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HomeBackend DevelopmentPHP TutorialPDOStatement::setFetchMode()问题

<code>function fetch($query='', $type = 'BOTH') 
{
    $result_type="PDO::FETCH_".$type;
    $query->setFetchMode($result_type);//这报错,$query是pdo的query结果
    $result_arr=$query->fetch();
    return $result_arr;
}
</code>

PDOStatement::setFetchMode(): SQLSTATE[HY000]: General error: mode must be an integer
这个是什么问题?本地测试没问题,放空间报错

回复内容:

<code>function fetch($query='', $type = 'BOTH') 
{
    $result_type="PDO::FETCH_".$type;
    $query->setFetchMode($result_type);//这报错,$query是pdo的query结果
    $result_arr=$query->fetch();
    return $result_arr;
}
</code>

PDOStatement::setFetchMode(): SQLSTATE[HY000]: General error: mode must be an integer
这个是什么问题?本地测试没问题,放空间报错

no code, no truth.

你得把代码和数据库从你的项目中抽出来并尽量简化,以便于其它人在自己的电脑上重现你遇到的问题,再来分析。

PDO扩展在Windows环境和Linux环境的行为不相同,有的代码在Windows环境是不报错的(warning、notice全打开也不报),但在linux环境就会报错的,我7年前遇到过。


改一行代码:

<code>$query->setFetchMode(constant($result_type));
</code>

PDOStatement::setFetchMode方法必须传入第一个int型的mode参数啊,你肯定没传或者传的不是int型的。至于本地测试没报错,可能是service的错误输出级别跟空间的不一样。

<code>PDOStatement::setFetchMode ( int $mode );

//mode
//The fetch mode must be one of the PDO::FETCH_* constants.
</code>

一个更好的方法,有图有真相:

PDOStatement::setFetchMode()问题

你理解错文档的意思了,那是要你填一个PDO的常量,不是字符串。

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