[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Access generic pojo fields

Hello Fabian,

I am streaming my mongodb oplog using flink and want to use flink table API
to join multiple tables.  My code looks like

DataStream<Oplog> streamSource = env

StreamTableEnvironment tableEnv = TableEnvironment.getTableEnvironment(env);
// Convert the DataStream into a Table with default fields "f0", "f1"
Table table1 = tableEnv.fromDataStream(streamSource);

Table master = table1.filter("ns === 'Master'").select("o as master,
o.applicationId as primaryKey");
Table child1 = table1.filter("ns === 'Child1'").select("o  as child1,
o.applicationId as foreignKey");
Table child2 = table1.filter("ns === 'Child2'").select("o  as child2,
o.applicationId as foreignKey2");

Table result = master.join(child1).where("primaryKey==foreignKey").join(child2).where("primaryKey==foreignKey2");

it is throwing error "Method threw
'org.apache.flink.table.api.ValidationException' exception. Undefined

public class Oplog implements Serializable{
    private BasicDBObject o;

Where o is generic java type for fetching mongodb oplog and I can not
replace this generic type with static pojo's. please tell me any work
around on this.

BasicDBObject suffice following two rules


   The class must be public.

   It must have a public constructor without arguments (default constructor)

and we can access class members through basicDBObject.getString("abc")

*Amol Suryawanshi*
Java Developer

*iProgrammer Solutions Pvt. Ltd.*

*Office 103, 104, 1st Floor Pride Portal,Shivaji Housing Society,
Bahiratwadi,Near Hotel JW Marriott, Off Senapati Bapat Road, Pune - 411016,
MH, INDIA.**Phone: +91 9689077510 | Skype: amols_iprogrammer*
www.iprogrammer.com <sachin@xxxxxxxxxxxxxxx>