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// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package storage // import "miniflux.app/storage"
import (
"database/sql"
"errors"
"fmt"
"miniflux.app/model"
)
// AnotherCategoryExists checks if another category exists with the same title.
func (s *Storage) AnotherCategoryExists(userID, categoryID int64, title string) bool {
var result bool
query := `SELECT true FROM categories WHERE user_id=$1 AND id != $2 AND title=$3`
s.db.QueryRow(query, userID, categoryID, title).Scan(&result)
return result
}
// CategoryExists checks if the given category exists into the database.
func (s *Storage) CategoryExists(userID, categoryID int64) bool {
var result bool
query := `SELECT true FROM categories WHERE user_id=$1 AND id=$2`
s.db.QueryRow(query, userID, categoryID).Scan(&result)
return result
}
// Category returns a category from the database.
func (s *Storage) Category(userID, categoryID int64) (*model.Category, error) {
var category model.Category
query := `SELECT id, user_id, title FROM categories WHERE user_id=$1 AND id=$2`
err := s.db.QueryRow(query, userID, categoryID).Scan(&category.ID, &category.UserID, &category.Title)
switch {
case err == sql.ErrNoRows:
return nil, nil
case err != nil:
return nil, fmt.Errorf(`store: unable to fetch category: %v`, err)
default:
return &category, nil
}
}
// FirstCategory returns the first category for the given user.
func (s *Storage) FirstCategory(userID int64) (*model.Category, error) {
query := `SELECT id, user_id, title FROM categories WHERE user_id=$1 ORDER BY title ASC LIMIT 1`
var category model.Category
err := s.db.QueryRow(query, userID).Scan(&category.ID, &category.UserID, &category.Title)
switch {
case err == sql.ErrNoRows:
return nil, nil
case err != nil:
return nil, fmt.Errorf(`store: unable to fetch category: %v`, err)
default:
return &category, nil
}
}
// CategoryByTitle finds a category by the title.
func (s *Storage) CategoryByTitle(userID int64, title string) (*model.Category, error) {
var category model.Category
query := `SELECT id, user_id, title FROM categories WHERE user_id=$1 AND title=$2`
err := s.db.QueryRow(query, userID, title).Scan(&category.ID, &category.UserID, &category.Title)
switch {
case err == sql.ErrNoRows:
return nil, nil
case err != nil:
return nil, fmt.Errorf(`store: unable to fetch category: %v`, err)
default:
return &category, nil
}
}
// Categories returns all categories that belongs to the given user.
func (s *Storage) Categories(userID int64) (model.Categories, error) {
query := `SELECT id, user_id, title FROM categories WHERE user_id=$1 ORDER BY title ASC`
rows, err := s.db.Query(query, userID)
if err != nil {
return nil, fmt.Errorf(`store: unable to fetch categories: %v`, err)
}
defer rows.Close()
categories := make(model.Categories, 0)
for rows.Next() {
var category model.Category
if err := rows.Scan(&category.ID, &category.UserID, &category.Title); err != nil {
return nil, fmt.Errorf(`store: unable to fetch category row: %v`, err)
}
categories = append(categories, &category)
}
return categories, nil
}
// CategoriesWithFeedCount returns all categories with the number of feeds.
func (s *Storage) CategoriesWithFeedCount(userID int64) (model.Categories, error) {
query := `
SELECT
c.id,
c.user_id,
c.title,
(SELECT count(*) FROM feeds WHERE feeds.category_id=c.id) AS count
FROM categories c
WHERE
user_id=$1
ORDER BY c.title ASC
`
rows, err := s.db.Query(query, userID)
if err != nil {
return nil, fmt.Errorf(`store: unable to fetch categories: %v`, err)
}
defer rows.Close()
categories := make(model.Categories, 0)
for rows.Next() {
var category model.Category
if err := rows.Scan(&category.ID, &category.UserID, &category.Title, &category.FeedCount); err != nil {
return nil, fmt.Errorf(`store: unable to fetch category row: %v`, err)
}
categories = append(categories, &category)
}
return categories, nil
}
// CreateCategory creates a new category.
func (s *Storage) CreateCategory(category *model.Category) error {
query := `
INSERT INTO categories
(user_id, title)
VALUES
($1, $2)
RETURNING
id
`
err := s.db.QueryRow(
query,
category.UserID,
category.Title,
).Scan(&category.ID)
if err != nil {
return fmt.Errorf(`store: unable to create category: %v`, err)
}
return nil
}
// UpdateCategory updates an existing category.
func (s *Storage) UpdateCategory(category *model.Category) error {
query := `UPDATE categories SET title=$1 WHERE id=$2 AND user_id=$3`
_, err := s.db.Exec(
query,
category.Title,
category.ID,
category.UserID,
)
if err != nil {
return fmt.Errorf(`store: unable to update category: %v`, err)
}
return nil
}
// RemoveCategory deletes a category.
func (s *Storage) RemoveCategory(userID, categoryID int64) error {
query := `DELETE FROM categories WHERE id = $1 AND user_id = $2`
result, err := s.db.Exec(query, categoryID, userID)
if err != nil {
return fmt.Errorf(`store: unable to remove this category: %v`, err)
}
count, err := result.RowsAffected()
if err != nil {
return fmt.Errorf(`store: unable to remove this category: %v`, err)
}
if count == 0 {
return errors.New(`store: no category has been removed`)
}
return nil
}
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