Why this code is returning null?

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Johirul Islam

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Nov 3, 2016, 3:10:26 PM11/3/16

to graphql-java

package query.graphql;

import com.mongodb.BasicDBObject;

import com.mongodb.DB;

import com.mongodb.DBCollection;

import com.mongodb.DBCursor;

import com.mongodb.DBObject;

import com.mongodb.Mongo;

import com.mongodb.MongoClient;

import graphql.schema.DataFetcher;

import java.util.Map;

import graphql.GraphQL;

import static graphql.Scalars.GraphQLString;

import static graphql.Scalars.GraphQLInt;

import static graphql.schema.GraphQLFieldDefinition.newFieldDefinition;

import static graphql.schema.GraphQLObjectType.newObject;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

import graphql.schema.DataFetcher;

import graphql.schema.DataFetchingEnvironment;

import graphql.schema.GraphQLList;

import graphql.schema.GraphQLObjectType;

import graphql.schema.GraphQLSchema;

public class GraphQLAccident {

public static void main(String[] args) {

GraphQLObjectType accident=newObject().name("Accidents").

field(newFieldDefinition().name("STATE").dataFetcher(new DataFetcher() {

@Override

public Object get(DataFetchingEnvironment env) {

return ((Accident)env.getSource()).STATE;

}})

.type(GraphQLInt).build())

.field(newFieldDefinition().name("VE_TOTAL").dataFetcher(new DataFetcher() {

@Override

public Object get(DataFetchingEnvironment env) {

return ((Accident)env.getSource()).VE_TOTAL;

}

}).type(GraphQLInt).build()).build();

GraphQLObjectType query=newObject().name("allAccidents")

.field(newFieldDefinition().name("AllAccidents").dataFetcher(new DataFetcher() {

@Override

public Object get(DataFetchingEnvironment env) {

//GraphQLList gl=new GraphQLList(accident);

MongoClient mongo = new MongoClient("localhost",27017);

DB db=mongo.getDB("Accidents2015");

DBCollection collection= db.getCollection("accidents");

BasicDBObject searchkey=new BasicDBObject();

searchkey.put("STATE", 1);

DBCursor cur=collection.find(searchkey);

Accident ac;

List<Accident> list=new ArrayList<Accident>();

while(cur.hasNext())

{

ac=new Accident();

DBObject dob=cur.next();

ac.STATE=(int)dob.get("STATE");

ac.VE_TOTAL=(int)dob.get("VE_TOTAL");

list.add(ac);

}

return list;

}

}).type(new GraphQLList(accident)).build()).build();

GraphQLSchema schema = GraphQLSchema.newSchema().query(query).build();

Map<String, Object> result = (Map<String, Object>)new GraphQL(schema).execute("{}").getData();

System.out.println(result);

}

private static class Accident {

public int STATE;

public int VE_TOTAL;

public int getSTATE() {

return STATE;

}

public void setSTATE(int sTATE) {

STATE = sTATE;

}

public int getVE_TOTAL() {

return VE_TOTAL;

}

public void setVE_TOTAL(int vE_TOTAL) {

VE_TOTAL = vE_TOTAL;

}

I am trying to get a list of accidents from this code. But its just returning null to me.