mysqli迁移

Question

在用参考书搭建了一个网站几周后，现在发现mysql是多余的，我需要把所有东西都改成mysqli，但我得到了严重矛盾的结果，尽管这需要几分钟的时间。

谁能告诉我，我现有的代码出了什么问题--至少可以说是最小的代码--很难转换成mysql，因为每次我尝试一个新的解决方案，我都会得到一个完全空白的页面。

顺便说一句，目前一切都运行得很好。

这是我连接到的配置页面：

<?php
# FileName="Connection_php_mysqli.htm"
# Type="MYSQL"
# HTTP="true"
$hostname_em = "localhost";
$database_em = "php_test";
$username_em = "username";
$password_em = "password";
$em = mysql_pconnect($hostname_em, $username_em, $password_em) or trigger_error(mysql_error(),E_USER_ERROR); 
?>

这是我的标题：

<?php require_once('connections/em.php'); ?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
if (PHP_VERSION < 6) {
$theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
}

$theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);

switch ($theType) {
case "text":
  $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
  break;    
case "long":
case "int":
  $theValue = ($theValue != "") ? intval($theValue) : "NULL";
  break;
case "double":
  $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
  break;
case "date":
  $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
  break;
case "defined":
  $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
  break;
}
return $theValue;
}
}

//Query for tblReviews
mysql_select_db($database_em, $em);
$query_getReview = "SELECT reviews.title, reviews.cover_art, reviews.blog_entry, reviews.rating, reviews.published, reviews.updated, artists.artists_name, contributors.contributors_name, contributors.contributors_photo, contributors.contributors_popup, categories_name FROM reviews JOIN artists ON artists.id = reviews.artistid JOIN contributors ON contributors.id = reviews.contributorid JOIN categories ON categories.id = reviews.categoryid ORDER BY reviews.updated DESC LIMIT 3";
$getReview = mysql_query($query_getReview, $em) or die(mysql_error());
$row_getReview = mysql_fetch_assoc($getReview);
$totalRows_getReview = mysql_num_rows($getReview);

mysql_select_db($database_em, $em);
$query_getFeature = "SELECT features.features_words, features.published, features.updated, artists.artists_name, contributors.contributors_name, contributors.contributors_photo, contributors.contributors_popup, categories_name
FROM features JOIN artists ON artists.id = features.artistid JOIN contributors ON contributors.id = features.contributorid JOIN categories ON categories.id = features.categoryid ORDER BY features.updated DESC LIMIT 1";
$getFeature= mysql_query($query_getFeature, $em) or die(mysql_error());
$row_getFeature = mysql_fetch_assoc($getFeature);
$totalRows_getFeature = mysql_num_rows($getFeature);
?>

最后是显示所有内容的地方(我将包含所有内容，以防在我尝试进行迁移时，一行或其他行破坏了某些内容)：

<?php do { ?>
<table id="center_table" width="650" border="0" cellpadding="0" cellspacing="0">
<tr>
    <td width="650" height="30" colspan="3" bgcolor="#FFFFFF"><a class="category" href="/" target="_top"><?php echo $row_getReview['categories_name']; ?></span></td><!-- category -->
</tr>
<tr>
    <td  width="60" height="60" rowspan="2" bgcolor="#FFFFFF"><span class="product_photo"><a href="<?php echo $row_getReview['cover_art']; ?>"><img id="product_photo" src="images/covers/<?php echo $row_getReview['cover_art']; ?>" width="60" height="60" border="0" alt="product_image" /></a><span></td><!-- product photo -->
    <td width="590" height="30" colspan="2" bgcolor="#FFFFFF"><span class="artist"><?php echo $row_getReview['artists_name']; ?></span><span class="title"><?php echo $row_getReview['title']; ?></td><!-- artist & title -->
</tr>
<tr>
    <td width="35" height="25" bgcolor="#FFFFFF"><div class="ienlarger"><img id="contributor_photo" /><a href="<?php echo $row_getReview['contributors_website']; ?>"><img src="<?php echo $row_getReview['contributors_photo']; ?>" alt="thumb" class="resize_thumb" /><span><img src="<?php echo $row_getReview['contributors_popup']; ?>" alt="large" /></span></a></div></td><!-- contributor photo -->
    <td width="555" height="25" bgcolor="#FFFFFF"><span class="contributor">Written by</span>&nbsp;<?php echo $row_getReview['contributors_name']; ?></td><!-- Written by Contributor Name -->
</tr>
<tr>
    <td width="650" colspan="3" bgcolor="#FFFFFF" valign="top"><p class="blog_entry"><?php echo nl2br($row_getReview['blog_entry']); ?></p></td><!-- Review -->
</tr>
<tr>
    <td width="650" height="15" colspan="3" bgcolor="#FFFFFF"><!-- rating -->
        <span class="rating">Rating :</span>&nbsp;<?php echo $row_getReview['rating']; ?>&nbsp;(out of a possible 1,000,000)<span class="published">Published :</span>&nbsp;<?php echo $row_getReview['published']; ?><span class="published">Updated :</span>&nbsp;<?php echo $row_getReview['updated']; ?></td>
</tr>
<tr>
    <td width="650" height="15" colspan="3" bgcolor="#FFFFFF">
        <img src="images/spacer.gif" width="650" height="15" alt="" /></td>
</tr>
</table>
<?php } while ($row_getReview = mysql_fetch_assoc($getReview)); ?>
<?php do { ?>
<table id="center_table" width="650" border="0" cellpadding="0" cellspacing="0">
<tr>
    <td width="650" height="30" colspan="3" bgcolor="#FFFFFF"><a class="category" href="/" target="_top"><?php echo $row_getFeature['categories_name']; ?</span></td><!-- category -->
</tr>
<tr>
    <td  width="60" height="60" rowspan="2" bgcolor="#FFFFFF">&nbsp;</td><!-- product photo -->
    <td width="590" height="30" colspan="2" bgcolor="#FFFFFF"><span class="artist"><?php echo $row_getFeature['artists_name']; ?></span><span class="title">Interview</td><!-- artist & title -->
</tr>
<tr>
    <td width="35" height="25" bgcolor="#FFFFFF"><div class="ienlarger"><img id="contributor_photo" /><a href="<?php echo $row_getFeature['contributors_website']; ?>"><img src="<?php echo $row_getFeature['contributors_photo']; ?>" alt="thumb" class="resize_thumb" /><span><img src="<?php echo $row_getFeature['contributors_popup']; ?>" alt="large" /></span></a></div></td><!-- contributor photo -->
    <td width="555" height="25" bgcolor="#FFFFFF"><span class="contributor">Written by</span>&nbsp;<?php echo $row_getFeature['contributors_name']; ?></td><!-- Written by Contributor Name -->
</tr>
<tr>
    <td width="650" colspan="3" bgcolor="#FFFFFF" valign="top"><p class="blog_entry"><?php echo nl2br($row_getFeature['features_words']); ?></p></td><!-- Feature -->
</tr>
<tr>
    <td width="650" height="15" colspan="3" bgcolor="#FFFFFF"><!-- rating -->
        <span class="published">Published :</span>&nbsp;<?php echo $row_getFeature['published']; ?><span class="published">Updated :</span>&nbsp;<?php echo $row_getFeature['updated']; ?></td>
</tr>
<tr>
    <td width="650" height="15" colspan="3" bgcolor="#FFFFFF">
        <img src="images/spacer.gif" width="650" height="15" alt="" /></td>
</tr>
</table>
<?php } while ($row_getFeature = mysql_fetch_assoc($getFeature)); ?>

正如您所看到的，到目前为止还没有太多东西，所以现在是开始使用mysqli的最佳时机。

Answer 1

就我个人而言，我认为您现在应该开始使用mysqli，因为不再推荐使用mysql来编写新代码(http://www.php.net/manual/en/intro.mysql.php)。

同样提到这个线程Which is fastest in PHP- MySQL or MySQLi?，"mysqli支持底层MySQL的更多特性，比如事务和带参数的准备好的查询。你也可以以面向对象的方式调用mysqli函数“。