refactor: reorganize packages into a domain-based layered structure

internal/db/db.go

@@ -0,0 +1,34 @@
+package db
+
+import (
+	"feedsystem_video_go/internal/account"
+	"feedsystem_video_go/internal/config"
+	"fmt"
+
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+)
+
+func NewDB(dbcfg config.DatabaseConfig) (*gorm.DB, error) {
+	dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=True&loc=Local",
+		dbcfg.User, dbcfg.Password, dbcfg.Host, dbcfg.Port, dbcfg.DBName)
+
+	db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
+	if err != nil {
+		return nil, err
+	}
+
+	return db, nil
+}
+
+func AutoMigrate(db *gorm.DB) error {
+	return db.AutoMigrate(&account.User{})
+}
+
+func CloseDB(db *gorm.DB) error {
+	sqlDB, err := db.DB()
+	if err != nil {
+		return err
+	}
+	return sqlDB.Close()
+}