php - 在 DataTables 服务器端处理脚本中运行 MySQL 查询

Question

我正在使用 DataTables server-side processing将数据从 MySQL 表提取到 DataTables 表中。

这是我想要运行并显示在我的 DataTables 表中的有效 MySQL 查询:

$sql = "SELECT Client,EstimateNumber,Status,TotalEstimatedTime,CostToDateRoleTotal,ROUND((CostToDateRoleTotal/TotalEstimatedTime)*100) as PercentComplete FROM Estimates WHERE " . ($studioName != null ? "Studio = '" . $studioName. "' AND" : '') . " Status != 'Invoiced' AND Status != 'Cancelled' AND TotalEstimatedTime > 0 AND CostToDateRoleTotal > 0 ORDER BY PercentComplete DESC";

我已经将DataTables服务器端处理脚本调整为:

<?php

// connection configuration
require_once 'config.php';

// db table to use
$table = 'Estimates';

// table's primary key
$primaryKey = 'EstimateNumber';

$percent_complete = "('CostToDateRoleTotal'/'TotalEstimatedTime')*100";

// array of database columns which should be read and sent back to DataTables.
// the 'db' parameter represents the column name in the database, while the 'dt'
// parameter represents the DataTables column identifier.
$columns = array(
array('db' => 'Client', 'dt' => 0),
array('db' => 'EstimateNumber', 'dt' => 1),
array('db' => 'Status', 'dt' => 2),
array('db' => 'TotalEstimatedTime', 'dt' => 3),
array('db' => 'CostToDateRoleTotal', 'dt' => 4),
array('db' => $percent_complete, 'dt' => 4),
); // end columns array

// sql server connection information
$sql_details = array(
'user' => $currentConfig['user'],
'pass' => $currentConfig['pass'],
'db' => $currentConfig['name'],
'host' => $currentConfig['host'],
);

// DataTables helper class
require 'ssp.class.php';

function utf8ize($d) {
if (is_array($d)) {
    foreach ($d as $k => $v) {
        $d[$k] = utf8ize($v);
    }
} else if (is_string ($d)) {
    return utf8_encode($d);
}
return $d;
}


$data = SSP::complex($_GET, $sql_details, $table, $primaryKey, $columns, null, "Status != 'Invoiced' AND Status != 'Cancelled' AND TotalEstimatedTime > 0 AND CostToDateRoleTotal > 0");

echo json_encode(utf8ize($data));

这一行抛出一个错误:

$percent_complete = "('CostToDateRoleTotal'/'TotalEstimatedTime')*100";

错误是:{“error”:“发生 SQL 错误:SQLSTATE[42S22]:找不到列:1054 Unknown column '('CostToDateRoleTotal'/'TotalEstimatedTime')*100' in 'field list'”}

在我上面的原始 $sql 查询中，我运行了这个计算并将结果显示为一个新列 $percent_complete。我试图在我的 DataTables 表中显示相同的结果。如何更改我的服务器端处理脚本以执行此计算并将其显示在新列中？

Answer 1

原因

ssp.class.php 中定义的类 SSP 无法处理列别名、表达式或 JOIN。

解决方案

您需要更改 ssp.class.php 并删除所有转义列名和表名的 `(反引号)字符。如果名称是保留字，您将负责自己转义列/表名称。

然后替换

array('db' => $percent_complete, 'dt' => 4)

与

array('db' => 'ROUND((CostToDateRoleTotal/TotalEstimatedTime)*100)', 'dt' => 4)