udemy-go-web-2/internal/models/models.go

221 lines
5.6 KiB
Go

package models
import (
"context"
"database/sql"
"time"
)
// DBModel is the type for database connection values
type DBModel struct {
DB *sql.DB
}
// Models is the wrapper for all models
type Models struct {
DB DBModel
}
// NewModels returns a model type with database connection pool
func NewModels(db *sql.DB) Models {
return Models{
DB: DBModel{DB: db},
}
}
// Widget is the type for all widgets
type Widget struct {
ID int `json:"id"`
Name string `json:"name"`
Description string `json:"description"`
InventoryLevel int `json:"inventory_level"`
Price int `json:"price"`
CreatedAt time.Time `json:"-"`
UpdatedAt time.Time `json:"-"`
Image string `json:"image"`
}
// Order is the type for all orders
type Order struct {
ID int `json:"id"`
WidgetID int `json:"widget_id"`
TransactionID int `json:"transaction_id"`
CustomerID int `json:"customer_id"`
StatusID int `json:"status_id"`
Quantity int `json:"quantity"`
Amount int `json:"amount"`
CreatedAt time.Time `json:"-"`
UpdatedAt time.Time `json:"-"`
}
// Status is the type for orders statuses
type Status struct {
ID int `json:"id"`
Name string `json:"name"`
CreatedAt time.Time `json:"-"`
UpdatedAt time.Time `json:"-"`
}
// TransactionStatus is the type for transaction statuses
type TransactionStatus struct {
ID int `json:"id"`
Name string `json:"name"`
CreatedAt time.Time `json:"-"`
UpdatedAt time.Time `json:"-"`
}
// Transaction is the type for transactions
type Transaction struct {
ID int `json:"id"`
Amount int `json:"amount"`
Currency string `json:"currency"`
LastFour string `json:"last_four"`
ExpiryMonth int `json:"expiry_month"`
ExpiryYear int `json:"expiry_year"`
PaymentIntent string `json:"payment_intent"`
PaymentMethod string `json:"payment_method"`
BankReturnCode string `json:"bank_return_code"`
TransactionStatusID int `json:"transaction_status_id"`
CreatedAt time.Time `json:"-"`
UpdatedAt time.Time `json:"-"`
}
// User is the type for users
type User struct {
ID int `json:"id"`
FirstName string `json:"first_name"`
LastName string `json:"last_name"`
Email string `json:"email"`
Password string `json:"password"`
CreatedAt time.Time `json:"-"`
UpdatedAt time.Time `json:"-"`
}
// Customer is the type for customers
type Customer struct {
ID int `json:"id"`
FirstName string `json:"first_name"`
LastName string `json:"last_name"`
Email string `json:"email"`
CreatedAt time.Time `json:"-"`
UpdatedAt time.Time `json:"-"`
}
func (m *DBModel) GetWidget(id int) (Widget, error) {
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
var widget Widget
query := `SELECT id, name, description, inventory_level, price,
coalesce(image, ''),
created_at, updated_at
FROM widgets WHERE id = ?;`
row := m.DB.QueryRowContext(ctx, query, id)
err := row.Scan(
&widget.ID,
&widget.Name,
&widget.Description,
&widget.InventoryLevel,
&widget.Price,
&widget.Image,
&widget.CreatedAt,
&widget.UpdatedAt,
)
if err != nil {
return widget, err
}
return widget, nil
}
// InsertTransaction inserts a new txn, and returns its id
func (m *DBModel) InsertTransaction(txn Transaction) (int, error) {
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
stmt := `INSERT INTO transactions
(amount, currency, last_four, expiry_month, expiry_year,
payment_intent, payment_method, bank_return_code,
transaction_status_id, created_at, updated_at)
VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`
result, err := m.DB.ExecContext(ctx, stmt,
txn.Amount,
txn.Currency,
txn.LastFour,
txn.ExpiryMonth,
txn.ExpiryYear,
txn.PaymentIntent,
txn.PaymentMethod,
txn.BankReturnCode,
txn.TransactionStatusID,
time.Now(),
time.Now(),
)
if err != nil {
return 0, err
}
id, err := result.LastInsertId()
if err != nil {
return 0, err
}
return int(id), nil
}
// InsertOrder inserts a new order, and returns its id
func (m *DBModel) InsertOrder(order Order) (int, error) {
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
stmt := `INSERT INTO orders
(widget_id, transaction_id, customer_id, status_id, quantity,
amount, created_at, updated_at)
VALUES (?, ?, ?, ?, ?, ?, ?, ?)`
result, err := m.DB.ExecContext(ctx, stmt,
order.WidgetID,
order.TransactionID,
order.CustomerID,
order.StatusID,
order.Quantity,
order.Amount,
time.Now(),
time.Now(),
)
if err != nil {
return 0, err
}
id, err := result.LastInsertId()
if err != nil {
return 0, err
}
return int(id), nil
}
// InsertCustomer inserts a new customer, and returns its id
func (m *DBModel) InsertCustomer(customer Customer) (int, error) {
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
stmt := `INSERT INTO customers
(first_name, last_name, email, created_at, updated_at)
VALUES (?, ?, ?, ?, ?)`
result, err := m.DB.ExecContext(ctx, stmt,
customer.FirstName,
customer.LastName,
customer.Email,
time.Now(),
time.Now(),
)
if err != nil {
return 0, err
}
id, err := result.LastInsertId()
if err != nil {
return 0, err
}
return int(id), nil
}