Rails中有批量更新吗？

在Java中，我们有批处理执行，如下面的java代码：

Statement statement = null; statement = connection.createStatement(); statement.addBatch("update people set firstname='John' where id=123"); statement.addBatch("update people set firstname='Eric' where id=456"); statement.addBatch("update people set firstname='May' where id=789"); int[] recordsAffected = statement.executeBatch(); 

如何在rails ActiveRecord中做同样的事情？

Answer 1

你可以尝试一下。 看起来像你在追求什么。

 # Updating multiple records: people = { 1 => { "first_name" => "David" }, 2 => { "first_name" => "Jeremy" } } Person.update(people.keys, people.values) 

引用： https ： //cbabhusal.wordpress.com/2015/01/03/updating-multiple-records-at-the-same-time-rails-activerecord/

为了满足职位要求，它转换为：

 people = { 123 => { "firstname" => "John" }, 456 => { "firstname" => "Eric" }, 789 => { "firstname" => "May" } } Person.update(people.keys, people.values) 

请注意，将上述内容转换为SQL仍会产生多个查询