A field set is a grouping of fields for an object. Creating field sets in Salesforce is an easy way to dynamically query fields and dynamically binding the fields to display field sets on your Visualforce pages which can save you a big chunk of time. Field set is an out of the box feature provided by Salesforce and you can create field sets for Standard as well as custom objects and supports the inclusion of custom and Standard fields.
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How to create fieldset: The first step for this would be to create the Fieldset. For example, to create field set for Account object, Go to Setup > Customize > Accounts > Field Set. You can now drag and drop all fields you want in this fieldset.
How to Use field set in Visualforce page: If we are using standard controller, then using fieldset in visualforce is straight forward. You can use the global variable for fieldsets to access the field set you created to dynamic binding the fields in fieldset to the visualforce pages. In the interesting thing to note here is that the page will display only those fields which are part of the specified fieldset. So if in future you want to add or remove something from the visual force page, you don’t have to modify the page at all. You can simply add/remove the field from the fieldset.
Use Fieldset in Visualforce
Visualforce Page
How to dynamically query fields in Apex: We can use the dynamic SOQL to query the fields present in the fieldset. The schema namespace provides the metadata for the fieldset that can be used to build the dynamic SOQL query in Apex. This again gives you the advantage of selecting the fields based on the fieldset and would vary if you add/remove the fields in fieldset.
Dynamic SOQL query in Controller
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