Mac1

README.md

@@ -19,3 +19,6 @@ Algorithm Library started in this project
 ## May-7 (Tue), 2019
 Decided to start the project
 * go.storeformula.com
+
+## Markup 
+https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet

connect-database/connect-db.js

@@ -1,4 +1,5 @@
 // How to run : $ node .\connect-db.js
+// make sure if port is correct (windows=5433, mac=5432)
 var Pool = require('pg').Pool;
 var config = {
     host: 'localhost',

connect-database/connect-db.sql

@@ -44,3 +44,24 @@ insert into students(firstname,lastname, country) values
     ('Simon','Park', 'South Korea'),
     ('Cindy','Kwon', 'North Korea')
 ;
+
+
+/************************************
+ 4) basic command after connection (In Mac)
+************************************/
+
+Simons-Air:bin simonpark$ psql -U postgres -p 5432
+password: connect
+
+--  list DB
+postgres-# \l
+
+-- connect DB
+postgres-# \c {school}
+
+-- list tables
+school-# \dt
+
+-- quit DB
+school-# \q
+

connect-service/cis_service.js

@@ -7,7 +7,7 @@ const express = require('express'),
 
 const morgan = require('morgan')
 const router = require('./db_query');
-const bodyParser = require('body-parser')
+// const bodyParser = require('body-parser')
 
 app.use(function(req, res, next) {
   res.header("Access-Control-Allow-Origin", "*");
@@ -17,8 +17,10 @@ app.use(function(req, res, next) {
 });
 
 app.use(morgan('combined')) // combined , short
-app.use(bodyParser.urlencoded({ extended: false }));
-app.use(bodyParser.json());
+// app.use(bodyParser.urlencoded({ extended: true }));
+// app.use(bodyParser.json());
+app.use(express.urlencoded({extended:false}))
+app.use(express.json())
 app.use(router)
 
 

connect-service/db_query.js

@@ -2,13 +2,14 @@ const express = require('express')
 var pool = require('pg').Pool;
 const router = express.Router()
 
+// make sure if port is correct (windows=5433, mac=5432)
 function getConnection(){
     return pool({
         host: 'localhost',
         user: 'mycampus',
         password: 'mycampus',
         database: 'school',
-        port: '5433',
+        port: '5432',
         connectionList: 10
 
     })

database/mongo/mongo.js → database/mongo/mongo-command.md

@@ -1,55 +1,35 @@
-// https://www.tutorialspoint.com/mongodb/
 
-// 1) Show DB Systems
-//show dbs
+[mong DB manual](https://docs.mongodb.com/manual/reference/method/db.createUser/)
 
-// admin                              0.000GB
-// config                             0.000GB
-// local                              0.000GB
-// node-mongo-registration-login-api  0.000GB
+1) Create Collection
 
-// 2) Switch to the DB
-//use mycustomers
-
-// switched to db mycustomers
- db
-// mycustomers
-
-// 3) Create User
-// db.createUser({
-// ... user:"simon",
-// ... pwd:"1234",
-// ...  roles: [ "readWrite", "dbAdmin" ]
-// ... });
-// https://docs.mongodb.com/manual/reference/method/db.createUser/
-
-// Successfully added user: { "user" : "simon", "roles" : [ "readWrite", "dbAdmin" ] }
-
-// 4) Create Collection
+```
 db.createCollection('customers');
 // { "ok" : 1 }
+```
 
-// 5) Show Collections
-// show collections
-
-// customers
+2) Show Collections
 
+```
 db.customers.insert({first_name:"John",last_name:"Doe"});
 // WriteResult({ "nInserted" : 1 })
+```
 
+3) search Document
+```
 db.customers.find();
 // { "_id" : ObjectId("5c06ec2a49f099d2326ecad1"), "first_name" : "John", "last_name" : "Doe" }
+```
 
-db.customers.find();
-// { "_id" : ObjectId("5c06ec2a49f099d2326ecad1"), "first_name" : "John", "last_name" : "Doe" }
-
-//show collections
-// customers
-// people
+```
 db.people.find();
 // { "_id" : ObjectId("5c06ec582a88942510eb20ae"), "firstname" : "John", "lastname" : "Doe", "address" : "330 Bay St. Toronto", "__v" : 0 }
 // { "_id" : ObjectId("5c06ec582a88942510eb20af"), "firstname" : "Jane", "lastname" : "Doe", "address" : "555 Main St.", "__v" : 0 }
+```
+4) insert Document
+```
 db.customers.insert([{first_name:"Steve", last_name:"Simth"},{first_name:"John",last_name:"Johnson",gender:"female"}]);
+
 // BulkWriteResult({
 //         "writeErrors" : [ ],
 //         "writeConcernErrors" : [ ],
@@ -60,10 +40,13 @@ db.customers.insert([{first_name:"Steve", last_name:"Simth"},{first_name:"John",
 //         "nRemoved" : 0,
 //         "upserted" : [ ]
 // })
+
+```
+
+5) Examples
+```
+
 db.customers.find();
-// { "_id" : ObjectId("5c06ec2a49f099d2326ecad1"), "first_name" : "John", "last_name" : "Doe" }
-// { "_id" : ObjectId("5c06ed5749f099d2326ecad2"), "first_name" : "Steve", "last_name" : "Simth" }
-// { "_id" : ObjectId("5c06ed5749f099d2326ecad3"), "first_name" : "John", "last_name" : "Johnson", "gender" : "female" }
 db.customers.find().pretty();
 db.customers.find().sort({last_name:1});  // ascending
 db.customers.find().sort({last_name:-1}); // descending
@@ -91,5 +74,4 @@ db.customers.find({first_name:"Steve"});
 db.customers.find({$or:[{first_name:"Steve"},{last_name:"Doe"}]});
 
 db.customers.find({"address.city":"Boston"});
-
-
+```

database/mongo/mongo-general.md

@@ -0,0 +1,39 @@
+# start mongo DB
+
+1) start deamon
+```
+$ cd ~/Documents/dev/mongodb-4.0/bin
+$ ./mongod
+```
+2) start mongo
+```
+$ ./mongo
+> show dbs                     # 
+> use {db_name}                # 
+> show collections             # 
+> db.{collection_name}.find()  #
+
+```
+
+ 3) Create User
+ ```sql
+ db.createUser({
+ user:"simon",
+ pwd:"1234",
+  roles: [ "readWrite", "dbAdmin" ]
+ });
+
+```
+
+4) MongoDB Compass
+
+```
+mongodb://localhost:27017
+```
+
+# reference
+[mongo DB manual](https://docs.mongodb.com/manual/reference/method/db.createUser/)
+
+[mongoose](https://mongoosejs.com/)
+
+[Tutorial Point](https://www.tutorialspoint.com/mongodb/mongodb_delete_document.htm)

database/mongo/server.js

@@ -0,0 +1,81 @@
+// how to run : nodemon server.js
+// Node.js (Mongo DB) Tutorial # 9 / 10
+// https://www.youtube.com/watch?v=bxsemcrY4gQ
+// https://www.youtube.com/watch?v=VVGgacjzc2Y
+
+const mongoose = require('mongoose');
+
+var express = require('express'),
+  app = express(),
+  port = process.env.PORT || 8080;
+
+// 1) DB connect
+mongoose.connect('mongodb://localhost/cis',{
+    useNewUrlParser: true,
+    useUnifiedTopology: true
+})
+
+mongoose.connection.on('connected', () => {
+    console.log('Mongo DB connected')
+});
+
+// 2) DB schema
+const studentSchema = new mongoose.Schema({
+    firstName: String,
+    lastName: String,
+    staff: String,
+})
+
+
+// 3) DB model
+const studentModel = mongoose.model('student',studentSchema);
+
+app.use(express.json());
+app.use(express.urlencoded({extended:false}));
+
+app.get('/students', (req, res) => {
+    try{
+        console.log('main workflow:');
+        studentModel.find()
+            .then((result) => {
+                console.log(result);
+                res.send(result);
+            })
+            .catch((err) => console.log(err));
+    } catch(err) {
+        console.log('Internal Error:', error);
+    }
+    //Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
+    // res.json() 
+});
+
+app.post('/add', (req, res) => {
+    const data = {
+        firstName: req.body.firstName,
+        lastName: req.body.lastName,
+        staff: req.body.staff
+    };
+    const newStudent = new studentModel(data);
+
+    try {
+        newStudent.save((error) => {
+            if (error) {
+                res.status(500).json({ msg: 'Sorry, internal server errors' });
+                return;
+            }
+            console.log('your data has been saved');
+            return res.json({
+                msg: 'Your data has been saved!!!!!!'
+            });
+        });
+
+    } catch(err){
+        console.error(err.message);
+    }
+});
+
+// Run service
+app.listen(port, () => {
+    console.log('Mongo DB started on: ' + port);
+});
+

database/mongo/version1/server1.js

@@ -0,0 +1,59 @@
+// how to run : nodemon server.js
+
+const express = require('express');
+const mongoose = require('mongoose');
+
+const app = express();
+const port = process.env.PORT || 8080;
+
+mongoose.connect('mongodb://localhost/mern',{
+    useNewUrlParser: true,
+    useUnifiedTopology: true
+})
+
+mongoose.connection.on('connected', () => {
+    console.log('Mongo DB connected')
+});
+
+// schema
+const schema = mongoose.Schema;
+const blogSchema = new mongoose.Schema({
+    title: String,
+    body: String,
+    date: {
+        type: String,
+        default: Date.now()
+    }
+})
+
+
+// model
+const blogPost = mongoose.model('blogPost',blogSchema);
+
+const data = {
+    title: "Welcome",
+    body: "Help folks.."
+};
+
+const newBlogPost = new blogPost(data);
+newBlogPost.save((error) => {
+    if(error) {
+        console.log('error');
+    } else {
+        console.log('saved')
+    }
+});
+
+
+app.get('/api', (req, res) => {
+    const data = {
+        username: 'simonpark',
+        age: 5
+    };
+    res.json(data);
+})
+
+app.listen(port, () => {
+    console.log('Mongo DB started on: ' + port);
+});
+