go cassandra 示例 1

官方示例

实际项目示例https://my.oschina.net/u/3896587/blog/4943875

package main

import (
	"fmt"
	"github.com/gocql/gocql"
	"time"
)

func main() {
	// connect to the cluster
	var session *gocql.Session
	var cluster *gocql.ClusterConfig
	var err error

	cluster = gocql.NewCluster()
	cluster.Keyspace = "demo11"

	hosts := []string{"127.0.0.1:9042"}
	cluster.Hosts=hosts
	cluster.ProtoVersion = 4
	cluster.ConnectTimeout = 2 * time.Duration(time.Second)
	cluster.Timeout = 2 * time.Duration(time.Second)
	cluster.Consistency = gocql.Quorum
	cluster.NumConns=10
	cluster.Consistency = gocql.One

	session, err = cluster.CreateSession()

	if err != nil {

		panic(err)

	}
	defer session.Close()


	//unlogged batch, 进行批量插入，最好是partition key 一致的情况
	//t := time.Now()
	batch := session.NewBatch(gocql.UnloggedBatch)
	for i := 0; i < 100; i++ {
		batch.Query(`INSERT INTO bigrow (rowname, iplist) VALUES (?,?)`, fmt.Sprintf("name_%d", i),i)
	}

	if err := session.ExecuteBatch(batch); err != nil {
		fmt.Println("execute batch:", err)
	}
	//bt := time.Now().Sub(t).Nanoseconds()
	//
	//t = time.Now()
	//for i := 0; i < 100; i++ {
	//	session.Query(`INSERT INTO bigrow (rowname, iplist) VALUES (?,?)`, fmt.Sprintf("name_%d", i), fmt.Sprintf("ip_%d", i))
	//}
	//nt := time.Now().Sub(t).Nanoseconds()
	//
	//t = time.Now()
	//sbatch := session.NewBatch(gocql.UnloggedBatch)
	//for i := 0; i < 100; i++ {
	//	sbatch.Query(`INSERT INTO bigrow (rowname, iplist) VALUES (?,?)`, "samerow", fmt.Sprintf("ip_%d", i))
	//}
	//if err := session.ExecuteBatch(sbatch); err != nil {
	//	fmt.Println("execute batch:", err)
	//}
	//sbt := time.Now().Sub(t).Nanoseconds()
	//fmt.Println("bt:", bt, "sbt:", sbt, "nt:", nt)
	//
	////----------out put------------------
	//// ./rawtest
	//// bt: 5795593 sbt: 3003774 nt: 261775
	////------------------------------------
	//
	//// insert a tweet
	//if err := session.Query(`INSERT INTO tweet (timeline, id, text) VALUES (?, ?, ?)`,
	//	"me", gocql.TimeUUID(), "hello world").Exec(); err != nil {
	//	log.Fatal(err)
	//}
	//
	//var id gocql.UUID
	//var text string
	//
	///* Search for a specific set of records whose 'timeline' column matches
	// * the value 'me'. The secondary index that we created earlier will be
	// * used for optimizing the search */
	//if err := session.Query(`SELECT id, text FROM tweet WHERE timeline = ? LIMIT 1`,
	//	"me").Consistency(gocql.One).Scan(&id, &text); err != nil {
	//	log.Fatal(err)
	//}
	//fmt.Println("Tweet:", id, text)
	//
	//// list all tweets
	//iter := session.Query(`SELECT id, text FROM tweet WHERE timeline = ?`, "me").Iter()
	//for iter.Scan(&id, &text) {
	//	fmt.Println("Tweet:", id, text)
	//}
	//if err := iter.Close(); err != nil {
	//	log.Fatal(err)
	//}
	//
	//query := session.Query(`SELECT * FROM bigrow where rowname = ?`, "30")
	//// query := session.Query(`SELECT * FROM bigrow `)
	//
	//var m map[string]interface{}
	//m = make(map[string]interface{}, 10)
	//err := query.Consistency(gocql.One).MapScan(m)
	//if err != nil {
	//	log.Fatal(err)
	//}
	//fmt.Printf("%#v", m)
}

 

来源：oschina

链接：https://my.oschina.net/u/3896587/blog/4943855