couch-go is no longer maintained. I recommend looking at go-couchbase.
Couch-go is a simple CouchDB (0.9+) API for the Google Go language. It supports basic operations on documents.
Install Go. Then,
$ go get github.com/peterbourgon/couch-go
As with all go get-ted packages, you'll need to use a specially-formatted import line
import "github.com/peterbourgon/couch-go"
First, create a Database object to represent the DB you'll be interacting with
db, err := couch.NewDatabase("127.0.0.1", "5984", "databasename")
A CouchDB document is represented by a Go struct
type Record struct {
Type string
Count uint64
Elements []string
MyMap map[string]string
}
You can Insert these documents directly
r := Record{...}
id, rev, err := db.Insert(r)
and Retrieve them by ID.
r := Record{}
rev, err := db.Retrieve(id, &r)
If you want to specify document IDs, rather than have them auto-generated, you can use the InsertWith function
r := Record{...}
_, rev, err := db.InsertWith(r, "record_001")
or embed the _id in your document structure
type CompleteRecord struct {
Id string `json:"_id"`
Rev string `json:"_rev"` // useful only for Retrieve and Edit
Foo string
Count uint64
}
r := CompleteRecord{Id:"id001", Rev:"", Foo:"abc", Count:0}
_, rev, err := db.Insert(r)
You can also Edit a document, either by manually specifying the id and current revision
r := Record{}
currentRev, err := db.Retrieve(id, &r)
r.Count = r.Count + 1
nextRev, err := db.EditWith(r, id, currentRev)
if err != nil {
// edit failed, out of sync?
}
or, as with Insert, by embedding _id and _rev fields in the document structure
r = CompleteRecord{} // has Id and Rev
currentRev, err := db.Retrieve(id, &r)
r.Count = r.Count + 1
nextRev, err := db.Edit(&r)
if err != nil {
// edit failed, out of sync?
}
Delete works as expected
if err := db.Delete(id, currentRev); err != nil {
// delete failed, out of sync?
}
You can also perform simple queries on views
func (p Database) Query(view string, options map[string]interface{}) ([]string, os.Error)
Check the source for more details.
The behavior of the Insert and Edit classes of functions depend on the contents of the struct you pass to them.
Function Struct contains Behavior
------------- ------------------------ ------------------------------------------------
Insert both _id and _rev same as Edit (attempts overwrite)
only _id same as InsertWith(id)
no _id autogenerates new id
InsertWith neither _id nor _rev uses passed id
either _id or _rev undefined
Edit both _id and _rev will attempt to overwrite existing doc
missing _id or _rev error
EditWith either _id or _rev struct values overwritten by explicit values