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index.js
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index.js
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// Dependencies
const inquirer = require ('inquirer');
const mysql = require ('mysql2');
const consTable = require ('console.table');
require('dotenv').config()
// Connection to database
const db = mysql.createConnection(
{
host: 'localhost',
user: 'root',
password: process.env.MYSQL_PASSWORD,
database: 'employee_db'
},
console.log('Connected to the employee_db database.')
);
db.connect(err => {
if (err) throw err;
console.log("Connected as Id" + db.threadId);
appWelcome();
});
// Welcoming to Employee Tracker App
function appWelcome() {
console.log("***********************************")
console.log("* *")
console.log("* EMPLOYEE TRACKER *")
console.log("* *")
console.log("***********************************")
promptUser();
}
// Asks the user with what operation wants to proceed
function promptUser() {
const choices = {
type: 'list',
message: 'What would you like to do?',
choices: ['View All Employees',
'View All Departments',
'View All Roles',
'Update Employee Role',
'Update Employee Manager',
'Add Employee',
'Add Role',
'Add Department',
'Delete Department',
'Delete Role',
'Delete Employee',
'Quit'],
name: 'userOperation',
}
inquirer.prompt(choices)
.then((answers) => {
switch (answers.userOperation) {
case 'View All Employees':
viewAllEmployees();
break;
case 'View All Departments':
viewAllDepartments();
break;
case 'View All Roles':
viewAllRoles();
break;
case 'Update Employee Role':
updateEmployee();
break;
case 'Update Employee Manager':
updateManager();
break;
case 'Add Employee':
addEmployee();
break;
case 'Add Role':
addRole();
break;
case 'Add Department':
addDepartment();
break;
case 'Delete Department':
deleteDepartment();
break;
case 'Delete Role':
deleteRole();
break;
case 'Delete Employee':
deleteEmployee();
break;
case 'Quit':
db.end();
break;
}
})
.catch(err => {
console.error(err);
});
}
// Shows all the employees in the database
function viewAllEmployees() {
const sqlQuery = `
SELECT employees.id,
employees.first_name,
employees.last_name,
roles.title,
departments.name AS department,
roles.salary,
CONCAT (manager.first_name, " ", manager.last_name) AS manager
FROM employees
LEFT JOIN roles ON employees.role_id = roles.id
LEFT JOIN departments ON roles.department_id = departments.id
LEFT JOIN employees manager ON employees.manager_id = manager.id`;
db.query(sqlQuery, function (err, results) {
if (err) throw err;
console.table(results);
promptUser();
});
}
// Shows all the roles in the database
function viewAllRoles() {
const sqlQuery = `
SELECT roles.id,
roles.title,
departments.name AS department,
roles.salary
FROM roles
LEFT JOIN departments ON roles.department_id = departments.id `;
db.query(sqlQuery, function (err, results) {
if (err) throw err;
console.table(results);
promptUser();
});
}
// Shows all the departments in the database
function viewAllDepartments() {
db.query(`SELECT * FROM departments`, function (err, results) {
if (err) throw err;
console.table(results);
promptUser();
});
}
// Adds a new employee to the database
function addEmployee() {
db.query("SELECT * FROM employees WHERE manager_id IS NULL", function (err, results) {
if (err) throw err;
const managerArray = [{
name: 'None',
value: 'NULL'
}];
for (let i = 0; i < results.length; i++) {
managerArray.push({
name: results[i].first_name + ' ' + results[i].last_name,
value: results[i].id
});
}
db.query("SELECT * FROM roles", function (err, results) {
if (err) throw err;
const roleArray = [];
for (let i = 0; i < results.length; i++) {
roleArray.push({
name: results[i].title,
value: results[i].id
});
}
let questions = [
{
type: 'input',
message: "What is the employee's first name?",
name: 'firstName',
},
{
type: 'input',
message: "What is the employee's last name?",
name: 'lastName',
},
{
type: 'list',
message: "What is the employee's role?",
choices: roleArray,
name: 'employeeRole'
},
{
type: 'list',
message: "Who is the employee's manager?",
choices: managerArray,
name: 'employeeManager'
}
]
inquirer.prompt(questions)
.then(answers => {
const sqlQuery = `
INSERT INTO employees (first_name, last_name, role_id, manager_id)
VALUES
('${answers.firstName}', '${answers.lastName}', ${answers.employeeRole}, ${answers.employeeManager})`;
db.query(sqlQuery, function (err, results) {
if (err) throw err;
console.log('New employee added.');
promptUser();
});
})
});
});
}
// Adds a new role to the database
function addRole () {
db.query("SELECT * FROM departments", function (err, results) {
if (err) throw err;
const departmentArray = [];
for (let i = 0; i < results.length; i++) {
let dept = {
name: results[i].name,
value: results[i].id
}
departmentArray.push(dept);
}
let questions = [{
type: 'input',
message: 'What is the name of the role?',
name: 'roleName'
},
{
type: 'input',
message: 'What is the salary of the role?',
name: 'roleSalary'
},
{
type: 'list',
message: 'Which department does the role belong to?',
choices: departmentArray,
name: 'roleDepartment'
}]
inquirer.prompt(questions)
.then(answers => {
db.query(`INSERT INTO roles (title, salary, department_id) VALUES ('${answers.roleName}', ${answers.roleSalary}, ${answers.roleDepartment})`, function (err, results) {
if (err) throw err;
console.log('New role added.');
promptUser();
});
})
});
}
// Adds a new department to the database
function addDepartment () {
inquirer.prompt ({
type: 'input',
message: 'What is the name of the department?',
name: 'departmentName'
})
.then(answers => {
db.query(`INSERT INTO departments (name) VALUES ('${answers.departmentName}');`, function (err, results) {
if (err) throw err;
console.log('New department added.');
promptUser();
});
})
}
// Updates information about an specific employee
function updateEmployee () {
db.query("SELECT * FROM employees", function (err, results) {
if (err) throw err;
const employeeArray = [];
for (let i = 0; i < results.length; i++) {
employeeArray.push({
name: results[i].first_name + ' ' + results[i].last_name,
value: results[i].id
});
}
db.query("SELECT * FROM roles", function (err, results) {
if (err) throw err;
const roleArray = [];
for (let i = 0; i < results.length; i++) {
roleArray.push({
name: results[i].title,
value: results[i].id
});
}
let questions = [
{
type: 'list',
message: "Which employee's role do you want to update?",
choices: employeeArray,
name: 'employeeUpdate'
},
{
type: 'list',
message: 'Which role do you want to assign the selected employee?',
choices: roleArray,
name: 'newRole'
}
]
inquirer.prompt(questions)
.then(answers => {
db.query(`UPDATE employees SET role_id = ${answers.newRole} WHERE id = ${answers.employeeUpdate}`, function (err, results) {
if (err) throw err;
console.table('Employee has been updated.');
promptUser();
});
})
});
});
}
// Updates an employe's manager
function updateManager() {
db.query("SELECT * FROM employees", function (err, results) {
if (err) throw err;
const employeeArray = [];
for (let i = 0; i < results.length; i++) {
employeeArray.push({
name: results[i].first_name + ' ' + results[i].last_name,
value: results[i].id
});
}
db.query("SELECT * FROM employees WHERE manager_id IS NULL", function (err, results) {
if (err) throw err;
const managerArray = [{
name: 'None',
value: 'NULL'
}];
for (let i = 0; i < results.length; i++) {
managerArray.push({
name: results[i].first_name + ' ' + results[i].last_name,
value: results[i].id
});
}
let questions = [
{
type: 'list',
message: "Which employee do you want to update?",
choices: employeeArray,
name: 'employeeUpdate'
},
{
type: 'list',
message: 'Which manager do you want to assign to the selected employee?',
choices: managerArray,
name: 'newManager'
}
]
inquirer.prompt(questions)
.then(answers => {
db.query(`UPDATE employees SET manager_id = ${answers.newManager} WHERE id = ${answers.employeeUpdate}`, function (err, results) {
if (err) throw err;
console.table(`Employee has been updated.`);
promptUser();
});
})
});
});
}
// Deletes selected department
function deleteDepartment() {
db.query("SELECT * FROM departments", function (err, results) {
if (err) throw err;
const deptArray = [];
for (let i = 0; i < results.length; i++) {
deptArray.push({
name: results[i].name,
value: results[i].id
});
}
inquirer.prompt ({
type: 'list',
message: 'What department do you want to delete?',
choices: deptArray,
name: 'departmentDeleted'
})
.then(answers => {
db.query(`DELETE FROM departments WHERE id = ${answers.departmentDeleted}`, function (err, results) {
if (err) throw err;
console.log('Department deleted.');
promptUser();
});
})
})
}
// Deletes selected role
function deleteRole() {
db.query("SELECT * FROM roles", function (err, results) {
if (err) throw err;
const roleArray = [];
for (let i = 0; i < results.length; i++) {
roleArray.push({
name: results[i].title,
value: results[i].id
});
}
inquirer.prompt ({
type: 'list',
message: 'Which role do you want to delete?',
choices: roleArray,
name: 'roleDeleted'
})
.then(answers => {
db.query(`DELETE FROM roles WHERE id = ${answers.roleDeleted}`, function (err, results) {
if (err) throw err;
console.log('Role deleted.');
promptUser();
});
})
})
}
// Deletes selected employee
function deleteEmployee() {
db.query("SELECT * FROM employees", function (err, results) {
if (err) throw err;
const employeeArray = [];
for (let i = 0; i < results.length; i++) {
employeeArray.push({
name: results[i].first_name + ' ' + results[i].last_name,
value: results[i].id
});
}
inquirer.prompt ({
type: 'list',
message: 'Which employee do you want to delete?',
choices: employeeArray,
name: 'employeeDeleted'
})
.then(answers => {
db.query(`DELETE FROM employees WHERE id = ${answers.employeeDeleted}`, function (err, results) {
if (err) throw err;
console.log('Employee deleted.');
promptUser();
});
})
})
}