使用原生PHP来连接MySQL的方法有MySQL库、MySQLi库以及PDO,由于PHP 7已经废除MySQL库,所以建议使用MySQLi和PDO。
连接MySQLi有两种风格:
- 面向对象风格(推荐)
- 过程化风格
面向对象风格:
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<?php
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$mysqli = new mysqli('localhost', 'root', '123456', 'test_laravel');
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if ($mysqli->connect_error) {
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die('Connect Error (' . $mysqli->connect_errno . ') ' . $mysqli->connect_error);
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}
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$result = $mysqli->query('select * from articles');
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$row = $result->fetch_array(MYSQLI_ASSOC);
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print_r($row);
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// 关闭mysql连接
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$mysqli->close();
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运行:
Array
(
[id] => 1
[title] => My new title
[body] => First Body
[created_at] => 2017-05-22 11:10:20
[updated_at] => 2017-05-22 11:30:58
[published_at] => 2017-05-22 11:10:00
[excerpt] =>
)
fetch_array方法如果不带参数的话,则默认是MYSQLI_BOTH,输出是这样的:
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(
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[0] => 1
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[id] => 1
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[1] => My new title
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[title] => My new title
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[2] => First Body
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[body] => First Body
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[3] => 2017-05-22 11:10:20
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[created_at] => 2017-05-22 11:10:20
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[4] => 2017-05-22 11:30:58
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[updated_at] => 2017-05-22 11:30:58
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[5] => 2017-05-22 11:10:00
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[published_at] => 2017-05-22 11:10:00
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[6] =>
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[excerpt] =>
16
)
也可以选择MYSQLI_NUM
Array
(
[0] => 1
[1] => My new title
[2] => First Body
[3] => 2017-05-22 11:10:20
[4] => 2017-05-22 11:30:58
[5] => 2017-05-22 11:10:00
[6] =>
)
一般来说,选择MySQLI_ASSOC
面向过程化风格:
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<?php
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$mysqli = mysqli_connect('localhost', 'root', '123456', 'test_laravel');
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if (mysqli_connect_error()) {
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die('Connect Error (' . $mysqli->connect_errno . ') ' . $mysqli->connect_error);
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}
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$result = mysqli_query($mysqli, 'select * from articles');
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$row = mysqli_fetch_array($result, MYSQLI_ASSOC);
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print_r($row);
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// 关闭mysql连接
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mysqli_close($mysqli);
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运行和上面一致。
使用PDO连接mysql:
<?php
try {
$PDO = new PDO('mysql:host=localhost;dbname=test_laravel', 'root', '123456');
$result = $PDO->query('select * from articles');
$row = $result->fetch(PDO::FETCH_ASSOC);
print_r($row);
// 关闭mysqi连接
$PDO = null;
} catch (PDOException $e) {
die('Connection failed: ' . $e->getMessage());
}
PDO的fetch方法不带参数的话,默认是:PDO::FETCH_BOTH,也可以PDO::FETCH_NUM和PDO::FETCH_ASSOC等,一般来说选择PDO::FETCH_ASSOC即可。
总结:使用PDO或者是MySQLi都是可以的,但网上更推荐使用PDO来连接数据库,这是因为PDO支持12种不同的数据库驱动程序,而MySQLi只能支持MySQL,另外PDO的性能也更高。