How to select the last row from database in laravel [duplicate] - php

Question

This question already has answers here:
Select Last Row in the Table
(22 answers)
Closed 4 years ago.
public function addNewPost(Request $request)/****ADD new POST****/
{
$this->validate($request,['post_title'=>'required|min:4|max:100',
'post_description'=>'required|min:20|max:500'
]);
$user_name = Session::get('name');
$post_title = $request->input('post_title');
$post_description = $request->input('post_description');
$addPost = new AddNewPost(['user_name'=> $user_name, 'post_title'=> $post_title, 'post_description'=> $post_description]);
$addPost->save();
$addPost->post_id;
//$addPost = DB::table('userposts')->where(['user_name'=>$user_name ])->orderBy('post_id', 'desc')->get();
print_r($addAdmin->post_id); //This is printing nothing, i.e. blank.
}
post_id column in userposts table is auto incremented. I am trying to get the last post id of the user by user_name. I have seen some tutorials and also checked some questions over internet but unable to do what I am trying to get. Can anybody know how to do it. Thank you.

Answer 1

Try first() instead of get() in a query it might help you
$lastdata = DB::table('userposts')->where(['user_name'=>$user_name ])->orderBy('post_id', 'desc')->first();
print_r($lastdata);

Answer 2

Laravel has the last() method that you can use.
This is from the docs:
last()
The last method returns the last element in the collection that passes a given truth test:
collect([1, 2, 3, 4])->last(function ($value, $key) {
return $value < 3;
});
// returns 2
You may also call the last method with no arguments to get the last element in the collection. If the collection is empty, null is returned:
collect([1, 2, 3, 4])->last();
//returns 4
Here is the example for getting only the last id:
Model::pluck('id')->last();

Answer 3

DB::table('userposts')->last()->pluck('user_name') Is the fastest way .
Make sure to apply last() first to avoid unnecessary workload

Answer 4

Simple method which will not takes much processing is
DB::getPdo()->lastInsertId();
Hope this helps
You can also try
$addPost = new AddNewPost(['user_name'=> $user_name, 'post_title'=> $post_title, 'post_description'=> $post_description]);
$addPost->save();
$addPost->update();
print_r($addPost->post_id); //It will print id..
P.S second method is kind of redundant
Hope this helps

Answer 5

Please have a closer look at your print statement:
print_r($addAdmin->post_id);
The $addAdmin is not defined within the scope of your function. The best way to get the last row from your database:
DB::table('name_of_table')->last()->pluck('user_name')
Here is the documentation on using DB: https://laravel.com/docs/5.6/database