數據表+列搜索+綜合搜索結合+服務器端處理

Question

我下面這個教程工作： http://coderexample.com/datatable-custom-column-search/

，這裏是演示： http://coderexample.com/demo/dataTable-custom-column-search/

注意在演示搜索輸入刪除/隱藏。
這裏是一個工作FIDDLE但這不是一個服務器端的例子，但列搜索和總體搜索與測試數據結合在一起工作。

這裏是做每列

## Columns Search 
$sql = "SELECT employee_name, employee_salary, employee_age "; 
$sql.=" FROM employee WHERE 1 = 1"; 

// getting records as per search parameters 
if(!empty($requestData['columns'][0]['search']['value'])){ //name 
    $sql.=" AND employee_name LIKE '%".$requestData['columns'][0]['search']['value']."%' "; 
} 
if(!empty($requestData['columns'][1]['search']['value'])){ //salary 
    $sql.=" AND employee_salary LIKE '%".$requestData['columns'][1]['search']['value']."%' "; 
} 
if(!empty($requestData['columns'][2]['search']['value'])){ //age 
    $sql.=" AND employee_age LIKE '%".$requestData['columns'][2]['search']['value']."%' "; 
} 
$query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); 
$totalFiltered = mysqli_num_rows($query); // when there is a search parameter then we have to modify total number filtered rows as per search result. 

$sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']." LIMIT ".$requestData['start']." ,".$requestData['length']." "; // adding length 

$query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); 

這裏的過濾代碼，做每整個搜索輸入濾波代碼：

// if there is a search parameter 
if(!empty($requestData['search']['value'])) { 
    // if there is a search parameter 
    $sql = "SELECT employee_name, employee_salary, employee_age "; 
    $sql.=" FROM employee"; 
    $sql.=" WHERE employee_name LIKE '%".$requestData['search']['value']."%' "; // $requestData['search']['value'] contains search parameter // to search for ou to get satou 
    $sql.=" OR employee_salary LIKE '%".$requestData['search']['value']."%' "; 
    $sql.=" OR employee_age LIKE '%".$requestData['search']['value']."%' "; 
    $query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); 
    $totalFiltered = mysqli_num_rows($query); // when there is a search parameter then we have to modify total number filtered rows as per search result without limit in the query 

    $sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']." LIMIT ".$requestData['start']." ,".$requestData['length']." "; // $requestData['order'][0]['column'] contains colmun index, $requestData['order'][0]['dir'] contains order such as asc/desc , $requestData['start'] contains start row number ,$requestData['length'] contains limit length. 
    $query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); // again run query with limit 

} else {  

    $sql = "SELECT employee_name, employee_salary, employee_age "; 
    $sql.=" FROM employee"; 
    $sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']." LIMIT ".$requestData['start']." ,".$requestData['length']." "; 
    $query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); 

} 

什麼，我想要做的就是讓所有根據上面的小提琴示例（例如中的o和overall search中的2），列搜索和整體搜索協同工作。

我原以爲這是與if語句有關。我嘗試了各種各樣的排列，但認爲可能還有更多。任何人都可以建議嗎？

if(!empty($requestData['search']['value'])) { 
    //code here 
} 
if(!empty($requestData['columns'][0]['search']['value'])){ //name 
    //code here 
} 
if(!empty($requestData['columns'][1]['search']['value'])){ //salary 
    //code here 
} 
if(!empty($requestData['columns'][2]['search']['value'])){ //age 
    //code here 
} 

EDIT1

這裏是我有在哪裏放置@Ruslan奧斯曼諾夫的回答不同位困難我的完整代碼。你能建議嗎？我已經嘗試過，但我得到500 (Internal Server Error)所以也許這與我連接到數據庫的命令有關？

<?php 
/* Database connection start */ 
/* $servername = "localhost"; 
$username = "root"; 
$password = "Password1"; 
$dbname = "test"; */ 

$conn = mysqli_connect($servername, $username, $password, $dbname) or die("Connection failed: " . mysqli_connect_error()); 

/* Database connection end */ 


// storing request (ie, get/post) global array to a variable 
$requestData= $_REQUEST; 

$columns = array( 
// datatable column index => database column name 
    0 =>'employee_name', 
    1 => 'employee_salary', 
    2=> 'employee_age' 
); 

// getting total number records without any search 
$sql = "SELECT employee_name, employee_salary, employee_age "; 
$sql.=" FROM employee"; 
$query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); 
$totalData = mysqli_num_rows($query); 
$totalFiltered = $totalData; // when there is no search parameter then total number rows = total number filtered rows. 

//* this column search works but not the overall search 

## Search input 

// if there is a search parameter 
if(!empty($requestData['search']['value'])) { 
    // if there is a search parameter 
    $sql = "SELECT employee_name, employee_salary, employee_age "; 
    $sql.=" FROM employee"; 
    $sql.=" WHERE employee_name LIKE '%".$requestData['search']['value']."%' "; // $requestData['search']['value'] contains search parameter // to search for ou to get satou 
    $sql.=" OR employee_salary LIKE '%".$requestData['search']['value']."%' "; 
    $sql.=" OR employee_age LIKE '%".$requestData['search']['value']."%' "; 
    $query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); 
    $totalFiltered = mysqli_num_rows($query); // when there is a search parameter then we have to modify total number filtered rows as per search result without limit in the query 

    $sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']." LIMIT ".$requestData['start']." ,".$requestData['length']." "; // $requestData['order'][0]['column'] contains colmun index, $requestData['order'][0]['dir'] contains order such as asc/desc , $requestData['start'] contains start row number ,$requestData['length'] contains limit length. 
    $query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); // again run query with limit 

} else {  

    $sql = "SELECT employee_name, employee_salary, employee_age "; 
    $sql.=" FROM employee"; 
    $sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']." LIMIT ".$requestData['start']." ,".$requestData['length']." "; 
    $query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); 

} 


## Columns Search 
$sql = "SELECT employee_name, employee_salary, employee_age "; 
$sql.=" FROM employee WHERE 1 = 1"; 

// getting records as per search parameters 
if(!empty($requestData['columns'][0]['search']['value'])){ //name 
    $sql.=" AND employee_name LIKE '%".$requestData['columns'][0]['search']['value']."%' "; 
} 
if(!empty($requestData['columns'][1]['search']['value'])){ //salary 
    $sql.=" AND employee_salary LIKE '%".$requestData['columns'][1]['search']['value']."%' "; 
} 
if(!empty($requestData['columns'][2]['search']['value'])){ //age 
    $sql.=" AND employee_age LIKE '%".$requestData['columns'][2]['search']['value']."%' "; 
} 
$query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); 
$totalFiltered = mysqli_num_rows($query); // when there is a search parameter then we have to modify total number filtered rows as per search result. 

$sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']." LIMIT ".$requestData['start']." ,".$requestData['length']." "; // adding length 

$query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); 




$data = array(); 
while($row=mysqli_fetch_array($query)) { // preparing an array 
    $nestedData=array(); 

    $nestedData[] = $row["employee_name"]; 
    $nestedData[] = $row["employee_salary"]; 
    $nestedData[] = $row["employee_age"]; 

    $data[] = $nestedData; 
} 



$json_data = array(
      "draw"   => intval($requestData['draw']), // for every request/draw by clientside , they send a number as a parameter, when they recieve a response/data they first check the draw number, so we are sending same number in draw. 
      "recordsTotal" => intval($totalData), // total number of records 
      "recordsFiltered" => intval($totalFiltered), // total number of records after searching, if there is no searching then totalFiltered = totalData 
      "data"   => $data // total data array 
      ); 

echo json_encode($json_data); // send data as json format 

Answer 1

我猜你的SQL有一些邏輯錯誤。我不認爲你需要OR，因爲整體搜索只是爲每列額外的要求：

$conn = mysqli_connect($servername, $username, $password, $dbname) or 
    die("Connection failed: " . mysqli_connect_error()); 

$requestData = $_REQUEST; 

$columns = ['employee_name', 'employee_salary', 'employee_age']; 

$sql = "SELECT COUNT(*) FROM employee"; 
$res = mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); 
$totalData = mysqli_num_rows($res) ? mysqli_fetch_row($res)[0] : 0; 

$overall_search_value = empty($requestData['search']['value']) ? null : 
    mysqli_real_escape_string($conn, $requestData['search']['value']); 

for ($i = 0; $i < count($columns); $i++) { 
    $field = $columns[$i]; 

    $value = empty($requestData['columns'][$i]['search']['value']) ? null : 
    mysqli_real_escape_string($conn, 
     $requestData['columns'][$i]['search']['value']); 

    $q = null; 

    if ($value) { 
    $q []= "$field LIKE '%$value%'"; 
    } 

    if ($overall_search_value) { 
    $q []= "$field LIKE '%$overall_search_value%'"; 
    } 

    if ($q) { 
    // Every column must match overall search string 
    // along with the current column search. 
    $q_where []= '(' . implode(' AND ', $q) . ')'; 
    } 
} 

$q_where = implode(' AND ', $q_where); 
$order_by_col = $columns[$requestData['order'][0]['column']]; 
$order_by_dir = $requestData['order'][0]['dir']; 

$sql = "SELECT employee_name, employee_salary, employee_age 
FROM employee WHERE $q_where 
ORDER BY $order_by_col $order_by_dir 
LIMIT {$requestData['start']}, {$requestData['length']}"; 

$res = mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); 
$totalFiltered = mysqli_num_rows($res); 

$data = []; 
while ($row = mysqli_fetch_assoc($res)) { 
    $data[] = $row; 
} 

echo json_encode([ 
    "draw"   => intval($requestData['draw']), 
    "recordsTotal" => intval($totalData), 
    "recordsFiltered" => intval($totalFiltered), 
    "data"   => $data 
]); 

注mysqli_real_escape_string。你必須逃避一切進入SQL查詢的東西，特別是來自用戶輸入的東西。