数据表+列搜索+综合搜索结合+服务器端处理

Question

我下面这个教程工作： http://coderexample.com/datatable-custom-column-search/

，这里是演示： http://coderexample.com/demo/dataTable-custom-column-search/

注意在演示搜索输入删除/隐藏。
这里是一个工作FIDDLE但这不是一个服务器端的例子，但列搜索和总体搜索与测试数据结合在一起工作。

这里是做每列

## 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"); 

这里的过滤代码，做每整个搜索输入滤波代码：

// 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"); 

} 

什么，我想要做的就是让所有根据上面的小提琴示例（例如中的o和overall search中的2），列搜索和整体搜索协同工作。

我原以为这是与if语句有关。我尝试了各种各样的排列，但认为可能还有更多。任何人都可以建议吗？

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 
} 

EDIT1

这里是我有在哪里放置@Ruslan奥斯曼诺夫的回答不同位困难我的完整代码。你能建议吗？我已经尝试过，但我得到500 (Internal Server Error)所以也许这与我连接到数据库的命令有关？

<?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有一些逻辑错误。我不认为你需要OR，因为整体搜索只是为每列额外的要求：

$conn = mysqli_connect($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。你必须逃避一切进入SQL查询的东西，特别是来自用户输入的东西。