Golang : Update database with GORM example
A simple tutorial on how to use GORM(Golang Object Relational Map) to connect to a MySQL/MariaDB database and UPDATE data.
Here you go!
package main
import (
"fmt"
_ "github.com/go-sql-driver/mysql"
"github.com/jinzhu/gorm"
"time"
)
// Activities table SQL :
// id bigint(20) AUTO_INCREMENT
// username varchar(50)
// created_on timestamp
// action char(1)
// description varchar(300)
// visibility char(1)
// NOTE : In the struct, CreatedOn will be translated into created_on in sql level
type Activities struct {
Id int `sql:"AUTO_INCREMENT"`
Username string `sql:"varchar(50);unique"`
CreatedOn time.Time `sql:"timestamp"`
Action string `sql:"type:char(1)"`
Description string `sql:"type:varchar(300)"`
Visibility string `sql:"type:char(1)"`
}
func main() {
dbConn, err := gorm.Open("mysql", "username:password@tcp(x0.xx0.xxx.xxx:3306)/db_name?charset=utf8&parseTime=true")
if err != nil {
fmt.Println(err)
}
dbConn.DB()
dbConn.DB().Ping()
dbConn.DB().SetMaxIdleConns(10)
dbConn.DB().SetMaxOpenConns(100)
activity := Activities{
Username: "testuser",
CreatedOn: time.Now().UTC(),
Description: "Testing",
Visibility: "S",
}
dbConn.Create(&activity)
// use a clean Activities struct for update purpose
act := Activities{}
// Get the last record
dbConn.Last(&act)
fmt.Println("Before update: ", act)
fmt.Println("Created on : ", act.CreatedOn)
currentId := act.Id
fmt.Println("Current ID : ", currentId)
// update the last activity struct
act.Username = "test test test"
act.Description = "This is a test test test description"
act.Visibility = "A"
//dbConn.Save(&act) // update current id
// best practice is to include the id for the update statement
dbConn.Where("id = ?", currentId).Save(&act)
// Get the last record - again
dbConn.Last(&act)
fmt.Println("After update : ", act)
}
Sample output :
Before update: {27570 testuser 2015-07-29 03:29:44 +0000 UTC Testing S}
Created on : 2015-07-29 03:29:44 +0000 UTC
Current ID : 27570
After update : {27570 test test test 2015-07-29 03:29:44 +0000 UTC This is a test test test description A}
References :
https://github.com/jinzhu/gorm
https://www.socketloop.com/tutorials/golang-gorm-read-from-database-example
See also : Golang : GORM read from database example
By Adam Ng
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