Laravel5.* 打印出执行的sql语句

打开app\Providers\AppServiceProvider.php，在boot方法中添加如下内容

5.2以下版本

// 先引入DB 
use DB;
// 或者直接使用 \DB::
 DB::listen(function($sql, $bindings, $time) {
                dump($sql);
            });

5.2及以上版本

use DB;
// 或者直接使用 \DB::
// 只能接受一个参数

QueryExecuted {#84 ▼
  +sql: "select * from `posts` where `slug` = ? limit 1"
  +bindings: array:1 [▶]
  +time: 0.59
  +connection: MySqlConnection {#85 ▶}
  +connectionName: "mysql"
}

 DB::listen(function($sql) {
                dump($sql);
                // echo $sql->sql;
                // dump($sql->bindings);
            });

// 如果要放入日志文件中
DB::listen(
    function ($sql) {
        // $sql is an object with the properties:
        //  sql: The query
        //  bindings: the sql query variables
        //  time: The execution time for the query
        //  connectionName: The name of the connection

        // To save the executed queries to file:
        // Process the sql and the bindings:
        foreach ($sql->bindings as $i => $binding) {
            if ($binding instanceof \DateTime) {
                $sql->bindings[$i] = $binding->format('\'Y-m-d H:i:s\'');
            } else {
                if (is_string($binding)) {
                    $sql->bindings[$i] = "'$binding'";
                }
            }
        }

        // Insert bindings into query
        $query = str_replace(array('%', '?'), array('%%', '%s'), $sql->sql);

        $query = vsprintf($query, $sql->bindings);

        // Save the query to file
        $logFile = fopen(
            storage_path('logs' . DIRECTORY_SEPARATOR . date('Y-m-d') . '_query.log'),
            'a+'
        );
        fwrite($logFile, date('Y-m-d H:i:s') . ': ' . $query . PHP_EOL);
        fclose($logFile);
    }
);