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autoMigrate.go
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autoMigrate.go
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// autoMigrate.go needs to be executed only when it is required
package main
import (
"fmt"
"gorm.io/gorm"
"github.com/pilinux/gorest/config"
"github.com/pilinux/gorest/database"
"github.com/pilinux/gorest/database/model"
)
// Load all the models
type auth model.Auth
type user model.User
type post model.Post
type hobby model.Hobby
type userHobby model.UserHobby
var db *gorm.DB
var errorState int
func main() {
configureDB := config.Config()
driver := configureDB.Database.DbDriver
/*
** 0 = default/no error
** 1 = error
**/
errorState = 0
db = database.InitDB()
// Auto migration
/*
- Automatically migrate schema
- Only create tables with missing columns and missing indexes
- Will not change/delete any existing columns and their types
*/
// Careful! It will drop all the tables!
dropAllTables()
// Automatically migrate all the tables
migrateTables()
// Manually set foreign keys for MySQL and PostgreSQL
if driver != "sqlite3" {
setPkFk()
}
if errorState == 0 {
fmt.Println("Auto migration is completed!")
} else {
fmt.Println("Auto migration failed!")
}
}
func dropAllTables() {
// Careful! It will drop all the tables!
if err := db.Migrator().DropTable(&userHobby{}, &hobby{}, &post{}, &user{}, &auth{}); err != nil {
errorState = 1
fmt.Println(err)
} else {
fmt.Println("Old tables are deleted!")
}
}
func migrateTables() {
configureDB := config.Config()
driver := configureDB.Database.DbDriver
if driver == "mysql" {
// db.Set() --> add table suffix during auto migration
if err := db.Set("gorm:table_options", "ENGINE=InnoDB").AutoMigrate(&auth{},
&user{}, &post{}, &hobby{}); err != nil {
errorState = 1
fmt.Println(err)
} else {
fmt.Println("New tables are migrated successfully!")
}
} else {
if err := db.AutoMigrate(&auth{},
&user{}, &post{}, &hobby{}); err != nil {
errorState = 1
fmt.Println(err)
} else {
fmt.Println("New tables are migrated successfully!")
}
}
}
func setPkFk() {
// Manually set foreign key for MySQL and PostgreSQL
if err := db.Migrator().CreateConstraint(&auth{}, "Users"); err != nil {
errorState = 1
fmt.Println(err)
}
if err := db.Migrator().CreateConstraint(&user{}, "Posts"); err != nil {
errorState = 1
fmt.Println(err)
}
}