如何将mysql更改为mysqli? [英] How to change mysql to mysqli?

问题描述

基于以下我用于常规mysql的代码，如何将其转换为使用mysqli?

Based on this code below I use for regular mysql, how could I convert it to use mysqli?

就像将mysql_query($sql);更改为mysqli_query($sql);一样简单吗?

Is it as simple as changing mysql_query($sql); to mysqli_query($sql);?

<?PHP

//in my header file that is included on every page I have this
$DB["dbName"] = "emails";
$DB["host"] = "localhost";
$DB["user"] = "root";
$DB["pass"] = "";
$link = mysql_connect($DB['host'], $DB['user'], $DB['pass']) or die("<center>An Internal Error has Occured. Please report following error to the webmaster.<br><br>".mysql_error()."'</center>");
mysql_select_db($DB['dbName']);
// end header connection part

// function from a functions file that I run a mysql query through in any page.
function executeQuery($sql) {
    $result = mysql_query($sql);
    if (mysql_error()) {
        $error = '<BR><center><font size="+1" face="arial" color="red">An Internal Error has Occured.<BR> The error has been recorded for review</font></center><br>';
        if ($_SESSION['auto_id'] == 1) {
            $sql_formatted = highlight_string(stripslashes($sql), true);
            $error .= '<b>The MySQL Syntax Used</b><br>' . $sql_formatted . '<br><br><b>The MySQL Error Returned</b><br>' . mysql_error();
        }
        die($error);
    }
    return $result;
}

// example query ran on anypage of the site using executeQuery function
$sql='SELECT auto_id FROM friend_reg_user WHERE auto_id=' .$info['auto_id'];
$result_member=executequery($sql);
if($line_member=mysql_fetch_array($result_member)){
    extract($line_member);
} else {
    header("location: index.php");
    exit;
}
?>

推荐答案

第一件事可能是用等效的mysqli_*替换每个mysql_*函数调用，至少在您愿意使用该过程的情况下API-考虑到您已经有一些基于MySQL API的代码(这是一种过程代码)，这将是更简单的方法.

The first thing to do would probably be to replace every mysql_* function call with its equivalent mysqli_*, at least if you are willing to use the procedural API -- which would be the easier way, considering you already have some code based on the MySQL API, which is a procedural one.

为此， MySQLi扩展功能摘要肯定会有所帮助.

To help with that, the The MySQLi Extension Function Summary is definitely something that will prove helpful.

例如:

• mysql_connect将替换为 mysqli_connect
• mysql_error将替换为 mysqli_error /or mysqli_connect_error ，具体取决于上下文
• mysql_query将替换为 mysqli_query
• 依此类推

• mysql_connect will be replaced by mysqli_connect
• mysql_error will be replaced by mysqli_error and/or mysqli_connect_error, depending on the context
• mysql_query will be replaced by mysqli_query
• and so on

注意:对于某些功能，您可能需要仔细检查参数:也许在这里和那里有一些区别-但不是很多，我要说:mysql和mysqli都是基于相同的库(libmysql;至少对于PHP< = 5.2)

Note: For some functions, you may need to check the parameters carefully: Maybe there are some differences here and there -- but not that many, I'd say: both mysql and mysqli are based on the same library (libmysql ; at least for PHP <= 5.2)

例如:

• 对于mysql，您必须使用 mysql_select_db 连接后，即可指示您要在哪个数据库上进行查询
另一方面，
• mysqli允许您将数据库名称指定为 mysqli_connect .
• 仍然，还有一个 mysqli_select_db 您可以根据需要使用的功能.

• with mysql, you have to use the mysql_select_db once connected, to indicate on which database you want to do your queries
• mysqli, on the other side, allows you to specify that database name as the fourth parameter to mysqli_connect.
• Still, there is also a mysqli_select_db function that you can use, if you prefer.

完成此操作后，尝试执行脚本的新版本...并检查是否一切正常；如果没有的话……是时候寻找bug了;-)

Once you are done with that, try to execute the new version of your script... And check if everything works ; if not... Time for bug hunting ;-)

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