Given the same schema, mappers etc, I am trying to join the node table with
itself. If I use the 'console' relation defined
in mapper, sqlalchemy produces invalid sql.
query.join('consoleNodes').select_by(name='konsole23.xx.xxxx.com')
INFO:sqlalchemy.engine.base.Engine.0x..74:SELECT ......
FROM node JOIN node ON node.console_id = node.node_id
WHERE node.name = ? ORDER BY node.oid
INFO:sqlalchemy.engine.base.Engine.0x..74:['konsole23.xx.xxxx.com']
This produces an ambigious column name. How do I get sqlalchemy to use an
alias for the right hand
side join table ?
/kk
On 3/27/07, Karthik Krishnamurthy <[EMAIL PROTECTED]> wrote:
>
> Another issue with the same setup:
>
> node = query.select_by(name='konsole19.xx.xxxx.com')[0]
> print query.select_by(console=node)
>
> The debugging output shows this:
>
> INFO:sqlalchemy.engine.base.Engine.0x..74:SELECT node.cport AS node_cport,
> node.type_id AS node_type_id, node.locshelf AS node_locshelf, node.s_timeAS
> node_s_time,
> node.site_id AS node_site_id, node.console_id AS node_console_id,
> node.locside AS node_locside, node.locarea AS node_locarea,
> node.netswitch_id AS node_netswitch_id, node.bmodule2 AS node_bmodule2,
> node.sport AS node_sport, node.node_id AS node_node_id, node.bplug AS
> node_bplug, node.bmodule AS node_bmodule, node.parent_id AS
> node_parent_id, node.os_id AS node_os_id, node.bport2 AS node_bport2,
> node.backplane AS node_backplane, node.prop_id AS node_prop_id,
> node.status AS node_status, node.model_id AS node_model_id, node.locrow AS
> node_locrow, node.serialno AS node_serialno, node.bootbox2_id AS
> node_bootbox2_id, node.m_time AS node_m_time, node.ytag AS node_ytag,
> node.bplug2 AS node_bplug2, node.loccage AS node_loccage, node.ponumber AS
> node_ponumber, node.name AS node_name, node.racksize AS node_racksize,
> node.bootbox_id AS node_bootbox_id, node.locroom AS node_locroom,
> node.notes AS node_notes, node.bport AS node_bport, node.locrack AS
> node_locrack, node.c_time AS node_c_time, node.pdu AS node_pdu
> FROM node
> WHERE (node.node_id = ?) AND node.console_id = node.node_id ORDER BY
> node.oid
>
> It works when I say instead
> print query.select_by (console_id=node.id)
>
> Shouldn't sqlalchemy be able to construct the right SQL from the
> primaryjoin condition specified in the mapper
> for 'console' ?
>
> /kk
>
>
> This
>
> On 3/27/07, Karthik Krishnamurthy <[EMAIL PROTECTED]> wrote:
> >
> > It works after I specify primary_key in my mapper or allow_null_pks, but
> > not if I specify
> > the column as primary_key in the Table() constructor.
> >
> > Thanks
> > /kk
> >
> > On 3/26/07, Michael Bayer <[EMAIL PROTECTED]> wrote:
> > >
> > >
> > > i notice that neither your table DDL nor your mappers have any notion
> > > of a primary key, so thats not the complete application...whats below
> > > will throw an error immediately.
> > >
> > > but the most likely cause for what youre seeing is that if any
> > > element of the primary key in a result row is "None", no row will be
> > > loaded. this behavior can be changed using the "allow_null_pks"
> > > option on your mapper.
> > >
> > >
> > > On Mar 26, 2007, at 7:17 AM, Karthik Krishnamurthy wrote:
> > >
> > > >
> > > > Hi,
> > > > I find that sqlalchemy isn't creating objects for certain rows.
> > > >
> > > > For example the following code gives me back an OpsDB.Node instance
> > > > query.select_by(name=' konsole12.xx.xx.com')[0]
> > > > whereas
> > > > query.select_by(name=' konsole23.xx.xxx.com')[0]
> > > >
> > > > I have provided below the debugging output gotten by setting
> > > > sqlalchemy.engine and sqlalchemy.orm at DEBUG, the table schema and
> > > > the code that defines the table and the mapper for the said table.
> > > >
> > > > /kk
> > > >
> > > > DEBUG info
> > > > =======================================================
> > > > INFO:sqlalchemy.engine.base.Engine.0x..74:SELECT node.cport AS
> > > > node_cport, node.type_id AS node_type_id, node.locshelf AS
> > > > node_locshelf, node.s_time AS node_s_time, node.site_id AS
> > > > node_site_id, node.console_id AS node_console_id, node.locside AS
> > > > node_locside, node.locarea AS node_locarea, node.netswitch_id AS
> > > > node_netswitch_id, node.bmodule2 AS node_bmodule2, node.sport AS
> > > > node_sport, node.node_id AS node_node_id, node.bplug AS node_bplug,
> > > > node.bmodule AS node_bmodule, node.parent_id AS node_parent_id,
> > > > node.os_id AS node_os_id, node.bport2 AS node_bport2, node.backplane
> > > > AS node_backplane, node.prop_id AS node_prop_id, node.status AS
> > > > node_status, node.model_id AS node_model_id, node.locrow AS
> > > > node_locrow, node.serialno AS node_serialno, node.bootbox2_id AS
> > > > node_bootbox2_id, node.m_time AS node_m_time, node.ytag AS
> > > node_ytag,
> > > > node.bplug2 AS node_bplug2, node.loccage AS node_loccage,
> > > > node.ponumber AS node_ponumber, node.name AS node_name,
> > > node.racksize
> > > > AS node_racksize, node.bootbox_id AS node_bootbox_id, node.locroomAS
> > > > node_locroom, node.notes AS node_notes, node.bport AS node_bport,
> > > > node.locrack AS node_locrack, node.c_time AS node_c_time, node.pduAS
> > > > node_pdu
> > > > FROM node
> > > > WHERE node.name = ? ORDER BY node.oid
> > > > INFO:sqlalchemy.engine.base.Engine.0x..74:[' konsole19.xx.xxxx.com']
> > > > DEBUG:sqlalchemy.orm.query.Query:instances()
> > > > DEBUG:sqlalchemy.engine.base.Engine.0x..74:Row (30021, 106, 2, 2006,
> > > > 91, 106822, u'a', u'E', None, 0, 0, 106818, 0, 0, None, None, 0,
> > > u'',
> > > > 73, u'active', 179, u'19', u'TES113830', None, u'2006-11-30
> > > 19:31:28',
> > > > u'126785', 0, 0, u'', u' konsole19.xx.xxxx.com ', 1, None, 0, u'',
> > > 0, 1,
> > > > 1135015620, u'')
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > DEBUG:sqlalchemy.orm.strategies.LazyLoader:set class-level lazy
> > > loader
> > > > on [EMAIL PROTECTED]
> > > > INFO:sqlalchemy.engine.base.Engine.0x..74:SELECT node.cport AS
> > > > node_cport, node.type_id AS node_type_id, node.locshelf AS
> > > > node_locshelf, node.s_time AS node_s_time, node.site_id AS
> > > > node_site_id, node.console_id AS node_console_id, node.locside AS
> > > > node_locside, node.locarea AS node_locarea, node.netswitch_id AS
> > > > node_netswitch_id, node.bmodule2 AS node_bmodule2, node.sport AS
> > > > node_sport, node.node_id AS node_node_id, node.bplug AS node_bplug,
> > > > node.bmodule AS node_bmodule, node.parent_id AS node_parent_id,
> > > > node.os_id AS node_os_id, node.bport2 AS node_bport2, node.backplane
> > > > AS node_backplane, node.prop_id AS node_prop_id, node.status AS
> > > > node_status, node.model_id AS node_model_id, node.locrow AS
> > > > node_locrow, node.serialno AS node_serialno, node.bootbox2_id AS
> > > > node_bootbox2_id, node.m_time AS node_m_time, node.ytag AS
> > > node_ytag,
> > > > node.bplug2 AS node_bplug2, node.loccage AS node_loccage,
> > > > node.ponumber AS node_ponumber, node.name AS node_name,
> > > node.racksize
> > > > AS node_racksize, node.bootbox_id AS node_bootbox_id, node.locroomAS
> > > > node_locroom, node.notes AS node_notes, node.bport AS node_bport,
> > > > node.locrack AS node_locrack, node.c_time AS node_c_time, node.pduAS
> > > > node_pdu
> > > > FROM node
> > > > WHERE node.name = ? ORDER BY node.oid
> > > > INFO:sqlalchemy.engine.base.Engine.0x..74:['konsole23.xx.xxxx.com ']
> > > > DEBUG:sqlalchemy.orm.query.Query:instances()
> > > > DEBUG: sqlalchemy.engine.base.Engine.0x..74:Row (0, 106, 0, 2006,
> > > 71,
> > > > None, u'a', u'', None, 0, 0, 107751, 0, 0, None, None, 0, u'', 73,
> > > > u'active', 179, u'1', u'', None, u'2006-11-30 19:31:31', None, 0, 0,
> > >
> > > > u'', u'konsole23.xx.xxxx.com', 1, None, 0, u'', 0, 1, 1135127145,
> > > u'')
> > > > Traceback (most recent call last):
> > > > File "test1.py ", line 13, in ?
> > > > node = query.select_by(name='konsole23.ird.yahoo.com')[0]
> > > > IndexError: list index out of range
> > > >
> > > > =======================================================
> > > > The schema:
> > > >
> > > > =======================================================
> > > > sqlite> .schema node
> > > > CREATE TABLE node (
> > > > node_id integer(10) NOT NULL,
> > > > name VARCHAR(255),
> > > > ytag VARCHAR(32),
> > > > type_id integer(10),
> > > > status varchar(32) NOT NULL,
> > > > parent_id integer(10),
> > > > prop_id integer(10),
> > > > site_id integer(10),
> > > > backplane CHAR(1) NOT NULL,
> > > > model_id integer(10),
> > > > os_id integer(10),
> > > > serialno VARCHAR(32) NOT NULL,
> > > > locroom integer(10) NOT NULL,
> > > > loccage integer(10) NOT NULL,
> > > > locarea VARCHAR(8) NOT NULL,
> > > > locrow CHAR(2) NOT NULL,
> > > > locrack integer(10) NOT NULL,
> > > > locside char(1) NOT NULL,
> > > > locshelf integer(3) NOT NULL,
> > > > racksize INTEGER(2),
> > > > bootbox_id integer(10),
> > > > bport integer(10) NOT NULL,
> > > > bmodule integer(10) NOT NULL,
> > > > bplug integer(10) NOT NULL,
> > > > bootbox2_id integer(10),
> > > > bport2 integer(10) NOT NULL,
> > > > bmodule2 integer(10) NOT NULL,
> > > > bplug2 integer(10) NOT NULL,
> > > > console_id integer(10),
> > > > cport integer(10) NOT NULL,
> > > > netswitch_id integer(10),
> > > > sport integer(10) NOT NULL,
> > > > ponumber VARCHAR(32) NOT NULL,
> > > > notes TEXT NOT NULL,
> > > > pdu VARCHAR(255) NOT NULL,
> > > > c_time integer(10) NOT NULL,
> > > > m_time integer(14) NOT NULL,
> > > > s_time integer(10) NOT NULL,
> > > > UNIQUE (node_id),
> > > > UNIQUE (name),
> > > > UNIQUE (ytag));
> > > > =======================================================
> > > >
> > > > code
> > > > =======================================================
> > > > _nodeTable = self._nodeTable = Table(
> > > > 'node', _metadata,
> > > > Column('prop_id', Integer,
> > > > ForeignKey('property.prop_id')),
> > > > Column('site_id', Integer, ForeignKey('site.site_id')),
> > > > Column('os_id', Integer, ForeignKey('os.os_id' )),
> > > > Column('console_id', Integer, ForeignKey('node.node_id'
> > > )),
> > > > Column('bootbox_id', Integer, ForeignKey('node.node_id'
> > > )),
> > > > Column('bootbox2_id', Integer,
> > > > ForeignKey('node.node_id')),
> > > > Column('netswitch_id', Integer,
> > > > ForeignKey('node.node_id')),
> > > > Column('type_id', Integer,
> > > > ForeignKey(' dictionary.dict_id')),
> > > > Column('model_id', Integer, ForeignKey('model.model_id'
> > > )),
> > > > autoload=True
> > > > )
> > > >
> > > > mapper(OpsDB.Node, self._nodeTable, properties={
> > > > 'id': self._nodeTable.c.node_id,
> > > > 'property': relation(OpsDB.Property, backref='nodes'),
> > > > 'site': relation(OpsDB.Site, backref='nodes'),
> > > > 'os': relation(OpsDB.OS, backref='nodes'),
> > > > 'console': relation(
> > > > OpsDB.Node,
> > > > primaryjoin = _nodeTable.c.console_id ==
> > > > _nodeTable.c.node_id,
> > > > remote_side = [_nodeTable.c.node_id],
> > > > backref = 'consoleNodes',
> > > > ),
> > > > 'bootbox' : relation(
> > > > OpsDB.Node,
> > > > primaryjoin = _nodeTable.c.bootbox_id ==
> > > > _nodeTable.c.node_id,
> > > > remote_side=[_nodeTable.c.node_id],
> > > > backref = 'bootboxNodes',
> > > > ),
> > > > 'bootbox2' : relation(
> > > > OpsDB.Node,
> > > > primaryjoin = _nodeTable.c.bootbox2_id ==
> > > > _nodeTable.c.node_id,
> > > > remote_side=[_nodeTable.c.node_id],
> > > > backref = 'bootbox2Nodes',
> > > > ),
> > > > 'switch' : relation(
> > > > OpsDB.Node,
> > > > primaryjoin = _nodeTable.c.netswitch_id ==
> > > > _nodeTable.c.node_id,
> > > > remote_side=[_nodeTable.c.node_id],
> > > > backref = 'switchNodes',
> > > > ),
> > > > 'type' : relation(OpsDB.Dictionary ,
> > > backref='typeNodes'),
> > > > 'model' : relation(OpsDB.Dictionary,
> > > > backref='modelNodes'),
> > > > })
> > > >
> > > >
> > > > >
> > >
> > >
> > > > > >
> > >
> >
>
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