一：在配置檔案的log元件中配置DbTarget

'log' => [
 'traceLevel' => YII_DEBUG ? 3 : 0,'targets' => [
  [
   'class' => 'yii\log\FileTarget','levels' => ['error','warning'],],'test' => [
   'class' => 'yii\log\DbTarget',//DaTarget類
   'logTable' => '{{%test_log}}',//日誌表
   'levels' => ['error','info',//日誌等級
  ],

二：生成日誌表

在專案目錄下執行如下命令生成日誌表

php yii migrate --migrationPath=@yii/log/migrations/

三：使用日誌

在需要使用日誌的地方使用

Yii::info()

四：自定義DbTarget日誌

1：首先建立一個自定義的日誌表

(1)在專案目錄下執行

php yii migrate/create create_test_log

(2)：在建立的migrate檔案下編寫建立資料庫的遷移指令碼

<?php
use yii\db\Migration;
/**
 * Class m200720_091126_create_test_log
 */
class m200720_091126_create_test_log extends Migration
{
 /**
  * {@inheritdoc}
  */
 public function safeUp()
 {
  $this->createTable('{{%test_log}}',[
   'id' => $this->bigPrimaryKey(),'level' => $this->integer()->notNull()->comment('日誌等級'),'category' => $this->string(100)->notNull()->comment('分類名稱'),'prefix' => $this->text(),'route' => $this->string(100)->notNull()->comment('路由'),'method' => $this->string(20)->notNull()->comment('請求方式'),'app' => $this->string(20)->comment('請求應用'),'module' => $this->string(20)->comment('請求模組'),'request' => $this->text()->comment('請求引數'),'status' => $this->string(10)->notNull()->comment('狀態碼'),'message' => $this->text()->comment('日誌內容'),'request_at' => $this->double()->notNull()->comment('請求時間'),'ip' => $this->string(63)->comment('請求IP'),'CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci ENGINE=InnoDB COMMENT=\'請求日誌表\'');
  //增加索引
  $this->createIndex('idx_log_level','{{%test_log}}','level');
  $this->createIndex('idx_log_category','category');
  $this->createIndex('idx_log_route','route');
  $this->createIndex('idx_log_method','method');
  $this->createIndex('idx_log_status','status');
 }
 /**
  * @inheritdoc
  */
 public function safeDown()
 {
  $this->dropTable('{{%test_log}}');
 }
}

(3)：執行如下命令生成DbTarget日誌表

php yii migrate

2：編寫一個DbTarget類來繼承yiilogDbTarget類

<?php
namespace app\components;
use Yii;
use yii\helpers\VarDumper;
use yii\log\LogRuntimeException;
use yii\web\HttpException;
use yii\web\Request;
/**
 * DbTarget stores log messages in a database table.
 *
 * @see yii\log\DbTarget
 *
 * @author wangjian
 * @since 1.0
 */
class DbTarget extends \yii\log\DbTarget
{
 /**
  * @inheritdoc
  */
 public $categories = [
  'application','yii\web\HttpException:*',];
 /**
  * @inheritdoc
  */
 public $except = [
  // 'yii\web\HttpException:404',];
 /**
  * @inheritdoc
  */
 public $logVars = ['_GET','_POST'];
 /**
  * @var string 使用者元件ID
  */
 public $userComponentId = 'user';
 /**
  * @inheritdoc
  */
 public function collect($messages,$final)
 {
  $this->messages = array_merge($this->messages,static::filterMessages($messages,$this->getLevels(),$this->categories,$this->except));
  $count = count($this->messages);
  if ($count > 0 && ($final || $this->exportInterval > 0 && $count >= $this->exportInterval)) {
   $oldExportInterval = $this->exportInterval;
   $this->exportInterval = 0;
   $this->export();
   $this->exportInterval = $oldExportInterval;
   $this->messages = [];
  }
 }
 /**
  * @inheritdoc
  */
 public function getMessagePrefix($message)
 {
  if ($this->prefix !== null) {
   return call_user_func($this->prefix,$message);
  }
  if (Yii::$app === null) {
   return '';
  }
  $ip = $this->getIp();
  $ip = empty($ip) ? '-' : $ip;
  return "[$ip]";
 }
 /**
  * @inheritdoc
  */
 public function export()
 {
  if ($this->db->getTransaction()) {
   $this->db = clone $this->db;
  }
  $tableName = $this->db->quoteTableName($this->logTable);
  $sql = "INSERT INTO $tableName ([[level]],[[category]],[[prefix]],[[route]],[[method]],[[app]],[[module]],[[request]],[[status]],[[message]],[[request_at]],[[ip]])
    VALUES (:level,:category,:prefix,:route,:method,:app,:module,:request,:status,:message,:request_at,:ip)";
  $command = $this->db->createCommand($sql);
  $request = Yii::$app->getRequest();
  list($route,$params) = $request->resolve();
  $method = $request->getMethod();
  $module = Yii::$app->controller->module->id;
  $route = str_replace("{$module}/",'',$route);
  foreach ($this->messages as $message) {
   list($text,$level,$category,$timestamp) = $message;
   $statusCode = 200;
   if (!is_string($text)) {
    if ($text instanceof \Throwable || $text instanceof \Exception) {
     $statusCode = $text instanceof HttpException ? $text->statusCode : 500;
     $text = $text->getMessage();
    } else {
     $text = VarDumper::export($text);
    }
   }
   if ($command->bindValues([
     ':level' => $level,':category' => $category,':prefix' => $this->getMessagePrefix($message),':route' => $route,':method' => $method,':app' => Yii::$app->id,':module' => $module,':request' => $this->getContextMessage(),':status' => $statusCode,':message' => $text,':request_at' => $timestamp,':ip' => $this->getIp(),])->execute() > 0) {
    continue;
   }
   throw new LogRuntimeException('Unable to export log through database!');
  }
 }
 /**
  * 獲取當前IP
  */
 protected function getIp()
 {
  $request = Yii::$app->getRequest();
  return $request instanceof Request ? $request->getUserIP() : '';
 }
}

3：在配置檔案中將yiilogDbTarget類改成我們自定義的類

'log' => [
 'traceLevel' => YII_DEBUG ? 3 : 0,'test' => [
   'class' => 'app\components\DbTarget','logTable' => '{{%test_log}}',

4：使用DbTarget日誌

同樣的使用Yii::info來記錄日誌

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