Bsrhrki

I am Trying to write a dynamic SOQL Query with a nested query.

@AuraEnabled
public static List<Books__c> filterRecords(String bookNumber, String PDCN, String Brand, String Type)
 System.debug('bookNumber__c->'+bookNumber__c);
 System.debug('PDCN->'+PDCN);
 System.debug('Brand->'+Brand);

 String query = 'SELECT Id,Content__c,ForecastWeekIndicator__c,Generic_PDCN__c,isExpired__c, '+
 'BrandStandardName__c,DPForecast_BaseUnits__c,ForecastStatus__c,Generic_DateTime__c, '+
 'Type__c,OperationalForecast_BaseUnits__c,PackageStandardName__c,bookNumber__c__c '+
 'FROM Books__c WHERE Type__c =:Type '+
 'AND Id NOT IN (SELECT Books__c FROM User_Specific_Books__c '+ 
 'WHERE Books_Delete__c = TRUE AND User__c = : UserInfo.getUserId())';
 if(string.isNotEmpty(bookNumber__c) && bookNumber__c!=null)
 query = query + ' AND bookNumber__c__c =: bookNumber__c';
 
 if(string.isNotEmpty(PDCN) && PDCN != null)
 query = query + ' AND Generic_PDCN__c =: PDCN';
 
 if(string.isNotEmpty(Brand) && Brand != null)
 query = query + ' AND BrandStandardName__c =: Brand';
 
 System.debug('query--->'+query);
 List<Notification__c> lst;

 try
 lst = Database.query(query);
 system.debug('List--->'+lst);

 catch(Exception e)
 system.debug(e.getMessage());
 

 if(!lst.isEmpty())
 return lst;
 
 else
 return null;
 
}

and, I am getting exception expecting a right parentheses, found '('.
Any explanation would be appreciated.

You can't use actual Apex in dynamic queries. Only "simple" variables are allowed. The problem is in the following line.

 'WHERE Books_Delete__c = TRUE AND User__c = : UserInfo.getUserId())';

Assign the value to a variable first:

Id userId = UserInfo.getUserId();
...
 'WHERE Books_Delete__c = TRUE AND User__c = :userId)';

You can't use dot reference in dynamic query. Here is your problem:

'WHERE Books_Delete__c = TRUE AND User__c = : UserInfo.getUserId())'

You need to add some context variable to store the Id and then change it to:

'WHERE Books_Delete__c = TRUE AND User__c = :runningUserId'