Context Variables In Salesforce

Table of Content - Context Variables In Salesforce

• What are Context Variables?
• Different context variables
• Program Logic#1
• Program Logic#2:Skeletal Structure of program with Logic
• Program Logic#3
• Program Logic#4

All the triggers define implicit variables that allow developers to access run-time context. These variables are contained in the System. Trigger class.

For Example: 

Trigger PropertyDiscountTrigger on Property__c (Before Insert){
    RowHouseDiscount.applyDiscount(Trigger.new);
}

Trigger. new - It is a default function in Salesforce. After trigger activation, it loads all the records. It cannot be modified, and trigger. new is called “Context Variable”. It is of List Type.

Trigger.new - Assume that it is going to give us lists of records due to which trigger got called.

What are Context Variables?

This is a special variable, managed/created by Salesforce itself, where we get the information about the Trigger. And that helps us to write better code with better practice.

We have different context variables, and they are mentioned below:

Sample Code for isExecuting Skeletal Structure of program with Logic

Trigger in Apex Class:

---Code---
---Code---

if(Trigger.isExecuting == True){

    ---Code---
}

---Code---
---Code---
---Code---

Sample Code for “isInsert”: Skeletal Structure of program with Logic

Trigger in Apex Class:

Program Logic#1:

---Code---
---Code---

if(Trigger.isInsert == True){

    ---Code---
}

---Code---
---Code---
---Code---

Program Logic#2: Skeletal Structure of program with Logic

---Code---
---Code---
if(Trigger.isInsert == True && Trigger.isUpdate == True ){
    ---Code to work only before insert is done----
    ---Not for update, not for insert-------------------
}

---Code---
---Code---
---Code---

…..Same way :: we can process for

isUpdate
isDelete
isBefore
isAfter
isUndelete

Program Logic#3: How to call a code in the trigger which client wants to call when an update is done.

Solution: Skeletal Structure of program with Logic

---Code---
---Code---

if(Trigger.isUpdate == True && Trigger.isAfter == True ){

    ---Code to work only before insert is done----
    ---Not for update, not for insert-------------------
}

---Code---
---Code---
---Code---

Solution: Skeletal Structure of program with Logic

---Code---
---Code---
if(Trigger.isBefore == True && Trigger.isDelete == True ){

    ---Code to work only before insert is done----
    ---Not for update, not for insert-------------------
}
---Code---
---Code---
---Code---

In the next topic, we will discuss in-detail about “Context Variables in Salesforce - 1”. Keep following us for more info on Salesforce Development / Programming.

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