問題描述
我正在使用 PHP 函數 mysqli_query 運行 SELECT 查詢.
I am using the PHP function mysqli_query to run a SELECT query.
如果查詢運行成功，但查詢沒有找到匹配項，mysqli_query 返回什么?
What does mysqli_query return if the query runs successfully, but the query finds no matches?
推薦答案
根據 手冊:
失敗時返回 FALSE.對于成功的 SELECT、SHOW、DESCRIBE 或 EXPLAIN 查詢，mysqli_query() 將返回一個 mysqli_result 對象.對于其他成功的查詢，mysqli_query() 將返回 TRUE.
Returns FALSE on failure. For successful SELECT, SHOW, DESCRIBE or EXPLAIN queries mysqli_query() will return a mysqli_result object. For other successful queries mysqli_query() will return TRUE.
運行但不返回結果的查詢仍被視為成功查詢"，因為該查詢確實在數據庫中運行并且空結果集是合法響應.這意味著查詢仍然會返回一個 mysqli_result 對象，如果你檢查它的行數(通過面向對象風格的 $result->num_rows 或 mysqli_num_rows($result) 在程序風格中)它將返回 0.
A query that runs but returns no results is still considered a "successful query", since the query did run in the database and an empty result set is a legitimate response. This means the query will still return a mysqli_result object, and if you check its row count (either via $result->num_rows in the object-oriented style or mysqli_num_rows($result) in the procedural style) it will return 0.
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