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todo.go
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todo.go
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package main
import (
"fmt"
"flag"
"database/sql"
_ "github.com/mattn/go-sqlite3"
)
func main(){
list := flag.Bool("list",false,"List tasks")
newTask := flag.String("new","","New Task")
deleteTask := flag.Int("delete",0,"Delete Task")
flag.Parse()
db, err := sql.Open("sqlite3","todo.db")
if err!=nil {
panic(err)
}
defer db.Close()
table(db)
switch{
case *list:
listAll(db)
case *newTask!="":
createTask(newTask, db)
case *deleteTask!=0:
removeTask(deleteTask, db)
default:
help()
}
}
func removeTask(id *int, db *sql.DB){
tx, err:=db.Begin()
if err!=nil {
panic(err)
}
stmt, err := tx.Prepare("DELETE FROM todogo WHERE id=?")
defer stmt.Close()
if err!=nil{
panic(err)
}
stmt.Exec(id)
tx.Commit()
fmt.Printf("Deleted #%d",*id)
}
func listAll(db *sql.DB){
rows, err := db.Query("select id,title from todogo")
if err!=nil {
panic(err)
}
defer rows.Close()
for rows.Next() {
var id int
var title string
rows.Scan(&id,&title)
fmt.Printf("#%d %s \n",id,title)
}
}
func createTask(newTask *string, db *sql.DB){
tx, err := db.Begin()
if err!=nil {
panic(err)
}
stmt, err := tx.Prepare("Insert Into todogo(id,title) values(?,?)")
defer stmt.Close()
if err!=nil {
panic(err)
}
res, err := stmt.Exec(nil, *newTask)
tx.Commit()
if err!=nil {
panic(err)
}
id,err:=res.LastInsertId();
if err!=nil{
panic(err)
}
fmt.Println("Task created. ",id)
}
func help(){
fmt.Println(`
### TODO.go
--help Help screen
--new=[task] Create new task
--list List all tasks
--delete=[id] Delete task
`)
}
func table(db *sql.DB) {
var query string;
query =`
CREATE TABLE IF NOT EXISTS todogo
(id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
title TEXT NOT NULL);`
_,err := db.Exec(query)
if err!=nil {
panic(err)
}
}