Speedup SQLite connection

[m_librarian.git] / m_librarian / db.py

diff --git a/m_librarian/db.py b/m_librarian/db.py
index 225e2ec613a97bb0751442bf6501430a5e9f9909..9a5eb0af3e65dd95c5b0a2045e6b2c892ed51b2b 100755 (executable)
--- a/m_librarian/db.py
+++ b/m_librarian/db.py
@@ -1,8 +1,13 @@
 #! /usr/bin/env python
 
+__all__ = ['Author', 'Book', 'Extension', 'Genre', 'Language',
+           'init_db', 'insert_name',
+           ]
+
 import os
 from sqlobject import SQLObject, StringCol, UnicodeCol, IntCol, BoolCol, \
-    ForeignKey, DateCol, connectionForURI, sqlhub
+    ForeignKey, DateCol, RelatedJoin, \
+    connectionForURI, sqlhub, SQLObjectNotFound, dberrors
 from .config import ml_conf
 
 try:
@@ -32,48 +37,82 @@ if not db_uri:
         except OSError:  # Perhaps already exists
             pass
         db_file = os.path.join(db_dir, 'm_librarian.sqlite')
-        db_uri = 'sqlite://%s' % db_file.replace(os.sep, '/')
 
-sqlhub.processConnection = connectionForURI(db_uri)
+    db_uri = 'sqlite://%s' % db_file.replace(os.sep, '/')
 
 
-class Author(SQLObject):
-    name = UnicodeCol()
-    count = IntCol()
+sqlhub.processConnection = connection = connectionForURI(db_uri)
 
+if connection.dbName == 'sqlite':
+    # Speedup SQLite connection
+    connection.query("PRAGMA synchronous=OFF")
+    connection.query("PRAGMA count_changes=OFF")
+    connection.query("PRAGMA journal_mode=MEMORY")
+    connection.query("PRAGMA temp_store=MEMORY")
 
-class Genre(SQLObject):
-    name = StringCol()
-    title = UnicodeCol()
+
+class Author(SQLObject):
+    name = UnicodeCol(unique=True)
     count = IntCol()
+    books = RelatedJoin('Book', otherColumn='book_id')
 
 
 class Book(SQLObject):
-    author = ForeignKey('Author')
-    genre = ForeignKey('Genre')
+    authors = RelatedJoin('Author')
+    genres = RelatedJoin('Genre')
     title = UnicodeCol()
     series = UnicodeCol()
     ser_no = IntCol()
+    archive = StringCol()
     file = StringCol()
     size = IntCol()
     lib_id = StringCol()
     deleted = BoolCol()
-    ext = ForeignKey('Extension')
+    extension = ForeignKey('Extension')
     date = DateCol()
     language = ForeignKey('Language')
 
 
 class Extension(SQLObject):
-    name = StringCol()
+    name = StringCol(unique=True)
+    count = IntCol()
+
+
+class Genre(SQLObject):
+    name = StringCol(unique=True)
+    title = UnicodeCol()
     count = IntCol()
+    books = RelatedJoin('Book', otherColumn='book_id')
 
 
 class Language(SQLObject):
-    name = StringCol()
+    name = StringCol(unique=True)
     count = IntCol()
 
 
-if __name__ == '__main__':
+def init_db():
+    try:
+        Book.select()[0]
+    except IndexError:  # Table exists but is empty
+        return
+    except dberrors.Error:
+        for table in Author, Extension, Genre, Language, Book:
+            table.createTable()
+    else:
+        return
+
+
+def insert_name(table, name):
+    try:
+        return table.byName(name)
+    except SQLObjectNotFound:
+        return table(name=name, count=0)
+
+
+def test():
     print "DB dirs:", db_dirs
     if db_uri:
         print "DB URI:", db_uri
+
+if __name__ == '__main__':
+    test()