main.go

package main

import (
   "context"
   "golang-clean-architecture-ent-gqlgen/config"
   "golang-clean-architecture-ent-gqlgen/ent"
   "golang-clean-architecture-ent-gqlgen/ent/migrate"
   "log"

   "entgo.io/ent/dialect"
   "github.com/go-sql-driver/mysql"
)

func main() {
   config.ReadConfig(config.ReadConfigOption{})

   client, err := newClient()
   if err != nil {
      log.Fatalf("failed opening mysql client: %v", err)
   }
   defer client.Close()
   createDBSchema(client)
}

func createDBSchema(client *ent.Client) {
   if err := client.Schema.Create(
      context.Background(),
      migrate.WithDropIndex(true),
      migrate.WithDropColumn(true),
   ); err != nil {
      log.Fatalf("failed creating schema resources: %v", err)
   }
}

func newDSN() string {
   mc := mysql.Config{
      User:                 config.C.Database.User,
      Passwd:               config.C.Database.Password,
      Net:                  config.C.Database.Net,
      Addr:                 config.C.Database.Addr,
      DBName:               config.C.Database.DBName,
      AllowNativePasswords: config.C.Database.AllowNativePasswords,
      Params: map[string]string{
         "parseTime": config.C.Database.Params.ParseTime,
         "charset":   config.C.Database.Params.Charset,
         "loc":       config.C.Database.Params.Loc,
      },
   }

   return mc.FormatDSN()
}

func newClient() (*ent.Client, error) {
   var entOptions []ent.Option
   entOptions = append(entOptions, ent.Debug())

   d := newDSN()

   return ent.Open(dialect.MySQL, d, entOptions...)
}