<?php
namespace App\Models;

use DB;
use Illuminate\Database\Eloquent\Model;

/**
 * 学生表模型
 */
class Students extends Model
{
 protected $table = 'students';

 //批量更新
 public function updateBatch($multipleData = [])
 {
  try {
   if (empty($multipleData)) {
    throw new \Exception("数据不能为空");
   }
   $tableName = DB::getTablePrefix() . $this->getTable(); // 表名
   $firstRow = current($multipleData);

   $updateColumn = array_keys($firstRow);
   // 默认以id为条件更新，如果没有ID则以第一个字段为条件
   $referenceColumn = isset($firstRow['id']) ? 'id' : current($updateColumn);
   unset($updateColumn[0]);
   // 拼接sql语句
   $updateSql = "UPDATE " . $tableName . " SET ";
   $sets  = [];
   $bindings = [];
   foreach ($updateColumn as $uColumn) {
    $setSql = "`" . $uColumn . "` = CASE ";
    foreach ($multipleData as $data) {
     $setSql .= "WHEN `" . $referenceColumn . "` = ? THEN ? ";
     $bindings[] = $data[$referenceColumn];
     $bindings[] = $data[$uColumn];
    }
    $setSql .= "ELSE `" . $uColumn . "` END ";
    $sets[] = $setSql;
   }
   $updateSql .= implode(', ', $sets);
   $whereIn = collect($multipleData)->pluck($referenceColumn)->values()->all();
   $bindings = array_merge($bindings, $whereIn);
   $whereIn = rtrim(str_repeat('?,', count($whereIn)), ',');
   $updateSql = rtrim($updateSql, ", ") . " WHERE `" . $referenceColumn . "` IN (" . $whereIn . ")";
   // 传入预处理sql语句和对应绑定数据
   return DB::update($updateSql, $bindings);
  } catch (\Exception $e) {
   return false;
  }
 }
}