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Can we write SOQL in the constructor?
Well having a SOQL in the constructor is not bad practice unless its very bad and heavy SOQL which increases the page load time. That being said, What if you are doing a SOQL in the constructor and then not using that variable/list. In that case it makes sense to postpone that SOQL into a getter.
Can we write DML and SOQL in the constructor?
No you can’t perform any DML in Constructor.
Can we do DML in constructor?
DML operation is not allowed in the constructor of Apex class. Whenever we go for a DML operation in constructor it resticts us in Salesforce. Only DDL is allowed.
Why do we use constructor in Salesforce?
A constructor is code that is invoked when an object is created from the class blueprint. You do not need to write a constructor for every class. In Apex, a constructor can be overloaded , that is, there can be more than one constructor for a class, each having different parameters.
Can we perform DML operation in trigger?
Before Trigger: Before triggers are used to perform the logic on the same object and specifically we cannot use the DML operation (Insert, update, delete) on these triggers. These triggers fired before the data saved into the database.
What is overriding in Salesforce?
Overriding a virtual method allows you to provide a different implementation for an existing method. This means that the behavior of a particular method is different based on the object you’re calling it on.
When to use the Super constructor in Java?
In cases where a parent class has a default constructor the call to super is inserted for you automatically by the compiler. Since every class in Java inherits from Object, objects constructor must be called somehow and it must be executed first.
How to create a soql function in Lightning?
The above can be accomplished by creating a small utility component that defines the apex and soql functions. First we’ll create a new Lightning Component and name it ApexHelper. This component will contain a component body and also contain some code in the helper JavaScript file.
Why does Java define constructorbody in this way?
And the reason why Java defined the ConstructorBody in this way, is that they needed to maintain the hierarchy of the object. Remember the definition of the inheritance; It’s extending a class. With that being said, you cannot extend something that doesn’t exist.
How is the apex variable referenced in soql?
You can use the Apex variable in SOQL query to fetch the desired results. Apex variables can be referenced by the Colon (:) notation.