Question

我现在有三个不同的PHP页面，它们包含几乎相同的信息，因此能够将其减少到一个页面我需要在mysql查询中有一个php变量。今天是这样的：

$query1  = "SELECT * FROM `Yrker` WHERE `Kategori` = '1' AND `Bruk` = '1' ORDER BY yearstart DESC, mndstart DESC";`

如果我在地址栏中输入？nobruk = no，我需要从此查询行中删除“AND Bruk ='1'”。这是可能的，如果是的话，怎么样？

Answer 1

您不希望（也不能）在查询中添加if;您希望使用 if根据某些条件创建查询。有很多方法可以写这个，其中一个是

if (!empty($_GET['nobruk'])) {
    $query1 = "SELECT ... WHERE `Kategori` = '1' ORDER BY ...";
}
else {
    $query1 = "SELECT ... WHERE `Kategori` = '1' AND `Bruk` = '1' ORDER BY ...";
}

另一种更短且涉及ternary operator的方式是

$includeBruk = empty($_GET['nobruk']);
$query1 = "SELECT ... WHERE `Kategori` = '1' ".
          ($includeBruk ? "AND `Bruk` = '1' " : "").
          "ORDER BY ...";

Answer 2

一个简单的if语句：

$query1  = "SELECT * FROM `Yrker` WHERE `Kategori` = '1'";
  if ($_GET['nobruk']!='no') {
    $query1.=" AND `Bruk` = '1'";
  }
$query1.= " ORDER BY yearstart DESC, mndstart DESC";

Answer 3

像这样：

<?php

$query = ($_REQUEST['nobruk'] == "no") ? "SELECT * FROM `Yrker` WHERE `Kategori` = '1' ORDER BY yearstart DESC, mndstart DESC": "SELECT * FROM `Yrker` WHERE `Kategori` = '1' AND `Bruk` = '1' ORDER BY yearstart DESC, mndstart DESC";
echo $query;
?>

如果在mysql查询中有参数

3 个答案: