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sqlite.go
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sqlite.go
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package sqlite
import (
"database/sql"
"errors"
_ "github.com/mattn/go-sqlite3"
"github.com/victorfernandesraton/bushido/bushido"
)
func New() (bushido.LocalStorage, error) {
db, err := sql.Open("sqlite3", "sqlite-bushido.db")
if err != nil {
return nil, err
}
st := &StorageSqlite{db: db}
if err := st.CreateTables(); err != nil {
return nil, err
}
return st, nil
}
type StorageSqlite struct {
db *sql.DB
}
func (s *StorageSqlite) CreateTables() error {
err := s.createTableContent()
if err != nil {
return err
}
err = s.createTableChapters()
if err != nil {
return err
}
err = s.createTablePages()
if err != nil {
return err
}
return nil
}
func (s *StorageSqlite) createTableContent() error {
query := `
CREATE TABLE IF NOT EXISTS content(
id INTEGER PRIMARY KEY AUTOINCREMENT,
external_id INTEGER NOT NULL,
title TEXT NOT NULL,
link TEXT NOT NULL,
source TEXT,
description TEXT,
author TEXT
);`
_, err := s.db.Exec(query)
return err
}
func (s *StorageSqlite) createTableChapters() error {
query := `
CREATE TABLE IF NOT EXISTS chapter (
id INTEGER PRIMARY KEY AUTOINCREMENT,
external_id INTEGER NOT NULL,
title TEXT NOT NULL,
link TEXT NOT NULL,
source TEXT NOT NULL,
content_id INTEGER NOT NULL,
FOREIGN KEY (content_id) REFERENCES content(id),
UNIQUE(external_id, content_id)
);`
_, err := s.db.Exec(query)
return err
}
func (s *StorageSqlite) createTablePages() error {
query := `CREATE TABLE IF NOT EXISTS page (
id INTEGER PRIMARY KEY AUTOINCREMENT,
chapter_id INTEGER NOT NULL,
content_id INTEGER NOT NULL,
source TEXT NOT NULL,
page_index INTEGER NOT NULL,
link TEXT NOT NULL,
FOREIGN KEY (content_id) REFERENCES content(id),
FOREIGN KEY (chapter_id) REFERENCES chapter(id),
UNIQUE( content_id, chapter_id, page_index, source)
);`
_, err := s.db.Exec(query)
return err
}
func (s *StorageSqlite) Add(content bushido.Content) error {
query := `INSERT INTO content (external_id, title, link, source, description, author) values (?, ? , ? , ?, ? , ?)`
_, err := s.db.Exec(query, content.ExternalId, content.Title, content.Link, content.Source.ID, content.Description, content.Author)
if err != nil {
return err
}
return nil
}
func (s *StorageSqlite) FindById(id int) (*bushido.Content, error) {
query := `select id, external_id, title, link, source, description, author from content where id = ?`
rows, err := s.db.Query(query, id)
if err != nil {
return nil, err
}
defer rows.Close()
var contents []bushido.Content
for rows.Next() {
var content bushido.Content
if err := rows.Scan(&content.ID, &content.ExternalId, &content.Title, &content.Link, &content.Source.ID, &content.Description, &content.Author); err != nil {
return nil, err
}
contents = append(contents, content)
}
if len(contents) != 1 {
return nil, errors.New("content not found")
}
return &contents[0], nil
}
func (s *StorageSqlite) FindByLink(link string) (*bushido.Content, error) {
query := `select id, external_id, title, link, source, description, author from content where link = ?`
rows, err := s.db.Query(query, link)
if err != nil {
return nil, err
}
defer rows.Close()
var contents []bushido.Content
for rows.Next() {
var content bushido.Content
if err := rows.Scan(&content.ID, &content.ExternalId, &content.Title, &content.Link, &content.Source.ID, &content.Description, &content.Author); err != nil {
return nil, err
}
contents = append(contents, content)
}
if len(contents) != 1 {
return nil, errors.New("content not found")
}
return &contents[0], nil
}
func (s *StorageSqlite) ListByName(name string) ([]bushido.Content, error) {
query := `select id, external_id, title, link, source, description, author from content where LOWER(title) LIKE '%' || LOWER(?) || '%'`
rows, err := s.db.Query(query, name)
if err != nil {
return nil, err
}
defer rows.Close()
var contents []bushido.Content
for rows.Next() {
var content bushido.Content
if err := rows.Scan(&content.ID, &content.ExternalId, &content.Title, &content.Link, &content.Source.ID, &content.Description, &content.Author); err != nil {
return nil, err
}
contents = append(contents, content)
}
return contents, nil
}
func (s *StorageSqlite) AppendChapter(content bushido.Content, chapters []bushido.Chapter) error {
query := `INSERT INTO chapter (external_id, title, link, source, content_id)
VALUES (?, ?, ?, ?, ?)
ON CONFLICT(external_id, content_id) DO UPDATE SET
title = excluded.title,
link = excluded.link,
source = excluded.source,
content_id = excluded.content_id`
tx, err := s.db.Begin()
if err != nil {
return err
}
stmt, err := tx.Prepare(query)
if err != nil {
return err
}
for _, c := range chapters {
_, err := stmt.Exec(c.ExternalId, c.Title, c.Link, c.Content.Source, content.ID)
if err != nil {
return err
}
}
err = tx.Commit()
if err != nil {
return err
}
return nil
}
func (s *StorageSqlite) ListChaptersByContentId(contentId int) ([]bushido.Chapter, error) {
var result []bushido.Chapter
query := `SELECT
id,
external_id,
title,
link,
source,
content_id
FROM chapter WHERE content_id = ?`
rows, err := s.db.Query(query, contentId)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
var chapter bushido.Chapter
var content bushido.Content
if err := rows.Scan(&chapter.ID, &chapter.ExternalId, &chapter.Title, &chapter.Link, &content.Source.ID, &content.ExternalId); err != nil {
return nil, err
}
chapter.Content = &content
result = append(result, chapter)
}
return result, nil
}
func (s *StorageSqlite) AppendPages(chapter bushido.Chapter, pages []bushido.Page) error {
query := `INSERT INTO page (
content_id,
chapter_id,
source,
page_index,
link
)
VALUES (?, ?, ?, ?, ?)
ON CONFLICT(content_id, chapter_id, page_index, source) DO UPDATE SET
link = excluded.link`
tx, err := s.db.Begin()
if err != nil {
return err
}
stmt, err := tx.Prepare(query)
if err != nil {
return err
}
for idx, p := range pages {
_, err := stmt.Exec(chapter.Content.ID, chapter.ID, chapter.Content.Source, idx, p)
if err != nil {
return err
}
}
err = tx.Commit()
if err != nil {
return err
}
return nil
}
func (s *StorageSqlite) FindChapterById(id int) (*bushido.Chapter, error) {
query := `SELECT
id,
external_id,
title,
link,
source,
content_id
FROM chapter WHERE id = ?`
rows, err := s.db.Query(query, id)
if err != nil {
return nil, err
}
defer rows.Close()
var chapters []bushido.Chapter
for rows.Next() {
var content bushido.Content
var chapter bushido.Chapter
if err := rows.Scan(&chapter.ID, &chapter.ExternalId, &chapter.Title, &chapter.Link, &content.Source.ID, &content.ID); err != nil {
return nil, err
}
chapter.Content = &content
chapters = append(chapters, chapter)
}
if len(chapters) != 1 {
return nil, errors.New("chapter not found")
}
return &chapters[0], nil
}