Relationships in Apex

Ratings:
(4)
Views:0
Banner-Img
  • Share this blog:

Relationships in Apex

Relationship Queries 

Child-to-Parent relationship Using the relationships, we can retrive the related Objects data using the SOQL query. Contacts --------------<-----------Account Relationship name = Account Child to parent Relationship In the child -to-parent Relationship, we can query on Contact and retrieves the values from Account that is associated. Ex:

Contact C = [Select First Name, LastName, Account.Name, Account.Industry from Contact where id = 'XXXXX'];
System.debug (c. Account .Name); --->Prints the Account Name of Contact
System.debug (C. Account. Industry); ---> Prints the industry field value from account

Parent to child relationship

In the parent-to-child relationship. We can query on the parent object and we will get the details about child records. EX:

Account a = [Select Name, (Select Contact .FirstName, contact .LastName from Account. Contacts) From Account where id ='xxxxxxx']
System debug (a); àthis will give all the Contact for that account
For (Contact C: a.Contacts)
{
system.debug (C. First Name);
}

This statement displays FirstName of all contacts that are associated with the account.When we want to write query on parent to child relationship then we need to write subquery ( query within another query)

Enthusiastic about exploring the skill set of Salesforce?Then, have a look at the Salesforce Training Online to gather additional knowledge.

Custom Relationships:-

This selection explains how relationship names for Custom objects and Custom fields that are created and used

*When we use a relationship name in a query. We must use the relationship
names without __c. instead, append an ---r(underscore underscore r).
Daughter__c------------------- > --------Mother-of-child__c
Relationship Name =Mother -of-child--- r, child -to-parent Relationship.

parent-to-child Relationship, Relationship =Daughter--r When we use a child-to-parent relationship. EX:- Daughter_ _c D= [Select id, First name _ _C, Mother-of child_ _r.firstname from daughter where LastName_ _C LIKE 'C%'] The above query returns the ID and first name of daughter objects, and the first name of the daughter's mother if the mother’s last Name begins with 'C' EX:- SELECT LastName __c, (Select LastName__c From Daughters --r) FROM mother- of-child __c. The above query returns the Last name of all mothers, and for each mother returned, the last name of the mother's daughters.

 

You liked the article?

Like : 0

Vote for difficulty

Current difficulty (Avg): Medium

Recommended Courses

1/15

About Author
Authorlogo
Name
TekSlate
Author Bio

TekSlate is the best online training provider in delivering world-class IT skills to individuals and corporates from all parts of the globe. We are proven experts in accumulating every need of an IT skills upgrade aspirant and have delivered excellent services. We aim to bring you all the essentials to learn and master new technologies in the market with our articles, blogs, and videos. Build your career success with us, enhancing most in-demand skills in the market.


Stay Updated


Get stories of change makers and innovators from the startup ecosystem in your inbox