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Database.py
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Database.py
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import os
import sys
from sqlalchemy import Column, ForeignKey, Integer, String, Table
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship, sessionmaker
from sqlalchemy import create_engine
Base = declarative_base()
class Directory(Base):
__tablename__ = 'directory'
id = Column(Integer, primary_key=True)
path = Column(String(500), nullable=False)
parent_id = Column(Integer, ForeignKey('directory.id'))
parent = relationship('Directory', remote_side=[id], backref='children')
medias = relationship('Media', backref="directory")
def getFullPath(self):
path = self.path
parent = self.parent
while parent:
path = os.path.join(parent.path, path)
parent = parent.parent
return path
tag_association = Table('tag_association', Base.metadata,
Column('media_id', Integer, ForeignKey('media.id')),
Column('tag_id', Integer, ForeignKey('tag.id'))
)
class Media(Base):
__tablename__ = 'media'
id = Column(Integer, primary_key=True)
file_name = Column(String(200), nullable=False)
directory_id = Column(Integer, ForeignKey('directory.id'))
tags = relationship("Tag", secondary=tag_association, back_populates="medias")
def getFullPath(self):
return os.path.join(self.directory.getFullPath(), self.file_name)
class Tag(Base):
__tablename__ = 'tag'
id = Column(Integer, primary_key=True)
name = Column(String(100), nullable=False)
parent_id = Column(Integer, ForeignKey('tag.id'))
parent = relationship('Tag', remote_side=[id], backref='children')
medias = relationship("Media", secondary=tag_association, back_populates="tags")
### Querys
class Query(object):
def __init__(self, name=None):
if not name:
self.name = "new query"
else:
self.name = name
self.queries = []
self.medias = []
def execute(self):
pass
class DirQuery(Query):
def __init__(self, directory):
super().__init__(directory.path)
self.directory = directory
def execute(self):
children = self.directory.children
for child in children:
self.queries.append(DirQuery(child))
self.medias = self.directory.medias
class TagQuery(Query):
def __init__(self, tag):
super().__init__(tag.name)
self.tag = tag
def execute(self):
children = self.tag.children
for child in children:
self.queries.append(TagQuery(child))
self.medias = self.tag.medias
class MediaWithTagsQuery(Query):
def __init__(self, tags, db):
super().__init__("MediWithTagsQuery")
self.tags = tags
self.db = db
def execute(self):
print(self.tags)
media_query = self.db.session.query(Media).filter(Media.tags.contains(self.tags[0]))
for tag in self.tags[1:]:
media_query = media_query.filter(Media.tags.contains(tag))
self.medias = media_query.all()
class WholeTreeQuery(Query):
def __init__(self, db):
super().__init__("WholeTreeQuery")
self.roots = db.getRootDirs()
def execute(self):
for root in self.roots:
self.queries.append(DirQuery(root))
class AllMediaFlatQuery(Query):
def __init__(self, db):
super().__init__("AllMediaFlatQuery")
self.session = db.session
def execute(self):
self.medias = self.session.query(Media).all()
class TagTreeQuery(Query):
def __init__(self, db):
super().__init__("TagTreeQuery")
self.root_tags = db.session.query(Tag).filter(Tag.parent == None).all()
def execute(self):
for root in self.root_tags:
self.queries.append(TagQuery(root))
class PhotagDB():
def __init__(self):
self.engine = create_engine("sqlite:///photag.db")
if not os.path.isfile("photag.db"):
Base.metadata.create_all(self.engine)
Base.metadata.bind = self.engine
self.db_session = sessionmaker(bind=self.engine)
self.session = self.db_session()
def getRootDirs(self):
session = self.session
dirs = session.query(Directory).filter(Directory.parent == None).all()
return dirs
def getDirChildren(self, base_dir):
session = self.db_session()
dirs = session.query(Directory).filter(Directory.parent == base_dir).all()
return dirs
def addDir(self, dir_path, parent=None):
session = self.session
new_dir = session.query(Directory).filter(Directory.path == dir_path).filter(Directory.parent == parent).first()
if not new_dir:
new_dir = Directory(path=dir_path, parent=parent)
session.add(new_dir)
session.commit()
return new_dir
def remDir(self, dir):
subDirs = dir.children
for child in children:
remDir(dir)
medias = dir.medias
for media in medias:
self.session.delete(media)
self.session.delete(dir)
def addMedia(self, filename, directory, commit = True):
session = self.session
new_media = session.query(Media).filter(Media.directory == directory).filter(Media.file_name == filename).first()
if not new_media:
new_media = Media(file_name=filename, directory=directory)
session.add(new_media)
if commit:
session.commit()
return new_media
def walkDir(self, dir_to_walk, commit = True):
full_path = dir_to_walk.getFullPath()
listing = os.listdir(full_path)
for item in listing:
if os.path.isdir(os.path.join(full_path, item)):
self.walkDir(self.addDir(item, dir_to_walk), False)
elif os.path.isfile(os.path.join(full_path, item)):
self.addMedia(item, dir_to_walk, False)
if commit:
self.session.commit()
def walkAllRoots(self):
session = self.db_session()
root_dirs = self.getRootDirs()
for root_dir in root_dirs:
self.walkDir(root_dir)
# return a query based on a string
def stringQuery(self, query_string):
if query_string == "TAG_TREE":
return TagTreeQuery(self)
elif query_string == "WHOLE_TREE" or query_string == "":
return WholeTreeQuery(self)
splits = query_string.split(';')
for split in splits:
if split.startswith("HAS_TAGS"):
tags = split.split(' ')[1:]
tag_obs = []
for tag in tags:
tag_obs.append(self.session.query(Tag).filter(Tag.name == tag).first())
return MediaWithTagsQuery(tag_obs, self)