the query emitted is:
SELECT tb_nv.id, min(bs_3.build_id) AS min_1
FROM tb_nv, tb_brst AS bs_3, tb_brst AS bs
INNER JOIN tb_vers AS v_2 ON bs.version_id = v_2.id
INNER JOIN tb_brst AS bs_2 ON tb_br.id = bs_2.branch_id
the error means that your ON clause refers to a table "tb_br" which is not
otherwise in the FROM clause: "ON tb_br.id = bs_2.branch_id"
the ON clause can only refer to columns from tables that are being SELECTed
from, such as:
SELECT tb_nv.id, min(bs_3.build_id) AS min_1
FROM tb_nv, tb_brst AS bs_3, tb_brst AS bs
INNER JOIN tb_vers AS v_2 ON bs.version_id = v_2.id
INNER JOIN tb_br ON tb_br.id = bs_2.branch_id
INNER JOIN tb_brst AS bs_2 ON tb_br.id = bs_2.branch_id
so you'd need to alter your query to include some indication how tb_br is part
of what's being joined.
On Fri, Mar 17, 2023, at 7:52 PM, 'Dan Stromberg' via sqlalchemy wrote:
>
> Hi people.
>
> I'm having trouble with a test query.
>
> As the subject line says, I'm getting:
> sqlalchemy.exc.OperationalError: (MySQLdb.OperationalError) (1054, "Unknown
> column 'tb_br.id' in 'on clause'")
>
> But it seems like tb_br exists, and has an id column - tb_br being an empty
> table, but still, existent:
> mysql> show create table tb_br;
> +-------+---------------------------------------------------------------------------------------------------------------------------------------------------------+
> | Table | Create Table
>
> |
> +-------+---------------------------------------------------------------------------------------------------------------------------------------------------------+
> | tb_br | CREATE TABLE `tb_br` (
> `id` int(11) NOT NULL AUTO_INCREMENT,
> `name` varchar(45) NOT NULL,
> PRIMARY KEY (`id`)
> ) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
> +-------+---------------------------------------------------------------------------------------------------------------------------------------------------------+
> 1 row in set (0.04 sec)
>
> mysql> select * from tb_br;
> Empty set (0.03 sec)
>
> The query, along with sample models, looks like:
> #!/usr/bin/env python3
>
> """
> A little test program.
>
> Environment variables:
> DBU Your database user
> DBP Your database password
> DBH Your database host
> IDB Your initial database
> """
>
> import os
> import pprint
>
> from sqlalchemy import create_engine, select
> from sqlalchemy.orm import aliased, sessionmaker, declarative_base
> from sqlalchemy.sql.expression import func
> from flask_sqlalchemy import SQLAlchemy
>
> db = SQLAlchemy()
> Base = declarative_base()
>
>
> class NV(Base):
> __tablename__ = "tb_nv"
> __bind_key__ = "testdb"
> __table_args__ = (
> {
> "mysql_engine": "InnoDB",
> "mysql_charset": "utf8",
> "mysql_collate": "utf8_general_ci",
> },
> )
>
> id = db.Column("id", db.Integer, primary_key=True, autoincrement=True)
> builds = db.relationship("Bld", primaryjoin="(NV.id == Bld.variant_id)")
>
>
> class Vers(Base):
> __tablename__ = "tb_vers"
> __bind_key__ = "testdb"
> __table_args__ = (
> {
> "mysql_engine": "InnoDB",
> "mysql_charset": "utf8",
> "mysql_collate": "utf8_general_ci",
> },
> )
>
> id = db.Column("id", db.Integer, primary_key=True, autoincrement=True)
>
>
> class St(Base):
> __tablename__ = "tb_brst"
> __bind_key__ = "testdb"
> __table_args__ = ({"mysql_engine": "InnoDB", "mysql_charset": "utf8"},)
>
> id = db.Column("id", db.Integer, primary_key=True, autoincrement=True)
> version_id = db.Column(
> "version_id",
> db.Integer,
> db.ForeignKey(
> "tb_vers.id",
> name="fk_tb_brst_version_id",
> onupdate="CASCADE",
> ondelete="RESTRICT",
> ),
> nullable=False,
> )
> branch_id = db.Column(
> "branch_id",
> db.Integer,
> db.ForeignKey(
> "tb_br.id",
> name="fk_tb_brst_branch_id",
> onupdate="CASCADE",
> ondelete="RESTRICT",
> ),
> nullable=False,
> )
> build_id = db.Column(
> "build_id",
> db.Integer,
> db.ForeignKey(
> "tb_bld.id",
> name="fk_tb_brst_build_id",
> onupdate="CASCADE",
> ondelete="RESTRICT",
> ),
> nullable=False,
> )
>
> version = db.relationship(
> "Vers", innerjoin=True, primaryjoin="(St.version_id == Vers.id)"
> )
> branch = db.relationship(
> "Br", innerjoin=True, primaryjoin="(St.branch_id == Br.id)"
> )
> build = db.relationship(
> "Bld", innerjoin=True, primaryjoin="(St.build_id == Bld.id)"
> )
>
>
> class Br(Base):
> __tablename__ = "tb_br"
> __bind_key__ = "testdb"
> __table_args__ = (
> {
> "mysql_engine": "InnoDB",
> "mysql_charset": "utf8",
> "mysql_collate": "utf8_general_ci",
> },
> )
>
> id = db.Column("id", db.Integer, primary_key=True, autoincrement=True)
> name = db.Column("name", db.String(45), nullable=False)
>
>
> class Bld(Base):
> __tablename__ = "tb_bld"
> __bind_key__ = "testdb"
> __table_args__ = (
> {
> "mysql_engine": "InnoDB",
> "mysql_charset": "utf8",
> "mysql_collate": "utf8_general_ci",
> },
> )
>
> id = db.Column("id", db.Integer, primary_key=True, autoincrement=True)
>
> name = db.Column("name", db.String(100), nullable=False)
>
> variant_id = db.Column(
> "variant_id",
> db.Integer,
> db.ForeignKey(
> "tb_nv.id",
> name="fk_tb_bld_variant_id",
> onupdate="CASCADE",
> ondelete="RESTRICT",
> ),
> nullable=False,
> )
>
> variant = db.relationship("NV")
>
>
> def display(values):
> """Display values in a decent way."""
> pprint.pprint(values)
>
>
> def connect():
> """
> Connect to Staging for testing.
>
> This is based on
> https://medium.com/analytics-vidhya/translating-sql-queries-to-sqlalchemy-orm-a8603085762b
> ...and ./game-publishing/services/api/deploy/celery/config/staging-base.j2
> """
> conn_str = "mysql://{}:{}@{}/{}".format(
> os.environ["DBU"],
> os.environ["DBP"],
> os.environ["DBH"],
> os.environ["IDB"],
> )
> engine = create_engine(conn_str)
>
> # Added 2023-03-17
> Base.metadata.create_all(engine)
>
> session = sessionmaker(bind=engine)
> sess = session()
> return (engine, sess)
>
>
> def main():
> """A minimal query that exhibits the problem."""
> (engine, session) = connect()
>
> Base.metadata.create_all(engine)
>
> v_2 = aliased(Vers, name="v_2")
> bs = aliased(St, name="bs")
> bs_2 = aliased(St, name="bs_2")
> bs_3 = aliased(St, name="bs_3")
>
> # sqlalchemy.exc.OperationalError: (MySQLdb.OperationalError) (1054,
> "Unknown column 'tb_br.id' in 'on clause'")
> # [SQL: SELECT tb_nv.id, min(bs_3.build_id) AS min_1
> # FROM tb_nv, tb_brst AS bs_3, tb_brst AS bs
> # INNER JOIN tb_vers AS v_2 ON bs.version_id = v_2.id
> # INNER JOIN tb_brst AS bs_2 ON tb_br.id = bs_2.branch_id]
> query = (
> select(NV.id, func.min(bs_3.build_id))
> .select_from(bs)
> .join(v_2, onclause=(bs.version_id == v_2.id))
> .join(bs_2, onclause=(Br.id == bs_2.branch_id))
> )
> result = session.execute(query)
>
> display(result.scalar().all())
>
>
> main()
>
>
> I'm using:
> $ python3 -m pip list -v | grep -i sqlalchemy
> Flask-SQLAlchemy 2.5.1
> /data/home/dstromberg/.local/lib/python3.10/site-packages pip SQLAlchemy
> 1.4.36 /data/home/dstromberg/.local/lib/python3.10/site-packages pip $
> python3 -m pip list -v | grep -i mysql mysqlclient 2.1.1
> /data/home/dstromberg/.local/lib/python3.10/site-packages pip PyMySQL 0.8.0
> /data/home/dstromberg/.local/lib/python3.10/site-packages pip bash-4.2# mysql
> --version mysql Ver 14.14 Distrib 5.7.41, for Linux (x86_64) using EditLine
> wrapper
>
>
> Any hints?
>
> Thanks!
>
>
>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
> To post example code, please provide an MCVE: Minimal, Complete, and
> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
> description.
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>
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--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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