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How can I access a sobject field in apex?
As in Java, SObject fields can be accessed or changed with simple dot notation. For example: System-generated fields, such as Created By or Last Modified Date, cannot be modified. If you try, the Apex runtime engine generates an error.
How do you delete a field in apex?
To erase the current value of a field, set the field to null. If an Apex method takes an SObject parameter, you can use the System.isSet () method to identify the set fields. If you want to unset any fields to retain their values, first create an SObject instance. Then apply only the fields you want to be part of the DML operation.
How to use dynamic soql query in Apex code?
We will use dynamic SOQL query in Apex code. First we need to create a fieldset. Go to Setup > Customize > Accounts > Field Set Click on new. Enter all mandatory fields. Also drag and drop all required fields in fieldset. We will get following output in visualforce page:
How to create a fieldset in Apex code?
In the example below, we will use fieldset to display account list on visualforce page. We will use dynamic SOQL query in Apex code. First we need to create a fieldset. Go to Setup > Customize > Accounts > Field Set Click on new. Enter all mandatory fields. Also drag and drop all required fields in fieldset.
How do I unset a field in apex?
If an Apex method takes an SObject parameter, you can use the System.isSet () method to identify the set fields. If you want to unset any fields to retain their values, first create an SObject instance. Then apply only the fields you want to be part of the DML operation.
Can a sobject field be set or not set?
Once you have converted the generic SObject record into a Contact, Lead, or Account, you can modify its fields accordingly: SObject fields can be initially set or not set (unset); unset fields are not the same as null or blank fields.
Can you change the ID field in apex?
If you try, the Apex runtime engine generates an error. Additionally, formula field values and values for other fields that are read-only for the context user cannot be changed. If you use the generic SObject type instead of a specific object, such as Account, you can retrieve only the Id field using dot notation.