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ManojKumar MuthuManojKumar Muthu 

system.QueryException

Here I am trying to get value dynamically from few different fields include, Account, Status, Tracker, Priority, ContactEmail and list down the list of case that matchs the criteria.

When I execute the below code I am getting  system.QueryException: invalid ID field: null

@RestResource(urlMapping='/QueryFilterStatus/*')
global with sharing class QueryFilterStatus{
    
    @HttpPost
    global static List<Case> dopostCase(String accountid,String tracker,String priority,String contactEmail,String status,String CStatus,String subject, String Keyword, String accid) {
    List<Case> caseList = new List<Case>();
    String str='Select id, Case_Owner_Name__c, OwneEmail__c, Description, Subject, Case_Type__c, Code__c, Tracker__c, status, Version__c, type, priority, ContactEmail, ContactId, OwnerId, CaseNumber, CSM_ID__c, CUP_Phone__c, Call_Type__c, IsClosed from Case where accountid =\''+ null +'\'';
    
    if(String.isBlank(accid))
    {
       str+=' AND AccountId=\''+ accid+'\'';
    }
    if(String.isNotBlank(tracker))
    {
       str+=' AND Tracker__c =\''+ tracker+'\'';
    }
     if(String.isNotBlank(priority))
    {
       str+=' AND Priority=\''+ priority+'\'';
    }
     if(String.isNotBlank(contactEmail))
    {
       str+=' AND ContactEmail=\''+ contactEmail+'\'';
    }
     if(String.isNotBlank(status))
    {
       str+=' AND Status =\''+ status+'\'';
    }
    
    if(String.isNotBlank(CStatus))
    {
       str+=' AND CStatus__c=\''+ CStatus+'\'';
    }
    if(String.isNotBlank(Keyword))
   {
      str+=' AND (Subject Like\''+ Keyword+'\'';
      str+=' OR CaseNumber Like \'%'+ Keyword+'%\')';
   }  
   System.debug(str);
    caseList=Database.query(str);
    return caseList;
    
    
}
}
edanna kedanna k
Dear ManojKumar Muthu,

Please change method from String.isBlank(accid) to String.isNotBlank(accid)
if(String.isNotBlank(accid))
    {
       str+=' AND AccountId=\''+ accid+'\'';
    }

Please let me know if it helps!