Add mysql support

internal/database/database.go

@@ -1,9 +1,12 @@
 package database
 
 import (
+	"CatsOfMastodonBotGo/internal/config"
 	"CatsOfMastodonBotGo/internal/domain"
+	"fmt"
 	"os"
 
+	"gorm.io/driver/mysql"
 	"gorm.io/driver/sqlite"
 	"gorm.io/gorm"
 )
@@ -11,17 +14,34 @@ import (
 var Gorm *gorm.DB
 
 func Connect() (*gorm.DB, error) {
-	_, err := os.ReadDir("data")
-	if err != nil {
-		err := os.Mkdir("data", 0755)
+	var db *gorm.DB
+	var err error = nil
+
+	if config.Config.DBEngine == "sqlite" {
+		_, err = os.ReadDir("data")
+		if err != nil {
+			err = os.Mkdir("data", 0755)
+			if err != nil {
+				return nil, err
+			}
+		}
+		db, err = gorm.Open(sqlite.Open("data/caom.db"), &gorm.Config{})
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=True&loc=Local",
+			config.Config.DBUser,
+			config.Config.DBPassword,
+			config.Config.DBHost,
+			config.Config.DBPort,
+			config.Config.DBName)
+		db, err = gorm.Open(mysql.Open(dsn), &gorm.Config{})
 		if err != nil {
 			return nil, err
 		}
 	}
-	db, err := gorm.Open(sqlite.Open("data/caom.db"), &gorm.Config{})
-	if err != nil {
-		return nil, err
-	}
+
 	// Migrate the schema
 	if err := db.AutoMigrate(&domain.Post{}, &domain.MediaAttachment{}, &domain.Account{}); err != nil {
 		return nil, err