logo
down
shadow

create relation between two tables


create relation between two tables

By : Zenan Lyu
Date : November 20 2020, 11:01 PM
this one helps. When using the Relation object of DAO you need to specify for the first field the name of an existing field from the first table (usually this is the primary key) and for the ForeignName property the name of a field of the second table that act as ForeignKey to the first table.
So suppose you have a Deparment table with
code :
IDDepartment (integer, primary key)
Description (text, not null)
IDEmployee (integer, primary key)
Name (text not null)
IDDepartment (integer, foreign key to Department table)
string choice1 = "Department";
string choice2 = "Employee";
string fieldPK = "IDDepartment"; // It is the primary key of Department
string fieldFK = "IDDepartment"; // It is the foreign key in table Employee that links to the Department table
Relation myrel = clsDataSource.mydb.CreateRelation(namerelationship,  
                 choice1, choice2);
Field myfield = myrel.CreateField(fieldPK);
myfield.ForeignName = fieldFK;
myrel.Fields.Append(myfield);
clsDataSource.mydb.Relations.Append(myrel);


Share : facebook icon twitter icon
How to create a relation between two tables using PHPMyAdmin?

How to create a relation between two tables using PHPMyAdmin?


By : user1884779
Date : March 29 2020, 07:55 AM
Does that help This only works if you use InnoDB as storage engine. Then you have a link Relation view besides Print view:
ManyToMany relation don't create all tables

ManyToMany relation don't create all tables


By : ʠẫɀí Ŝȁḋặƣẫť
Date : March 29 2020, 07:55 AM
This might help you If you only define the relationship like this and do nothing else in the product entity it's not gonna work. What you have defined here is only the inverse side because of the
code :
mappedBy="service"
inversedBy
<?php

namespace Test\TestBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * Product
 *
 * @ORM\Table()
 * @ORM\Entity
 */
class Product
{
    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255)
     */
    private $name;


    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set name
     *
     * @param string $name
     * @return Product
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string 
     */
    public function getName()
    {
        return $this->name;
    }
}
<?php

namespace Test\TestBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * Service
 *
 * @ORM\Table()
 * @ORM\Entity
 */
class Service
{
    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255)
     */
    private $name;

    /**
     * @ORM\ManyToMany(targetEntity="Product", cascade={"persist", "remove"})
     */
    private $products;


    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set name
     *
     * @param string $name
     * @return Service
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string 
     */
    public function getName()
    {
        return $this->name;
    }
}
Create tables with Many-to-One relation in Postgresql

Create tables with Many-to-One relation in Postgresql


By : user2860723
Date : March 29 2020, 07:55 AM
I hope this helps . Use a separate table, called a junction table or join table (and unfortunately has many other names)
code :
CREATE TABLE Products_in_shop (
   shop_id INTEGER,
   product_id INTEGER
)
SELECT p.Name
FROM Shop AS s
JOIN Products_in_shop AS pis ON pis.shop_id = s.id
JOIN Product AS p ON pis.product_id = p.id
WHERE s.Name = 'MyShop'
Create relation between two PostgreSQL tables

Create relation between two PostgreSQL tables


By : user3008291
Date : March 29 2020, 07:55 AM
hop of those help? As documented in the manual you declare a foreign key constraint:
code :
alter table location
  add constraint fk_location_shop
  foreign key (shop, symbol) 
  references shop (shopid, symbol);
PostgreSQL trying to create a relation between 2 tables

PostgreSQL trying to create a relation between 2 tables


By : user3498946
Date : March 29 2020, 07:55 AM
hop of those help? That would typically be modeled by third table. That table has an ID of a movie and an id of a category per row. If and only if a movie is in a category, there is a row with the movie's ID and the category's ID in it.
code :
CREATE TABLE movie
             (id_movie integer,
              title char(50),
              release date,
              url char(100),
              local char(50),
              resume char(200),
              PRIMARY KEY (id_movie));

CREATE TABLE category
             (id_category integer,
              category char(50));

CREATE TBALE movie_category
             (id_movie integer,
              id_category integer,
              PRIMARY KEY (id_movie,
                           id_category),
              FOREIGN KEY (id_movie)
                          REFERENCES movie
                                     (id_movie),
              FOREIGN KEY (id_category)
                          REFERENCES category
                                     (id_category));
Related Posts Related Posts :
  • Map an object to an object with a sub list
  • .NET Core get connection string from appsettings.json
  • Where can i find some themes/demo for UI in WPF application?
  • Console Application to retrieve Domain Shared Contacts (Google Apps Admin SDK)
  • How combine two different Paths
  • EntityFramework-Plus and ASP.NET Memory Cache expiration
  • How to pre-populate vimeo password protected video in the website
  • An exception of type 'System.ArgumentNullException' occurred in Microsoft.AspNet.Identity.EntityFramework.dll
  • Getting the error message: “Could not find a part of the path"
  • Race conditition when using Process RedirectStandardError and RedirectStandardOutput,
  • How do I use an array from code in the xaml file? C#
  • How do I insert data when the primary key column is not an identity column?
  • recursively step through asp table (that has been populated with a query)
  • Redirect to login when unauthorized in ASP.NET Core
  • What is the difference between a RibbonWindow and Window?
  • Picking random objects from class
  • How to link to a header file in a C# using Visual Studio
  • Why GetEntryAssembly returns null?
  • Setting focus to textbox upon method-execution
  • How to get Column values stored in session datatable?
  • Asynchronous error handling in MVC 5 filters
  • Unable to animate the character in unity3d
  • C# Generic to Session
  • Change keys Extended WPF Toolkit Zoombox
  • At least one object must implement IComparable order by
  • What is the reference that need to be added for "using Microsoft.Web.WebPages.OAuth" to get facebook authentic
  • Windows 10 - Background Task write to App's Calendar
  • Custom helper works with input type but not with Html helper
  • How to get the guid of a process that is running
  • UWP - Template10 pageheader ellipsis tabstop on version 1.1.12
  • Check id from two tables, if there is no match delete it
  • Counting how many occurences have been between datetimes
  • Xamarin.form - Masterdetailpage : System.Reflection.TargetInvocationException: Exception has been thrown by the target o
  • Add asp.net LinkButton to a Literal using c#
  • Xamarin.Forms (WinPhone) Hide the Title space NavigationBar for Xamarin.Forms.NavigationPage. Please
  • Get connection string in .NET Core application
  • C# import dll function with const string& as parameter
  • How to navigate from browser to application in Citrix
  • Create buttons dynamically from code behind in ASP.NET
  • Filling datatable with int array.
  • Post data using WebClient in C# and server replay Bad Gateway
  • Collections Generic List anonymous type to System Data.IDataReader
  • How to call async method from not async method?
  • c# compare two lists based on sub items and return the difference
  • Entity Framework: Navigation Property from a service
  • Can't declare Session variable in asp.net sharepoint page
  • How to intercept filterchain for maintenance in a WebApi project
  • Entity Framework - Use Dynamic connection string with Oracle Provider
  • Inconsistent Convert.ToDouble(decimal) results
  • Get Child Directory from Path
  • Unable to resize StackPanel when IDataErrorInfo is triggered
  • How to stop "Update Background Files"?
  • Proper way to use dependency injection when some arguments will be known only at runtime
  • How to remove duplicate List in my List<List<int>> object?
  • Unable to cast object of type 'MongoDB.Bson.Serialization.Serializers.DateTimeSerializer' to type 'MongoDB.Bson.Serializ
  • Lightswitch submit a form on enter key
  • Business Logic in the JavaScript
  • tcp socket asynchronous communication
  • Syntax match using regex in c#
  • Display timerpickerdialog within a fragment using Xamarin Android
  • shadow
    Privacy Policy - Terms - Contact Us © soohba.com