問題描述

請放輕松，我剛開始學習 PDO 并且仍在尋找如何將我的 mysqli 轉換為 PDO 的方法.

please be easy on me, i just started learning PDO and still finding my way how to convert my mysqli to PDO.

所以我有一個函數可以從我的數據庫中獲取內容

so i have a function to get the contents from my database

function getContent() {
    $db = PDOconn();
    $query = "SELECT * FROM posts ORDER BY id DESC LIMIT 0,3";
    $sql = $db->prepare($sql);
    $row = $sql->fetchAll(PDO::FETCH_ASSOC);

    return $row;
}

通常當我在mysqli中返回$row時，我會在while循環中定義fetch_assoc().

normally when i return $row in mysqli, i would define fetch_assoc() in my while loop.

while ($row = $result->fetch_assoc())  {
    $id = $row['id'];
    $content = $row['content'];
}

現在，因為 (PDO::FETCH_ASSOC) 已經在我的函數中聲明了.

Now, since (PDO::FETCH_ASSOC) is already declared in my function.

我將如何正確創建我的 while 循環來打印 PDO 中的值?

how would i properly create my while loop to print the values in PDO?

更新代碼

我將在函數之外聲明我的 while 循環.所以我需要一些東西從我的函數中返回，但我不知道那是什么..

i will be declaring my while loop outside of the function. so i need something to return from my function but i dont know what that is..

function getContent() {
    $db = PDOconn();
    $query = "SELECT * FROM posts ORDER BY id DESC LIMIT 0,3";
    $sql = $db->prepare($query);
    $row = $sql->execute();

    return $row;
}

這是我在函數外的while循環.

this is my while loop outside the function.

$sql = getContent();

while ($row = $sql->fetchAll(PDO::FETCH_ASSOC))  {
    $id = $row['id'];
    $content = $row['content'];
}

推薦答案

使用 fetchAll() 你不必使用 while根本.由于此函數返回一個數組，您必須改用foreach():

With fetchAll() you don't have to use while at all. As this function returns an array, you have to use foreach() instead:

function getContent() {
    $db = PDOconn();
    $query = "SELECT * FROM posts ORDER BY id DESC LIMIT 0,3";
    $sql = $db->prepare($query);
    $sql->execute();
    return $sql->fetchAll();
}

$data = getContent();
foreach($data as $row) {
    $id = $row['id'];
    $content = $row['content'];
}

這篇關于如何在 PDO fetchAll 中正確使用 while 循環的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！