Constructing Types

一、使用GraphQLObjectType 定义type（类型）

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二、使用GraphQLObjectType 定义Query（查询）

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三、创建schema

var schema = new graphql.GraphQLSchema({query: queryType});

const express = require('express');
const graphql = require('graphql');
const {graphqlHTTP} = require('express-graphql');


// 定义Schema,  查询方法和返回值类型
//const schema = buildSchema(`
//  type Account {
//      name: String
//      age: Int
//      sex: String
//      department: String
//      salary(city: String): Int
//  }
//  type Query {
//    getClassMates(classNo: Int!): [String]
//    account(username: String): Account
//  }
//`)

const AccountType = new graphql.GraphQLObjectType({
  name: 'Account',
  fields: {
    name: {type: graphql.GraphQLString},
    age: {type: graphql.GraphQLInt},
    sex: {type: graphql.GraphQLString},
    department: {type: graphql.GraphQLString}
  }
});

const queryType = new graphql.GraphQLObjectType({
  name: 'Query',
  fields: {
    account: {
      type: AccountType,
      args: {
        username: {type: graphql.GraphQLString}
      },
      resolve: function(_, {username}) {
        const name = username;
        const age = 19;
        const sex = '男';
        const department = '开发部';
        return {
          name,
          age,
          sex,
          department
        }
      }
    }
  }
});

const schema = new graphql.GraphQLSchema({query: queryType}); 

const app = express();

app.use('/graphql', graphqlHTTP({
    schema: schema,
    graphiql: true
}))

app.listen(3000);