Laravel雄辯的更新記錄沒有從數據庫加載

Question

我對laravel很新，我試圖從表單的輸入更新記錄。但是我發現要更新記錄，首先需要從數據庫中獲取記錄。 是不是可以像更新記錄（設置主鍵）：

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

Answer 1

您可以簡單地使用查詢生成器，而不是口若懸河，這個代碼直接在數據庫中更新數據:)這是一個示例：

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

您可以檢查這裏的文檔的詳細信息：http://laravel.com/docs/5.0/queries#updates

Answer 2

首先你需要加載該行更新：

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

我你的情況

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

Answer 3

使用屬性exists：

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

這裏的API文檔：http://laravel.com/api/5.0/Illuminate/Database/Eloquent/Model.html

Answer 4

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

Answer 5

您還可以使用firstOrCreate OR firstOrNew

// 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(); 

希望它會幫助你:)