Question

~~对不起，我是新手使用pdo并试图关注http://php.net/manual/en/pdo.connections.php，我完全迷失了。我知道sql语句被删除了，我想切换到pdo，我无法弄明白。~~

代码：

function getKey() { $dbh = new PDO('mysql:host=localhost;dbname=ahs', $user, $pass, array( PDO::ATTR_PERSISTENT => true

））;

$row = $dbh->query('SELECT `key` from `settings`'); return $row['key']; $dbh = null; //$query = 'SELECT * FROM `'.$table_settings.'`'; //$r_query = mysql_query($query); //$result = mysql_fetch_array($r_query); //return $result[$table_settings_key]; }

错误：

Fatal error: Cannot redeclare getKey() (previously declared in C:\xampp\htdocs\ahs\db\pdo\core.php:4) in C:\xampp\htdocs\ahs\db\pdo\core.php on line 12

我很遗憾出了什么问题。 getKey（）只在我这个1 php文件中声明。

~~我做错了什么？~~

好的，所以我在这里跟踪了一个指南http://jayblanchard.net/demystifying_php_pdo.html，并且我被困在一个新的部分大声笑。

connect.php：

error_reporting(E_ALL);
ini_set('display_errors', 1);

define('USER', '');
define('PASS', '');

function dataQuery($query, $params) {
$queryType = explode(' ', $query);

// establish database connection
try {
    $dbh = new PDO('mysql:host=localhost;dbname=ahs', USER, PASS);
    $dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
    $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(PDOException $e) {
    echo $e->getMessage();
    $errorCode = $e->getCode();
}

// run query
try {
    $queryResults = $dbh->prepare($query);
    $queryResults->execute($params);
    if($queryResults != null && 'SELECT' == $queryType[0]) {
        $results = $queryResults->fetchAll(PDO::FETCH_ASSOC);
        return $results;
    }
    $queryResults = null; // first of the two steps to properly close
    $dbh = null; // second step to close the connection
}
catch(PDOException $e) {
    $errorMsg = $e->getMessage();
    echo $errorMsg;
}
}

core.php中：

function getKey() {
$query = 'SELECT `key` FROM `settings`';
$params = array();
$results = dataQuery($query,$params);
print_r($results);
}

和输出：

Array ( [0] => Array ( [key] => aitjjdjjdnvjdvnj12235435sdfj324jj23j24nj789 ) )

如何只显示密钥的值？！？

弄清楚了lol抱歉的家伙

print_r($results[0]['key']);

将我的sql语句迁移到pdo预处理语句

0 个答案: