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todo_app.go
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/
todo_app.go
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package main
import (
"database/sql"
_ "github.com/mattn/go-sqlite3"
"html/template"
"log"
"net/http"
"strconv"
"strings"
)
type Todo struct {
Id int
Name string
}
var Db *sql.DB
func init() {
var err error
Db, err = sql.Open("sqlite3", "db.sqlite")
if err != nil {
log.Fatal(err)
}
}
func getTodos(limit int) (todos []Todo, err error) {
rows, err := Db.Query("select id, name from todos limit $1", limit)
if err != nil {
return
}
for rows.Next() {
todo := Todo{}
err = rows.Scan(&todo.Id, &todo.Name)
if err != nil {
return
}
todos = append(todos, todo)
}
rows.Close()
return
}
func (todo *Todo) addTodo() (err error) {
stm := "insert into todos (name) values ($1) returning id"
s, err := Db.Prepare(stm)
if err != nil {
return
}
defer s.Close()
err = s.QueryRow(todo.Name).Scan(&todo.Id)
return
}
func (todo *Todo) Delete() (err error) {
_, err = Db.Exec("delete from todos where id = $1", todo.Id)
return
}
func fetchTodos(writer http.ResponseWriter, request *http.Request) {
todos := make(map[int]string)
results, err := getTodos(10)
for _, t := range results {
todos[t.Id] = t.Name
}
if err != nil {
log.Fatal(err)
}
t, _ := template.ParseFiles("templates/todo_template.html")
t.Execute(writer, todos)
}
func addTodo(writer http.ResponseWriter, request *http.Request) {
// request.ParseForm()
newItem := request.FormValue("item")
newTodo := Todo{
Name: newItem,
}
err := newTodo.addTodo()
if err != nil {
log.Fatal(err)
}
http.Redirect(writer, request, "/", http.StatusFound)
}
func deleteTodo(writer http.ResponseWriter, request *http.Request) {
requestURL := request.URL.Path
urlSplit := strings.Split(requestURL, "/")
// indToDelete := urlSplit[len(urlSplit)-1]
indToDelete, err := strconv.Atoi(urlSplit[len(urlSplit)-1])
if err != nil {
log.Fatal(err)
}
newTodo := Todo{
Id: indToDelete,
}
_ = newTodo.Delete()
http.Redirect(writer, request, "/", http.StatusFound)
}
func main() {
server := http.Server{
Addr: "127.0.0.1:8081",
}
http.HandleFunc("/", fetchTodos)
http.HandleFunc("/add/", addTodo)
http.HandleFunc("/delete/", deleteTodo)
server.ListenAndServe()
}