parameterbinding

问题 I've heard that using bind variables is (can be) more efficient, because for subsequent calls with a different bind value, the query itself is still the same, so it doesn't need to be parsed anymore. I understand why this is the case for fixed values. In the cursor below, the value is fixed on 1. If I have a different cursor that is the same, except the 1 becomes 2, it is a diffent query. Clear so far. declare cursor C_CURSOR is select * from TESTTABLE pt where pt.ID = 1; But I wondered if

问题 I'm trying to bind the same value to some parameter in a raw query (Laravel 5.2) //this is a non practical example ,only for clarify the question DB::table('users as u') ->select('id') ->whereRaw('u.id > ? or u.id < ? or u.id = ?',[2,2,2]) ->first(); is there any way to bind the same parameters at once(prevent duplicating values in [2,2,2])? 回答1: Use named parameters. They're covered in the documentation in the Running Raw SQL Queries section of the Database page, under the subheading Using