one-to-many

问题 Here's my problem. In my project, I have a one-to-many relationship between class FactureAchat and LigneFactureAchat, when I add a Facture the products are added in the Table ligne_facture_achat without having adding the foreign key of my Facture and an error is produced "Could not determine access type for property "LinesInvoicesPurchases". " the same problem with the display of a facture with its products. "An exception has been thrown during the rendering of a template (" Notice: Undefined

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed last month . I'm back with my survey data. This time, I need to remove a specific set of rows from data when they occur. In our survey, an automated telephone survey, the survey tool will attempt three times during that call to prompt the respondent to enter a response. After three timeouts of

问题 The error Cannot delete or update a parent row: a foreign key constraint fails. The classes class Teacher { /** *@ORM\OneToMany(targetEntity="publication", mappedBy="teacher") */ protected $publications; } class Publication { /** * @ORM\ManyToOne(targetEntity="Teacher", inversedBy="publications") * @ORM\JoinColumn(name="teacher_id", referencedColumnName="id") */ protected $teacher; } I want What I want is to make it that when you delete a teacher, the id_teacher is modified to NULL. I want to

问题 The error Cannot delete or update a parent row: a foreign key constraint fails. The classes class Teacher { /** *@ORM\OneToMany(targetEntity="publication", mappedBy="teacher") */ protected $publications; } class Publication { /** * @ORM\ManyToOne(targetEntity="Teacher", inversedBy="publications") * @ORM\JoinColumn(name="teacher_id", referencedColumnName="id") */ protected $teacher; } I want What I want is to make it that when you delete a teacher, the id_teacher is modified to NULL. I want to

问题 I have two entity classes Country and Language having bi-directional one to many relationship. Below are the entity classes: @Entity @Table(name = "COUNTRY") public class Country { @Id @GeneratedValue @Column(name = "COUNTRY_ID") private Long id; @Column(name = "COUNTRY_NAME") private String name; @Column(name = "COUNTRY_CODE") private String code; @JacksonXmlElementWrapper(localName = "languages") @JacksonXmlProperty(localName = "languages") @OneToMany(mappedBy = "country", fetch = FetchType

问题 i'm building a Q&A site and my questions, answers and comments are on the same posts table. But their postType is different. I can get answers for a question and comments for an answer with this association: /** * @OneToMany(targetEntity="Cms\Entity\Post", mappedBy="parent") */ private $answers; /** * @OneToMany(targetEntity="Cms\Entity\Post", mappedBy="parent") */ private $comments; But i think this is not the correct way to do this because if i fetch a question both answers and comments are

问题 Entities: Team <-> TeamEmployee <-> Employee Requirements: A Team and an Employee can exist without its counterpart. In the Team-TeamEmployee relation the Team is responsible (parent) [using later a TeamRepository]. In the Employee-TeamEmployee relation the Employee is responsible (parent) [using later an EmployeeRepository]. Duplicates are not allowed. Deleting a Team deletes all Employees in the Team, if the Employee is not in another Team. Deleting an Employee deletes only a Team, if the

问题 I have a Person class that has a navigation property ICollection<Address> Addresses . The Address entity has a property City . I want to give the user an option to create/update a Person along with its addresses, including adding and removing ones. So for displaying the addresses I simply call @Html.EditorFor(m => m.Addresses) , and the razor engine takes care of the collection using my custom template that resides in the EditorTemplates folder, generating foreach field a matching signature

问题 Hello i am facing a problem: I need to store a tree representation of subjects. I mean a SUBJECT have a list of childrens of type SUBJECT @DatabaseTable(tableName = "subject") public class Subject implements Serializable { @DatabaseField(columnName = "_id") private int id; @DatabaseField private String text; @DatabaseField(columnName = "parent", foreign = true) private Subject parent; @ForeignCollectionField private List<Subject> sons; this code throws an error 9950-9950/ec.com.smx.flux E/EC

问题 Instead of getting into code, I have a simple question. Default behavior for a simple one-to-many is that it inserts the child record then updates the foreign key column with the parent key. Has anyone ever had a one-to-many where the child object gets inserted but not updated resulting in a row in my table with a null in the foreign key column? I want the default behaviour for a standard one-to-many. I don't want to have to add the parent as a property to the child. Thanks. 回答1: This would