go-bouquins/bouquins/db.go

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2017-07-30 18:14:20 +00:00
package bouquins
import (
"database/sql"
)
const (
STMT_PAGE = " LIMIT ? OFFSET ?"
STMT_BOOKS0 = `SELECT books.id AS id,title,series_index,name as series_name,series.id AS series_id
FROM books LEFT OUTER JOIN books_series_link ON books.id = books_series_link.book
LEFT OUTER JOIN series ON series.id = books_series_link.series `
STMT_BOOKS_TAGS0 = `SELECT name, books_tags_link.book as book FROM tags, books_tags_link
WHERE tags.id = books_tags_link.tag AND books_tags_link.book IN ( SELECT id FROM books `
STMT_BOOKS_AUTHORS0 = `SELECT authors.id, authors.name, books_authors_link.book as book
FROM authors, books_authors_link WHERE books_authors_link.author = authors.id
AND books_authors_link.book IN ( SELECT id FROM books `
STMT_WHERE = " WHERE "
STMT_SEARCH_TERM = " books.sort like ? "
STMT_BOOL_AND = " AND "
STMT_BOOL_OR = " OR "
STMT_SEARCH_ORDER = " ORDER BY books.sort"
STMT_BOOKS_COUNT = "SELECT count(id) FROM books"
STMT_BOOK = `SELECT books.id AS id,title, series_index, series.name AS series_name, series.id AS series_id,
strftime('%s', timestamp), strftime('%Y', pubdate), isbn,lccn,path,uuid,has_cover,
languages.lang_code, publishers.name AS pubname FROM books
LEFT OUTER JOIN books_languages_link ON books_languages_link.book = books.id
LEFT OUTER JOIN languages ON languages.id = books_languages_link.lang_code
LEFT OUTER JOIN data ON data.book = books.id
LEFT OUTER JOIN books_series_link ON books.id = books_series_link.book
LEFT OUTER JOIN series ON series.id = books_series_link.series
LEFT OUTER JOIN books_publishers_link ON books.id = books_publishers_link.book
LEFT OUTER JOIN publishers ON publishers.id = books_publishers_link.publisher
WHERE books.id = ?`
STMT_BOOK_TAGS = "SELECT name FROM tags, books_tags_link WHERE tags.id = books_tags_link.tag AND books_tags_link.book = ?"
STMT_BOOK_AUTHORS = `SELECT authors.id, authors.name, books_authors_link.book as book
FROM authors, books_authors_link WHERE books_authors_link.author = authors.id
AND books_authors_link.book = ?`
STMT_BOOK_DATA = "SELECT data.name, data.format, data.uncompressed_size FROM data WHERE data.book = ?"
STMT_BOOKS_ID_ASC = STMT_BOOKS0 + " ORDER BY id" + STMT_PAGE
STMT_BOOKS_ID_DESC = STMT_BOOKS0 + "ORDER BY id DESC" + STMT_PAGE
STMT_BOOKS_TITLE_ASC = STMT_BOOKS0 + "ORDER BY books.sort" + STMT_PAGE
STMT_BOOKS_TITLE_DESC = STMT_BOOKS0 + "ORDER BY books.sort DESC" + STMT_PAGE
STMT_BOOKS_TAGS_ID_ASC = STMT_BOOKS_TAGS0 + "ORDER BY id" + STMT_PAGE + ")"
STMT_BOOKS_TAGS_ID_DESC = STMT_BOOKS_TAGS0 + "ORDER BY id DESC" + STMT_PAGE + ")"
STMT_BOOKS_TAGS_TITLE_ASC = STMT_BOOKS_TAGS0 + "ORDER BY books.sort" + STMT_PAGE + ")"
STMT_BOOKS_TAGS_TITLE_DESC = STMT_BOOKS_TAGS0 + "ORDER BY books.sort DESC" + STMT_PAGE + ")"
STMT_BOOKS_AUTHORS_ID_ASC = STMT_BOOKS_AUTHORS0 + "ORDER BY id" + STMT_PAGE + ")"
STMT_BOOKS_AUTHORS_ID_DESC = STMT_BOOKS_AUTHORS0 + "ORDER BY id DESC" + STMT_PAGE + ")"
STMT_BOOKS_AUTHORS_TITLE_ASC = STMT_BOOKS_AUTHORS0 + "ORDER BY books.sort" + STMT_PAGE + ")"
STMT_BOOKS_AUTHORS_TITLE_DESC = STMT_BOOKS_AUTHORS0 + "ORDER BY books.sort DESC" + STMT_PAGE + ")"
DEF_LIM = 10
)
// MERGE SUB QUERIES //
func assignAuthorsTagsBooks(books []*BookAdv, authors map[int64][]*Author, tags map[int64][]string) {
for _, b := range books {
b.Authors = authors[b.Id]
b.Tags = tags[b.Id]
}
}
// SUB QUERIES //
func (app *Bouquins) queryBooks(limit, offset int) ([]*BookAdv, error) {
books := make([]*BookAdv, 0, limit)
stmt, err := app.DB.Prepare(STMT_BOOKS_ID_ASC)
if err != nil {
return nil, err
}
rows, err := stmt.Query(limit, offset)
if err != nil {
return nil, err
}
for rows.Next() {
book := new(BookAdv)
var series_name sql.NullString
var series_id sql.NullInt64
if err := rows.Scan(&book.Id, &book.Title, &book.SeriesIndex, &series_name, &series_id); err != nil {
return nil, err
}
if series_name.Valid && series_id.Valid {
book.Series = &Series{
series_id.Int64,
series_name.String,
}
}
books = append(books, book)
}
if err := rows.Err(); err != nil {
return nil, err
}
return books, nil
}
func (app *Bouquins) queryBooksAuthors(limit, offset int) (map[int64][]*Author, error) {
authors := make(map[int64][]*Author)
stmt, err := app.DB.Prepare(STMT_BOOKS_AUTHORS_ID_ASC)
if err != nil {
return nil, err
}
rows, err := stmt.Query(limit, offset)
if err != nil {
return nil, err
}
for rows.Next() {
author := new(Author)
var book int64
if err := rows.Scan(&author.Id, &author.Name, &book); err != nil {
return nil, err
}
if authors[book] == nil {
authors[book] = append(make([]*Author, 0), author)
} else {
authors[book] = append(authors[book], author)
}
}
if err := rows.Err(); err != nil {
return nil, err
}
return authors, nil
}
func (app *Bouquins) queryBooksTags(limit, offset int) (map[int64][]string, error) {
tags := make(map[int64][]string)
stmt, err := app.DB.Prepare(STMT_BOOKS_TAGS_ID_ASC)
if err != nil {
return nil, err
}
rows, err := stmt.Query(limit, offset)
if err != nil {
return nil, err
}
for rows.Next() {
var tag string
var book int64
if err := rows.Scan(&tag, &book); err != nil {
return nil, err
}
bookTags := tags[book]
if bookTags == nil {
bookTags = make([]string, 1)
tags[book] = bookTags
}
tags[book] = append(bookTags, tag)
}
if err := rows.Err(); err != nil {
return nil, err
}
return tags, nil
}
// DB LOADS //
func (app *Bouquins) BookCount() (int64, error) {
var count int64
row := app.DB.QueryRow(STMT_BOOKS_COUNT)
err := row.Scan(&count)
return count, err
}
func (app *Bouquins) BooksAdv(limit int, offset int) ([]*BookAdv, error) {
if limit == 0 {
limit = DEF_LIM
}
books, err := app.queryBooks(limit, offset)
if err != nil {
return nil, err
}
authors, err := app.queryBooksAuthors(limit, offset)
if err != nil {
return nil, err
}
tags, err := app.queryBooksTags(limit, offset)
if err != nil {
return nil, err
}
assignAuthorsTagsBooks(books, authors, tags)
return books, nil
}