如何在MySQL查询中使用foreach循环

Question

I want to add some condition to my sql select by using foreach loop. For example:

select id, custom_id, name, customer from db_clients where id = 5

By using foreach I want to and more "where" condition.

select id, custom_id, name, customer from db_clients where id = 5 and id = 19

My PHP code:

$this ='select id, custom_id, name, customer from db_clients where id = 5' . foreach($ids AS $id){
'. and id = '.$id}';

Where is the problem ?

Answer 1

$this ='select id, custom_id, name, customer from db_clients where id in ('.implode(',',$ids).') ';

这确实假定$ ids始终至少具有一个数组值，它可以为空，您需要在执行此操作之前添加另一条检查，或者添加-1或某些在数组中将永远不存在的id才可以确保填充它永远不会空虚，有很多方法可以处理空虚情况。