document-api-python/tableaudocumentapi/connection.py at master · jacalata/document-api-python · GitHub

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import xml.etree.ElementTree as ET

from tableaudocumentapi.dbclass import is_valid_dbclass

class Connection(object):

"""A class representing connections inside Data Sources."""

def __init__(self, connxml):

"""Connection is usually instantiated by passing in connection elements

in a Data Source. If creating a connection from scratch you can call

`from_attributes` passing in the connection attributes.

"""

self._connectionXML = connxml

self._dbname = connxml.get('dbname')

self._server = connxml.get('server')

self._username = connxml.get('username')

self._authentication = connxml.get('authentication')

self._class = connxml.get('class')

self._schema = connxml.get('schema')

self._service = connxml.get('service')

self._port = connxml.get('port', None)

self._query_band = connxml.get('query-band-spec', None)

self._initial_sql = connxml.get('one-time-sql', None)

def __repr__(self):

return "'<Connection server='{}' dbname='{}' @ {}>'".format(self._server, self._dbname, hex(id(self)))

@classmethod

def from_attributes(cls, server, dbname, username, dbclass, port=None, query_band=None,

initial_sql=None, authentication=''):

"""Creates a new connection that can be added into a Data Source.

defaults to `''` which will be treated as 'prompt' by Tableau."""

root = ET.Element('connection', authentication=authentication)

xml = cls(root)

xml.server = server

xml.dbname = dbname

xml.username = username

xml.dbclass = dbclass

xml.port = port

xml.query_band = query_band

xml.initial_sql = initial_sql

return xml

@property

def dbname(self):

"""Database name for the connection. Not the table name."""

return self._dbname

@dbname.setter

def dbname(self, value):

"""

Set the connection's database name property.

Args:

value: New name of the database. String.

Returns:

Nothing.

"""

self._dbname = value

self._connectionXML.set('dbname', value)

@property

def server(self):

"""Hostname or IP address of the database server. May also be a URL in some connection types."""

return self._server

@server.setter

def server(self, value):

"""

Set the connection's server property.

Args:

value: New server. String.

Returns:

Nothing.

"""

self._server = value

self._connectionXML.set('server', value)

@property

def username(self):

"""Username used to authenticate to the database."""

return self._username

@username.setter

def username(self, value):

"""

Set the connection's username property.

Args:

value: New username value. String.

Returns:

Nothing.

"""

self._username = value

self._connectionXML.set('username', value)

@property

def authentication(self):

return self._authentication

@property

def dbclass(self):

"""The type of connection (e.g. 'MySQL', 'Postgresql'). A complete list

can be found in dbclass.py"""

return self._class

@dbclass.setter

def dbclass(self, value):

"""Set the connection's dbclass property.

Args:

value: New dbclass value. String.

Returns:

Nothing.

"""

if not is_valid_dbclass(value):

raise AttributeError("'{}' is not a valid database type".format(value))

self._class = value

self._connectionXML.set('class', value)

@property

def port(self):

"""Port used to connect to the database."""

return self._port

@port.setter

def port(self, value):

"""Set the connection's port property.

Args:

value: New port value. String.

Returns:

Nothing.

"""

self._port = value

# If port is None we remove the element and don't write it to XML

if value is None:

try:

del self._connectionXML.attrib['port']

except KeyError:

pass

else:

self._connectionXML.set('port', value)

@property

def query_band(self):

"""Query band passed on connection to database."""

return self._query_band

@query_band.setter

def query_band(self, value):

"""Set the connection's query_band property.

Args:

value: New query_band value. String.

Returns:

Nothing.

"""

self._query_band = value

# If query band is None we remove the element and don't write it to XML

if value is None:

try:

del self._connectionXML.attrib['query-band-spec']

except KeyError:

pass

else:

self._connectionXML.set('query-band-spec', value)

@property

def initial_sql(self):

"""Initial SQL to be run."""

return self._initial_sql

@initial_sql.setter

def initial_sql(self, value):

"""Set the connection's initial_sql property.

Args:

value: New initial_sql value. String.

Returns:

Nothing.

"""

self._initial_sql = value

# If initial_sql is None we remove the element and don't write it to XML

if value is None:

try:

del self._connectionXML.attrib['one-time-sql']

except KeyError:

pass

else:

self._connectionXML.set('one-time-sql', value)

document-api-python/tableaudocumentapi/connection.py at master · jacalata/document-api-python · GitHub

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