In this webinar we will explore customizing your Salesforce1 data model. Different relationship types and utilisation in queries or in your custom Apex Code will be the main themes we will focus on. If you’ve ever wondered, “Lookup or Master Detail?”, or if even that question makes you scratch your head, this webinar is for you.
Key Takeaways
Tools for creating relationships
Key distinctions between Lookup and Master Detail relationships
Thinking beyond the database with relationships
Common query and Apex patterns when using relationship data
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4. Agenda
Data Model & Relationships
Comparing Force.com with Relational DBMS
Relationship Types & the Predefined Join
Relationships & SOQL
SOQL vs SQL
Relationship Queries
5. Assumptions
A basic understanding of the Force.com Platform
including:
– Creating Custom Objects
– Adding Custom Fields
– Navigating the UI
Knowledge of relational database concepts
– Tables
– Primary/Foreign Keys
– Joins
6. Data Model and Relationships
Relationships and SOQL
Agenda
7. Data Model and the Force.com Platform
sObject:
– Table-like data structure
• Records
• Fields
– Extensible
– Queryable/Updatable
– Relationships
Automatic Features:
– User Interface
– Security
• CRUD
• Field-level
• Record-level (ACL)
– REST & SOAP APIs
8. Standard Data Model
Standard Objects
– Account
– Contact
– Lead
– Opportunity
– Case
– …
Standard Fields
– Id
– Name
– CreatedBy/Date
– LastModifiedBy/Date
– OwnerId
– IsDeleted
– …
10. Relationships: The Predefined Join
RDBMS
– Join at runtime
with SQL or
view
Force.com
– Predefined join
at design-time
– Similar to
integrity
constraints
13. Data Model and Relationships
Relationships and SOQL
Agenda
14. SOQL
Salesforce Object Query Language
SQL-like syntax
Queries the Force.com Object Layer
Used in:
– Apex
– Developer Tools (Developer Console, Eclipse, Workbench, …)
– API (REST, SOAP, Bulk, …)
15. From SQL to SOQL
At first may look familiar
Important differences
Learn the differences
Use good data design practices
16. From SQL to SOQL: The Familiar Bits
Table-like structure
Similar query syntax
Indexed
Transactional
Triggers
SELECT Id, Name, Capacity__c
FROM Room__c
WHERE Capacity__c > 10
17. From SQL to SOQL: Immediate Differences
No select *
No views
SOQL is read-only
Limited indexes
Object-relational mapping is automatic
Schema changes protected
18. From SQL to SOQL: Differences To Learn
sObjects are not actually tables – multi-tenant
environment
Relationship metadata
– Management of referential integrity
– Predefines joins
– Relationship query syntax
Query usage explicitly metered
– API Batch Limits
– Apex Governor Limits
19. The __c and __r Suffixes
Room__c
Workshop__c
Id
Id
Room__c
Room__r
Workshops__r Type:
List<Workshop__c>
Type: Id
Type: Room__c
1-M
20. Relationship Query: Child to Parent
SELECT Id, Name, Room__c,
Room__r.Id,
Room__r.Capacity__c
FROM Workshop__c
WHERE Status__c = ’Open’
[
{
"Id": "a0145000000aBf4AAE",
"Name": "Yoga for Beginners",
"Room__c": "a00vn000000dU3dAAE",
"Room__r": {
"Id": "a00vn000000dU3dAAE",
"Capacity__c": 10
}
},
{
"Id": "a0145000000aBf4AAE",
"Name": "Yoga for Beginners",
"Room__c": "",
"Room__r": ""
}, ...
]
24. Demo Use Case:
– Find a tally of empty spaces
being held for workshops that
are not actively enrolling
delegates
25. Recap
Data Model &
Relationships
– Much that looks similar,
but
– Many important
differences
– Predefined Join
– Relationship Types
Relationships & SOQL
– SOQL has relations but is
not “relational”
– Limits cannot be ignored
– Good design principles
still apply but check your
assumptions
26. Read More
Article: From SQL to SOQL http://bit.ly/sql2soql
SOQL-SOSL Guide http://bit.ly/soqlsosl
Sharing http://bit.ly/sharingarch
Limits http://bit.ly/apexgovlim
Multi-Tenant Architecture http://bit.ly/sfmultiten
27. Next Webinar:
May 15: Intro to building Mobile Apps with
Salesforce1 Platform – No code required