Php 即使出现错误，PDO错误代码始终为00000

我正在运行PHP7.2.16

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

$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
)

然而，我刚刚做了一个新的测试，通过删除

$sth->fetchAll（）

或在这行之前获取错误，它正确地显示：

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
)

好的-解决方案是：

在

execute（）

之后和任何提取之前立即获取错误代码

---

我用PHP7.1.23测试了这段代码：

$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
)

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

然后，我测试了相同的代码，除了禁用模拟准备之后：

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

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
)

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

故事的寓意：

• 当使用模拟的prepared语句时，

  prepare（）

  是一个no-op，错误会延迟到

  execute（）

  。我建议禁用模拟prepare，除非您使用的数据库不支持prepared语句（我不知道任何当前版本的RDBMS产品都不能执行真正的prepared语句）

• 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（）

---

什么是“一个”/“另一个”？我只看到一个代码。您是否检查了

$pdo

中的错误？谢谢。出现错误是因为在fetchAll之前运行了错误检查等：）能否在errorInfo（）之前使用fetchAll重新测试？从失败的查询中获取fetchAll（）没有任何意义。您应该在prepare（）或execute（）之后立即检查错误。如果禁用模拟prepare，您甚至无法尝试fetchAll（），因为

$sth

将为false，并且您无法从中调用方法。是的。我仔细检查了SIDU，这是在提取之前检查错误。谢谢