[英]Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: fetch mode requires the classname argument in
When I use FETCH_CLASS
the following error come but when I use FETCH_OBJ
the page loads correctly. 当我使用FETCH_CLASS
,会出现以下错误,但是当我使用FETCH_OBJ
,页面将正确加载。 Please help me to solve this. 请帮我解决这个问题。
The error is: 错误是:
Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: fetch mode requires the classname argument in C:\\xampp\\htdocs\\Work\\AppDarbNajah\\App\\Database.php:51 Stack trace: #0 C:\\xampp\\htdocs\\Work\\AppDarbNajah\\App\\Database.php(51): PDOStatement->setFetchMode(8) #1 C:\\xampp\\htdocs\\Work\\AppDarbNajah\\App\\Model\\Model.php(62): App\\Database->query('SELECT\\r\\n ...', false, 'App\\Entity\\Arti...') #2 C:\\xampp\\htdocs\\Work\\AppDarbNajah\\App\\Model\\ArticleModel.php(9): App\\Model\\Model->query('SELECT\\r\\n ...') #3 C:\\xampp\\htdocs\\Work\\AppDarbNajah\\App\\Controller\\ArticleController.php(16): App\\Model\\ArticleModel->load() #4 C:\\xampp\\htdocs\\Work\\AppDarbNajah\\Public\\index.php(33): App\\Controller\\ArticleController->index() #5 {main} thrown in C:\\xampp\\htdocs\\Work\\AppDarbNajah\\App\\Database.php on line 51 致命错误:未捕获的PDOException:SQLSTATE [HY000]:常规错误:访存模式需要C:\\ xampp \\ htdocs \\ Work \\ AppDarbNajah \\ App \\ Database.php:51堆栈中的类名参数:#0 C:\\ xampp \\ htdocs \\ Work \\ AppDarbNajah \\ App \\ Database.php(51):PDOStatement-> setFetchMode(8)#1 C:\\ xampp \\ htdocs \\ Work \\ AppDarbNajah \\ App \\ Model \\ Model.php(62):App \\ Database-> query('SELECT \\ r \\ n ...',false,'App \\ Entity \\ Arti ...')#2 C:\\ xampp \\ htdocs \\ Work \\ AppDarbNajah \\ App \\ Model \\ ArticleModel.php(9): App \\ Model \\ Model-> query('SELECT \\ r \\ n ...')#3 C:\\ xampp \\ htdocs \\ Work \\ AppDarbNajah \\ App \\ Controller \\ ArticleController.php(16):App \\ Model \\ ArticleModel- > load()#4 C:\\ xampp \\ htdocs \\ Work \\ AppDarbNajah \\ Public \\ index.php(33):App \\ Controller \\ ArticleController-> index()#5 {main}放在C:\\ xampp \\ htdocs \\第51行的Work \\ AppDarbNajah \\ App \\ Database.php
1- code of Database: 1-数据库代码:
<?php
namespace App;
use \PDO;
/* Connect to a MySQL database using driver invocation */
class Database{
private $db_host;
private $db_name;
private $db_user;
private $db_pass;
private $pdo;
public function __construct($db_name,
$db_host = 'localhost',
$db_user = 'root',
$db_pass = ''){
$this->db_name = $db_name;
$this->db_host = $db_host;
$this->db_user = $db_user;
$this->db_pass = $db_pass;
}
private function getPDO() {
if($this->pdo === null){
$pdo = new PDO(
'mysql:host='.$this->db_host.';dbname='.$this->db_name,
$this->db_user,
$this->db_pass
);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$pdo->query('
SET NAMES utf8;
SET CHARACTER SET UTF8
');
$this->pdo = $pdo;
}
return $this->pdo;
}
public function query($statement, $one = false, $class = null){
$rs = $this->getPDO()->query($statement);
if(
strpos(strtolower($statement), 'insert') === 0 ||
strpos(strtolower($statement), 'delete') === 0 ||
strpos(strtolower($statement), 'update') === 0
){
return $rs;
}
if($class === null){
$rs->setFetchMode(PDO::FETCH_OBJ);
} else {
$rs->setFetchMode(PDO::FETCH_CLASS);
}
if($one){
$data = $rs->fetch();
} else {
$data = $rs->fetchAll();
}
return $data;
}
public function prepare($statement, $attributes, $one = false, $class = null){
$rs = $this->getPDO()->prepare($statement);
$rst = $rs->execute($attributes);
if(
strpos(strtolower($statement), 'insert') === 0 ||
strpos(strtolower($statement), 'delete') === 0 ||
strpos(strtolower($statement), 'update') === 0
){
return $rst;
}
if($class === null){
$rs->setFetchMode(PDO::FETCH_OBJ);
} else {
$rs->setFetchMode(PDO::FETCH_CLASS);
}
if($one){
$data = $rs->fetch();
} else {
$data = $rs->fetchAll();
}
return $data;
}
}
2- code of model: 2-型号代码:
<?php
namespace App\Model;
use App\Database;
class Model{
protected $db;
protected $table;
public function __construct(Database $db){
$this->db = $db;
//var_dump(get_class($this));
}
public function create($fields){
var_dump($fields);
$sql_pairs = [];
$attributes = [];
foreach ($fields as $k =>$v){
$sql_pairs[] = "$k = ?";/*راجع درس PDO*/
$attributes[] = $v;
}
$sql_parts = implode(', ', $sql_pairs);
$this->query("INSERT INTO {$this->table} SET $sql_parts", $attributes);
}
public function update($id, $fields){
}
public function delete($id){
}
public function search($id, $fields = null){
}
public function query($statement, $attributes= null, $one = false){
var_dump(get_class($this));
var_dump(str_replace('Model', 'Entity', get_class($this)));
//die();
if($attributes){
return $this->db->prepare(
$statement,
$attributes,
$one,
str_replace('Model', 'Entity', get_class($this))
);
} else{
return $this->db->query(
$statement,
$one,
str_replace('Model', 'Entity', get_class($this))
);
}
}
}
It's exactly what the error says: 错误确切地说:
fetch mode requires the classname argument 提取模式需要classname参数
You have: 你有:
$rs->setFetchMode(PDO::FETCH_CLASS);
And the possible cases, as stated in the manual , are: 如手册中所述,可能的情况是:
public bool PDOStatement::setFetchMode ( int $mode )
public bool PDOStatement::setFetchMode ( int $PDO::FETCH_COLUMN , int $colno )
public bool PDOStatement::setFetchMode ( int $PDO::FETCH_CLASS , string $classname , array $ctorargs )
public bool PDOStatement::setFetchMode ( int $PDO::FETCH_INTO , object $object )
If you want to pass PDO::FETCH_CLASS
as first argument you absolutely need to pass the two other arguments. 如果要传递PDO::FETCH_CLASS
作为第一个参数,则绝对需要传递其他两个参数。 Otherwise, how is PDO going to know which class instance it needs to create? 否则,PDO如何知道需要创建哪个类实例?
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