假设我有一个搜索表单,并且我想按名称或电子邮件进行搜索,我只能设法按一个值进行搜索,否则,我将收到一个SQL错误。
我浏览了该网站,但没有找到解决我问题的方法。
此代码有效:
if (isset($_POST['search'])) {
$search = $_POST['search'];
$sql = "SELECT * FROM `users` WHERE `name` LIKE ?";
$stmt = $pdo->prepare($sql);
$stmt->execute(array($search));
当我这样尝试时结束,但没有:
if (isset($_POST['search'])) {
$search = $_POST['search'];
$sql = "SELECT * FROM `users` WHERE `name` LIKE ? OR `email` LIKE ?";
$stmt = $pdo->prepare($sql);
$stmt->execute(array($search));
如何通过姓名或电子邮件进行搜索?
编辑: 这是错误:
未捕获的PDOException:SQLSTATE [HY093]:无效的参数号
EDIT2:
这是可行的解决方案:
$search = $_POST['search'];
if (isset($search)) {
$sql = "SELECT * FROM `users` WHERE `name` LIKE ? OR `email` LIKE
?";
$stmt = $pdo->prepare($sql);
$stmt->execute(["%$search%", "%$search%"]);
}
答案 0 :(得分:1)
我认为问题在于$search
变量仅包含一个元素。试试这个:
$search = $_POST['search'];
if (isset($search)) {
$sql = "SELECT * FROM `users` WHERE `name` LIKE ? OR `email` LIKE ?";
$stmt = $pdo->prepare($sql);
$stmt->execute([$search, $search]);
}
另一种解决方案是将PDO::ATTR_EMULATE_PREPARES
连接选项设置为TRUE
。这样,您可以使用多个具有相同名称的命名标记(此处为:search
),并为它们分配单个变量的值(此处为组成的字符串'%' . $search . '%'
)。>
请注意:当使用百分之一或百分之二的字符(%
)时,查询将返回包含提供的搜索值的所有 值。而在完全省略%
个字符的情况下,查询将返回所有 exact 值,并且LIKE
可以替换为=
。由您决定使用哪种替代方法。
这是一个完整的示例:
connection.php:
<?php
/*
* This page contains the code for creating a PDO connection instance.
*/
// Db configs.
define('HOST', 'localhost');
define('PORT', 3306);
define('DATABASE', 'tests');
define('USERNAME', 'abc');
define('PASSWORD', 'def');
define('CHARSET', 'utf8');
// Error reporting.
error_reporting(E_ALL);
ini_set('display_errors', 1); /* SET IT TO 0 ON A LIVE SERVER! */
// Create a PDO instance as db connection to db.
$connection = new PDO(
sprintf('mysql:host=%s;port=%s;dbname=%s;charset=%s', HOST, PORT, DATABASE, CHARSET)
, USERNAME
, PASSWORD
, [
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_EMULATE_PREPARES => TRUE, /* This is the option of interest */
PDO::ATTR_PERSISTENT => FALSE,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
]
);
test.php:
<?php
require 'connection.php';
// Hardcoded value, for testing. Should be read from $_POST array.
$search = 'joe';
$sql = 'SELECT * FROM users WHERE name LIKE :search OR email LIKE :search';
$bindings = [
':search' => '%' . $search . '%',
];
$statement = $connection->prepare($sql);
$statement->execute($bindings);
$fetchedData = $statement->fetchAll(PDO::FETCH_ASSOC);
// Display fetched data.
if ($fetchedData) {
echo '<pre>' . print_r($fetchedData, TRUE) . '</pre>';
} else {
echo 'No data found.';
}
结果:
Array
(
[0] => Array
(
[id] => 1
[name] => j.r.
[email] => joey@example.com
)
[1] => Array
(
[id] => 3
[name] => joe
[email] => joe@example.com
)
)
表定义:
CREATE TABLE tests.users (
id BIGINT NOT NULL AUTO_INCREMENT,
name varchar(100) NULL,
email varchar(100) NULL,
CONSTRAINT users_PK PRIMARY KEY (id)
)
ENGINE=InnoDB
DEFAULT CHARSET=utf8
COLLATE=utf8_general_ci;
使用的数据:
id|name |email |
--|-------|-------------------|
1|j.r. |joey@example.com |
2|michael|michael@example.com|
3|joe |joe@example.com |
资源: