feat(transaction): #66 implement transactions

db/error.go

@@ -1,10 +1,38 @@
 package db
 
 import (
+	"database/sql"
 	"errors"
+	"spend-sparrow/log"
+	"spend-sparrow/types"
 )
 
 var (
 	ErrNotFound      = errors.New("the value does not exist")
 	ErrAlreadyExists = errors.New("row already exists")
 )
+
+func TransformAndLogDbError(module string, r sql.Result, err error) error {
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return ErrNotFound
+		}
+		log.Error("%v: %v", module, err)
+		return types.ErrInternal
+	}
+
+	if r != nil {
+		rows, err := r.RowsAffected()
+		if err != nil {
+			log.Error("%v: %v", module, err)
+			return types.ErrInternal
+		}
+
+		if rows == 0 {
+			log.Info("%v: not found", module)
+			return ErrNotFound
+		}
+	}
+
+	return nil
+}