Merge branch 'dia4'

Author: Cristina Taboada

RetosTema4/package-lock.json

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+{
+  "name": "retostema4",
+  "version": "1.0.0",
+  "description": "Retos del Tema 4 del Módulo 5 - BBDD relacionales MySQL",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Cristina Taboada Mayo",
+  "license": "ISC",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^4.18.2",
+    "mysql2": "^3.4.0"
+  }
+}

RetosTema4/package.json

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+const app = require("./app");
+
+app.listen(process.env.PORT || 3000);

RetosTema4/src/apiRest.js

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+const express = require("express");
+const cors = require("cors");
+const alumnosRouters = require("./routers/alumnos.routers");
+const notasRouters = require("./routers/notas.routers");
+const errorHandling = require("./error/errorHandling");
+
+const app = express();
+
+app.use(cors());
+app.use(express.urlencoded({extended:false}));
+app.use(express.json());
+app.use(alumnosRouters);
+app.use(notasRouters);
+app.use((req,res,next)=>{
+    res.status(404).json({
+        error: true,
+        codigo: 404,
+        mensaje: "Endpoint no encontrado"
+    });
+});
+app.use(errorHandling);
+
+module.exports = app;

RetosTema4/src/app.js

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+const {pool} = require("../database");
+
+async function getAlumnos(req,res){
+    const params = [req.query.id];
+    let sql;
+    //-- comprobar si existe una id de alumno. Si existe se pide ese alumno
+    //-- sino se piden todos.
+    if (req.query.id != undefined) {
+        sql = `SELECT * FROM students WHERE student_id=?`;
+    }else{
+        sql = `SELECT * FROM students;`;
+    }
+
+    //-- Envío de los datos optenidos por la petición.
+    try {
+        const [result] = await pool.query(sql,params);
+        res.send(result);
+    } catch (error) {
+        res.send(error)
+    }
+}
+
+async function addAlumno(req,res){
+    //-- Obtenemos los datos del nuevo alumno por el body.
+    const{student_id,first_name,last_name,group_id,year} = req.body;
+    //-- IMPORTANTE: Los parámetros deben ir colocados en el orden en el que se deben insertar en la
+    //-- peticion sql.
+    const params = [student_id,first_name,last_name,group_id,year];
+    let sql = `INSERT INTO students (student_id,first_name,last_name,group_id,year) VALUES (?,?,?,?,?);`;
+
+    try {
+        const [result] = await pool.query(sql,params);
+        res.send(result);
+    } catch (error) {
+        res.send(error)
+    }
+}
+
+async function editAlumno(req,res){
+    const{student_id,first_name,last_name,group_id,year} = req.body;
+    //-- IMPORTANTE: Los parámetros deben ir colocados en el orden en el que se deben insertar en la
+    //-- peticion sql.
+    const params = [
+        first_name? first_name: null,
+        last_name? last_name:   null,
+        group_id? group_id:     null,
+        year? year:             null,
+        student_id
+    ];
+    let sql = `UPDATE students SET first_name = COALESCE(?,first_name),
+                                    last_name = COALESCE(?,last_name),
+                                    group_id = COALESCE(?,group_id),
+                                    year = COALESCE(?,year)
+                                    WHERE student_id = ?;`;
+
+    try {
+        const [result] = await pool.query(sql,params);
+        res.send(result);
+    } catch (error) {
+        res.send(error)
+    }
+}
+
+async function delAlumno(req,res){
+    const {student_id} = req.body;
+    const params = [student_id];
+    let sql = `DELETE FROM students WHERE student_id = ?;`;
+
+    try {
+        const [result] = await pool.query(sql,params);
+        res.send(result);
+    } catch (error) {
+        res.send(error)
+    }
+}
+
+module.exports = { getAlumnos, addAlumno, editAlumno, delAlumno };

RetosTema4/src/controller/alumnos.controller.js

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+const {pool} = require("../database");
+
+async function getMedia(req,res){
+    const params = [req.query.id];
+    let sql;
+    //-- comprobar si existe una id de alumno. Si existe se pide ese alumno
+    //-- sino se piden todos.
+    if (req.query.id != undefined) {
+        sql = `SELECT AVG(mark) AS nota_media_del_Alumno FROM marks WHERE student_id=?`;
+    }
+
+    //-- Envío de los datos optenidos por la petición.
+    try {
+        const [result] = await pool.query(sql,params);
+        res.send(result);
+    } catch (error) {
+        res.send(error)
+    }
+}
+
+async function getAsignaturasAlumnos(req,res){
+    const params = [req.query.id];
+    let sql;
+    //-- comprobar si existe una id de alumno. Si existe se pide ese alumno
+    //-- sino se piden todos.
+    if (req.query.id != undefined) {
+        sql = `SELECT first_name, last_name, title FROM students AS s INNER JOIN subjects AS sub ON (s.group_id=sub.subject_id) WHERE student_id=?`;
+    }else{
+        sql = `SELECT first_name, last_name, title FROM students AS s INNER JOIN subjects AS sub ON (s.group_id=sub.subject_id);`;
+    }
+
+    //-- Envío de los datos optenidos por la petición.
+    try {
+        const [result] = await pool.query(sql,params);
+        res.send(result);
+    } catch (error) {
+        res.send(error)
+    }
+}
+
+async function getAsignaturasProfesores(req,res){
+    const params = [req.query.id];
+    let sql;
+    //-- comprobar si existe una id de alumno. Si existe se pide ese alumno
+    //-- sino se piden todos.
+    if (req.query.id != undefined) {
+        sql = `SELECT first_name AS teacher_name, last_name AS teacher_lastname, sub.title AS subjects FROM teachers AS t
+                JOIN subject_teacher AS st ON t.teacher_id=st.teacher_id
+                JOIN subjects AS sub ON st.subject_id=sub.subject_id
+                WHERE t.teacher_id = ?
+                GROUP BY first_name, last_name, sub.title;`;
+    }else{
+        sql = `SELECT first_name AS teacher_name, last_name AS teacher_lastname, sub.title AS subjects FROM teachers AS t
+                JOIN subject_teacher AS st ON t.teacher_id=st.teacher_id
+                JOIN subjects AS sub ON st.subject_id=sub.subject_id
+                GROUP BY first_name, last_name, sub.title;`;
+    }
+
+    //-- Envío de los datos optenidos por la petición.
+    try {
+        const [result] = await pool.query(sql,params);
+        res.send(result);
+    } catch (error) {
+        res.send(error)
+    }
+}
+
+module.exports = { getMedia, getAsignaturasAlumnos, getAsignaturasProfesores };

RetosTema4/src/controller/notas.controller.js

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+const mysql = require ("mysql2");
+
+const pool = mysql.createPool(
+    {
+        host:               "localhost",
+        user:               "root",
+        password:           "Secur3MyS4QL",
+        database:           "escuela",
+        waitForConnections: true,
+        connectionLimit:    10,
+        maxIdle:            10,
+        idleTimeout:        60000,
+        queueLimit:         0
+    }
+).promise();
+
+console.log("Conexión con la BBDD creada");
+
+module.exports = {pool};

RetosTema4/src/database.js

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+function errorHandling(err,req,res,next){
+    res.status(500).json({message: err.message});
+}
+module.exports = errorHandling;

RetosTema4/src/error/errorHandling.js

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+const { Router } = require("express");
+const router = Router();
+const alumnosCtrl = require("../controller/alumnos.controller");
+
+router.get('/alumnos', alumnosCtrl.getAlumnos);
+router.post('/alumnos', alumnosCtrl.addAlumno);
+router.put('/alumnos', alumnosCtrl.editAlumno);
+router.delete('/alumnos', alumnosCtrl.delAlumno);
+
+module.exports = router;

RetosTema4/src/routers/alumnos.routers.js

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+const { Router } = require("express");
+const router = Router();
+const notasCtrl = require("../controller/notas.controller");
+
+router.get('/media', notasCtrl.getMedia);
+router.get('/apuntadas', notasCtrl.getAsignaturasAlumnos);
+router.get('/impartidas', notasCtrl.getAsignaturasProfesores);
+
+module.exports = router;