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पिछले topic में आपने MongoDB connection बनाना सीखा , इस topic में सीखेंगे कि database में collection (table) कैसे बनाये हैं। MongoDB database में collection (table) बनाने के लिए createCollection("collection_name", callback) method का use किया जाता है।
// import MongoClient from mongodb package
const { MongoClient } = require('mongodb');
const uri = "mongodb+srv://user:pass@cluster0.2n7fz.mongodb.net/node_mongodb?retryWrites=true&w=majority";
const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true , connectTimeoutMS: 30000 , keepAlive: 1});
// make connection
client.connect(error => {
if(error){
console.log("MongoDB Connect Error", error.name, error.message);
}else{
// select database
const database = client.db("node_mongodb");
const users_collections = database.createCollection("users", (error, result) => {
if(error){
console.log("Error : ", error.name, error.message);
}else{
console.log("users collection created : ", result);
// close collection
client.close();
}
});
}
});C:\Users\HP\Desktop\workspace\nodejs>node app.js
users collection created : Collection {
s: {
db: Db { s: [Object] },
options: {
raw: false,
promoteLongs: true,
promoteValues: true,
promoteBuffers: false,
ignoreUndefined: false,
bsonRegExp: false,
serializeFunctions: false,
fieldsAsRaw: {},
enableUtf8Validation: true,
writeConcern: [WriteConcern],
readPreference: [ReadPreference]
},
namespace: MongoDBNamespace { db: 'node_mongodb', collection: 'users' },
pkFactory: { createPk: [Function: createPk] },
readPreference: ReadPreference {
mode: 'primary',
tags: undefined,
hedge: undefined,
maxStalenessSeconds: undefined,
minWireVersion: undefined
},
bsonOptions: {
raw: false,
promoteLongs: true,
promoteValues: true,
promoteBuffers: false,
ignoreUndefined: false,
bsonRegExp: false,
serializeFunctions: false,
fieldsAsRaw: {},
enableUtf8Validation: true
},
readConcern: undefined,
writeConcern: WriteConcern { w: 'majority' }
}
} Example run करें और अगर इसी से Output आता है तो collection create हो चुका है।
Note : MongoDB Database example के लिए हमने यह , पर Online MongoDB Cloud Services use किया है, आप चाहे तो आप database को local पर install करके use में ले सकते हैं।
listCollections() method का use करके आप , database में present सभी collections की listing भी कर सकते हैं।
const { MongoClient } = require('mongodb');
const uri = "mongodb+srv://user:pass@cluster0.2n7fz.mongodb.net/node_mongodb?retryWrites=true&w=majority";
const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true , connectTimeoutMS: 30000 , keepAlive: 1});
// make connection
client.connect(error => {
if(error){
console.log("MongoDB Connect Error", error.name, error.message);
}else{
// select database
const database = client.db("node_mongodb");
database.listCollections().toArray(function(err, collections) {
if(error){
console.log("MongoDB Error", error.name, error.message);
}else{
for(coll of collections){
console.log(coll.name)
}
}
});
}
});C:\Users\HP\Desktop\workspace\nodejs>node app.js users