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($err);
结果如下：
00000Array
(
)
Array
(
[0] => 00000
[1] => 1064
[2] => You have an error in your sql Syntax; check the manual that corresponds to your MariaDB server version for the right Syntax to use near 'a bad sql where a - b from c' at line 1
)
但是,我只是做了一个新测试,通过删除$sth-> fetchAll()或在此行之前获取错误,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
)
OK-解决方案是：
get the error code immediately after
execute()and before any fetch
最佳答案
我使用PHP 7.1.23测试了以下代码：
$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,除非禁用了仿真的prepare：
$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES,false);
输出：
error on prepare()
Array
(
[0] => 42000
[1] => 1064
[2] => You have an error in your sql Syntax; check the manual that corresponds to your MysqL server version for the right Syntax to use near 'a bad sql where a - b from c' at line 1
)
Fatal error: Uncaught Error: Call to a member function execute() on boolean
故事的道德启示：
>使用模拟的准备好的语句时,prepare()是空操作,并且错误会延迟到execute()为止.我建议禁用模拟的prepare,除非您使用的数据库不支持prepared语句(我不知道任何RDBMS产品的任何当前版本都不能执行真正的prepared语句).
>在prepare()上检查错误时,请使用$pdo-> errorInfo().
>在execute()上检查错误时,请使用$stmt-> errorInfo().