fix readme

README.md

 ## Project use nodejs version 15.0.1 and mysql in XAMPP##
 ## Generate data base ##
 ####
-execute query in file mysql.sql
+execute query in file mysql.sql.
 ####
 ## Install package ##
 ```npm install```

app/controller/products.js

+const ProductProvider = require('../provider/productProvider');
+const { sendOK, sendError } = require('../helper/response');
+class product {
+    constructor() {
+        this.producProvider = new ProductProvider()
+    }
+    init(router) {
+        const self = this;
+      
+        router
+            .route("")
+            .get(async function (req, res, next) {
+                await self.getProducts(req, res, next);
+
+            });
+        router
+            .route("/:code")
+            .get(async function (req, res, next) {
+                await self.getByCode(req, res, next);
+
+            });
+
+        router
+            .route("")
+            .post(async function (req, res, next) {
+                await self.createProduct(req, res, next);
+            });
+
+        router
+            .route("/:code")
+            .put(async function (req, res, next) {
+
+                await self.updateProduct(req, res, next);
+            });
+
+        router
+            .route("/:code")
+            .delete(async function (req, res, next) {
+
+                await self.deleteProduct(req, res, next);
+            });
+    }
+    async getProducts(req, res, next) {
+        const self = this;
+        try {
+
+            const currentPage = parseInt(req.query.page) || 1
+            const pageSize = parseInt(req.query.size) || 10
+            // sort & dir
+            let sort = req.query.sort || "id"
+            let dir = req.query.dir || "asc"
+            const lstResult = await self.producProvider.getAll(currentPage, pageSize, sort, dir);
+            lstResult['totalPages'] = Math.ceil(lstResult['count'] / pageSize);
+            lstResult['currentPage'] = currentPage
+            return res.status(200).json(sendOK(lstResult));
+        } catch (error) {
+            res.status(500).json(sendError(error.message))
+        }
+    }
+    async getByCode(req, res, next) {
+        const self = this;
+        try {
+            const result = await self.producProvider.getByCode(req.params);
+            return res.status(200).json(sendOK(result));
+        } catch (error) {
+            res.status(500).json(sendError(error.message))
+        }
+    }
+
+    async createProduct(req, res, next) {
+
+        const self = this;
+        try {
+            let body = req.body;
+            body.createdAt = new Date;
+
+            const result = await self.producProvider.post(body);
+            return res.status(200).json(sendOK(result));
+        } catch (error) {
+            res.status(500).json(sendError(error.message))
+        }
+    }
+
+    async updateProduct(req, res, next) {
+        const self = this;
+        try {
+            let body = req.body;
+            body.updatedAt = new Date;
+
+            const result = await self.producProvider.put(body, req.params.code);
+            if (result == 1)
+                return res.status(200).json(sendOK(result));
+            else
+                res.status(500).json(sendError("update fail"));
+        } catch (error) {
+     
+            res.status(500).json(sendError(error.message))
+        }
+
+    }
+
+    async deleteProduct(req, res, next) {
+        const self = this;
+        try {
+            const result = await self.producProvider.delete(req.params.code);
+            if (result == 1)
+                return res.status(200).json(sendOK(result));
+            else
+                res.status(500).json(sendError("delete fail"))
+
+        } catch (error) {
+   
+            res.status(500).json(sendError(error.message));
+        }
+
+    }
+}
+
+module.exports = product;
\ No newline at end of file