从laravel 5.2开始。您可以使用DB:：listen获取执行的查询。

DB::listen(function ($query) {
    // $query->sql
    // $query->bindings
    // $query->time
});

或者，如果要调试单个Builder实例，则可以使用toSql方法。

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

如果你使用laravel 5.1和MySQL，你可以使用我制作的这个函数：

/*
 *  returns SQL with values in it
 */
function getSql($model)
{
    $replace = function ($sql, $bindings)
    {
        $needle = '?';
        foreach ($bindings as $replace){
            $pos = strpos($sql, $needle);
            if ($pos !== false) {
                if (gettype($replace) === "string") {
                     $replace = ' "'.addslashes($replace).'" ';
                }
                $sql = substr_replace($sql, $replace, $pos, strlen($needle));
            }
        }
        return $sql;
    };
    $sql = $replace($model->toSql(), $model->getBindings());
    
    return $sql;
}

作为输入参数，可以使用以下任一项

照明\数据库\口才\生成器照亮\数据库\口才\关系\ HasMany照明\数据库\查询\生成器

我的方法是基于日志视图，只需修改app/Providers/AppServiceProvider.php文件：

将此代码添加到app/Provider/AppServiceProvider.php中

/**
 * Bootstrap any application services.
 *
 * @return void
 */
public function boot()
{
    //
    DB::listen(function ($query) {
        $querySql = str_replace(['?'], ['\'%s\''], $query->sql);
        $queryRawSql = vsprintf($querySql, $query->bindings);
        Log::debug('[SQL EXEC]', [
                "raw sql"  => $queryRawSql,
                "time" => $query->time,
            ]
        );
    });
}

我的sql句柄代码：

$users = DB::table('users')
    ->select(DB::raw('count(*) as user_count, username '))
    ->where('uid', '>=', 10)
    ->limit(100)
    ->groupBy('username')
    ->get()
;
dd($users);

参见日志存储/logs/laravel-2019-10-27.log：

[2019-10-27 17:39:17] local.DEBUG: [SQL EXEC] {"raw sql":"select count(*) as user_count, username  from `users` where `uid` >= '10' group by `username` limit 100","time":304.21} 

$data = User::toSql();
echo $data; //this will retrun select * from users. //here User is model

有很多信息已经得到了回答，我将发布我自己的发现，每当我需要在执行sql查询之前输出它时，我都会使用这些发现。

考虑以下示例：

$user = DB::table('user')->where('id',1);
echo $user->toSql();

echo$user->toSql（）=这将只输出原始查询，但不会显示传递的参数。

要输出带有传递参数的查询，我们可以使用laravel getBindings（）和helper str_replace_array，如下所示：

$queryWithParam = str_replace_array('?',$user->getBindings(),$user->toSql());
echo $queryWithParam;

希望这也有帮助。

我创建了一些简单的函数来从一些查询中获取SQL和绑定。

/**
 * getSql
 *
 * Usage:
 * getSql( DB::table("users") )
 * 
 * Get the current SQL and bindings
 * 
 * @param  mixed  $query  Relation / Eloquent Builder / Query Builder
 * @return array          Array with sql and bindings or else false
 */
function getSql($query)
{
    if( $query instanceof Illuminate\Database\Eloquent\Relations\Relation )
    {
        $query = $query->getBaseQuery();
    }

    if( $query instanceof Illuminate\Database\Eloquent\Builder )
    {
        $query = $query->getQuery();
    }

    if( $query instanceof Illuminate\Database\Query\Builder )
    {
        return [ 'query' => $query->toSql(), 'bindings' => $query->getBindings() ];
    }

    return false;
}

/**
 * logQuery
 *
 * Get the SQL from a query in a closure
 *
 * Usage:
 * logQueries(function() {
 *     return User::first()->applications;
 * });
 * 
 * @param  closure $callback              function to call some queries in
 * @return Illuminate\Support\Collection  Collection of queries
 */
function logQueries(closure $callback) 
{
    // check if query logging is enabled
    $logging = DB::logging();

    // Get number of queries
    $numberOfQueries = count(DB::getQueryLog());

    // if logging not enabled, temporarily enable it
    if( !$logging ) DB::enableQueryLog();

    $query = $callback();

    $lastQuery = getSql($query);

    // Get querylog
    $queries = new Illuminate\Support\Collection( DB::getQueryLog() );

    // calculate the number of queries done in callback
    $queryCount = $queries->count() - $numberOfQueries;

    // Get last queries
    $lastQueries = $queries->take(-$queryCount);

    // disable query logging
    if( !$logging ) DB::disableQueryLog();

    // if callback returns a builder object, return the sql and bindings of it
    if( $lastQuery )
    {
        $lastQueries->push($lastQuery);
    }

    return $lastQueries;
}

用法：

getSql( DB::table('users') );
// returns 
// [
//     "sql" => "select * from `users`",
//     "bindings" => [],
// ]

getSql( $project->rooms() );
// returns
// [
//     "sql" => "select * from `rooms` where `rooms`.`project_id` = ? and `rooms`.`project_id` is not null",
//     "bindings" => [ 7 ],
// ]