composite-primary-key Questions
10
I was working on an Access database which loved auto-numbered identifiers. Every table used them except one, which used a key made up of the first name, last name and birthdate of a person. Anyways...
Jubal asked 18/8, 2010 at 13:59
3
Solved
I have a problem with Hibernate @EmbeddedId.
@Embeddable
public class EnrolRegEmbededId implements Serializable
{
@Column(name="ENROL_NO")
private String enrolNo;
@Column(name="REG_...
Boutte asked 31/8, 2018 at 7:43
3
Solved
I'm having trouble with the ordering of the columns in my composite primary key. I have a table that contains the following:
@Embeddable
public class MessageInfo implements Serializable {
privat...
Militant asked 15/11, 2011 at 16:13
3
Solved
How to provide primary key for multiple column in a single table using PostgreSQL?
Example:
Create table "Test"
(
"SlNo" int not null primary key,
"EmpID" int not null, /* Want to become prim...
Sorkin asked 8/5, 2014 at 5:10
9
Solved
I have in my DataBase a table with two primary keys (id and language_id) and I need put it in my models. The default primaryKey in Models (Model.php in Laravel 5) is id, and I want that the primary...
Nonreturnable asked 14/7, 2015 at 19:5
4
Solved
I have to work with hibernate and not very sure how solve this problem, I've 2 table with a 1..n relationship like this:
-------
TABLE_A
-------
first_id (pk)
second_id (pk)
[other fields]
----...
Hypodermic asked 22/8, 2011 at 11:18
5
Solved
I get the following exception while inserting an object with hibernate. Reading from the database works like a charm. I use MySQL 5.5 as database provider and hibernate 3.6.5.
I have the following...
Charactery asked 19/7, 2011 at 8:44
2
Solved
I'm using Asp.Net Core 2.1, Mvc, c#, EF Core with Code First and Migrations.
I'm trying to build a table that has a composite primary key in the Migration.Up() method:
migrationBuilder.CreateTa...
Emlen asked 23/8, 2018 at 20:36
8
Solved
I would like to see an example of:
When this is appropriate
When this is not appropriate
Is there a time when the choice of database would make a difference to the above examples?
Amidase asked 5/2, 2010 at 0:58
3
Solved
I am using Room persistent library. I have requirement to add two primary keys in one table and one of the primary key should be auto increment. I don't know exact syntax to achieve this. Below is ...
Beitz asked 17/10, 2017 at 13:2
3
Solved
I use spring data rest for crud. But when the entity has composite primary keys, I dont know how to to get an entity by giving the primary key.
River class:
@Entity
public class River {
private ...
Polygamous asked 3/5, 2017 at 14:42
2
Solved
In an ERD, a weak/non-identifying relationship is one that connects two strong entities, and is indicated with a dashed line. A strong/identifying relationship is one that connects a strong entity ...
Haag asked 18/1, 2016 at 2:31
3
I have two tables
Table1(
FileID,
BundledFileID,
Domain)
and
Table2(
FileID,
FileType,
FileName)
In Table2 FileID and FileType are the composite primary key. I want to create a foreig...
Melinite asked 22/10, 2010 at 12:31
6
Solved
I have a table that is missing a column in its primary key constraint. Instead of editing it through SQL Server, I want to put this in a script to add it as part of our update scripts.
What syntax ...
Armandinaarmando asked 6/1, 2012 at 17:6
0
Let's say I have the following database schema:
class A(Base):
__tablename__ = "a_table"
id = Column(Integer, primary_key=True, autoincrement=True)
version = Column(Integer, primary_k...
Trine asked 19/8, 2021 at 7:52
3
my question is an extension of this question (also mine :) ) -> Room composite Primary Key link to Foreign Key
So, if I have this class:
public class FoodWithIngredients extends Food{
@Relation(...
Shuttle asked 15/5, 2018 at 12:52
3
Solved
The EmbeddedId or IdClass annotation is used to denote a composite primary key.
How can i use composite primary key without ( EmbeddedId or IdClass ) ?
If it is possible to use composite primary k...
Silent asked 11/6, 2013 at 11:28
3
Solved
Let's say I have the following model:
class Molecule(Base):
db = Column(Integer, primary_key=True)
id = Column(Integer, primary_key=True)
data = Column(Integer)
class Atom(Base):
id = Column(...
Middlebreaker asked 6/3, 2013 at 17:58
2
Solved
I spent hours and hours searching for this one, and just by trial and error was I able to finally find the solution. Logging this in Stack Overflow for future searchers.
Q:
How do I create a comp...
Takeoff asked 22/11, 2015 at 7:10
4
Solved
How can I define a composite primary key consisting of two fields in SQL?
I want to make a table name voting with fields QuestionID, MemberID, and vote. And the Composite primary key consists of th...
Ulrikaumeko asked 10/7, 2009 at 15:44
3
I have the following table defined in Cassandra 2.0.9:
CREATE TABLE history
(
histid uuid,
ddate text, -- Day Date, i.e. 2014-11-20
valtime timestamp, -- value time
val text, --value
PRIMARY ...
Brigettebrigg asked 27/1, 2015 at 15:45
3
Solved
I have 2 tables. 1 called events with an event ID and another table called tickets which I want to have primary keys of event ID and ticket ID. I am also using a PostgreSQL database. At the moment ...
Jacques asked 3/3, 2019 at 11:19
1
Solved
I have a table with a composite primary keys including it's own and a FK from other table.
I decided not to use an @IdClass nor @EmbeddedId.
class SomeEntity {
@Id
private String someId;
@Id...
Minoru asked 19/6, 2020 at 8:54
2
Solved
Say I have a class that looks like this:
public class MyClass {
@Id
@Column(name = "ID")
private long Id;
}
I can use a hibernate session to do a get or load on the class like this:
MyClass ...
Organogenesis asked 28/4, 2015 at 17:11
3
Situation
I have an Entity with a DiscriminatorColumn, configured for single table inheritance:
@Entity
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name="TYPE"...
Qualification asked 15/6, 2012 at 11:17
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