今天我來系統地學習一下PDO_PHP吧

1樓巨大八爪鱼 2015-5-30 19:22

操作系統：Fedora 21
PHP版本：最新的5.6.9
開發工具：gedit

2樓巨大八爪鱼 2015-5-30 19:23

本帖負責收集筆記。

3樓巨大八爪鱼 2015-5-30 19:25

<?php
include_once("conn.php");
?>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>PDO Learning</title>
</head>

<body>
<?php

?>
</body>
</html>

最基本的HTML5頁面代碼，好難記。。。

4樓巨大八爪鱼 2015-5-30 19:26

回復：3樓
不過也比HTML4好記多了。
HTML4一上來就是：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

5樓巨大八爪鱼 2015-5-30 19:28

首先，連接數據庫。
$db = new PDO("mysql:host=localhost;dbname=test", "php", "it");
密碼先填寫一個錯誤的，提示：
Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [1045] Access denied for user 'php'@'localhost' (using password: YES)' in /var/www/html/temp/11330/conn.php:4 Stack trace: #0 /var/www/html/temp/11330/conn.php(4): PDO->__construct('mysql:host=loca...', 'php', 'it') #1 /var/www/html/temp/11330/index.php(2): include_once('/var/www/html/t...') #2 {main} thrown in /var/www/html/temp/11330/conn.php on line 4
所以必須要加try-catch塊來處理這個錯誤

6樓巨大八爪鱼 2015-5-30 19:29

文檔：http://php.net/manual/en/pdo.connections.php

7樓巨大八爪鱼 2015-5-30 19:32

function display_exception($msg) {
echo $msg;
}
set_exception_handler("display_exception");
$db = new PDO("mysql:host=localhost;dbname=test", "php", "it");

exception 'PDOException' with message 'SQLSTATE[HY000] [1045] Access denied for user 'php'@'localhost' (using password: YES)' in /var/www/html/temp/11330/conn.php:8 Stack trace: #0 /var/www/html/temp/11330/conn.php(8): PDO->__construct('mysql:host=loca...', 'php', 'it') #1 /var/www/html/temp/11330/index.php(2): include_once('/var/www/html/t...') #2 {main}

8樓巨大八爪鱼 2015-5-30 19:33

try {
$db = new PDO("mysql:host=localhost;dbname=test", "php", "it");
} catch (PDOException $e) {
echo $e->getMessage();
}

SQLSTATE[HY000] [1045] Access denied for user 'php'@'localhost' (using password: YES)

9樓巨大八爪鱼 2015-5-30 19:39

try {
$db = new PDO("mysql:host=localhost;dbname=test", "php", "it");
} catch (PDOException $e) {
trigger_error("Failed connecting to the database server.", E_USER_ERROR);
}

Fatal error: Failed connecting to the database server. in /var/www/html/temp/11330/conn.php on line 7

10樓 張樹人 2015-5-30 19:39

回復：3樓
標準的寫法是「<!DOCTYPE html>」
「DOCTYPE」是大寫

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