Question

<html>
    <form action="search_book.php" method="post">
        Title:<input type="text" name="title"><br>
        Author:<input type="text" name="author"><br>
        Price of Book:<input type="text" name="price"><input type="radio"    name="radio" id="less"><Label for="less">Less Than</label><input type="radio" name="radio" id="more"><label for ="more">More Than</label<<br>
        <input type="submit" value="Search">
    </form>
</html>

当用户通过标题，作者或价格（html表单字段）搜索mysql表中的记录时，我使用了if/else if语句并发布了函数。我的if / else if语句基于用户一次输入一个表单字段：

if($_POST['title']!="" && $_POST['title']!=" "){
    $title=$_POST['title'];
    $query=mysqli_query($con,"SELECT * from book where Title='$title'");
} else if($_POST['author']!=""&& $_POST['author']!=" "){
    $title=$_POST['author'];
    $query=mysqli_query($con,"SELECT * from book where Author='$author'");
} else if($_POST['price']!="" && $_POST['price']!=" "){
    $title=$_POST['price'];
    $query=mysqli_query($con,"SELECT * from book where Price='$price'");
}

我现在需要把它提升到一个新的水平并想知道：

如果用户输入两个或三个字段而不仅仅是一个字段（例如作者和价格或作者和标题），如何检索表记录
靠近＆＃39;价格＆＃39;文本字段我需要添加两个单选按钮，允许用户检查的价格低于或高于他在文本框中输入的价格

Answer 1

   // Use the Below code it will work for all
   $condition=""; 
   if(isset($_POST) && !empty($_POST)) { 
     if(trim($_POST['title'])!="") {
        $condition.="Title='".$_POST['title']."' AND "; 
     }
    if(trim($_POST['author'])!="") {
      $condition.="Author='".$_POST['author']."' AND "; 
    }
    if(trim($_POST['price'])!="") {
       $condition.="Price='".$_POST['price']."' AND "; 
    }
      // remove last AND 
      if($condition!="") {
          $condition=" WHERE ".substr($condition,0,-5); 
      }

     $query=mysqli_query($con,"SELECT * from book".$condition); 
  }

//它会起作用

用户输入多个表单域以通过php从mysql表中检索相关记录

1 个答案: