Thank you, Mike, but aren't I using the correct dialect with this create_engine() command?
* qry_engine = create_engine('mysql+pymysql://' + db_uid + ':' + db_pw + '@' + db_addr, connect_args=connect_args, pool_recycle=3600, echo=False, future=True)* Or, am I missing something? (BTW, I'm using core, not ORM). Thanks again! Ben On Friday, May 12, 2023 at 4:48:45 PM UTC-4 Mike Bayer wrote: > > > On Fri, May 12, 2023, at 4:30 PM, Benjamin Taub wrote: > > I have code that worked under SQLAlchemy 1.4 but recently upgraded to 2. I > am using the add_columns() method to add columns to an existing SQL > statement. The resultant queries sometimes, but not always, crash. I > believe the issue happens when the schema/database name (I'm using MySQL) > starts with a number. When the schema name starts with a letter, the result > runs fine. However, when it starts with a number, the query double-quotes > the schema name, causing the query to crash. > > Here is an example... > My code: *sql = sql.add_columns(self.tbl.c[field])* > > When the schema holding self.tbl.c[field] starts with a letter > (c6961a19b7ed031ce902f056c725b3e3), the following SQL is generated: > > *SELECT NULL AS "Application Id", NULL AS "First Name", NULL AS "Last > Name", NULL AS "Email", > c6961a19b7ed031ce902f056c725b3e3.t_31392eb2e6980f4d5082b7861182f2b4.master_key > > FROM c6961a19b7ed031ce902f056c725b3e3.t_31392eb2e6980f4d5082b7861182f2b4* > > However, when the schema name starts with a number > (283ac7717fe770c5ed6d425c0c739cba), the following SQL results: > > *SELECT NULL AS "Application Id", NULL AS "First Name", NULL AS "Last > Name", NULL AS "Email", > "283ac7717fe770c5ed6d425c0c739cba".t_59a33cbea3617986d810e9fbae60ba19.master_key > > FROM "283ac7717fe770c5ed6d425c0c739cba".t_59a33cbea3617986d810e9fbae60ba19* > > Note the double quotes around the schema name. This second SQL crashes as > invalid. Back quotes (`) would probably work fine in this situation, and > could be helpful, but double quotes (") are, I think, the cause of my > problem. > > Is there some parameter or assumption that I'm not understanding, or did I > find a bug? > > > The quoting, if it were the correct quoting format, should be fine. As > to why it's the quote char and not the backtick, are you compiling these > queries manually? You would want to make sure a MySQL dialect is in use, > which would be using backticks for quoting, unless that dialect were > initialized against a MySQL database that has ANSI_QUOTES set. > > TL;DR quoting is a new thing here but SQLAlchemy should render the correct > quotes when used with the MySQL dialect. > > Here's a demo: > > from sqlalchemy import Column > from sqlalchemy import create_engine > from sqlalchemy import Integer > from sqlalchemy import select > from sqlalchemy import String > from sqlalchemy.orm import declarative_base > Base = declarative_base() > > > class A(Base): > __tablename__ = 't_59a33cbea3617986d810e9fbae60ba19' > > __table_args__ = { > "schema": "283ac7717fe770c5ed6d425c0c739cba" > } > id = Column(Integer, primary_key=True) > data = Column(String) > > e = create_engine("mysql://") > > stmt = select(A) > > print(stmt.compile(e)) > > output: > > SELECT `283ac7717fe770c5ed6d425c0c739cba`. > t_59a33cbea3617986d810e9fbae60ba19.id, > `283ac7717fe770c5ed6d425c0c739cba`.t_59a33cbea3617986d810e9fbae60ba19.data > FROM `283ac7717fe770c5ed6d425c0c739cba`.t_59a33cbea3617986d810e9fbae60ba19 > > > > > Thank you! > Ben > > > > -- > 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. > --- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sqlalchemy/76d38390-e17f-4b90-a438-ee078944b5ffn%40googlegroups.com > > <https://groups.google.com/d/msgid/sqlalchemy/76d38390-e17f-4b90-a438-ee078944b5ffn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > > -- 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. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/a11f244c-e91e-4cfa-a093-037a5f19eba9n%40googlegroups.com.