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db.go
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db.go
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package main
import (
"log"
"os"
pg "github.com/go-pg/pg"
"github.com/go-pg/pg/orm"
)
//Schema for the local db, email will be the pk for each tuple
//first letter of each attribute HAS to be capitalized
type userDetail struct {
Email string `sql:"email,pk"`
Password string `sql:"password"`
FirstName string `sql:"firstName"`
LastName string `sql:"lastName"`
}
//Schema that doesn't include password
type userDetailNoPassword struct {
Email string `sql:"email,pk" json:"email"`
FirstName string `sql:"firstName" json:"firstName"`
LastName string `sql:"lastName" json:"lastName"`
}
/*
ConnectDB()
This function connects the program to a local db and create a schema based on the userDetail struct.
The schema will only be created once if the table already exists.
IMPORTANT:
1. change the user and password attribute when testing this program
2. must have a database called "users" OR change the Database attribute as well.
*/
func connectDB() (dbRef *pg.DB) {
opts := &pg.Options{
User: "", //TODO: Change
Password: "", //TODO: Change
Database: "users",
}
//establishing a connection with the local db
var db = pg.Connect(opts)
if db == nil {
log.Printf("Failed to connect to db\n")
os.Exit(100)
}
log.Printf("Successuflly connected to the db \n")
//creating a table using the userDetal schema
err := createTable(db)
if err != nil {
log.Printf("Failed to create tavke %v\n", err)
os.Exit(100)
}
return db
}
/*
closeDB()
This function ensures that the db connection is properly closed after the program intereacts
with the db
IMPORTANT:
1. change the user and password attribute when testing this program
2. must have a database called "users" OR change the Database attribute as well.
*/
func closeDB() {
opts := &pg.Options{
User: "", //TODO: Change
Password: "", //TODO: Change
Database: "users",
}
var db = pg.Connect(opts)
closeERR := db.Close()
if closeERR != nil {
log.Printf("Error close the connection. \n")
os.Exit(100)
}
log.Printf("Successfully closed the connection \n")
}
/*
createTable()
create a table using the userDetail schema
*/
func createTable(db *pg.DB) error {
opts := &orm.CreateTableOptions{
IfNotExists: true,
}
Err := db.CreateTable(&userDetail{}, opts)
if Err != nil {
log.Printf("Error while creating table %v", Err)
return Err
}
log.Printf("Everything is fine")
return nil
}
/*
insertUser()
insert a user into the local db when PostSignup is called
*/
func (u *userDetail) insertUser(db *pg.DB) error {
Err := db.Insert(u)
if Err != nil {
log.Printf("Error inserting into the table. Error: %v", Err)
return Err
}
log.Printf("User %s inserted\n", u.FirstName)
return nil
}
/*
findUser()
return a userDetail struct when given a user email
*/
func (u *loginInfo) findUser(db *pg.DB) *userDetail {
user := userDetail{
Email: u.Email,
}
//select using the user's primary key while populating data into the
//userDetail struct
Err := db.Select(&user)
if Err != nil {
log.Printf("Error finding the user. Error: %v", Err)
return nil
}
return &user
}
/*
findUser()
return a userDetail struct when given a user email
*/
func verifyUser(e string, p string, db *pg.DB) interface{} {
user := userDetail{
Email: e,
}
//select using the user's primary key while populating data into the
//userDetail struct
Err := db.Select(&user)
if Err != nil {
log.Printf("Error finding the user. Error: %v", Err)
return false
}
//verify the entered password and the password stored in db
if user.Password != p {
log.Printf("Wrong password.")
return false
}
log.Printf("Found the user")
return true
}
/*
getAllUser()
return all users in the database but only their email,first name and last name
*/
func getAllUser(db *pg.DB) ([]userDetailNoPassword, error) {
var users []userDetailNoPassword
//returns all rows with only email, firstName and lastName
_, err := db.Query(&users, `SELECT email,"firstName","lastName" FROM user_details`)
if err != nil {
log.Printf("Error returning all users. Error: %v", err)
return nil, err
}
return users, nil
}
/*
updateName()
given the primary key in this case the email address, we will:
1. retrive data
2. update data
3. update db
4. return the updated user struct
*/
func (n *name) updateName(pk string, db *pg.DB) *userDetail {
user := &userDetail{
Email: pk,
}
//select using the user's primary key while populating data into the
//userDetail struct
Err := db.Select(user)
if Err != nil {
log.Printf("Error finding the user. Error: %v", Err)
return nil
}
//altering the first and last name
user.FirstName = n.FirstName
user.LastName = n.LastName
log.Printf("name has been changed")
//updating the db
Err = db.Update(user)
if Err != nil {
log.Printf("Error updating the information. Error: %v", Err)
return nil
}
return user
}