Question

我正在运行PHP 7.2.16

不确定启动时，即使有错误，PDO errorCode（）或errorInfo（）[0]现在总是显示00000

$pdo = new \PDO('mysql:host=localhost;dbname=mydb', 'root', 'pwd');
$sth = $pdo->prepare('select now() and this is a bad SQL where a - b from c');
$sth->execute();
$row = $sth->fetchAll();
$err = $sth->errorInfo();
echo $sth->errorCode();
print_r($row);
print_r($err);

结果如下：

00000Array
(
)
Array
(
    [0] => 00000
    [1] => 1064
    [2] => You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'a bad SQL where a - b from c' at line 1
)

但是，我刚刚做了一个新测试，通过删除$sth->fetchAll()或在此行之前出现错误，可以正确显示：

Array
(
    [0] => 42000
    [1] => 1064
    [2] => You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'a bad SQL where a - b from c' at line 1
)

好-解决方案是：

在execute()之后和提取之前立即获取错误代码

Answer 1

我使用PHP 7.1.23测试了此代码：

$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
$sth = $pdo->prepare('select now() and this is a bad SQL where a - b from c');
if ($sth === false) {
  echo "error on prepare()\n";
  print_r($pdo->errorInfo());
}
if ($sth->execute() === false) {
  echo "error on execute()\n";
  print_r($sth->errorInfo());
}

输出：

error on execute()
Array
(
    [0] => 42000
    [1] => 1064
    [2] => You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'a bad SQL where a - b from c' at line 1
)

然后我测试了相同的代码，除非禁用了模拟的prepare：

$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);

输出：

error on prepare()
Array
(
    [0] => 42000
    [1] => 1064
    [2] => You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'a bad SQL where a - b from c' at line 1
)

Fatal error: Uncaught Error: Call to a member function execute() on boolean

故事的道德：

使用模拟的准备好的语句时，prepare()是空操作，错误会延迟到execute()为止。我建议禁用仿真的prepare，除非您使用的数据库不支持prepared语句（我不知道任何RDBMS产品的任何当前版本都不能执行真正的prepared语句）。
在检查prepare（）上的错误时，请使用$pdo->errorInfo()。
在execute（）上检查错误时，请使用$stmt->errorInfo()。

即使出现错误，PDO错误代码也始终为00000

1 个答案: