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如何运用PHP关联数组查询结果

WBOY
WBOYOriginal
2016-06-13 11:06:22928browse

大家也许对以下就是具体的操作代码:

<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span>   </span></span></li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">connection</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">mysql_connect</font></span><span>("localhost", "albert", "shhh");   </span>
</li>
<li class="alt"><span>mysql_select_db("winestore", $connection);   </span></li>
<li class=""><span> </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">result</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">mysql_query</font></span><span>("SELECT cust_id, surname,   </span>
</li>
<li class=""><span>firstname FROM customer", $connection);   </span></li>
<li class="alt"><span> </span></li>
<li class="">
<span>while ($</span><span class="attribute"><font color="#ff0000">row</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">mysql_fetch_array</font></span><span>($result))   </span>
</li>
<li class="alt"><span>{   </span></li>
<li class=""><span>echo "ID:t{$row["cust_id"]}n";   </span></li>
<li class="alt"><span>echo "Surnamet{$row["surname"]}n";   </span></li>
<li class=""><span>echo "First name:t{$row["firstname"]}nn";   </span></li>
<li class="alt"><span>}   </span></li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span>  </span>
</li>
</ol>

函数 mysql_fetch_array() 把查询结果的一行放入数组,可以同时用两种方式引用,例如 cust_id 可以同时用下面两种方式:$row["cust_id"] 或者$row[0] 。显然,前者的可读性要比后者好多了。

在PHP关联数组查询结果的多表连查中,如果两个列名字一样,最好用别名分开:

SELECT winery.name AS wname,
region.name AS rname,
FROM winery, region
WHERE winery.region_id = region.region_id;


列名的引用为:$row["wname"] 和 $row["rname"]。


在指定表名和列名的情况下,只引用列名:

SELECT winery.region_id
FROM winery

列名的引用为: $row["region_id"]。

聚集函数的引用就是引用名:

SELECT count(*)
FROM customer;

列名的引用为: $row["count(*)"]。

以上就是全部的关于PHP关联数组查询结果的具体操作步骤。


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