我正在学习mysqli,我正在尝试查询数据库并返回多行。我知道循环必须用于返回多行,但我不知道如何将其实现到我的代码中。一些帮助这样做将非常感激。
$query2 = mysqli_query($con,"SELECT * FROM journeys WHERE id = $id");
$count = mysqli_num_rows($query2);
if ($count == 0) {
$journeys = 'You have no future journeys.';
} else {
while ( $row = mysqli_fetch_assoc($query2) ) {
$from = $row ['origin'];
$to = $row ['destination'];
$date = $row ['date'];
$hour = $row ['hour'];
$minute = $row ['minute'];
$journeyid = $row ['journeyid'];
答案 0 :(得分:1)
试试这段代码
<?php
$con= mysqli_connect('localhost', 'root', '', 'your data base name');
$query2 = mysqli_query($con,"SELECT * FROM journeys where id=$id");
$count = mysqli_num_rows($query2);
if ($count == 0) {
$journeys = 'You have no future journeys.';
echo $journeys;
} else {
while ( $row = mysqli_fetch_assoc($query2) ) {
$from = $row ['origin'];
$to = $row ['destination'];
$date = $row ['date'];
$hour = $row ['our'];
$minute = $row ['minute'];
$journeyid =$row ['journeyid'];
echo $from.'<br>';
}
}
看看这行echo $ from;这将显示数据库中origin列中的所有内容,如果要显示目标,请使用此以及echo $ to; 表示你想要显示的内容就像echo $ variableName;它会显示结果;
在显示结果之前,它只会存储它,但不会显示它,
看看我改变你的这行代码
它的代码
if ($count == 0) {
$journeys = 'You have no future journeys.';
echo $journeys;// i added this line
我添加了一行,因为你在这里说的是,如果$ count等于零,那么$ journeys =&#39;你没有未来的旅程&#39 ;;但你没有使用echo你必须使用echo来显示结果。
如果你仍然有一些困惑,请再次询问,并尝试谷歌
答案 1 :(得分:-1)
$query2 = mysqli_query($con,"SELECT * FROM journeys WHERE id = $id");
$row = mysql_fetch_array($query2);
$count = count($row);
if(intval($count)>0)
{
for($i = 0; $i<$count; $i++)
{
$from[$i] = $row[$i]['origin'];
-------------------------------
----------------------
}
}