javascript - 数据表+列搜索+整体搜索协同工作+服务器端处理

Question

我正在关注本教程: http://coderexample.com/datatable-custom-column-search/

这是演示: http://coderexample.com/demo/dataTable-custom-column-search/

注意在演示中搜索输入已删除/隐藏。
这是一个工作FIDDLE但这不是服务器端示例，而是列搜索和整体搜索结合使用那里的测试数据。

这是对每列进行过滤的代码

## 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");

这里是对每个整体搜索输入进行过滤的代码:

// 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");

}

我想做的是让所有列搜索和整体搜索结合起来，按照上面的 fiddle 示例(例如员工姓名搜索中的o > 和 2 在整体搜索中)。

我认为这与 if 语句有关。我尝试过各种排列，但认为可能还有更多。有人可以建议吗？

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
}

编辑1

这是我的完整代码，我很难将 @Ruslan Osmanov 的答案的不同部分放在哪里。你能提供建议吗？我已经尝试过，但收到500(内部服务器错误)，所以这可能与我连接到数据库的顺序有关？

<?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 中有一些逻辑错误。我认为您不需要 OR，因为总体搜索只是每列的额外要求:

$conn = mysqli_connect($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
]);

注意mysqli_real_escape_string。您必须转义进入 SQL 查询的所有内容，尤其是来自用户输入的内容。