当使用 PDO 将值数组绑定到 MySQL IN 语句时,默认行为是将绑定值视为单个字符串,包含数组中的所有元素而不是所需的单个元素
有多种方法可以解决此问题:
1.直接字符串构造:
* Construct the IN clause within the query string, directly including the values instead of binding them. This method avoids the binding issue but requires hard-coding the values in the query.
2. find_in_set 函数:
* Utilize the find_in_set function to search for values in a comma-separated string. Modify the query as follows: ``` SELECT users.id FROM users JOIN products ON products.user_id = users.id WHERE find_in_set(cast(products.id as char), :products) ``` Note that this approach may impact performance for large datasets.
3.用户定义函数:
* Create a user-defined function that splits the comma-separated values. This function can be used in the IN clause to convert the string to individual values.
建议经常依赖 IN 子句的查询使用最后一种方法,因为它提供了通用的解决方案。
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