提问人：Massimo D. N. 提问时间：3/24/2020 更新时间：3/24/2020 访问量：628
读取 mysql 表的 JSON 响应无效
Invalid JSON response reading mysql table
问：
我正在尝试学习使用服务器端数据库。我有一个mysql数据库，其中包含大约1000行的表。使用引导网格对每行进行加载、卸载、编辑和删除，结果很慢，所以我不想尝试服务器端。
我正在使用以下代码： index.html
<html lang = "it">
<head>
<title>Datatable Server Side Processing with PHP</title>
<meta charset = "utf-8">
<!-- DataTables CSS library -->
<link rel="stylesheet" type="text/css" href="DataTables/datatables.min.css"/>
<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!-- DataTables JS library -->
<script type="text/javascript" src="DataTables/datatables.min.js"></script>
<script>
$(document).ready(function(){
$('#memListTable').DataTable({
"processing": true,
"serverSide": true,
"ajax": "getData.php"
});
});
</script>
<style>
.container {padding: 20px;}
</style>
</head>
<body>
<div class = "container">
<table id="memListTable" class="display" style="width:100%">
<thead>
<tr>
<th>ID</th>
<th>Codice</th>
<th>Codice Fornitore</th>
<th>Ubicazione</th>
<th>Descrizione</th>
<th>Package</th>
<th>Quantità</th>
</tr>
</thead>
<tfoot>
<tr>
<th>ID</th>
<th>Codice</th>
<th>Codice Fornitore</th>
<th>Ubicazione</th>
<th>Descrizione</th>
<th>Package</th>
<th>Quantità</th>
</tr>
</tfoot>
</table>
</div>
</body>
</html>
getData.php
<?php
// Database connection info
$dbDetails = array(
'host' => 'localhost',
'user' => 'root',
'pass' => '',
'db' => 'company',
'port' => '3308' // aggiunto
);
// DB table to use
$table = 'maglab';
// Table's primary key
$primaryKey = 'id';
// Array of database columns which should be read and sent back to DataTables.
// The `db` parameter represents the column name in the database.
// The `dt` parameter represents the DataTables column identifier.
$columns = array(
array( 'db' => 'id', 'dt' => 0 ),
array( 'db' => 'codice', 'dt' => 1 ),
array( 'db' => 'cod_forn', 'dt' => 2 ),
array( 'db' => 'ubicazione', 'dt' => 3 ),
array( 'db' => 'descrizione', 'dt' => 4 ),
array( 'db' => 'package', 'dt' => 5 ),
array( 'db' => 'quantita', 'dt' => 6 )
);
// Include SQL query processing class
require( 'ssp.class.php' );
// Output data as json format
echo json_encode(
SSP::simple( $_GET, $dbDetails, $table, $primaryKey, $columns )
);
?>
ssp.class.php
<?php
/*
* Helper functions for building a DataTables server-side processing SQL query
*
* The static functions in this class are just helper functions to help build
* the SQL used in the DataTables demo server-side processing scripts. These
* functions obviously do not represent all that can be done with server-side
* processing, they are intentionally simple to show how it works. More complex
* server-side processing operations will likely require a custom script.
*
* See http://datatables.net/usage/server-side for full details on the server-
* side processing requirements of DataTables.
*
* @license MIT - http://datatables.net/license_mit
*/
// Please Remove below 4 lines as this is use in Datatatables test environment for your local or live environment please remove it or else it will not work
$file = $_SERVER['DOCUMENT_ROOT'].'/datatables/pdo.php';
if ( is_file( $file ) ) {
include( $file );
}
class SSP {
/**
* Create the data output array for the DataTables rows
*
* @param array $columns Column information array
* @param array $data Data from the SQL get
* @return array Formatted data in a row based format
*/
static function data_output ( $columns, $data )
{
$out = array();
for ( $i=0, $ien=count($data) ; $i<$ien ; $i++ ) {
$row = array();
for ( $j=0, $jen=count($columns) ; $j<$jen ; $j++ ) {
$column = $columns[$j];
// Is there a formatter?
if ( isset( $column['formatter'] ) ) {
if(empty($column['db'])){
$row[ $column['dt'] ] = $column['formatter']( $data[$i] );
}
else{
$row[ $column['dt'] ] = $column['formatter']( $data[$i][ $column['db'] ], $data[$i] );
}
}
else {
if(!empty($column['db'])){
$row[ $column['dt'] ] = $data[$i][ $columns[$j]['db'] ];
}
else{
$row[ $column['dt'] ] = "";
}
}
}
$out[] = $row;
}
return $out;
}
/**
* Database connection
*
* Obtain an PHP PDO connection from a connection details array
*
* @param array $conn SQL connection details. The array should have
* the following properties
* * host - host name
* * db - database name
* * user - user name
* * pass - user password
* @return resource PDO connection
*/
static function db ( $conn )
{
if ( is_array( $conn ) ) {
return self::sql_connect( $conn );
}
return $conn;
}
/**
* Paging
*
* Construct the LIMIT clause for server-side processing SQL query
*
* @param array $request Data sent to server by DataTables
* @param array $columns Column information array
* @return string SQL limit clause
*/
static function limit ( $request, $columns )
{
$limit = '';
if ( isset($request['start']) && $request['length'] != -1 ) {
$limit = "LIMIT ".intval($request['start']).", ".intval($request['length']);
}
return $limit;
}
/**
* Ordering
*
* Construct the ORDER BY clause for server-side processing SQL query
*
* @param array $request Data sent to server by DataTables
* @param array $columns Column information array
* @return string SQL order by clause
*/
static function order ( $request, $columns )
{
$order = '';
if ( isset($request['order']) && count($request['order']) ) {
$orderBy = array();
$dtColumns = self::pluck( $columns, 'dt' );
for ( $i=0, $ien=count($request['order']) ; $i<$ien ; $i++ ) {
// Convert the column index into the column data property
$columnIdx = intval($request['order'][$i]['column']);
$requestColumn = $request['columns'][$columnIdx];
$columnIdx = array_search( $requestColumn['data'], $dtColumns );
$column = $columns[ $columnIdx ];
if ( $requestColumn['orderable'] == 'true' ) {
$dir = $request['order'][$i]['dir'] === 'asc' ?
'ASC' :
'DESC';
$orderBy[] = '`'.$column['db'].'` '.$dir;
}
}
if ( count( $orderBy ) ) {
$order = 'ORDER BY '.implode(', ', $orderBy);
}
}
return $order;
}
/**
* Searching / Filtering
*
* Construct the WHERE clause for server-side processing SQL query.
*
* NOTE this does not match the built-in DataTables filtering which does it
* word by word on any field. It's possible to do here performance on large
* databases would be very poor
*
* @param array $request Data sent to server by DataTables
* @param array $columns Column information array
* @param array $bindings Array of values for PDO bindings, used in the
* sql_exec() function
* @return string SQL where clause
*/
static function filter ( $request, $columns, &$bindings )
{
$globalSearch = array();
$columnSearch = array();
$dtColumns = self::pluck( $columns, 'dt' );
if ( isset($request['search']) && $request['search']['value'] != '' ) {
$str = $request['search']['value'];
for ( $i=0, $ien=count($request['columns']) ; $i<$ien ; $i++ ) {
$requestColumn = $request['columns'][$i];
$columnIdx = array_search( $requestColumn['data'], $dtColumns );
$column = $columns[ $columnIdx ];
if ( $requestColumn['searchable'] == 'true' ) {
if(!empty($column['db'])){
$binding = self::bind( $bindings, '%'.$str.'%', PDO::PARAM_STR );
$globalSearch[] = "`".$column['db']."` LIKE ".$binding;
}
}
}
}
// Individual column filtering
if ( isset( $request['columns'] ) ) {
for ( $i=0, $ien=count($request['columns']) ; $i<$ien ; $i++ ) {
$requestColumn = $request['columns'][$i];
$columnIdx = array_search( $requestColumn['data'], $dtColumns );
$column = $columns[ $columnIdx ];
$str = $requestColumn['search']['value'];
if ( $requestColumn['searchable'] == 'true' &&
$str != '' ) {
if(!empty($column['db'])){
$binding = self::bind( $bindings, '%'.$str.'%', PDO::PARAM_STR );
$columnSearch[] = "`".$column['db']."` LIKE ".$binding;
}
}
}
}
// Combine the filters into a single string
$where = '';
if ( count( $globalSearch ) ) {
$where = '('.implode(' OR ', $globalSearch).')';
}
if ( count( $columnSearch ) ) {
$where = $where === '' ?
implode(' AND ', $columnSearch) :
$where .' AND '. implode(' AND ', $columnSearch);
}
if ( $where !== '' ) {
$where = 'WHERE '.$where;
}
return $where;
}
/**
* Perform the SQL queries needed for an server-side processing requested,
* utilising the helper functions of this class, limit(), order() and
* filter() among others. The returned array is ready to be encoded as JSON
* in response to an SSP request, or can be modified if needed before
* sending back to the client.
*
* @param array $request Data sent to server by DataTables
* @param array|PDO $conn PDO connection resource or connection parameters array
* @param string $table SQL table to query
* @param string $primaryKey Primary key of the table
* @param array $columns Column information array
* @return array Server-side processing response array
*/
static function simple ( $request, $conn, $table, $primaryKey, $columns )
{
$bindings = array();
$db = self::db( $conn );
// Build the SQL query string from the request
$limit = self::limit( $request, $columns );
$order = self::order( $request, $columns );
$where = self::filter( $request, $columns, $bindings );
// Main query to actually get the data
$data = self::sql_exec( $db, $bindings,
"SELECT `".implode("`, `", self::pluck($columns, 'db'))."`
FROM `$table`
$where
$order
$limit"
);
// Data set length after filtering
$resFilterLength = self::sql_exec( $db, $bindings,
"SELECT COUNT(`{$primaryKey}`)
FROM `$table`
$where"
);
$recordsFiltered = $resFilterLength[0][0];
// Total data set length
$resTotalLength = self::sql_exec( $db,
"SELECT COUNT(`{$primaryKey}`)
FROM `$table`"
);
$recordsTotal = $resTotalLength[0][0];
/*
* Output
*/
return array(
"draw" => isset ( $request['draw'] ) ?
intval( $request['draw'] ) :
0,
"recordsTotal" => intval( $recordsTotal ),
"recordsFiltered" => intval( $recordsFiltered ),
"data" => self::data_output( $columns, $data )
);
}
/**
* The difference between this method and the `simple` one, is that you can
* apply additional `where` conditions to the SQL queries. These can be in
* one of two forms:
*
* * 'Result condition' - This is applied to the result set, but not the
* overall paging information query - i.e. it will not effect the number
* of records that a user sees they can have access to. This should be
* used when you want apply a filtering condition that the user has sent.
* * 'All condition' - This is applied to all queries that are made and
* reduces the number of records that the user can access. This should be
* used in conditions where you don't want the user to ever have access to
* particular records (for example, restricting by a login id).
*
* @param array $request Data sent to server by DataTables
* @param array|PDO $conn PDO connection resource or connection parameters array
* @param string $table SQL table to query
* @param string $primaryKey Primary key of the table
* @param array $columns Column information array
* @param string $whereResult WHERE condition to apply to the result set
* @param string $whereAll WHERE condition to apply to all queries
* @return array Server-side processing response array
*/
static function complex ( $request, $conn, $table, $primaryKey, $columns, $whereResult=null, $whereAll=null )
{
$bindings = array();
$db = self::db( $conn );
$localWhereResult = array();
$localWhereAll = array();
$whereAllSql = '';
// Build the SQL query string from the request
$limit = self::limit( $request, $columns );
$order = self::order( $request, $columns );
$where = self::filter( $request, $columns, $bindings );
$whereResult = self::_flatten( $whereResult );
$whereAll = self::_flatten( $whereAll );
if ( $whereResult ) {
$where = $where ?
$where .' AND '.$whereResult :
'WHERE '.$whereResult;
}
if ( $whereAll ) {
$where = $where ?
$where .' AND '.$whereAll :
'WHERE '.$whereAll;
$whereAllSql = 'WHERE '.$whereAll;
}
// Main query to actually get the data
$data = self::sql_exec( $db, $bindings,
"SELECT `".implode("`, `", self::pluck($columns, 'db'))."`
FROM `$table`
$where
$order
$limit"
);
// Data set length after filtering
$resFilterLength = self::sql_exec( $db, $bindings,
"SELECT COUNT(`{$primaryKey}`)
FROM `$table`
$where"
);
$recordsFiltered = $resFilterLength[0][0];
// Total data set length
$resTotalLength = self::sql_exec( $db, $bindings,
"SELECT COUNT(`{$primaryKey}`)
FROM `$table` ".
$whereAllSql
);
$recordsTotal = $resTotalLength[0][0];
/*
* Output
*/
return array(
"draw" => isset ( $request['draw'] ) ?
intval( $request['draw'] ) :
0,
"recordsTotal" => intval( $recordsTotal ),
"recordsFiltered" => intval( $recordsFiltered ),
"data" => self::data_output( $columns, $data )
);
}
/**
* Connect to the database
*
* @param array $sql_details SQL server connection details array, with the
* properties:
* * host - host name
* * db - database name
* * user - user name
* * pass - user password
* @return resource Database connection handle
*/
static function sql_connect ( $sql_details )
{
try {
$db = @new PDO(
"mysql:host={$sql_details['host']};dbname={$sql_details['db']};port={$sql_details['port']}",
$sql_details['user'],
$sql_details['pass'],
array( PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION )
);
}
catch (PDOException $e) {
self::fatal(
"An error occurred while connecting to the database. ".
"The error reported by the server was: ".$e->getMessage()
);
}
return $db;
}
/**
* Execute an SQL query on the database
*
* @param resource $db Database handler
* @param array $bindings Array of PDO binding values from bind() to be
* used for safely escaping strings. Note that this can be given as the
* SQL query string if no bindings are required.
* @param string $sql SQL query to execute.
* @return array Result from the query (all rows)
*/
static function sql_exec ( $db, $bindings, $sql=null )
{
// Argument shifting
if ( $sql === null ) {
$sql = $bindings;
}
$stmt = $db->prepare( $sql );
//echo $sql;
// Bind parameters
if ( is_array( $bindings ) ) {
for ( $i=0, $ien=count($bindings) ; $i<$ien ; $i++ ) {
$binding = $bindings[$i];
$stmt->bindValue( $binding['key'], $binding['val'], $binding['type'] );
}
}
// Execute
try {
$stmt->execute();
}
catch (PDOException $e) {
self::fatal( "An SQL error occurred: ".$e->getMessage() );
}
// Return all
return $stmt->fetchAll( PDO::FETCH_BOTH );
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Internal methods
*/
/**
* Throw a fatal error.
*
* This writes out an error message in a JSON string which DataTables will
* see and show to the user in the browser.
*
* @param string $msg Message to send to the client
*/
static function fatal ( $msg )
{
echo json_encode( array(
"error" => $msg
) );
exit(0);
}
/**
* Create a PDO binding key which can be used for escaping variables safely
* when executing a query with sql_exec()
*
* @param array &$a Array of bindings
* @param * $val Value to bind
* @param int $type PDO field type
* @return string Bound key to be used in the SQL where this parameter
* would be used.
*/
static function bind ( &$a, $val, $type )
{
$key = ':binding_'.count( $a );
$a[] = array(
'key' => $key,
'val' => $val,
'type' => $type
);
return $key;
}
/**
* Pull a particular property from each assoc. array in a numeric array,
* returning and array of the property values from each item.
*
* @param array $a Array to get data from
* @param string $prop Property to read
* @return array Array of property values
*/
static function pluck ( $a, $prop )
{
$out = array();
for ( $i=0, $len=count($a) ; $i<$len ; $i++ ) {
if(empty($a[$i][$prop])){
continue;
}
//removing the $out array index confuses the filter method in doing proper binding,
//adding it ensures that the array data are mapped correctly
$out[$i] = $a[$i][$prop];
}
return $out;
}
/**
* Return a string from an array or a string
*
* @param array|string $a Array to join
* @param string $join Glue for the concatenation
* @return string Joined string
*/
static function _flatten ( $a, $join = ' AND ' )
{
if ( ! $a ) {
return '';
}
else if ( $a && is_array($a) ) {
return implode( $join, $a );
}
return $a;
}
}
?>
现在运行index.php我收到 DataTables 警告：table id=memListTable - 无效的 JSON 响应 在Firefox上，在XHR>执行Web Developer>网络时，我看到以下Json文件
{"draw":1,"recordsTotal":907,"recordsFiltered":907,"data":[["1","CONN 4 POLI"," prova","C4"," Connettore 4 poli maschio stampato ","conn","1865"],["2","PE140-VIPER17",null,"A2","Off Line Converter","SMD","12"],["3","0003-XU-FAN7382008XSOPCP","FAN7382MX ","A2","Driver di porta Half Bridge Gate Dvr ","SOP-8","10"],["4","0004-XQ-0A20040XNPSOT2BJ","BC847BLT1G ","A2","Transistor bipolari - BJT 100mA 50V NPN VBE min 580mV ","SOT23-3","100"],["5","PE140-SFH6106",null,"A2","Phototransistor out","SMD","7"],["6","0006-XQ-40A00k6XXNDPAKIG","STGB19NC60HDT4 ","A2","Transistori IGBT N Ch 600V 19A ","D2PAK-3","273"],["7","PE140-BZX84C10V",null,"A2","Diodo Zener 9.4-10.6V 250mW","SMD","100"],["8","PE140-BAT54S",null,"A2","Schottky 30V Dual BAT54","SOT-323","4"],["10","000A-XD-1A501K0XXSDO21RF","US2MA ","A2","Raddrizzatori HER SMA GPPN 1.5A 600V ","DO-214AC-2","120"],["11","PE140-MMBD914",null,"A2","Diodo 100V","SMD","10"]]}
由于错误消息，网格为空。我不明白为什么表格是 907 行，我们可以在 Json “recordsTotal”：907，“recordsFiltered”：907 上看到它，但 json 只有 10 个随机行
答： 暂无答案
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