Morphling is a SQL wrapper for database replication topology. Morphling helps you to determine which connection to be used when execute query to the sql database. It's not an ORM
Why you need morphling ?
Golang sql package is allowed you to open multiple connection, but without any restriction, means any connection you
opened, can do all SQL manipulation (insert, update, delete, select), While slave database supposed to be only
allowed to do select , with morphling it manage the master slave connection usage.
Why morphling can only specify one replica ? We can use load balancer such as HAProxy or else to handle a replica set, its provide abstraction to how you want to handle your replica sets load, either round robin or else.
package main
import (
"fmt"
"github.com/ahartanto/morphling"
_ "github.com/go-sql-driver/mysql"
)
func main() {
var urlFormat = "%s:%s@tcp(%s:%d)/%s?charset=%s&parseTime=true&loc=Local"
// Prepare data source for master connection
masterUser := "user"
masterPassword := "password"
masterHost := "masterhost"
masterPort := "3306"
masterDBName := "dbname"
masterCharset := "utf8"
dataSourceMaster := fmt.Sprintf(urlFormat, masterUser, masterPassword,masterHost, masterPort, masterDBName, masterCharset)
// Prepare data source for slave connection
slaveUser := "user"
slavePassword := "password"
slaveHost := "slavehost"
slavePort := "3306"
slaveDBName := "dbname"
slaveCharset := "utf8"
dataSourceSlave := fmt.Sprintf(urlFormat, slaveUser, slavePassword,slaveHost, slavePort, slaveDBName, slaveCharset)
// Get database handler
db, err := morphling.OpenConnection(morphling.MySQLDriver, dataSourceMaster, dataSourceSlave)
if err != nil {
panic(fmt.Errorf("failed dial database : %v", err))
}
// Then you can do the query as golang sql package does
var id int
q := fmt.Sprintf("SELECT id FROM accounts LIMIT 1")
err = db.QueryRow(q).Scan(&id)
fmt.Printf(id)
}Fun fact, Morphling is a ranged agility dota hero that has many flexible abilities. His ultimate, Morph, transforms him into a copy of an enemy using their stats and basic abilities.
Morphling can be as an analogy of database replication, select / read data is a basic abilites that replica has,
while insert, update and delete is the main abilites.