mysqli_stmt::store_result

mysqli_stmt_store_result

(PHP 5, PHP 7, PHP 8)

mysqli_stmt::store_result -- mysqli_stmt_store_resultStores a result set in an internal buffer

说明

面向对象风格

public mysqli_stmt::store_result(): bool

过程化风格

mysqli_stmt_store_result(mysqli_stmt $statement): bool

This function should be called for queries that successfully produce a result set (e.g. SELECT, SHOW, DESCRIBE, EXPLAIN) only if the complete result set needs to be buffered in PHP. Each subsequent mysqli_stmt_fetch() call will return buffered data.

注意:

It is unnecessary to call mysqli_stmt_store_result() for other queries, but if you do, it will not harm or cause any notable performance loss in all cases. You can detect whether the query produced a result set by checking if mysqli_stmt_result_metadata() returns false.

参数

statement

仅以过程化样式:由 mysqli_stmt_init() 返回的 mysqli_stmt 对象。

返回值

成功时返回 true, 或者在失败时返回 false

范例

示例 #1 面向对象风格

<?php

mysqli_report
(MYSQLI_REPORT_ERROR MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost""my_user""my_password""world");

$query "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20";
$stmt $mysqli->prepare($query);
$stmt->execute();

/* store the result in an internal buffer */
$stmt->store_result();

printf("Number of rows: %d.\n"$stmt->num_rows);

示例 #2 过程化风格

<?php

mysqli_report
(MYSQLI_REPORT_ERROR MYSQLI_REPORT_STRICT);
$link mysqli_connect("localhost""my_user""my_password""world");

$query "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20";
$stmt mysqli_prepare($link$query);
mysqli_stmt_execute($stmt);

/* store the result in an internal buffer */
mysqli_stmt_store_result($stmt);

printf("Number of rows: %d.\n"mysqli_stmt_num_rows($stmt));

以上例程会输出:

Number of rows: 20.

参见