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Completely master the addition, deletion, modification and query functions of nodejs operating mongodb
Completely master the addition, deletion, modification and query functions of nodejs operating mongodb
This article mainly introduces the addition, deletion, modification and query functions of nodejs operating mongodb. It briefly analyzes the installation of the mongodb module and analyzes the related implementation skills of nodejs operating mongodb database for addition, deletion, modification and query in the form of examples. Friends who need it can refer to it. I hope Can help everyone.
Install related modules
If you use this, you need to install the required modules yourself first and enter
in the root directorynpm install mongodb --save
Install the module. After the installation is successful, you can proceed with the following steps.
Introduction of files
The following is the relevant code I wrote, put it in the relevant directory that you can quote, I put it in the root of express Directory
function Mongo(options) {
this.settings = {
url: 'mongodb://localhost:27017/jk',
MongoClient:require('mongodb').MongoClient,
assert:require('assert')
};
for(let i in options){
this.settings[i] = options[i];
}
this._run = function (fun) {
let that = this;
let settings = this.settings;
this.settings.MongoClient.connect(this.settings.url, function (err, db) {
settings.assert.equal(null, err);
console.log("Connected correctly to server");
fun(db, function () {
db.close();
});
});
};
this.insert = function (collectionName, data, func) {
//增加数据
let insertDocuments = function (db, callback) {
let collection = db.collection(collectionName);
collection.insertMany([
data
], function (err, result) {
if (!err) {
func(true);
} else {
func(false);
}
callback(result);
});
};
this._run(insertDocuments);
};
this.update = function (collectionName, updateData, data, func) {
//更新数据
let updateDocument = function (db, callback) {
let collection = db.collection(collectionName);
collection.updateOne(updateData
, {$set: data}, function (err, result) {
if (!err) {
func(true);
} else {
func(false);
}
callback(result);
});
};
this._run(updateDocument);
};
this.delete = function (collectionName, data, func) {
//删除数据
let deleteDocument = function (db, callback) {
let collection = db.collection(collectionName);
collection.deleteOne(data, function (err, result) {
if (!err) {
func(true);
} else {
func(false);
}
callback(result);
});
};
this._run(deleteDocument);
};
this.find = function (collectionName, data, func) {
//查找数据
let findDocuments = function (db, callback) {
// Get the documents collection
let collection = db.collection(collectionName);
// Find some documents
collection.find(data).toArray(function (err, docs) {
if (!err) {
func(true,docs);
}
else {
func(false, err);
}
callback(docs);
});
};
this._run(findDocuments);
};
}
module.exports = Mongo;I saved it to a file named server.js
Use
We first introduce the module when we need to use the page. For example, I introduce it in the routing file index.js:
##
const Server = require("../server.js");let server = new Server();
let server = new Server({url:"mongodb://localhost:27017/mydb"});Add method
server.insert(数据表名,需要插入的数据（键值对的对象）,回调函数);
Update method
server.update(数据表名,查询的数据（对象）,更新的数据（对象）,回调函数);
Delete method
server.delete(数据表名,查询的数据（对象）,回调函数);
Search method
server.find(数据表名,查询的数据（对象）,回调函数);
Use case
For example, I If I need to find data in a route, I need this:server.find("users",{username:"username"},function (bool,data) {
if(bool){
console.log("查询到数据为"+data.length+"条");
}
else{
console.log(data);
}
});
});php database add, delete, modify and query methods
AngularJs add, delete, modify and query methods
Implementation of the basic writing method of adding, deleting, modifying and querying MySql in NodeJS
The above is the detailed content of Completely master the addition, deletion, modification and query functions of nodejs operating mongodb. For more information, please follow other related articles on the PHP Chinese website!
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