File README.SUSE of Package golang-googlecode-couch-go

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File README.SUSE of Package golang-googlecode-couch-go

Basic usage

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 := new(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 "_id"
    Rev string "_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 := new(Record)
current_rev, err := db.Retrieve(some_id, r)
r.Count = r.Count + 1
current_rev, err = db.EditWith(r, some_id, current_rev)
if err != nil {
    // edit failed, out of sync?
}

or, as with Insert, by embedding _id and _rev fields in the document structure

complete_r = new(CompleteRecord) // has Id and Rev
current_rev, err := db.Retrieve(some_id, complete_r)
complete_r.Count = complete_r.Count + 1
current_rev, err = db.Edit(complete_r)
if err != nil {
    // edit failed, out of sync?
}

Delete works as expected

if err := db.Delete(id, current_rev); 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.
Gotchas

couch-go uses the reflect package (by way of the json package) to read and write documents via the CouchDB API. reflect requires that struct fields are public (ie. begin with a capital letter) to read from and write to them. So, your document structures in Go must contain capitalized field names.

The behavior of the Insert and Edit classes of functions depend on the contents of the struct you pass to them

Places

File README.SUSE of Package golang-googlecode-couch-go

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