0

Is there a way to make dynamic apex field references bind a reference to the fields? To illustrate the question, let's take the following example query:

String query = "SELECT myField__c FROM Account"
Database.query(query);

In the example, the field myField__c is not strongly referenced. This means you can delete the field from SFDC (without getting a field deletion prevention error stating what it's tied to) and blow up the apex next time the query is run.

I'm looking for a way to prevent the deletion of a field called out in a dynamic query (in this example: myfield__c) while still maintaining the dynamic referencing aspect of the query.

Obviously, if the following apex existed in a class somewhere, the system would give an error if someone tried to delete myfield__c from the Account object:

List<Account> accounts = [SELECT myfield__c FROM Account];

But I would like to prevent deletion of the field when myfield__c is referenced like so:

String query = "SELECT myField__c FROM Account"
Database.query(query);

Thanks in advance.

5

Absolutely you can. Just merge in strings that you build from SObjectField. I would recommend using String.join. Simple example:

List<String> fields = new List<String>
{
    String.valueOf(Account.MyField__c),
    String.valueOf(Account.OtherField__c)
};
Database.query('SELECT ' + String.join(fields, ',') + ' FROM Account');
  • That works, but it defeats the purpose of dynamic. – user3430245 Apr 4 '18 at 19:35
  • How does it defeat the purpose... you've given very little detail in your question. – Adrian Larson Apr 4 '18 at 20:13
1

You could use a dummy method to keep a solid reference:

public static void keepReference() {
  Object[] fields = new Object[] {
    Account.MyField__c, Account.MyOtherField__c
  };
}

Personally, I'd advise against using dynamic queries if you can help it, since they are inherently fragile. Dynamic queries should be considered a last resort.

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