如何在PHP中通过PDO遍历MySQL查询? [英] How do I loop through a MySQL query via PDO in PHP?

问题描述

我正在将所有LAMP websites从mysql_函数移到PDO函数，并且碰到了我的第一个砖墙.我不知道如何通过参数遍历结果.我可以满足以下条件:

I'm slowly moving all of my LAMP websites from mysql_ functions to PDO functions and I've hit my first brick wall. I don't know how to loop through results with a parameter. I am fine with the following:

foreach ($database->query("SELECT * FROM widgets") as $results)
{
   echo $results["widget_name"];
}

但是，如果我想做这样的事情:

However if I want to do something like this:

foreach ($database->query("SELECT * FROM widgets WHERE something='something else'") as $results)
{
   echo $results["widget_name"];
}

显然，其他"是动态的.

Obviously the 'something else' will be dynamic.

推荐答案

以下是使用PDO连接到数据库，告诉它引发Exception(而不是php错误)(将有助于调试)和使用的示例.参数化的语句，而不是自己将动态值替换为查询(强烈建议):

Here is an example for using PDO to connect to a DB, to tell it to throw Exceptions instead of php errors (will help with your debugging), and using parameterised statements instead of substituting dynamic values into the query yourself (highly recommended):

// $attrs is optional, this demonstrates using persistent connections,
// the equivalent of mysql_pconnect
$attrs = array(PDO::ATTR_PERSISTENT => true);

// connect to PDO
$pdo = new PDO("mysql:host=localhost;dbname=test", "user", "password", $attrs);

// the following tells PDO we want it to throw Exceptions for every error.
// this is far more useful than the default mode of throwing php errors
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

// prepare the statement. the place holders allow PDO to handle substituting
// the values, which also prevents SQL injection
$stmt = $pdo->prepare("SELECT * FROM product WHERE productTypeId=:productTypeId AND brand=:brand");

// bind the parameters
$stmt->bindValue(":productTypeId", 6);
$stmt->bindValue(":brand", "Slurm");

// initialise an array for the results 
$products = array();
if ($stmt->execute()) {
    while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
        $products[] = $row;
    }
}

// set PDO to null in order to close the connection
$pdo = null;

这篇关于如何在PHP中通过PDO遍历MySQL查询?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！