发布于 2016-03-07 06:38:05 | 131 次阅读 | 评论: 0 | 来源: 网友投递
Mysql关系型数据库管理系统
MySQL是一个开放源码的小型关联式数据库管理系统,开发者为瑞典MySQL AB公司。MySQL被广泛地应用在Internet上的中小型网站中。由于其体积小、速度快、总体拥有成本低,尤其是开放源码这一特点,许多中小型网站为了降低网站总体拥有成本而选择了MySQL作为网站数据库。
<?php
$dsn = "mysql:host=localhost;dbname=group";
$db = new PDO($dsn, 'root', '');
$db->exec('set names utf8');
$sql = "select conf_id from `group` group by conf_id";
//$pre = $db->prepare($sql);
//$result_arr = array();
$pre = $db->query($sql);
$result_arr = $pre->fetchAll(PDO::FETCH_ASSOC);
//print_r ($result_arr);
foreach ($result_arr as $v)
{
echo $v[conf_id]."<br>";
$vv = $v[conf_id];
$re = array();
$sql1 = "select * from `group` where conf_id = '$v[conf_id]' order by time";
$sql2 = "select * from `group` where conf_id = '$v[conf_id]' order by time DESC";
$rs1 = $db->query($sql1);
$rs2 = $db->query($sql2);
$re1[$vv] = $rs1->fetchAll(PDO::FETCH_ASSOC);
$re2[$vv] = $rs2->fetchAll(PDO::FETCH_ASSOC);
print_r($re1[$vv][0]);
print_r($re2[$vv][0]);
}