YII2框架中日志的配置与使用方法实例分析

return [
	//log必须在bootstrap期间就被加载，便于及时调度日志消息到目标
	'bootstrap' => ['log'],

	'components' => [
		'log' => [
			//消息跟踪级别，设置yii\log\Dispatcher::traceLevel属性
			//YII_DEBUG开启时，日志消息被记录时，追加最多3个调用堆栈信息
			'traceLevel' => YII_DEBUG &＃63; 3 : 0,
			//日志目标，可定义多个
			'targets' => [
				[
					//日志处理器类
					'class' => 'yii\log\FileTarget',
					//日志记录的级别
					'levels' => ['error', 'warning'],
					//定义日志文件
					'logFile' => '@runtime/logs/test.log',
				],
			],
		],
	],
];

//跟踪
Yii::trace('我是一条跟踪');
//消息
YII::info('我是一条消息');
//调试
YII::debug('我是一条调试');
//警告
YII::warning('我是一条警告');
//错误
YII::error('我是一条错误');

'log' => [
	'traceLevel' => YII_DEBUG &＃63; 3 : 0,
	'targets' => [
		[
			//日志处理器类，这里我改用数据库存日志了
			'class' => 'yii\log\DbTarget',
			//日志记录的级别
			'levels' => ['error', 'warning'],
			//追加上下文信息，默认YII会包含PHP全局变量，这里我们不需要，设为空。
			'logVars' => [],
			//定义分类
			'categories' => ['db'],
		],
		[
			//日志处理器类，这里我改用数据库存日志了
			'class' => 'yii\log\DbTarget',
			//日志记录的级别
			'levels' => ['error', 'warning'],
			//追加上下文信息，默认YII会包含PHP全局变量，这里我们不需要，设为空。
			'logVars' => [],
			//定义分类
			'categories' => ['pay'],
		],
	],
],

//警告
YII::warning('我是一条数据库警告', 'db');
//错误
YII::error('我是一条数据库错误', 'db');

//警告
YII::warning('我是一条支付警告', 'pay');
//错误
YII::error('我是一条支付错误', 'pay');

yii migrate --migratiOnPath=@yii/log/migrations

'log' => [
	'traceLevel' => YII_DEBUG &＃63; 3 : 0,
	'targets' => [
		[
			'class' => 'yii\log\FileTarget',
			'levels' => ['error', 'warning'],
		],
		[
			//日志处理器类，这里我改用数据库存日志了
			'class' => 'yii\log\DbTarget',
			//日志记录的级别，这里演示设为info
			'levels' => ['info'],
			//定义分类
			'categories' => ['yii\db\*'],
		],
	],
],

<&＃63;php

namespace app\controllers;

use YII;
use yii\db\Query;
use yii\web\Controller;

class TestController extends Controller
{
  public function actionTest()
  {
    $data = (new Query())->from('{{%user}}')
      ->where('id=:id', [':id' => '1'])
      ->all();

    var_dump($data);
  }
}

'log' => [
	'traceLevel' => YII_DEBUG &＃63; 3 : 0,
	'targets' => [
		[
			'class' => 'yii\log\FileTarget',
			'levels' => ['error', 'warning'],
		],
		[
			//日志处理器类，这里我改用数据库存日志了
			'class' => 'yii\log\DbTarget',
			'levels' => ['error', 'warning'],
			//定义分类
			'categories' => ['db'],
			//定义前缀
			'prefix' => function($message) {
				$uid = !empty(YII::$app->user->id) &＃63; YII::$app->user->id : '-';
				$mid = !empty(YII::$app->module->id) &＃63; YII::$app->module->id : '-';
				$cid = !empty(YII::$app->controller->id) &＃63; YII::$app->controller->id : '-';
				$aid = !empty(YII::$app->controller->action->id) &＃63; YII::$app->controller->action->id : '-';
				return "[{$uid}][{$mid}/{$cid}/{$aid}]";
			},
		],
	],
],

YII::warning('我是警告!!!', 'db');
YII::error('我是错误!!!', 'db');

'log' => [
	'traceLevel' => YII_DEBUG &＃63; 3 : 0,
	//消息被存放在一个数组里，积累到一定数量，才会被刷新到日志target
	//通过flushInterval设置消息刷新到日志target的数量
	'flushInterval' => 100,
	'targets' => [
		[
			'class' => 'yii\log\FileTarget',
			'levels' => ['error', 'warning'],
		],
		[
			//日志处理器类，这里我改用数据库存日志了
			'class' => 'yii\log\DbTarget',
			//当消息刷新到日志对象时，并不会立即导出，只有累积到一定数量才会导出
			//通过exportInterval来设置这个导出数量
			'exportInterval' => 100,
			'levels' => ['error', 'warning'],
			//定义分类
			'categories' => ['db'],
		],
	],
],

'log' => [
	'traceLevel' => YII_DEBUG &＃63; 3 : 0,
	'flushInterval' => 1,
	'targets' => [
		[
			'class' => 'yii\log\FileTarget',
			'levels' => ['error', 'warning'],
		],
		[
			'class' => 'yii\log\FileTarget',
			'exportInterval' => 1,
			'levels' => ['error', 'warning'],
			//定义分类
			'categories' => ['db'],
		],
	],
],

'log' => [
	'traceLevel' => YII_DEBUG &＃63; 3 : 0,
	'targets' => [
		'pay' => [
			'class' => 'yii\log\DbTarget',
			'levels' => ['error', 'warning'],
			'categories' => ['pay'],
		],
		'db' => [
			'class' => 'yii\log\DbTarget',
			'levels' => ['error', 'warning'],
			'categories' => ['db'],
		],
	],
],

//关闭
Yii::$app->log->targets['db']->enabled = false;
//开启
Yii::$app->log->targets['db']->enabled = true;