tuxmartin · June 10, 2015 21:54 · Jun 10, 2015
diff --git a/Test.py b/Test.py
@@ -0,0 +1,132 @@
+from sqlalchemy.ext.declarative import declarative_base
+#from sqlalchemy import *
+#from sqlalchemy.orm import *
+
+# Pro entity v podadresari. Podaresar *musi* obsahovat prazdny soubor __init__.py !
+#from entity.User import User
+
+'''
+Zavislosti:
+    # apt-get install python-sqlalchemy
+
+Kompilace:
+    # apt-get install cython
+    $ python setup.py build_ext --inplace
+Pouziti:
+    v adresari s Test.so a db.sqlite3:
+    $ python
+        >>> import Test
+
+'''
+
+from sqlalchemy import create_engine, exists
+from sqlalchemy.orm import relationship, sessionmaker
+from sqlalchemy.schema import Column, ForeignKey
+from sqlalchemy.types import Integer, String
+
+
+Base = declarative_base()
+
+
+class User(Base):
+    __tablename__ = 'user'
+    id = Column(Integer, primary_key=True)
+    name = Column(String, nullable=False)
+    email = Column(String, nullable=False, unique=True)
+    nick = Column(String)
+
+    address_id = Column(Integer, ForeignKey('address.id'))
+    address = relationship("Address", back_populates="user")
+
+class Address(Base):
+    __tablename__ = 'address'
+    id = Column(Integer, primary_key=True)
+    street = Column(String, nullable=False)
+    city = Column(String, nullable=False)
+
+    user = relationship('User', back_populates="address")
+
+    def __init__(self, city='Jicin'): # default value
+        self.city = city
+
+
+class Main():
+    def __init__(self):
+        pass
+
+    def __del__(self):
+        pass
+
+    def run(self):
+        #   INSERT
+        if not session.query(exists().where(User.email == '[email protected]')).scalar():
+            u1 = User()
+            u1.name = "Test user"
+            u1.email = "[email protected]"
+
+            a1 = Address()
+            a1.street = "Str 123"
+            a1.city = "City WTF"
+
+            u1.address = a1
+            session.add(a1)
+            session.add(u1)
+            session.commit()
+
+        #   test, jestli v DB dany zaznam existuje:
+        #print session.query(Address).filter_by(city='City WTF').count()
+        #print bool( session.query(Address).filter_by(city='City WTF').count() )
+
+        #   SELECT
+        if session.query(exists().where(Address.city == 'City WTF')).scalar():
+            a2 = session.query(Address).filter_by(city='City WTF').first()
+            print a2.city
+
+        if bool(session.query(Address).filter_by(city='City WTF').count()):
+            a2 = session.query(Address).filter_by(city='City WTF').first()
+            print a2.city
+
+
+        #   UPDATE
+        if session.query(exists().where(User.email == '[email protected]')).scalar():
+            session.query(User).filter_by(email='[email protected]').update({"nick": "a"})
+            session.commit()
+
+        if session.query(exists().where(User.email == '[email protected]')).scalar():
+            u = session.query(User).filter_by(email='[email protected]').first()
+            u.nick = "b"
+            session.commit()
+
+
+        #   DELETE
+        if session.query(exists().where(User.email == '[email protected]')).scalar():
+            session.query(User).filter_by(email='[email protected]').delete()
+            session.commit()
+
+        if session.query(exists().where(Address.city == 'City WTF')).scalar():
+            session.query(Address).filter_by(city='City WTF').delete()
+            session.commit()
+
+
+if __name__ == '__main__' or __name__ == 'Test':    # http://stackoverflow.com/a/419986/1974494
+                                                    #  __main_ - spusteni jako skript, 'Test' - jako modul
+    #engine = create_engine('mysql://test:test@localhost:3306/test', echo=False)
+    engine = create_engine('sqlite:///db.sqlite3')
+    '''
+        sqlite:///:memory: (or, sqlite://)
+        sqlite:///relative/path/to/file.db
+        sqlite:////absolute/path/to/file.db
+    '''
+    connection = engine.connect()
+    Session = sessionmaker(bind=engine)
+    session = Session()
+
+    Main().run()
+
+    connection.close()
+
+
+
+# http://docs.sqlalchemy.org/en/latest/orm/backref.html
+
+# http://stackoverflow.com/a/30506593/1974494 !!!!!!!!!!!
diff --git a/dump_mysql.sql b/dump_mysql.sql
@@ -0,0 +1,21 @@
+CREATE TABLE address (
+  id INT NOT NULL AUTO_INCREMENT,
+  street VARCHAR(45) NOT NULL,
+  city VARCHAR(45) NOT NULL,
+  PRIMARY KEY (id))
+ENGINE = InnoDB;
+
+CREATE TABLE user (
+  id INT NOT NULL AUTO_INCREMENT,
+  name VARCHAR(45) NOT NULL,
+  email VARCHAR(45) NOT NULL,
+  nick VARCHAR(45) NULL,
+  address_id INT NOT NULL,
+  PRIMARY KEY (id),
+  UNIQUE KEY email_UNIQUE (email),
+  INDEX fk_user_address_idx (address_id ASC),
+  CONSTRAINT fk_user_address
+    FOREIGN KEY (address_id)
+    REFERENCES address(id)
+  )
+ENGINE = InnoDB;
diff --git a/dump_sqlite.sql b/dump_sqlite.sql
@@ -0,0 +1,16 @@
+PRAGMA foreign_keys=OFF;
+BEGIN TRANSACTION;
+CREATE TABLE "address" (
+    "id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
+    "street" TEXT NOT NULL,
+    "city" TEXT NOT NULL
+);
+CREATE TABLE user (
+    "id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
+    "name" TEXT NOT NULL,
+    "email" TEXT NOT NULL,
+    "nick" TEXT,
+    "address_id" INTEGER,
+    FOREIGN KEY(address_id) REFERENCES address(id)
+);
+COMMIT;
diff --git a/setup.py b/setup.py
@@ -0,0 +1,14 @@
+__author__ = 'martin'
+
+# http://docs.cython.org/src/tutorial/cython_tutorial.html
+
+# https://docs.python.org/2/distutils/builtdist.html
+
+from distutils.core import setup
+from Cython.Build import cythonize
+
+setup(
+    ext_modules = cythonize("Test.py")
+)
+
+# python setup.py build_ext --inplace