/
database.go
67 lines (63 loc) · 1.87 KB
/
database.go
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package gormx
import (
"fmt"
"gorm.io/gorm"
)
func CreateDatabase(db *gorm.DB, dbname string) error {
switch db.Dialector.Name() {
case "mysql":
if err := db.Exec("CREATE DATABASE IF NOT EXISTS " + dbname + " DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci").Error; err != nil {
return fmt.Errorf("create database failed: %v", err)
}
return nil
case "postgres":
has, err := HasDatabase(db, dbname)
if err != nil {
return err
}
if has {
return nil
}
if err := db.Exec("CREATE DATABASE " + dbname).Error; err != nil {
return fmt.Errorf("create database failed: %v", err)
}
return nil
default:
return fmt.Errorf("unsupported database %s", db.Dialector.Name())
}
}
func DropDatabase(db *gorm.DB, dbname string) error {
switch db.Dialector.Name() {
case "mysql":
if err := db.Exec("DROP DATABASE IF EXISTS " + dbname).Error; err != nil {
return fmt.Errorf("drop database failed: %v", err)
}
return nil
case "postgres":
if err := db.Exec("DROP DATABASE IF EXISTS " + dbname + " WITH (FORCE)").Error; err != nil {
return fmt.Errorf("drop database failed: %v", err)
}
return nil
default:
return fmt.Errorf("unsupported database %s", db.Dialector.Name())
}
}
func HasDatabase(db *gorm.DB, dbname string) (bool, error) {
var count int64
switch db.Dialector.Name() {
case "mysql":
if err := db.Raw("SELECT COUNT(*) FROM information_schema.schemata WHERE schema_name = ?", dbname).
Scan(&count).Error; err != nil {
return false, fmt.Errorf("check database exist failed: %v", err)
}
return count > 0, nil
case "postgres":
if err := db.Raw("SELECT COUNT(*) FROM pg_database WHERE datname = ?", dbname).
Scan(&count).Error; err != nil {
return false, fmt.Errorf("check database exist failed: %v", err)
}
return count > 0, nil
default:
return false, fmt.Errorf("unsupported database %s", db.Dialector.Name())
}
}