mysqli_stmt::result_metadata

mysqli_stmt_result_metadata

(PHP 5, PHP 7, PHP 8)

mysqli_stmt::result_metadata -- mysqli_stmt_result_metadata — Returns result set metadata from a prepared statement

说明

面向对象风格

public mysqli_stmt::result_metadata(): mysqli_result|false

过程化风格

mysqli_stmt_result_metadata(mysqli_stmt $statement): mysqli_result|false

If a statement passed to mysqli_prepare() is one that produces a result set, mysqli_stmt_result_metadata() returns the result object that can be used to process the meta information such as total number of fields and individual field information.

注意:
This result set pointer can be passed as an argument to any of the field-based functions that process result set metadata, such as:
mysqli_num_fields()

mysqli_fetch_field()

mysqli_fetch_field_direct()

mysqli_fetch_fields()

mysqli_field_count()

mysqli_field_seek()

mysqli_field_tell()

mysqli_free_result()

The result set structure should be freed when you are done with it, which you can do by passing it to mysqli_free_result()

注意:
The result set returned by mysqli_stmt_result_metadata() contains only metadata. It does not contain any row results. The rows are obtained by using the statement handle with mysqli_stmt_fetch().

参数

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

返回值

Returns a result object or false if an error occurred.

范例

示例 #1 面向对象风格


<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");

$mysqli->query("DROP TABLE IF EXISTS friends");
$mysqli->query("CREATE TABLE friends (id int, name varchar(20))");

$mysqli->query("INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");

$stmt = $mysqli->prepare("SELECT id, name FROM friends");
$stmt->execute();

/* get resultset for metadata */
$result = $stmt->result_metadata();

/* retrieve field information from metadata result set */
$field = $result->fetch_field();

printf("Fieldname: %s\n", $field->name);

/* close resultset */
$result->close();

/* close connection */
$mysqli->close();
?>

示例 #2 过程化风格


<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");

mysqli_query($link, "DROP TABLE IF EXISTS friends");
mysqli_query($link, "CREATE TABLE friends (id int, name varchar(20))");

mysqli_query($link, "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");

$stmt = mysqli_prepare($link, "SELECT id, name FROM friends");
mysqli_stmt_execute($stmt);

/* get resultset for metadata */
$result = mysqli_stmt_result_metadata($stmt);

/* retrieve field information from metadata result set */
$field = mysqli_fetch_field($result);

printf("Fieldname: %s\n", $field->name);

/* close resultset */
mysqli_free_result($result);

/* close connection */
mysqli_close($link);
?>

参见

mysqli_prepare() - 准备执行一个 SQL 语句
mysqli_free_result() - Frees the memory associated with a result

add a note

User Contributed Notes 1 note

down

potherca at gmail dot com ¶

12 years ago


If result_metadata() returns false but error/errno/sqlstate tells you no error occurred, this means your query is one that does not produce a result set, i.e. an INSERT/UPDATE/DELETE query instead of a SELECT query.

This is stated in the documentation where it says "If a statement passed to mysqli_prepare() is one that produces a result set, mysqli_stmt_result_metadata() returns the result object", but it might not be clear to everyone what this entails exactly. 

Hope this helps.

add a note

官方地址：https://www.php.net/manual/en/mysqli-stmt.result-metadata.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 科技开发编程 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL C/C++ 面试数据库 Golang Git 算法正则表达式操作系统 Redis 互联网 MySql JavaScript 运维软件架构设计 Mac OS 国际 TCP/IP Excel Vim Windows Socket Oracle VR MongoDB 运营 Python MemCache 商业硬件电子设计 nginx 娱乐摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 [PHP] inet_pton/inet_ntop IP地址转换函数 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 PHPMailer设置utf8 PHPMailer字符集CharSet 如何在Composer中为GitLab实例设置访问令牌 array_multisort() 多字段排序 laravel框架查看sql语句方式 [原创]诡异的php-fpm超时问题利用php soap实现web service PHP获取指定函数定义在哪个文件中及行号 php设置cookie为httponly防止xss攻击 PHP-FPM进程数的设定 PHP5 扩展SOAP 调用 webservice PHP - mysql_real_escape_string()与mysql_escape_string() 的区别利用PHP SOAP实现WEB SERVICE PHP7添加redis扩展纯php实现DES以及TripleDES加密算法 PHPstorm 里面Terminal 不能使用 esc键吗退出编辑模式吗 Packagist / Composer 中国全量镜像

略微加速

PHP官方手册 - 互联网笔记

mysqli_stmt::result_metadata

mysqli_stmt_result_metadata

说明

参数

返回值

范例

参见

User Contributed Notes 1 note