进行 PHP MySql 搜索

Question

我正在我的应用中创建搜索功能， 我有用户名、名称和地区， 所以谁能告诉我实现它的最佳方法。 它应该就像用户在搜索中输入的任何内容一样，脚本应该搜索数据库并获取所需的详细信息。 //我的代码在这里

<?php
include_once("db.php");
if(isset($_POST['district'])){
    $district=$_POST['district'];
}
if(isset($_POST['designation'])){
    $design=$_POST['designation'];
}
if(isset($_POST['name'])){
    $name=$_POST['name'];
}
if(isset($_POST['department'])){
    $dept=$_POST['department'];
}
$result=array();
$response=array();
if((isset($design)) &&(!isset($district)) && (!isset($name)))
{
    $a=$design;
    $stmt=$db->prepare("SELECT * FROM search WHERE designation LIKE ?");
    $stmt->bind_param("s",$a);
    $stmt->execute();
    $d=$stmt->get_result();
    while($b=$d->fetch_array(MYSQLI_ASSOC)){
        $result[]=$b;
}
}
else if((isset($district)) &&(!isset($design)) && (!isset($name)))
{
    $a=$district;
    $stmt=$db->prepare("SELECT * FROM search WHERE district LIKE ?");
    $stmt->bind_param("s",$a);
    $stmt->execute();
    $d=$stmt->get_result();
    while($b=$d->fetch_array(MYSQLI_ASSOC)){
        $result[]=$b;

    }
}
else if((isset($name)) &&(!isset($district)) && (!isset($district))){
    $a=$name;
    $stmt=$db->prepare("SELECT * FROM search WHERE name LIKE ?");
    $stmt->bind_param("s",$a);
    $stmt->execute();
    $d=$stmt->get_result();
    while($b=$d->fetch_array(MYSQLI_ASSOC)){
        $result[]=$b;

    }
}
if((isset($name))&& (isset($design))){
    $stmt=$db->prepare("SELECT * FROM search WHERE name LIKE ? AND designation LIKE ?");
    $stmt->bind_param("ss",$name,$design);
    $stmt->execute();
    $d=$stmt->get_result();
    while($b=$d->fetch_array(MYSQLI_ASSOC)){
        $result[]=$b;
    }
}
if(isset($dept)){
    $stmt=$db->prepare("SELECT * FROM search WHERE department LIKE ?");
    $stmt->bind_param("s",$dept);
    $stmt->execute();
    $d=$stmt->get_result();
    while($b=$d->fetch_array(MYSQLI_ASSOC)){
        $result[]=$b;

    }
}
$response['result']=$result;
echo json_encode($response)
?>

以上是完整代码。

Answer 1

利用 ajax 请求。 你的 MySql 查询应该是：

select * from user where uname like %username% or designation like %designation% or district like %district%

不要忘记使用参数化查询。

希望有帮助。

Answer 2

首先，您需要更改 !empty 和 empty 而不是 isset 和 !isset，因为您将变量设置在顶部，因此它将始终设置并且将在每个条件下所以我将其更改为空，如下面的代码所示。

之后，您可以使用满足条件的参数创建一个数组，最后我已经在 SQL 中实现了它并使用 join 绑定参数，希望它对您有用。

<?php
include_once("db.php");



$result=array();
$response=array();

if(isset($_POST['keyword']) && !empty($_POST['keyword']))
{
    $keyword = $_POST['keyword'];
    $sql = "SELECT * FROM search WHERE CONCAT(designation,' ', district, ' ', department, ' ',name) LIKE ?";

    $stmt=$db->prepare($sql);
    $key = "%".$keyword."%";
    $stmt->bind_param("s",$key);
    $stmt->execute();
    $d=$stmt->get_result();
    while($b=$d->fetch_array(MYSQLI_ASSOC)){
        $result[]=$b;
    }
    $response['result']=$result;
    echo json_encode($response);
} else {
    echo json_encode(array("message"=>"Keyword is not defined"));
}

?>

Answer 3

试试这个..我会执行它。

`$query='SELECT * FROM search WHERE ';
$stmt;
if(isset($_POST['district'])){
    $query+='district like @district '
    $stmt=$db->prepare($query);
    $stmt->bind_param(@district,$_POST['district']);

}
if(isset($_POST['designation'])){
    if(strlen($query>27))// district is set
    {
        $query+=' AND ';
    }
   $query+='district like @designation'
    $stmt=$db->prepare($query);
    $stmt->bind_param(@designation,$_POST['designation']);
}
if(isset($_POST['name'])){
    if(strlen($query>27))// district/design  is set
    {
        $query+=' AND ';
    }
    $query+='district like @name'
    $stmt=$db->prepare($query);
    $stmt->bind_param(@name,$_POST['name']);
}
if(isset($_POST['department'])){
  if(strlen($query>27))// district/design/dept  is set
    {
        $query+=' AND ';
    }
    $query+='district like @department'
    $stmt=$db->prepare($query);
    $stmt->bind_param(@department,$_POST['department']);
}
$result=array();
$d=$stmt->get_result();
    while($b=$d->fetch_array(MYSQLI_ASSOC)){
        $result[]=$b;
    }`