使用选项编码 PHP/MYSQL 搜索的最佳方法 [关闭]

Posted 2023-03-10

【中文标题】使用选项编码 PHP/MYSQL 搜索的最佳方法 [关闭]

【英文标题】：Best way to code PHP/MYSQL search with options [closed]

【发布时间】：2015-07-13 20:28:40

【问题描述】：

所以我正在构建一个搜索表单，它有很多选项供用户选择。正如您从下图中看到的那样，用户选择了搜索条件，并允许他们输入或检查他们喜欢的内容。如果未选中此项，则会删除所有值/取消选中所有框。

我最初只有体重/身高/性别作为搜索，但从那以后增加了更多。

我已经对体重/身高/性别搜索选项进行了编码，结果是大量的 if 语句检查选择/空的内容，然后创建适当的 mysql 查询。

我不完全确定我应该如何处理其他选项（如果我应该重新开始）。有没有更容易的方法？我只是需要一些指导，这样我才能使它更有效。

谢谢！

require 'functions.php';
	
	//Search data
	//$weight_min = $_POST['weight_min'];
	//$weight_max = $_POST['weight_max'];
	//$height_min = $_POST['height_min'];	
	//$height_max = $_POST['height_max'];
	//$gender_select = $_POST['gender_select'];
	
	if("" == trim($_POST['weight_min']))
    	$weight_min = '';
	
	else
	
		$weight_min = $_POST['weight_min'];
	
	
	if("" == trim($_POST['weight_max']))
    	$weight_max = '';
	
	else
	
		$weight_max = $_POST['weight_max'];
	
	
	if("" == trim($_POST['height_min']))
    	$height_min = '';
	
	else
	
		$height_min = $_POST['height_min'];
	
	
	if("" == trim($_POST['height_max']))
    	$height_max = '';
	
	else
	
		$height_max = $_POST['height_max'];
	
	
	if (!isset($_POST['gender_select']))
    	
		$gender_select = '';
	
	else
	
		$gender_select = $_POST['gender_select'];
	
	
	//Show test 
	//echo "sent: weight-min: " .$weight_min. " weight-max: " .$weight_max. " height-min: ".$height_min." height-max: ".$height_max." gender-select: ".$gender_select."<p>";
	
	check_null_values($weight_min, $weight_max, $height_min, $height_max, $gender_select);
	

	function check_null_values($weight_min, $weight_max, $height_min, $height_max, $gender_select)
	
		//Weight
		if($weight_min !=null && $weight_max != null && $height_min == null && $height_max == null && $gender_select == null)
		
			select_weight($weight_min, $weight_max);
			//echo "select_weight";
		
		//Height
		else if($weight_min == null && $weight_max == null && $height_min != null && $height_max != null && $gender_select == null)
		
			select_height($height_min, $height_max);
			//echo "select_height";
			
		//Gender
		else if($weight_min == null && $weight_max == null && $height_min == null && $height_max == null && $gender_select != null)
		
			select_gender($gender_select);
			//echo "select_gender";
		
		//Weight + Height
		else if($weight_min != null && $weight_max != null && $height_min != null && $height_max != null && $gender_select == null)
		
			select_weight_height($weight_min, $weight_max, $height_min, $height_max);
			//echo "select_weight_height";
		
		//Weight + Gender
		else if($weight_min != null && $weight_max != null && $height_min == null && $height_max == null && $gender_select != null)
		
			select_weight_gender($weight_min, $weight_max, $gender_select);
			//echo "select_weight_gender";
		
		//Height + Gender
		else if($weight_min == null && $weight_max == null && $height_min != null && $height_max != null && $gender_select != null)
		
			select_height_gender($height_min, $height_max, $gender_select);
			//echo "select_height_gender";
		
		//All
		else if($weight_min != null && $weight_max != null && $height_min != null && $height_max != null && $gender_select != null)
		
			select_all($weight_min, $weight_max, $height_min, $height_max, $gender_select);
			//echo "select_all";
		
		else if($weight_min == null && $weight_max == null && $height_min == null && $height_max == null && $gender_select == null)
		
			select_none();
			//echo "select_none";
		
		else
		
			//echo "Please enter missing parameter";
		
	
	
	

//Weight only selected
	function select_weight($weight_min, $weight_max)
	
		include 'db_connect.php';
		$result = mysqli_query($db, 
		"SELECT * FROM character_information 
		WHERE 
		(char_min_weight BETWEEN '".$weight_min."' AND '" .$weight_max."'
		OR char_max_weight BETWEEN '".$weight_min."' AND '" .$weight_max."')
		OR
		('".$weight_min."' BETWEEN char_min_weight AND char_max_weight
		OR '" .$weight_max."' BETWEEN char_min_weight AND char_max_weight)
		");
		
		return get_result($result);
	
	
	//Height only selected
	function select_height($height_min, $height_max)
	
		include 'db_connect.php';
		$result = mysqli_query($db, 
		"SELECT * FROM character_information 
		WHERE 
		(char_min_height BETWEEN '".$height_min."' AND '" .$height_max."'
		OR char_max_height BETWEEN '".$height_min."' AND '" .$height_max."')
		OR
		('".$height_min."' BETWEEN char_min_height AND char_max_height
		OR '" .$height_max."' BETWEEN char_min_height AND char_max_height)
		");
		
		get_result($result);
	
	
	//Gender only selected
	function select_gender($gender_select)
	
		include 'db_connect.php';
		
		$result = mysqli_query($db, 
		"SELECT * FROM character_information 
		WHERE char_gender = '".$gender_select."'
		");	
		
		get_result($result);	
		
	
	
	//Weight + Height selected
	function select_weight_height($weight_min, $weight_max, $height_min, $height_max)
	
		include 'db_connect.php';
		
		$result = mysqli_query($db, 
		"SELECT * FROM character_information 
		WHERE 
		((char_min_weight BETWEEN '".$weight_min."' AND '" .$weight_max."'
		OR char_max_weight BETWEEN '".$weight_min."' AND '" .$weight_max."')
		OR
		('".$weight_min."' BETWEEN char_min_weight AND char_max_weight
		OR '" .$weight_max."' BETWEEN char_min_weight AND char_max_weight))
		AND
		((char_min_height BETWEEN '".$height_min."' AND '" .$height_max."'
		OR char_max_height BETWEEN '".$height_min."' AND '" .$height_max."')
		OR
		('".$height_min."' BETWEEN char_min_height AND char_max_height
		OR '" .$height_max."' BETWEEN char_min_height AND char_max_height))
		");	
		
		get_result($result);
	

【问题讨论】：

您能否发布一个简短的代码示例来说明您当前的方法？

您可以遍历 POST 或 GET 值并动态构建您的查询。请务必从查询中分离出用户值。

贴出我的一些代码！是的，我正在考虑做循环。我目前所做的方式一点都不好

您可能想要定义一个“过滤器”类，其中包含选项蜂对象。这样您就可以简单地清理输入，并将对象数组作为函数参数。

我不明白你为什么要为此循环到任何地方。

【参考方案1】：

这是动态构建查询的常用方法的伪代码：

$qry = 'SELECT * FROM character_information WHERE ';
// If the user entered a max height criteria
if ($max_height) 
   $qry .= 'char_weight <= :max_height';
 else 
   $qry .= '1 = 1';

$qry .= ' AND ';
// If the user entered a min height criteria
if ($min_height) 
   $qry .= 'char_weight >= :min_height';
 else 
   $qry .= '1 = 1';

$qry .= ' AND ';
// If the user entered a body build criteria
if ($body_build) 
   $qry .= 'char_body_build = :body_build';
 else 
   $qry .= '1 = 1';

$qry .= ' AND ';
...
// Prepare and bind params here

【参考方案2】：

我就是这样用的：

if(empty($_GET['weightMin'])) 
    $weightMin= null;
 else $weightMin= $_GET['weightMin'];

if(empty($_GET['weightMax'])) 
    $weightMax= null;
 else $weightMin= $_GET['weightMax'];

声明将是：

SELECT * FROM TABLE 
WHERE ((weight >= :weighttMin AND weight <= :weightMax) OR (weight >= :weightMin AND :weightMax is null) OR (weight <= :weightMax AND :weightMin is null) OR (:weightMax is null AND :weightMin is null))

x

否则，如果这只是“性别”之类的一种类型：

if(empty($_GET['gender'])) 
    $gender = null;
 else $gender = $_GET['gender'];

SQL：

SELECT * FROM TABLE
WHERE (gender = :gender or :gender is null)

如果选择了性别，它会搜索好的那个，否则它返回true并且不影响你的陈述。

组合查询：

SELECT * FROM TABLE 
WHERE
((weight >= :weighttMin AND weight <= :weightMax) OR (weight >= :weightMin AND :weightMax is null) OR (weight <= :weightMax AND :weightMin is null) OR (:weightMax is null AND :weightMin is null))
AND
(gender = :gender or :gender is null)

【讨论】：

要让 MySQL 正确评估它并允许它利用标准上的索引而不是扫描，您需要通过添加 IS NOT NULL 来扩展它，例如：((:weightMin IS NULL AND :weightMax IS NULL) OR (:weightMin IS NOT NULL AND :weightMax IS NULL AND weight >= :weightMin) OR ...。