mysql 自带方法 find_in_set('条件', 字段);
表数据
+----+-------+------------+
|> +----+-------+------------+
| 1 | name | 1,2,3,4,5 |
| 2 | pname | 1,2,3,44,5 |
+----+-------+------------+
select * from test where find_in_set('3', pid);
+----+------+-----------+
|> +----+------+-----------+
| 1 | name | 1,2,3,4,5 |
+----+------+-----------+
select * from test where find_in_set('44', pid) or find_in_set('5', pid);
+----+-------+------------+