chore: initial commit

internal/pkg/dberr/postgres.go

@@ -0,0 +1,49 @@
+package dberr
+
+import (
+	"errors"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
+)
+
+const (
+	SysUserAccountKey     = "sys_users_account_key"
+	SysRoleCodeKey        = "sys_roles_code_key"
+	PostSlugKey           = "posts_slug_key"
+	SysPermissionsCodeKey = "sys_permissions_code_key"
+	SysApisMethodPathKey  = "sys_apis_method_path_key"
+	CategoryCodeKey       = "categories_code_key"
+)
+
+func MapRowsAffected(rows int64, err error, notFoundErr error) error {
+	if err != nil {
+		return err
+	}
+	if rows == 0 {
+		return notFoundErr
+	}
+	return nil
+}
+
+func MapNoRows(err error, notFoundErr error) error {
+	if errors.Is(err, pgx.ErrNoRows) {
+		return notFoundErr
+	}
+	return err
+}
+
+func MapUniqueViolation(err error, constraint string, uniqueErr error) error {
+	if err == nil {
+		return nil
+	}
+
+	var pgErr *pgconn.PgError
+	if errors.As(err, &pgErr) &&
+		pgErr.Code == "23505" &&
+		pgErr.ConstraintName == constraint {
+		return uniqueErr
+	}
+
+	return err
+}