheHippo The gopkg.in/mgo.v2/bson package has a function called UnmarshalJSON which does exactly what you want. The data parameter should hold you JSON string as []byte value. func UnmarshalJSON(data []byte, value interface{}) error UnmarshalJSON unmarshals a JSON value that may hold non-standard syntax as defined in BSON's extended JSON specification. Example: var bdoc interface{} err = bson.UnmarshalJSON([]byte(`{"id"

I would like to run the following query in golang using mgo in a pipeline. {"key1" : 1, "$or" : [{"key2" : 2}, {"key3" : 2}]} I have looked everywhere, but I cannot find an example like this. I have tried many different combinations, for example: ... pipeline := []bson.M{ bson.M{ "$match" : bson.M{ "key1" : 1, "$or" : bson.M{ "key2" : 2, "key3" : 2}, } ... } which compiles correctly, does not find anything. Any ideas? Thank you in advance Your mongo query can be translated to the following: pipeline := bson.D{ {"key1", 1}, {"$or", []interface{}{ bson.D{{"key2", 2}}, bson.D{{"key3", 2}}, }}, }

In MongoDB doing something like db.mycollection.find() returns all documents in a collection. When working in GoLang using the package labix.org/v2/mgo and I do for example: query := db.C("client").Find(); It complains that it requires input in the form of an interface. All I need to do is retrieve all documents and iterate through them and display each one for now. How do I achieve this effect? All examples I have seen seem to have filters in place. Found a solution: var results []client err := db.C("client").Find(nil).All(&results) if err != nil { // TODO: Do something about the error } else