Golang : How to check if a connection to database is still alive ?
Problem :
How to check if a connection to database is still alive ?
Solution :
Use DB.Ping function. For example :
package main
import (
"database/sql"
"fmt"
// without the underscore _, you will get imported but not
// used error message
_ "github.com/go-sql-driver/mysql"
"os"
)
func main() {
// connect to our database server with data source name
// data source name configuration has the following parameters :
// [username[:password]@][protocol[(address)]]/dbname[?param1=value1&...¶mN=valueN]
// example config :
// user:password@tcp(127.0.0.1:3306)/database
conn, err := sql.Open("mysql", "db_username:db_password@protocol(address:port_num)/database_name")
if err != nil {
fmt.Println(err)
os.Exit(1)
}
err = conn.Ping()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// if no error. Ping is successful
fmt.Println("Ping to database successful, connection is still alive")
conn.Close()
// this part should fail
err = conn.Ping()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// if no error. Ping is successful
fmt.Println("Ping to database successful, connection is still alive")
}
Output :
Ping to database successful, connection is still alive
sql: database is closed
exit status 1
References :
See also : Golang : Connect to database (MySQL/MariaDB) server
By Adam Ng
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