[add] initial commit

app/application/database.go

@@ -0,0 +1,52 @@
+package application
+
+import (
+	"errors"
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+type DatabaseType uint8
+
+const (
+	SQL DatabaseType = iota
+	SQLite3
+)
+
+type Database struct {
+	databaseType DatabaseType
+	path         string
+	db           *gorm.DB
+	mode         Mode
+}
+
+func (d *Database) open() error {
+	var err error
+	switch d.databaseType {
+	case SQL:
+		err = errors.New("not yet implemented")
+	case SQLite3:
+		var config gorm.Config
+		if d.mode == Debug {
+			config = gorm.Config{}
+		} else {
+			config = gorm.Config{Logger: logger.Default.LogMode(logger.Silent)}
+		}
+		db, err := gorm.Open(sqlite.Open(d.path), &config)
+		if err == nil {
+			d.db = db
+		}
+	default:
+		err = errors.New("unknown database type")
+	}
+	return err
+}
+
+func (d *Database) close() error {
+	db, err := d.db.DB()
+	if err == nil {
+		err = db.Close()
+	}
+	return err
+}