Question

所以我在这样的页面上有某种代码

<?php
$a = $_GET['act'];
if ($a){
include('show.php');
} else {
include('show.php');
}
?>

以及像这样的其他页面

<?php
$sql2 = "SELECT * from DONE ";
$b = mysqli_query ($con,$sql2);
$r = mysqli_fetch_assoc($b);
.......
?>

<?php
$sql3 = "SELECT * from ONGOING ";
$b = mysqli_query ($con,$sql3);
$r = mysqli_fetch_assoc($b);
.......
?>

我的问题，是否有可能在满足条件时执行第一个查询，当条件不满足时，执行第二个查询，当两个查询都放在同一页面上时？

Answer 1

不是在主页面中添加条件，而是将其添加到包含的页面中，以便您的查询可以条件执行主页

<?php
    $a = $_GET['act'];
    include('show.php');
?>

<强> show.php

<?php
if ($a){
$sql2 = "SELECT * from DONE ";
$b = mysqli_query ($con,$sql2);
$r = mysqli_fetch_assoc($b);
//.......
}
else
{
$sql3 = "SELECT * from ONGOING ";
$b = mysqli_query ($con,$sql3);
$r = mysqli_fetch_assoc($b);
//.......
}
?>

Answer 2

这正是PHP has functions的原因。在您包含的文件中，将这两件事组织成单独的代码块：

<?php
function fromDone($con) {
  $b = mysqli_query($con,"SELECT * from DONE ");
  $r = mysqli_fetch_assoc($b);
  .......
}

function fromOngoing($con) {
  $b = mysqli_query ($con,"SELECT * from ONGOING");
  $r = mysqli_fetch_assoc($b);
  .......
}
?>

然后在你的主文件中你可以这样做：

<?php
if ($_GET['act']) {
  fromDone($con);
} else {
  fromOngoing($con);
}
?>

Answer 3

<?php

$a = $_GET['act'];
if($a)
$sql = "SELECT * from DONE ";
else
$sql = "SELECT * from ONGOING ";

$b = mysqli_query ($con,$sql);
$r = mysqli_fetch_assoc($b);
.......
?>

Answer 4

使用变量来判断要运行的查询。

<?php
    $a = $_GET['act'];
    if ($a){
        include('show.php');
        $code = 1;
    }
    else {
        include('show.php');
        $code = 2;
    }
?>



<?php 
    if($code == 1){
        $sql = "SELECT * from DONE ";
    }
    else{
        $sql = "SELECT * from ONGOING ";
    }
?>

<?php
    $b = mysqli_query ($con,$sql);
    $r = mysqli_fetch_assoc($b);
    .......
?>

Answer 5

<?php
$a = $_GET['act'];
if ($a){
include('show.php?condition=ok');
} else {
include('show.php?condition=notok');
}
?>

以及像这样的其他页面

<?php
if($_GET['condition']=='ok')
{
$sql2 = "SELECT * from DONE ";
$b = mysqli_query ($con,$sql2);
$r = mysqli_fetch_assoc($b);
.......
}
else if($_GET['condition']=='notok') {

$sql3 = "SELECT * from ONGOING ";
$b = mysqli_query ($con,$sql3);
$r = mysqli_fetch_assoc($b);
.......
} else {  

//other stuff

}
?>

Answer 6

Main.php

<?php
    $a = $_GET['act'];
    if($a)
       $table='tableone';
    else
       $table='tabletwo';

    include('show.php?table=$table');
?>

show.php

<?php

  $sql = "SELECT * from ".$_GET['table'];
  $b = mysqli_query ($con,$sql);
  $r = mysqli_fetch_assoc($b);
?>

从一个文件中选择查询

6 个答案: