laravel框架中超实用的功能介绍

composer require symfony/var-dumper

    public function index()
    {
        DB::connection()->enableQueryLog(); // 开启查询日志
        
        DB::table('posts')->paginate(5);  //要查看的sql

        $queries = DB::getQueryLog(); // 获取查询日志

        dd($queries); // 即可查看执行的sql，执行的时间，传入的参数等等
    }

DB::table('posts')->toSql();

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use DB;
use Log;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        //
        // 新增代码
        DB::listen(function ($query) {
            Log::info(
                $query->sql,
                $query->bindings,
                $query->time
            );
        });
    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }
}

Issue::saving(function(Issue $issue){
    if ($issue->isDirty('title')) {
        $user = Auth::user()->username;
        $oldTitle = $issue->getOriginal('title'); // 原始值
        $newTitle = $issue->title;                // 新值
        ActionLog::log("$user 把标题 $oldTitle 修改为 $newTitle");
    }
});