如何使用这种方法（数据表）逐字搜索？

Question

这是我使用的代码，它只搜索（从第一个字母到最后一个字母）而不是逐字搜索。怎么可能逐字逐句（关键字）？

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

$conn = mysqli_connect($servername, $username, $password, $dbname) or die("Connection failed: " . mysqli_connect_error());
mysqli_set_charset($conn,"utf8");
/* Database connection end */


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


$columns = array( 
// datatable column index  => database column name
    0=> 'app_id',
    1 =>'fullname',


);

// getting total number records without any search
$sql = "SELECT app_id";
$sql.=" FROM applicants";
$query=mysqli_query($conn, $sql) or die("employee-grid-data1.php: get employees");
$totalData = mysqli_num_rows($query);
$totalFiltered = $totalData;  // when there is no search parameter then total number rows = total number filtered rows.


$sql = "SELECT app_id, fullname";
$sql.=" FROM applicants WHERE 1=1";
if( !empty($requestData['search']['value']) ) {   // if there is a search parameter, $requestData['search']['value'] contains search parameter
    $sql.=" AND ( app_id LIKE '".$requestData['search']['value']."%' ";    
    $sql.=" OR fullname LIKE '".$requestData['search']['value']."%' ";
    $sql.=" OR contact LIKE '".$requestData['search']['value']."%' ";
    $sql.=" OR address LIKE '".$requestData['search']['value']."%' ";
    $sql.=" OR photo LIKE '".$requestData['search']['value']."%' ";
    $sql.=" OR datereg LIKE '".$requestData['search']['value']."%' )";
}
$query=mysqli_query($conn, $sql) or die("employee-grid-data1.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']."   ";
/* $requestData['order'][0]['column'] contains colmun index, $requestData['order'][0]['dir'] contains order such as asc/desc  */    
$query=mysqli_query($conn, $sql) or die("employee-grid-data1.php: get employees");
$data = array();
while( $row=mysqli_fetch_array($query) ) {  // preparing an array
    $nestedData=array(); 
    $nestedData[] = $row["app_id"];
    $nestedData[] = $row["fullname"];

    $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

?>

问题：它是从第一个字母到最后一个字母的开始，而不是一个字一个字。可以逐字逐句吗？

source

Answer 1

这是由 Gyrocode.com 提供的解决方案

    // If there is a search parameter
if( !empty($requestData['search']['value']) ) {   
    $search = mysqli_real_escape_string(
       $conn,
       // Match beginning of word boundary
       "[[:<:]]".
       // Replace space characters with regular expression
       // to match one or more space characters in the target field
       implode("[[.space.]]+",             
          preg_split("/\s+/", 
             // Quote regular expression characters
             preg_quote(trim($requestData['search']['value']))
          )
       ).
       // Match end of word boundary
       "[[:>:]]"
    );


    $sql.=" AND ( app_id REGEXP '$search' ";    
    $sql.=" OR fullname REGEXP '$search' ";
    $sql.=" OR contact REGEXP '$search' ";
    $sql.=" OR address REGEXP '$search' ";
    $sql.=" OR photo REGEXP '$search' ";
    $sql.=" OR datereg REGEXP '$search' )";
}

Answer 2

您可以使用REGEXP 以及[[:<:]] 和[[:>:]] 单词边界标记来仅匹配单词。

例如：

SELECT *
FROM table 
WHERE keywords REGEXP '[[:<:]]word[[:>:]]'

您还需要使用mysqli_real_escape_string() 转义数据。

查看下面的更新代码：

// If there is a search parameter
if( !empty($requestData['search']['value']) ) {   
    $search = mysqli_real_escape_string(
       $conn,
       // Match beginning of word boundary
       "[[:<:]]".
       // Replace space characters with regular expression
       // to match one or more space characters in the target field
       implode("[[.space.]]+",             
          preg_split("/\s+/", 
             // Quote regular expression characters
             preg_quote(trim($requestData['search']['value']))
          )
       ).
       // Match end of word boundary
       "[[:>:]]"
    );


    $sql.=" AND ( app_id REGEXP '$search' ";    
    $sql.=" OR fullname REGEXP '$search' ";
    $sql.=" OR contact REGEXP '$search' ";
    $sql.=" OR address REGEXP '$search' ";
    $sql.=" OR photo REGEXP '$search' ";
    $sql.=" OR datereg REGEXP '$search' )";
}

您也可以考虑使用full-text search。

Answer 3

如果我理解正确 - 您指的是搜索是由搜索框中的 keyup 事件触发的。此 javascript 将允许用户输入一个单词，然后按 Enter 以执行搜索。

这需要添加到包含数据表初始化代码的同一个 js 文件中，并在初始化代码之后：

var oTable = $('#example').dataTable({
   ... yourdatatable init code

// unbind the keyup event that triggers the search 
$("#example_filter input").unbind();

// use fnFilter() to perform the search when the `Return` key is pressed
$("#example_filter input").keyup(function (e) {
     if (e.keyCode === 13) {
         oTable.fnFilter(this.value);
     }
});

这假定数据表 v1.9。如果您使用的是 1.10，则有一个 SO 答案 here 概述了修改

工作版本 -> https://jsfiddle.net/markps/HEDvf/3225/