The following is the example code:
/**
install mongodb --save-dev / cnpm install mongodb --save-dev
MongoClient = require('mongodb').MongoClient;
var url = 'mongodb://localhost:27017/test'; Address to connect to the database
3. Connect to the database
(url, function(err, db) {
});
4. Implement addition, modification and deletion
(url, function(err, db) {
('user').insertOne({'name':'zhangsan'},function(error,data){
})
});
*/
var http=require('http');
var ejs=require('ejs');
var MongoClient = require('mongodb').MongoClient; /*Introduce database MongoClient*/
var DBurl = 'mongodb://localhost:27017/userDb'; // The address of the connection database student represents the name of the database
var url=require('url'); /*Introduce url module*/
var app=require('./model/');
(app).listen(3000);
('/',function(req,res){
var msg='This is the data of the database'
('views/',{msg:msg},function(err,data){
(data);
})
})
('/add',function(req,res){
//Add data
(DBurl,function(err,db){ /*Connect the database*/
if(err){
(err);
('Database connection failed');
return;
}
//Add data
('user').insertOne({
"name":"loaderman",
"age":10
},function(error,result){
if(error){
('Increasing data failed');
return;
}
('Add data successfully');
();/*Close the database*/
})
})
})
('/edit',function(req,res){
//Add data
//('The data is modified successfully');
(DBurl,function(err,db){
if(err){
(err);
('Database connection failed');
return;
}
('user').updateOne({"name":"loaderman"},{$set:{
"age":666
}},function(error,data){
if(error){
('Failed to modify data');
return;
}
(data);
('The data is modified successfully');
();/*Close the database*/
})
})
})
('/delete',function(req,res){
//Add data //delete?name=lisi
//((,true));
var query=(,true).query;
//();
var name=;
(DBurl,function(err,db){
if(err){
(err);
('Database connection failed');
return;
}
('user').deleteOne({"name":name},function(error,data){
if(error){
('Delete failed');
return;
}
(data);
('Delete data successfully');
();
})
})
})
('/query',function(req,res){
(DBurl,function(err,db){
if(err){
('Connecting to the database failed');
return;
}
//Query data var list=[]; /*Stack all data in the database*/
var result=('user').find({});
(function(error,doc){
//(doc);
if(error){
(error);
}else{
if(doc!=null){
(doc);
}else{ /*doc==null means that the data loop is completed*/
/*After getting data*/
//(list);
('views/',{list:list},function(err,data){
(data);
})
}
}
})
//(result);
})
})
Insert data
/**
* Insert a single piece of data
* @param table_name table name
* @param insertData Inserted Data
* @param callback method
*/
= function (table_name, insertData , callback) {
var node_model = (table_name);
node_model.insertOne(insertData , function (err, res) {
if (err) {
callback(err);
} else {
callback(null, res);
}
});
};
Query data
/**
* Query a single piece of data
* @param table_name table name
* @param conditions Query conditions
* @param callback method
*/
= function (table_name, conditions, callback) {
var node_model = (table_name);
node_model.findOne(conditions, function (err, res) {
if (err) {
callback(err);
} else {
callback(null, res);
}
});
};
Update data
/**
* Update single data
* @param table_name table name
* @param conditions Query conditions {"name":'jackson Yingqi'};
* @param updateStr Update data {$set: { "url" : "/jackson-zhangjiang" }};
* @param callback method
*/
= function (table_name, conditions，updateStr , callback) {
var node_model = (table_name);
node_model.updateOne(conditions，updateStr, function (err, res) {
if (err) {
callback(err);
} else {
callback(null, res);
}
});
};
The above are all the relevant knowledge points introduced this time. Thank you for your study. If you have any additional information, you can contact the editor.