問(wèn)題描述

我使用 PHP PDO 連接到我的數(shù)據(jù)庫(kù)并運(yùn)行一些查詢，然后在某些表單上使用查詢返回.

I am using PHP PDO to connect to my database and run some querys to then use the query return on some forms.

也就是說(shuō)，我有一個(gè)選擇，它由來(lái)自查詢的值填充.

That is, I have a select where it is populated by the values ??coming from the query.

我創(chuàng)建了兩個(gè)函數(shù)來(lái)連接數(shù)據(jù)庫(kù)和數(shù)據(jù)，但我想知道我是否可以創(chuàng)建一個(gè)全局變量，因?yàn)槲沂褂玫氖荖ew PDO".

I created two functions to connect to the database and data, but I wanted to know if I can create a global variable because I am using the "New PDO" .

/** Conecta com as impressas **/
function impressoras()
{       
    $PDO2 = new PDO('mysql:host=localhost;dbname=ti','root','xxx');
    $PDO2->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    global $stmt;
    $stmt = $PDO2->prepare("SELECT * FROM league");
    $stmt->execute();
    $result = $stmt->fetchAll();
    return $result; 
    echo json_encode($user_arr);    
}
function carrefour()
{
    $PDO3 = new 
    PDO('mysql:host=localhost;dbname=ti','root','xxx');
    $PDO3->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    global $stmt;
    $stmt = $PDO3->prepare("SELECT * FROM lol");
    $stmt->execute();
    $result = $stmt->fetchAll();
    return $result;     
    echo json_encode($user_arr);    
}

推薦答案

您可以以簡(jiǎn)單的舊程序風(fēng)格非常簡(jiǎn)單地共享"同一個(gè)數(shù)據(jù)庫(kù)連接對(duì)象 (PDO) :-) 這是一個(gè)簡(jiǎn)單的例子:

You could "share" the same database connection object (PDO) very simple in plain old procedural style :-) Here is a simple example:

// config.php
define('DB_DSN', 'mysql:host=127.0.0.1;dbname=test;charset=utf8');
define('DB_USERNAME', 'root');
define('DB_PASSWORD', '');

// database.php
function db()
{
    static $db = null;
    if ($db === null) {
        $db = new PDO(DB_DSN, DB_USERNAME, DB_PASSWORD, array(
            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_PERSISTENT => false,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
            PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8 COLLATE utf8_unicode_ci"
        ));
    }
    return $db;
}

用法

function test1()
{       
    $pdo = db();
    $stmt = $pdo->prepare("SELECT * FROM league");
    $stmt->execute();
    $result = $stmt->fetchAll();
    return $result;     
}

如果您更喜歡更專業(yè)的解決方案，請(qǐng)查看 PHP-DI 并使用依賴注入.

If you prefer a more professional solution then take a look an PHP-DI and use dependency injection.

這篇關(guān)于PDO 全局實(shí)例 新的 PDO ，它可能嗎?的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！