diff --git a/internal/db/db.go b/internal/db/db.go
index d1b7810..93da0c2 100644
--- a/internal/db/db.go
+++ b/internal/db/db.go
@@ -1,94 +1,9 @@
 package db
 
-import (
-	"context"
-	"database/sql"
-	_ "embed"
-	"time"
+import "context"
 
-	_ "github.com/go-sql-driver/mysql"
-	"golang.org/x/crypto/bcrypt"
-)
-
-//go:embed setup.sql
-var setupSql string
-
-const DB_NAME = "s3Browser"
-
-type DB struct {
-	dbConn *sql.DB
-}
-
-func NewDB(dataSourceName string) (*DB, error) {
-	db, err := sql.Open("mysql", dataSourceName)
-
-	if err != nil {
-		return nil, err
-	}
-
-	db.SetConnMaxLifetime(time.Minute * 3)
-	db.SetMaxOpenConns(10)
-	db.SetMaxIdleConns(10)
-
-	return &DB{
-		dbConn: db,
-	}, nil
-}
-
-func (d *DB) Setup() error {
-	tx, err := d.dbConn.Begin()
-	if err != nil {
-		return err
-	}
-
-	_, err = tx.Exec(setupSql)
-	if err != nil {
-		tx.Rollback()
-		return err
-	}
-
-	err = tx.Commit()
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func (d *DB) CheckLogin(ctx context.Context, username, password string) (bool, error) {
-	rows, err := d.dbConn.QueryContext(ctx, "SELECT password FROM user WHERE username = ?", username)
-	if err != nil {
-		return false, err
-	}
-
-	if !rows.Next() {
-		return false, nil
-	}
-
-	var passwordHash []byte
-	err = rows.Scan(&passwordHash)
-	if err != nil {
-		return false, err
-	}
-
-	if bcrypt.CompareHashAndPassword(passwordHash, []byte(password)) != nil {
-		return false, nil
-	}
-
-	return true, nil
-}
-
-func (d *DB) AddUser(ctx context.Context, username, password string) error {
-	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
-	if err != nil {
-		return err
-	}
-
-	_, err = d.dbConn.ExecContext(ctx, "INSERT INTO user (username,password) VALUES (?,?)", username, hash)
-
-	if err != nil {
-		return err
-	}
-
-	return nil
+type DB interface {
+	Setup() error
+	CheckLogin(ctx context.Context, username, password string) (bool, error)
+	AddUser(ctx context.Context, username, password string) error
 }
diff --git a/internal/db/mysql.go b/internal/db/mysql.go
new file mode 100644
index 0000000..2df33e2
--- /dev/null
+++ b/internal/db/mysql.go
@@ -0,0 +1,94 @@
+package db
+
+import (
+	"context"
+	"database/sql"
+	_ "embed"
+	"time"
+
+	_ "github.com/go-sql-driver/mysql"
+	"golang.org/x/crypto/bcrypt"
+)
+
+//go:embed setup.sql
+var setupSql string
+
+const DB_NAME = "s3Browser"
+
+type mysqlDB struct {
+	dbConn *sql.DB
+}
+
+func NewDB(dataSourceName string) (DB, error) {
+	db, err := sql.Open("mysql", dataSourceName)
+
+	if err != nil {
+		return nil, err
+	}
+
+	db.SetConnMaxLifetime(time.Minute * 3)
+	db.SetMaxOpenConns(10)
+	db.SetMaxIdleConns(10)
+
+	return &mysqlDB{
+		dbConn: db,
+	}, nil
+}
+
+func (d *mysqlDB) Setup() error {
+	tx, err := d.dbConn.Begin()
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.Exec(setupSql)
+	if err != nil {
+		tx.Rollback()
+		return err
+	}
+
+	err = tx.Commit()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (d *mysqlDB) CheckLogin(ctx context.Context, username, password string) (bool, error) {
+	rows, err := d.dbConn.QueryContext(ctx, "SELECT password FROM user WHERE username = ?", username)
+	if err != nil {
+		return false, err
+	}
+
+	if !rows.Next() {
+		return false, nil
+	}
+
+	var passwordHash []byte
+	err = rows.Scan(&passwordHash)
+	if err != nil {
+		return false, err
+	}
+
+	if bcrypt.CompareHashAndPassword(passwordHash, []byte(password)) != nil {
+		return false, nil
+	}
+
+	return true, nil
+}
+
+func (d *mysqlDB) AddUser(ctx context.Context, username, password string) error {
+	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return err
+	}
+
+	_, err = d.dbConn.ExecContext(ctx, "INSERT INTO user (username,password) VALUES (?,?)", username, hash)
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}