如何在应用程序端记录Cassandra查询？

Question

I'm using gocql driver in my application. Is there a way for the driver to log queries on the console? How do I configure the logger to print complete queries (along with data bindings)

package main

import (
    "fmt"

    "github.com/gocql/gocql"
)

var Session *gocql.Session

type Emp struct {
    id        string
    firstName string
    lastName  string
    age       int
}

func init() {
    var err error

    cluster := gocql.NewCluster("localhost")
    cluster.Keyspace = "cms"
    Session, err = cluster.CreateSession()
    if err != nil {
        panic(err)
    }
    fmt.Println("cassandra init done")
}

func main() {
    e := Emp{
        id:        "1",
        firstName: "John",
        lastName:  "DOe",
        age:       88,
    }
    createEmp(e)
}
func createEmp(emp Emp) {
    fmt.Println(" **** Creating new emp ****
", emp)
    if err := Session.Query("INSERT INTO emps(empid, first_name, last_name, age) VALUES(?, ?, ?, ?)",
        emp.id, emp.firstName, emp.lastName, emp.age).Exec(); err != nil {
        fmt.Println("Error while inserting Emp")
        fmt.Println(err)
    }
}

Answer 1

This is how we do it in Java. We define a custom LatencyTracker:

private LatencyTracker getLatencyTracker() {
    return new LatencyTracker() {
        @Override
        public void update(Host host, Statement statement, Exception e, long l) {
            LOGGER.info(statement.toString());
        }

        @Override
        public void onRegister(Cluster cluster1) {

        }

        @Override
        public void onUnregister(Cluster cluster1) {

        }
    };
}

Then register it in the cluster:

cluster.register(getLatencyTracker());