mysqli_query-返回值 [英] mysqli_query - return values

问题描述

我正在使用PHP函数mysqli_query来运行SELECT查询.

I am using the PHP function mysqli_query to run a SELECT query.

如果查询成功运行，但没有找到匹配项，mysqli_query返回什么?

What does mysqli_query return if the query runs successfully, but the query finds no matches?

推荐答案

每个手册:

失败时返回FALSE.对于成功的SELECT，SHOW，DESCRIBE或EXPLAIN查询，mysqli_query()将返回mysqli_result对象.对于其他成功的查询，mysqli_query()将返回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.

运行但不返回任何结果的查询仍被视为成功查询"，因为该查询确实已在数据库中运行，并且空结果集是合法的响应.这意味着查询仍将返回mysqli_result对象，并且如果您检查其行计数(通过面向对象样式的$result->num_rows或过程样式的mysqli_num_rows($result))，它将返回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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