Function DeleteNodes

dialect/sql/sqlgraph/graph.go:886–906

DeleteNodes applies the DeleteSpec on the graph.

(ctx context.Context, drv dialect.Driver, spec *DeleteSpec)

// DeleteNodes applies the DeleteSpec on the graph.
func DeleteNodes(ctx context.Context, drv dialect.Driver, spec *DeleteSpec) (int, error) {
	var (
		res     sql.Result
		builder = sql.Dialect(drv.Dialect())
	)
	selector := builder.Select().
		From(builder.Table(spec.Node.Table).Schema(spec.Node.Schema)).
		WithContext(ctx)
	if pred := spec.Predicate; pred != nil {
		pred(selector)
	}
	query, args := builder.Delete(spec.Node.Table).Schema(spec.Node.Schema).FromSelect(selector).Query()
	if err := drv.Exec(ctx, query, args, &res); err != nil {
		return 0, err
	}
	affected, err := res.RowsAffected()
	if err != nil {
		return 0, err
	}
	return int(affected), nil
}

// QuerySpec holds the information for querying
// nodes in the graph.