#! /usr/bin/env python
__all__ = ['Author', 'Book', 'Extension', 'Genre', 'Language',
+ 'AuthorBook', 'BookGenre',
'init_db', 'insert_name', 'update_counters',
]
name = UnicodeCol(unique=True)
count = IntCol()
count_idx = DatabaseIndex('count')
- books = RelatedJoin('Book', otherColumn='book_id')
+ books = RelatedJoin('Book', otherColumn='book_id',
+ intermediateTable='author_book',
+ createRelatedTable=False)
+
+
+class AuthorBook(SQLObject):
+ class sqlmeta:
+ table = "author_book"
+ author = ForeignKey('Author', notNull=True, cascade=True)
+ book = ForeignKey('Book', notNull=True, cascade=True)
+ main_idx = DatabaseIndex(author, book, unique=True)
class Book(SQLObject):
- authors = RelatedJoin('Author')
- genres = RelatedJoin('Genre')
+ authors = RelatedJoin('Author',
+ intermediateTable='author_book',
+ createRelatedTable=False)
+ genres = RelatedJoin('Genre',
+ intermediateTable='book_genre',
+ createRelatedTable=False)
title = UnicodeCol()
series = UnicodeCol()
ser_no = IntCol()
archive_file_idx = DatabaseIndex('archive', 'file', unique=True)
+class BookGenre(SQLObject):
+ class sqlmeta:
+ table = "book_genre"
+ book = ForeignKey('Book', notNull=True, cascade=True)
+ genre = ForeignKey('Genre', notNull=True, cascade=True)
+ main_idx = DatabaseIndex(book, genre, unique=True)
+
+
class Extension(SQLObject):
name = StringCol(unique=True)
count = IntCol()
title = UnicodeCol()
count = IntCol()
count_idx = DatabaseIndex('count')
- books = RelatedJoin('Book', otherColumn='book_id')
+ books = RelatedJoin('Book', otherColumn='book_id',
+ intermediateTable='book_genre',
+ createRelatedTable=False)
class Language(SQLObject):
except IndexError: # Table exists but is empty
return
except dberrors.Error:
- for table in Author, Extension, Genre, Language, Book:
+ for table in Author, Extension, Genre, Language, Book, \
+ AuthorBook, BookGenre:
table.createTable()
else:
return
return table(name=name, count=0, **kw)
+def update_counters():
+ for author in Author.select():
+ author.count = len(author.books)
+
+ for ext in Extension.select():
+ ext.count = Book.select(Book.q.extension == ext.name).count()
+
+ for genre in Genre.select():
+ genre.count = len(genre.books)
+
+ for language in Language.select():
+ language.count = Book.select(Book.q.language == language.name).count()
+
+
def test():
print "DB dirs:", db_dirs
if db_uri: