gocb：批量获取操作示例

Question

The recently released gocb lib (the official golang client for couchbase) offers API for performing bulk operations (Get, Delete, etc). I would love to see a complete example of such an operation, alas - my go skills are lacking and there's nothing online.

I'd like to see a snippet that (1) compiles and (2) performs multi-get and finally (3) manages to access the values returned from couchbase.

here's what little documentation exists online: http://developer.couchbase.com/documentation/server/4.0/sdks/go-beta/bulk-operations.html

the following code (which performs insert) is not enough: I want Get (and specifically - how one would review the contents of the get-operation results).

myBucket, _ := myCluster.OpenBucket("default", "")

var items []gocb.BulkOp
items = append(items, &gocb.InsertOp{Key: "document_name_1", Value: "Hello World 1"})
items = append(items, &gocb.InsertOp{Key: "document_name_2", Value: "Hello World 2"})

err := bucket.Do(items)

Answer 1

Just replace the *InsertOp values with *GetOp values, then read their Value field:

package main

import "fmt"
import "gopkg.in/couchbaselabs/gocb.v1"

func main() {
        getKeys()
}

func getKeys() {
        myCluster, err := gocb.Connect("couchbase://<couchbase-address>")
        if err != nil {
                fmt.Println("cluster error:", err)
        }
        myBucket, err := myCluster.OpenBucket("Test", "") //case sensitive!
        if err != nil {
                fmt.Println("bucket error:", err)
        }

        var items []gocb.BulkOp
        items = append(items, &gocb.GetOp{Key: "document_name_1"})
        items = append(items, &gocb.GetOp{Key: "document_name_2"})

        err = myBucket.Do(items)

        if err != nil {
                fmt.Println("Do error:", err)
                panic(err)
        }

        for _, g := range items {
                //"downcast" the instance back to its concrete type - GetOp
                t := g.(*gocb.GetOp)
                fmt.Println(t)
        }
}