Advertisements I’ve been trying to solve this problem but I am stuck at the last bit and my University lecturer doesn’t really want to help me 🙂 T(1) = 1 T(n) = n*T(n/2) T(n/2) = n/2 * T(n/4); T(n/4) = n/4 * T(n/8); T(n/8) = n/8 * T(n/16); The four forms: 1) T(n) = n… Read More Recurrence relation: T(n) = n*T(n/2)
Advertisements I’m new to Spring and I’m probably making the dumbest mistake, but I can’t solve this problem for more than 2 hours. According to the video tutorial, I did Pagination, I did it exactly like his, but he did not have relationships between entities. I think the error is in a one-to-one relationship between… Read More javax.persistence.EntityNotFoundException: Unable to find kg.library.spring.library_spring.entity.Author with id 10000001
Advertisements In laravel Many to Many relationship like the one in the Laravel Documentation example. https://laravel.com/docs/9.x/eloquent-relationships#many-to-many users id – integer name – string roles id – integer name – string role_user user_id – integer role_id – integer In the Users model I have public function roles() { return $this->belongsToMany(Role::class); } In the Roles model I… Read More Laravel Many To Many Get element that I dont have a relationship with
Advertisements To start, here’s a dummy table I’ve made to show the data I’m working with: employee title division email Boss Person boss o bp@email John Smith supervisor a jos@email Jane Smith supervisor b jas@email Leo Messi employee a lm@email Amanda Kessel employee a ak@email Derek Jeter employee b dj@email I want to end up… Read More SQL join manager from same table onto a row with their employees
Advertisements Earlier I had the following classes with relationship [Table("User")] public class User { // Base properties [Key] public int UserId { get; set; } public string Name { get; set; } // Relationships public ICollection<UserRole> UserRoles { get; set; } } [Table("UserRole")] public class UserRole { // Base properties [Key] public int UserRoleId {… Read More Why can't EF Core 3.1 not able to determine the relationship
Advertisements This sounds stupid but I can’t find a way to retrieve a record from eloquent model Gallery.php: <?php namespace App\Models; use Illuminate\Database\Eloquent\Factories\HasFactory; use Illuminate\Database\Eloquent\Model; class Gallery extends Model { use HasFactory; protected $fillable = [‘text’]; } Calling from a Route in web.php: $data = Gallery::with(‘id’, ‘=’, 1)->get(); throws this error in laravel.log: local.ERROR: Call… Read More How to retrieve record from Eloquent Model?
Advertisements Currently working on an application which uses hibernate and MySQL. I saw the following output in my Logs which surprised me: Hibernate: select user0_.id as id1_3_, user0_.email as email2_3_, user0_.name as name3_3_ from test_user user0_ order by user0_.name asc limit ?, ? Hibernate: select count(user0_.id) as col_0_0_ from test_user user0_ 2022-05-11 10:49:23.650 INFO 21384… Read More Hibernate, MySQL, relationship between batches, JDBC connections and JDBC statements
Advertisements I have a database with multiple address records of a user. When I do "pluck()" and "join()" in the foreach path, I get results. But when I type $user->getAddress->address in structures like hasOne, I get the result I want. In short, can I return the loop in hasMany more practically? Following my code: user… Read More Eloquent Relationships hasMany use loop
Advertisements Starting with a dataframe like this: df = pd.DataFrame({‘A’: [1, 2, 3, 4, 5], ‘B’: [‘a’, ‘b’, ‘b’, ‘b’, ‘a’]}) A B 0 1 a 1 2 b 2 3 b 3 4 b 4 5 a What is the best way of getting to a dataframe like this? pd.DataFrame({‘source’: [1, 2, 2, 3],… Read More How to get all unique combinations of values in one column that are in another column