Suche nach mehreren Feldern. manchmal durch ein Feld und manchmal mehr als ein Feld

Question

Ich habe Suchformular. hier mehrere Felder. manchmal werde ich einreichen mit einem Feld, manchmal Formular mit zwei und manchmal mehrere Feld Wert einreichen.

 if (isset($_POST['search'])) { 
     $projectName  = $_POST['pName']; 
     $clientId  = $_POST['s_by_clientName']; 
     $departmentId = $_POST['s_by_department']; 
     $statusName = $_POST['s_by_status']; 
     if (!empty($projectName)) 
     { 
      $searchSql = mysql_query("select * from project_list where projectName='$projectName'"); 
     } 

     if (!empty($clientId)) 
     { 
      $searchSql = mysql_query("select * from project_list where client_id='$clientId'"); 
     } 

     if (!empty($departmentId)) 
     { 
      $searchSql = mysql_query("select * from project_list where department_id='$departmentId'"); 
     } 

     if (!empty($statusName)) 
     { 
      $searchSql = mysql_query("select * from project_list where status='$statusName'"); 
     } 

    } 

diese Abfrage nur für von Einfeldsuche. wie Abfrage, die Suche nach einem oder mehreren Feld Wert führt ist es möglich ?? mysql_query() wurde in PHP 5.5 und entfernt in PHP 7 als veraltet:

Answer 1

Verwenden Verkettungs in Abfrage Variable

$searchSql ="select * from project_list where 1=1 "; 
if (isset($_POST['search'])) { 
    $projectName  = $_POST['pName']; 
    $clientId  = $_POST['s_by_clientName']; 
    $departmentId = $_POST['s_by_department']; 
    $statusName = $_POST['s_by_status']; 
    if (!empty($projectName)) 
    { 
     $searchSql. = " AND projectName='$projectName'"; 
    } 
    if (!empty($clientId)) 
    { 
     $searchSql. = " AND client_id='$clientId'"; 
    } 
    if (!empty($departmentId)) 
    { 
     $searchSql. = " AND department_id='$departmentId'"; 
    } 
    if (!empty($statusName)) 
    { 
     $searchSql. = " AND status='$statusName'"; 
    } 
} 
$result=mysql_query($searchSql); 

HINWEIS bauen. Bitte aktualisieren Sie, um die mysqli-Bibliothek von PDO zu verwenden.

Answer 2

Sie können eine increntale Abfrage

<code> 
if (isset($_POST['search'])) { 
    $projectName  = $_POST['pName']; 
    $clientId  = $_POST['s_by_clientName']; 
    $departmentId = $_POST['s_by_department']; 
    $statusName = $_POST['s_by_status']; 
    $my_sql = "select * from project_list "; 
    $my_where = ""; 
    if (!empty($projectName)) 
    { 
     if ($my_where = ""){ 
      $my_sql .= "where "; 
     } else { 
      $my_sql .= "and "; 
     } 
     $my_sql .= "projectName='$projectName'"; 

    } 
    if (!empty($clientId)) 
    { 

     if ($my_where = ""){ 
      $my_sql .= "where "; 
     } else { 
      $my_sql .= "and "; 
     } 
     $my_sql .= "client_id='$clientId'"; 

    } 
    if (!empty($departmentId)) 
    { 
     if ($my_where = ""){ 
      $my_sql .= "where "; 
     } else { 
      $my_sql .= "and "; 
     } 
     $my_sql .= "department_id='$departmentId'"; 


    } 
    if (!empty($statusName)) 
    { 
     if ($my_where = ""){ 
      $my_sql .= "where "; 
     } else { 
      $my_sql .= "and "; 
     } 
     $my_sql .= "status='$statusName'"; 

    } 
} 

Answer 3

Hier verwendete ich Spalte id als primary key & auto-increment. Ändern Sie es gemäß Ihrem Spaltennamen.

$query = "SELECT * FROM project_list WHERE id is not null"; 

-Code

<? 
if (isset($_POST['search'])) { 
    $projectName  = $_POST['pName']; 
    $clientId  = $_POST['s_by_clientName']; 
    $departmentId = $_POST['s_by_department']; 
    $statusName = $_POST['s_by_status']; 

    // Here I used coloumn 'id' as primary key & auto-increment. Change it as per your column name. 
    $query = "SELECT * FROM project_list WHERE id is not null" 

    if (!empty($projectName)) 
    { 
     $query. = " AND projectName='".$projectName."'"; 
    } 
    if (!empty($clientId)) 
    { 
     $query. = " AND client_id='".$clientId."'"; 
    } 
    if (!empty($departmentId)) 
    { 
     $query. = " AND department_id='".$departmentId."'"; 
    } 
    if (!empty($statusName)) 
    { 
     $query. = " AND project_list='".$statusName."'"; 
    } 

    $searchSql = mysql_query($query); 
}