Hi everyone, 

I am trying to build a dynamic SOQL Query and I am getting this error. If any of you can help, I'd be very thankful. 
Here is the code
 

SObjectType objToken = Schema.getGlobalDescribe().get('AC__c');
system.debug('<<<! objToken'+objtoken);
       DescribeSObjectResult objDef = objToken.getDescribe();
       Map<String, SObjectField> fields = objDef.fields.getMap(); 
system.debug('<<<!!!! fields'+fields);
       AC__c newline = new AC__c();

		newline.Is_it_for_Commercial_Use__c   = 'No';
		newLine.Movement_Type__c = 'Import';
		String var='';
	List<SObjectField> sfield = fields.values();

	for(sobjectfield c: sfield){
       
        var+=c+',';
    }
var = var.removeEnd(',');
String q = 'Select '+var+' FROM AC__c WHERE ID=\'' + 'a00r000000164eq' + '\'';

//ID=\'' + varID + '\''
system.debug('<<!!! AC Fields'+q);

List<sObject> sobjList = Database.query(q);
system.debug(' <<<!!! sobjList ACCCCCCCC'+sobjList);
system.debug('AC size '+sobjlist.size());




SObjectType objDM = Schema.getGlobalDescribe().get('Regulations_Association_Matrix__c');
       system.debug('<<< objDM'+objDM);
DescribeSObjectResult objDeff = objDM.getDescribe();
Map<String, SObjectField> DMfields = objDeff.fields.getMap(); 

system.debug('<<<<<<<<<DM Fields'+DMFields);
      // AC__c newline = new AC__c();
		//newline.Is_it_for_Commercial_Use__c   = 'No';
		String var2='';
	List<SObjectField> sfielddm = DMfields.values();

	for(sobjectfield c: sfielddm){
       
        var2+=c+',';
    }
var2 = var2.removeEnd(',');

system.debug('var2'+var2);
String[] varlist = var2.split(',');
system.debug('((((((((((((( varlist'+varlist);
String dmm = 'Select '+var2+' FROM Regulations_Association_Matrix__c';
system.debug('<<!!! DM Fields'+dmm);

List<sObject> sobjListDM = Database.query(dmm);
system.debug('<<<!!!! SobjListDMMMMMMMMMM'+SobjListDM);
system.debug('DM size '+sobjlistDM.size());

List<String> fingers = new List<String>();
List<SObjectField> lop = new List<SobjectField>();
String str='';
string first='';
Map<String, SObjectField> finalmap = new Map<String, SObjectField>();

    for (String d: varlist){
        if(fields.containsKey(d))
        { 	
            system.debug('@@@@@@@@d'+d);
            fingers.add(d);
            finalmap.put(d,fields.get(d));
         }
        
        for(sobjectfield s: finalmap.values()){
            lop.add(s);
        }
        
    }

	for(sobjectfield md: lop){
            str+=+'('+md+' = :'+newline+'.'+md+' OR '+md+' = '+'\'\'   '+');'+' AND ';
            
        } 
    
system.debug('<<<<<<<!!!!!!!!!!!! str '+str);
String kjax = 'Select '+var2+' FROM Regulations_Association_Matrix__c WHERE '+str;
system.debug('<<<! kjax'+kjax);

List<sObject> dmlist = Database.query(kjax);

Everything works fine. Even the Query string I formed in 'kjax' variable is also what I wanted. 

But when I execute, I am getting the error 

System.QueryException: unexpected token: ':' 

When I remove the ':'  , Iam getting this error

System.QueryException: expecting a colon, found 'AC__c' 


Can you guys guide me as to where am I going wrong on this. Would be really grateful


Thanks
Nitish