2 files changed, 79 insertions, 0 deletions
diff --git a/heap/ebus/sql/__init__.py b/heap/ebus/sql/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/heap/ebus/sql/__init__.py
diff --git a/heap/ebus/sql/model.py b/heap/ebus/sql/model.py
new file mode 100644
index 0000000..7e21e82
--- /dev/null
+++ b/heap/ebus/sql/model.py
@@ -0,0 +1,79 @@
+from datetime import datetime
+from sqlalchemy import Column, Integer, Float, DateTime, String, ForeignKey
+from sqlalchemy.orm import relationship, backref
+from sqlalchemy.ext.declarative import declarative_base
+
+ModelBase = declarative_base()
+
+class Sensor(ModelBase):
+    __tablename__ = 'sensor'
+    
+    id = Column(Integer, primary_key=True)
+    name = Column(String)
+    description = Column(String, default="")
+
+    def __init__(self, name, description=""):
+        self.name = name
+        self.description = description
+        
+    def __repr__(self):
+        return "<Sensor('%s','%s','%s')>" % (self.id, self.name, self.description)
+
+# http://www.sqlalchemy.org/docs/05/reference/ext/declarative.html#inheritance-configuration
+class Value(ModelBase):
+    __tablename__ = 'value'
+
+    id = Column(Integer, primary_key=True)
+    timestamp = Column(DateTime)
+    sensor_id = Column(Integer, ForeignKey("sensor.id"))
+    sensor = relationship(Sensor, backref=backref('values', order_by=timestamp))
+
+    discriminator = Column('type', String(50))
+    __mapper_args__ = {'polymorphic_on': discriminator}
+
+    def __init__(self, sensor, timestamp=datetime.now()):
+        self.timestamp = timestamp
+        self.sensor  = sensor
+
+    def __repr__(self):
+        return "<Value('%s','%s','%s','%s'>" % (self.id, self.sensor, self.value, self.timestamp)
+
+    def value(self):
+        raise NotImplementedException()
+
+class ValueFloat(Value):
+    __mapper_args__ = {'polymorphic_identity': 'float'}
+    value_float = Column(Float(precision=4))
+    
+    def __init__(self, sensor, value, timestamp=datetime.now()):
+        Value.__init__(self, sensor, timestamp)
+        self.value_float = value
+
+    def value(self):
+        return self.value_float
+
+class ValueInt(Value):
+    __mapper_args__ = {'polymorphic_identity': 'int'}
+    value_int = Column(Integer)
+
+    def __init__(self, sensor, value, timestamp=datetime.now()):
+        Value.__init__(self, sensor, timestamp)
+        self.value_int = value
+
+    def value(self):
+        return self.value_int
+
+class ValueString(Value):
+    __mapper_args__ = {'polymorphic_identity': 'string'}
+    value_string = Column(String)
+
+    def __init__(self, sensor, value, timestamp=datetime.now()):
+        Value.__init__(self, sensor, timestamp)
+        self.value_string = value
+
+    def value(self):
+        return self.value_string
+
+
+
+