diff --git a/main.go b/main.go
index f8a6891..f283bc7 100644
--- a/main.go
+++ b/main.go
@@ -1,7 +1,9 @@
 package main
 
 import (
+	"database/sql"
 	"encoding/json"
+	"fmt"
 	"os"
 	"sort"
 	"time"
@@ -30,6 +32,14 @@ func start(path *string) func(*cli.Cmd) {
 				NPomodoros: *pomodoros,
 				Duration:   parsed,
 			}
+			maybe(db.With(func(tx *sql.Tx) error {
+				id, err := db.CreateTask(tx, *task)
+				if err != nil {
+					return err
+				}
+				task.ID = id
+				return nil
+			}))
 			runner, err := NewTaskRunner(task, db, NewXnotifier(*path+"/icon.png"))
 			maybe(err)
 			server, err := NewServer(*path+"/pomo.sock", runner)
@@ -63,39 +73,51 @@ func create(path *string) func(*cli.Cmd) {
 				NPomodoros: *pomodoros,
 				Duration:   parsed,
 			}
-			taskID, err := db.CreateTask(*task)
-			maybe(err)
+			maybe(db.With(func(tx *sql.Tx) error {
+				taskId, err := db.CreateTask(tx, *task)
+				if err != nil {
+					return err
+				}
+				fmt.Println(taskId)
+				return nil
+			}))
 		}
 	}
 }
 
 func begin(path *string) func(*cli.Cmd) {
 	return func(cmd *cli.Cmd) {
-		cmd.Spec = "ID"
-		var jobId = cmd.IntArg("ID", -1, "ID of Pomodoro to begin")
+		cmd.Spec = "[OPTIONS] TASK_ID"
+		var (
+			taskId = cmd.IntArg("TASK_ID", -1, "ID of Pomodoro to begin")
+		)
 
 		cmd.Action = func() {
 			db, err := NewStore(*path)
 			maybe(err)
 			defer db.Close()
-			tasks, err := db.ReadTasks()
-			maybe(err)
-			task := &Task{}
-			for _, task = range tasks {
-				if task.ID == *jobId {
-					break
+			var task *Task
+			maybe(db.With(func(tx *sql.Tx) error {
+				read, err := db.ReadTask(tx, *taskId)
+				if err != nil {
+					return err
 				}
-			}
-			if task.ID == *jobId {
-				runner, err := NewTaskRunner(task, db, NewXnotifier(*path+"/icon.png"))
-				maybe(err)
-				server, err := NewServer(*path+"/pomo.sock", runner)
-				maybe(err)
-				server.Start()
-				defer server.Stop()
-				runner.Start()
-				startUI(runner)
-			}
+				task = read
+				err = db.DeletePomodoros(tx, *taskId)
+				if err != nil {
+					return err
+				}
+				task.Pomodoros = []*Pomodoro{}
+				return nil
+			}))
+			runner, err := NewTaskRunner(task, db, NewXnotifier(*path+"/icon.png"))
+			maybe(err)
+			server, err := NewServer(*path+"/pomo.sock", runner)
+			maybe(err)
+			server.Start()
+			defer server.Stop()
+			runner.Start()
+			startUI(runner)
 		}
 	}
 }
@@ -128,24 +150,27 @@ func list(path *string) func(*cli.Cmd) {
 			db, err := NewStore(*path)
 			maybe(err)
 			defer db.Close()
-			tasks, err := db.ReadTasks()
-			maybe(err)
-			if *assend {
-				sort.Sort(sort.Reverse(ByID(tasks)))
-			}
-			if !*all {
-				tasks = After(time.Now().Add(-duration), tasks)
-			}
-			if *limit > 0 && (len(tasks) > *limit) {
-				tasks = tasks[0:*limit]
-			}
-			if *asJSON {
-				maybe(json.NewEncoder(os.Stdout).Encode(tasks))
-				return
-			}
-			config, err := NewConfig(*path + "/config.json")
-			maybe(err)
-			summerizeTasks(config, tasks)
+			maybe(db.With(func(tx *sql.Tx) error {
+				tasks, err := db.ReadTasks(tx)
+				maybe(err)
+				if *assend {
+					sort.Sort(sort.Reverse(ByID(tasks)))
+				}
+				if !*all {
+					tasks = After(time.Now().Add(-duration), tasks)
+				}
+				if *limit > 0 && (len(tasks) > *limit) {
+					tasks = tasks[0:*limit]
+				}
+				if *asJSON {
+					maybe(json.NewEncoder(os.Stdout).Encode(tasks))
+					return nil
+				}
+				config, err := NewConfig(*path + "/config.json")
+				maybe(err)
+				summerizeTasks(config, tasks)
+				return nil
+			}))
 		}
 	}
 }
@@ -158,7 +183,9 @@ func _delete(path *string) func(*cli.Cmd) {
 			db, err := NewStore(*path)
 			maybe(err)
 			defer db.Close()
-			maybe(db.DeleteTask(*taskID))
+			maybe(db.With(func(tx *sql.Tx) error {
+				return db.DeleteTask(tx, *taskID)
+			}))
 		}
 	}
 }
diff --git a/runner.go b/runner.go
index 9823484..97869d6 100644
--- a/runner.go
+++ b/runner.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"database/sql"
 	"time"
 )
 
@@ -20,12 +21,8 @@ type TaskRunner struct {
 }
 
 func NewTaskRunner(task *Task, store *Store, notifier Notifier) (*TaskRunner, error) {
-	taskID, err := store.CreateTask(*task)
-	if err != nil {
-		return nil, err
-	}
 	tr := &TaskRunner{
-		taskID:       taskID,
+		taskID:       task.ID,
 		taskMessage:  task.Message,
 		nPomodoros:   task.NPomodoros,
 		origDuration: task.Duration,
@@ -89,7 +86,9 @@ func (t *TaskRunner) run() error {
 			goto loop
 		}
 		pomodoro.End = time.Now()
-		err := t.store.CreatePomodoro(t.taskID, *pomodoro)
+		err := t.store.With(func(tx *sql.Tx) error {
+			return t.store.CreatePomodoro(tx, t.taskID, *pomodoro)
+		})
 		if err != nil {
 			return err
 		}
diff --git a/store.go b/store.go
index a56ed75..0152fbe 100644
--- a/store.go
+++ b/store.go
@@ -12,6 +12,8 @@ import (
 // 2018-01-16 19:05:21.752851759+08:00
 const datetimeFmt = "2006-01-02 15:04:05.999999999-07:00"
 
+type StoreFunc func(tx *sql.Tx) error
+
 type Store struct {
 	db *sql.DB
 }
@@ -25,39 +27,45 @@ func NewStore(path string) (*Store, error) {
 	return &Store{db: db}, nil
 }
 
-func (s Store) CreateTask(task Task) (int, error) {
-	var taskID int
+// With applies all of the given functions with
+// a single transaction, rolling back on failure
+// and commiting on success.
+func (s Store) With(fns ...func(tx *sql.Tx) error) error {
 	tx, err := s.db.Begin()
 	if err != nil {
-		return -1, err
+		return err
 	}
-	_, err = tx.Exec(
+	for _, fn := range fns {
+		err = fn(tx)
+		if err != nil {
+			tx.Rollback()
+			return err
+		}
+	}
+	return tx.Commit()
+}
+
+func (s Store) CreateTask(tx *sql.Tx, task Task) (int, error) {
+	var taskID int
+	_, err := tx.Exec(
 		"INSERT INTO task (message,pomodoros,duration,tags) VALUES ($1,$2,$3,$4)",
 		task.Message, task.NPomodoros, task.Duration.String(), strings.Join(task.Tags, ","))
 	if err != nil {
-		tx.Rollback()
 		return -1, err
 	}
 	err = tx.QueryRow("SELECT last_insert_rowid() FROM task").Scan(&taskID)
 	if err != nil {
-		tx.Rollback()
 		return -1, err
 	}
-	return taskID, tx.Commit()
+	err = tx.QueryRow("SELECT last_insert_rowid() FROM task").Scan(&taskID)
+	if err != nil {
+		return -1, err
+	}
+	return taskID, nil
 }
 
-func (s Store) CreatePomodoro(taskID int, pomodoro Pomodoro) error {
-	_, err := s.db.Exec(
-		`INSERT INTO pomodoro (task_id, start, end) VALUES ($1, $2, $3)`,
-		taskID,
-		pomodoro.Start,
-		pomodoro.End,
-	)
-	return err
-}
-
-func (s Store) ReadTasks() ([]*Task, error) {
-	rows, err := s.db.Query(`SELECT rowid,message,pomodoros,duration,tags FROM task`)
+func (s Store) ReadTasks(tx *sql.Tx) ([]*Task, error) {
+	rows, err := tx.Query(`SELECT rowid,message,pomodoros,duration,tags FROM task`)
 	if err != nil {
 		return nil, err
 	}
@@ -77,7 +85,7 @@ func (s Store) ReadTasks() ([]*Task, error) {
 		if tags != "" {
 			task.Tags = strings.Split(tags, ",")
 		}
-		pomodoros, err := s.ReadPomodoros(task.ID)
+		pomodoros, err := s.ReadPomodoros(tx, task.ID)
 		if err != nil {
 			return nil, err
 		}
@@ -89,8 +97,49 @@ func (s Store) ReadTasks() ([]*Task, error) {
 	return tasks, nil
 }
 
-func (s Store) ReadPomodoros(taskID int) ([]*Pomodoro, error) {
-	rows, err := s.db.Query(`SELECT start,end FROM pomodoro WHERE task_id = $1`, &taskID)
+func (s Store) DeleteTask(tx *sql.Tx, taskID int) error {
+	_, err := tx.Exec("DELETE FROM task WHERE rowid = $1", &taskID)
+	if err != nil {
+		return err
+	}
+	_, err = tx.Exec("DELETE FROM pomodoro WHERE task_id = $1", &taskID)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (s Store) ReadTask(tx *sql.Tx, taskID int) (*Task, error) {
+	task := &Task{}
+	var (
+		tags        string
+		strDuration string
+	)
+	err := tx.QueryRow(`SELECT rowid,message,pomodoros,duration,tags FROM task WHERE rowid = $1`, &taskID).
+		Scan(&task.ID, &task.Message, &task.NPomodoros, &strDuration, &tags)
+	if err != nil {
+		return nil, err
+	}
+	duration, _ := time.ParseDuration(strDuration)
+	task.Duration = duration
+	if tags != "" {
+		task.Tags = strings.Split(tags, ",")
+	}
+	return task, nil
+}
+
+func (s Store) CreatePomodoro(tx *sql.Tx, taskID int, pomodoro Pomodoro) error {
+	_, err := tx.Exec(
+		`INSERT INTO pomodoro (task_id, start, end) VALUES ($1, $2, $3)`,
+		taskID,
+		pomodoro.Start,
+		pomodoro.End,
+	)
+	return err
+}
+
+func (s Store) ReadPomodoros(tx *sql.Tx, taskID int) ([]*Pomodoro, error) {
+	rows, err := tx.Query(`SELECT start,end FROM pomodoro WHERE task_id = $1`, &taskID)
 	if err != nil {
 		return nil, err
 	}
@@ -114,22 +163,9 @@ func (s Store) ReadPomodoros(taskID int) ([]*Pomodoro, error) {
 	return pomodoros, nil
 }
 
-func (s Store) DeleteTask(taskID int) error {
-	tx, err := s.db.Begin()
-	if err != nil {
-		return err
-	}
-	_, err = tx.Exec("DELETE FROM task WHERE rowid = $1", &taskID)
-	if err != nil {
-		tx.Rollback()
-		return err
-	}
-	_, err = tx.Exec("DELETE FROM pomodoro WHERE task_id = $1", &taskID)
-	if err != nil {
-		tx.Rollback()
-		return err
-	}
-	return tx.Commit()
+func (s Store) DeletePomodoros(tx *sql.Tx, taskID int) error {
+	_, err := tx.Exec("DELETE FROM pomodoro WHERE task_id = $1", &taskID)
+	return err
 }
 
 func (s Store) Close() error { return s.db.Close() }