Laravel雄辩更新记录,无需从数据库加载

Question

我对laravel很新,我正在尝试从表单的输入更新记录.但是我看到要更新记录,首先需要从数据库中获取记录.是不是可能更新记录(主键设置):

$post = new Post();
$post->id = 3; //already exists in database.
$post->title = "Updated title";
$post->save();

Answer 1

Post::where('id',3)->update(['title'=>'Updated title']);

Answer 2

您可以简单地使用查询生成器而不是Eloquent,此代码直接更新数据库中的数据:)这是一个示例:

DB::table('post')
            ->where('id', 3)
            ->update(['title' => "Updated Title"]);

您可以在此处查看文档以获取更多信息:http://laravel.com/docs/5.0/queries#updates

Answer 3

使用属性exists:

$post = new Post();
$post->exists = true;
$post->id = 3; //already exists in database.
$post->title = "Updated title";
$post->save();

以下是API文档:http://laravel.com/api/5.0/Illuminate/Database/Eloquent/Model.html

Answer 4

常见的方式是加载要更新的行：

$post = Post::find($id);

我你的情况

$post = Post::find(3);
$post->title = "Updated title";
$post->save();

但是在一个步骤中（只需更新），您可以执行以下操作：

$affectedRows = Post::where("id", 3)->update(["title" => "Updated title"]);

Answer 5

您也可以使用firstOrCreateORfirstOrNew

// Retrieve the Post by the attributes, or create it if it doesn't exist...
$post = Post::firstOrCreate(['id' => 3]);
// OR
// Retrieve the Post by the attributes, or instantiate a new instance...
$post = Post::firstOrNew(['id' => 3]); 

// update record
$post->title = "Updated title";
$post->save();

希望它能对您有所帮助:)