Php 在连接类中使用PDO时如何显示mysql错误？
我正在尝试编写一个小类，这样我就可以使用它连接到我的数据库，但我有一个问题，PDO没有显示错误 我试图做的是在查询失败时显示mysql错误，这样我就知道错误是什么并修复它 在我的调用中，我有4个方法需要捕获mysql错误Php 在连接类中使用PDO时如何显示mysql错误？,php,mysql,class,error-handling,pdo,Php,Mysql,Class,Error Handling,Pdo,我正在尝试编写一个小类，这样我就可以使用它连接到我的数据库，但我有一个问题，PDO没有显示错误 我试图做的是在查询失败时显示mysql错误，这样我就知道错误是什么并修复它 在我的调用中，我有4个方法需要捕获mysql错误 startConnection() getOneResult() processQuery() getDataSet() 这是我现在的课 有人能告诉我如何显示mysql错误吗。注意：我试图使用try-catch来捕获错误，但这对我来说不起作用 谢谢你的帮助 <?php
startConnection()
getOneResult()
processQuery()
getDataSet()
<?php
class connection {
private $connString;
private $userName;
private $passCode;
private $server;
private $pdo;
private $errorMessage;
private $pdo_opt = array (
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
);
function __construct($dbName, $serverName = 'localhost'){
//sets credentials
$this->setConnectionCredentials($dbName, $serverName);
//start the connect
$this->startConnection();
}
function startConnection(){
$this->pdo = new PDO($this->connString, $this->userName, $this->passCode, $this->pdo_opt);
if( ! $this->pdo){
$this->errorMessage = 'Failed to connect to database. Please try to refresh this page in 1 minute. ';
$this->errorMessage .= 'However, if you continue to see this message please contact your system administrator.';
echo $this->getError();
}
}
//this will close the PDO connection
public function endConnection(){
$this->pdo->close;
}
//return a dataset with the results
public function getDataSet($query, $data = NULL)
{
$cmd = $this->pdo->prepare( $query );
$cmd->execute($data);
return $cmd->fetchAll();
}
//return a dataset with the results
public function processQuery($query, $data = NULL)
{
$cmd = $this->pdo->prepare( $query );
return $cmd->execute($data);
}
public function getOneResult($query, $data = NULL){
$cmd = $this->pdo->prepare( $query );
$cmd->execute($data);
return $cmd->fetchColumn();
}
public function getError(){
if($this->errorMessage != '')
return $this->errorMessage;
else
return true; //no errors found
}
//this where you need to set new server credentials with a new case statment
function setConnectionCredentials($dbName, $serv){
switch($serv){
case 'NAME':
$this->connString = 'mysql:host='.$serv.';dbname='.$dbName.';charset=utf8';
$this->userName = 'user';
$this->passCode = 'password';
break;
default:
$this->connString = 'mysql:host=localhost;dbname=rdi_cms;charset=utf8';
$this->userName = 'user';
$this->passCode = 'pass!';
break;
}
}
}
?>
我将放弃或不使用方法
getError（）getOneResult（）processQuery（）getDataSet（）try
{
$conn = new connection( "mydatabase" );
$db = $conn->getPdoInstance();
$stmt = $db->prepare( "SELECT * FROM `something`" );
$stmt->execute();
}
catch( PDOException $e )
{
// Catch the error message and do whatever you need to do with it
}
- 在SQL错误上生成PDO theow异常
- 将PHP设置为在开发服务器上显示错误消息并在实时服务器上登录
ini_set('display_errors',1);
error_reporting(E_ALL);
好吧，我试着运行你的代码，上面这两行神奇的代码从另一方面帮助了我：
Notice: Undefined variable: pdo_opt in D:\SERVER\htdocs\0.php on line 37
$this->pdo_opt这里有一个教训，为什么
错误报告E\u ALLgetOneResult（）*叹气*