當使用 PDO 將值數組綁定到 MySQL IN語句時,預設行為是將綁定值視為單一字串,包含數組中的所有元素而不是所需的單一元素
有多種方法可以解決此問題:
1.直接字串構造:
* 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 函數:
* 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.使用者定義函數:
* 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.
建議經常依賴IN 子句的查詢使用最後一種方法,因為它提供了通用的解決方案。
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