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server.js
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server.js
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const express = require('express');
const cors = require('cors');
const graphqlHTTP = require('express-graphql');
const { buildSchema } = require('graphql');
const MongoClient = require('mongodb').MongoClient;
const assert = require('assert');
/** 接続URL */
const url = 'mongodb://localhost:27017';
/** データベース名 */
const dbName = 'myDB';
/** Create */
const insertDocuments = (db) => {
/** collectionを取得 */
const collection = db.collection('myCollection');
/** collectionにdocumentを追加 */
collection.insertMany(
[{ name: 'Dan', age: 18 }, { name: 'Bob', age: 22 }, { name: 'John', age: 30 }],
(err, result) => {
assert.equal(err, null);
assert.equal(3, result.result.n);
assert.equal(3, result.ops.length);
console.log('Inserted 3 documents into the collection');
},
);
};
/** Read */
const findDocuments = (db) => {
/** collectionを取得 */
const collection = db.collection('myCollection');
/** documentを検索(ageが20以上のdocumentのnameを取得) */
collection
.find({})
.project({ name: 1 })
.toArray((err, docs) => {
assert.equal(err, null);
console.log('Found the following records');
console.log(docs);
});
};
/** Update */
const updateDocument = (db) => {
/** collectionを取得 */
const collection = db.collection('myCollection');
/** documentを更新(ageが19以下のdocumentに{ status: false }を追加) */
collection.updateMany({ age: { $lt: 20 } }, { $set: { status: false } }, (err, result) => {
assert.equal(err, null);
assert.equal(1, result.result.n);
console.log('Updated the document with the field a equal to 2');
});
};
/** Delete */
const removeDocument = (db) => {
/** collectionを取得 */
const collection = db.collection('myCollection');
/** documentを削除(statusがfalseのdocuentを削除) */
collection.deleteMany({ status: false }, (err, result) => {
assert.equal(err, null);
assert.equal(1, result.result.n);
console.log('Removed the document with the field a equal to 3');
});
};
/** indexes */
const indexCollection = (db) => {
db.collection('myCollection').createIndex({ name: 1 }, null, (err, results) => {});
};
(async function() {
let client;
try {
/** DBサーバーに接続 */
client = await MongoClient.connect(
url,
{ useNewUrlParser: true },
);
/** DBを取得 */
const db = client.db(dbName);
await insertDocuments(db);
await indexCollection(db);
await updateDocument(db);
await findDocuments(db);
await removeDocument(db);
await findDocuments(db);
} catch (err) {
console.log(err.stack);
}
/** DBサーバーとの接続解除 */
client.close();
})();
let data = require('./data.json');
const schema = buildSchema(`
type Query {
getUser(index: ID!): User
}
type Mutation {
createUser(userInput: UserInput): User
}
type User {
id: ID
name: String
age: Int
}
input UserInput {
name: String
age: Int
}
`);
const root = {
getUser(root) {
return data[root.index];
},
createUser({ userInput }) {
const id = String(Object.keys(data).length + 1);
data = {
...data,
[id]: {
id,
name: userInput.name,
age: userInput.age,
},
};
console.log(data);
},
};
const app = express();
app.use(cors());
app.use(
'/graphql',
graphqlHTTP({
schema: schema,
rootValue: root,
graphiql: true,
}),
);
app.listen(4000, () => console.log('Now browse to localhost:4000/graphql'));