php轮流取数据 php数据库随机读取十个数据

PHP循环取数据问题看看这段代码,不知道对你有没有用
table
?php
$images = array('a','b','c','d','e');
foreach ($images as $k = $img) {
if ($k%4==0) echo 'tr';
echo 'tdimg src="'.$img.'" //td';
if ($k%4==3) echo '/tr';
}
echo str_repeat('td /td',3-$k%4);
?
/table
php 循环读取数据问题 。。。。。。
这个函数???令人很迷惑
它的逻辑是什么呢?为什么是先判断 $this-error,而不是query后再判断呢?
还有以下一句;
return odbc_exec($this-link,$sql) or $this-display_error($sql);
目的是想如果odbc_exec 成功则返回结果集,否则就输出错误吗?但事实上是不对的 。等价于以下:
return (odbc_exec($this-link,$sql) or $this-display_error($sql));
显然,每次都display_error了,不管是否成功
这是函数odbc_fetch_row的定义:
odbc_fetch_row
(PHP 4, PHP 5)
odbc_fetch_row — Fetch a row
Description
bool odbc_fetch_row ( resource $result_id [, int $row_number] )
If odbc_fetch_row() was successful (there was a row), TRUE is returned. If there are no more rows, FALSE is returned.
odbc_fetch_row() fetches a row of the data that was returned by odbc_do() / odbc_exec(). After odbc_fetch_row() is called, the fields of that row can be accessed with odbc_result().
If row_number is not specified, odbc_fetch_row() will try to fetch the next row in the result set. Calls to odbc_fetch_row() with and without row_number can be mixed.
To step through the result more than once, you can call odbc_fetch_row() with row_number 1, and then continue doing odbc_fetch_row() without row_number to review the result. If a driver doesn't support fetching rows by number, the row_number parameter is ignored.
可以看到,odbc_fetch_row并不像其它函数例如mysql_fetch_row那样返回一个数组,而是返回一个布尔型的变量,然后在用odbc_result获取指定字段的值 。
修改如下:
?
$databasepath="database.mdb";//写成常量,define('databasepath',"database.mdb");赋值给变量$databasepath=databasepath;
$dbusername="";
$dbpassword="";
$access=new Access($databasepath,$dbusername,$dbpassword,true);
$conn=$access-query("select * from admin");
while (odbc_fetch_row($conn)) {
?
tr
td class="td1"?=odbc_result($conn, "name")?/td
/tr
tr
td class="td1"?=odbc_result($conn, "area")?/td
/tr
【php轮流取数据 php数据库随机读取十个数据】?php
}
$access-close();
?
请下载PHP参考手册
PHP分割,并循环获取数据,需用到正则表达式 , 高分悬赏,答对追加100分$str="ABC'; F(ZZZ), KSEKKS(YYY), PSX-D.M(XXX)";
$srta=explode(", ",$str); foreach ($srta as $k=$t)
{
$srtb=explode("(",$t);
echo 'a href="https://www.04ip.com/post/#" title="'.str_replace(")","",$srtb[1]).'" /'.preg_replace("/[^A-Z-]+/","-",$srtb[0])."/a, ";
}
php mysql 读取数据循环用嵌套循环
$exec0="select * from 表B";
$result0=mysql_query($exec0);
while($rs0=mysql_fetch_object($result0))
{
$category_name=$rs0-category_name;
echo $category_name."brbrbr"; //输出B表中的商品类型
$exec1="select * from 表A where category_name=".$category_name; //查询条件设为A表中的商品类型等于B表中的商品类型
$result1=mysql_query($exec1);
while($rs1=mysql_fetch_object($result1))
{echo $rs1-product_category."br"; } //循环输出A商品中属于B表商品类型的商品名
}
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