My attempted solution in the meantime: Render the query, edit, execute. I
have run into several different errors.
query = ... # my complex query, includes params that do not render
with literal_bind.
# Directly edit query text and rebuild to add MAX_EXECUTION_TIME
hint
query_statement_compiled = query.statement.compile()
query_binds = [bindparam(key=name, value=bp.value, type_=bp.type)
for bp, name in query_statement_compiled.bind_names.iteritems()]
query_str = str(query_statement_compiled).replace('"', '`')
sel_ind = query_str.index('SELECT')
# Insert the hint directly after '...SELECT'
hint_str = ' /*+ MAX_EXECUTION_TIME(1000) */'
# hint_str = ''
query_str_with_hint = query_str[:sel_ind + 6] + hint_str + query_str
[sel_ind+6:]
query_stmt_with_hint = text(query_str_with_hint, bindparams=
query_binds)
query = db.session.query(ProvenancePrototype).from_statement(
query_stmt_with_hint)
query.all() # Fails.
On Wednesday, May 8, 2019 at 10:11:58 AM UTC-4, Mike Bayer wrote:
>
> Additionally, those hints seem to be a new feature
> (
> http://mysqlserverteam.com/whats-new-in-mysql-5-7-first-release-candidate/)
>
> for a hint format that was previously not present in MySQL and don't
> seem to be present in MariaDB either, and surprisingly enough they
> look just like Oracle optimizer hints. Unfortunately the MySQL
> dialect in SQLAlchemy does not support this format of MySQL optimizer
> hint at this time, and this would need to be new feature add. It
> also might be fairly complicated to pull off since these hints don't
> apply to all MySQL versions, there might need to be new API features
> added, not sure.
>
> I've added https://github.com/sqlalchemy/sqlalchemy/issues/4667 to
> track this feature.
>
>
> On Wed, May 8, 2019 at 9:31 AM Jacob Jensen <2tim...@gmail.com
> <javascript:>> wrote:
> >
> > I'm trying to use the query API to create a MySQL query with the the
> MAX_EXECUTION_TIME(30000) hint.
> >
> > My code is roughly:
> >
> > from flask_sqlalchemy import SQLAlchemy
> >
> > class MyTable(SQLAlchemy().Model):
> > ...
> >
> > base_query = Sqlalchemy.session.query(MyTable) # This works when I
> execute it.
> > base_query_with_hint = base_query.with_hint(MyTable,
> "MAX_EXECUTION_TIME(30000)")
> > base_query_with_hint.execute() # THIS DOES NOT WORK.
> >
> > str(base_query_with_hint)
> > # Output
> > # Select a, b, c from MyTable MAX_EXECUTION_TIME(30000)
> >
> > The hint is just rendered at the end of the query, apparently!
> >
> > It should render as
> >
> > Select /*+ MAX_EXECUTION_TIME(30000) */ a, b, c from MyTable
> >
> > I want it to behave exactly like
> https://docs.sqlalchemy.org/en/13/core/selectable.html#sqlalchemy.sql.expression.Select.with_hint
>
> but I'm using the Query API instead of the Select API.
> >
> > Another possibility: A commenter in stackoverflow suggested this is an
> issue with the MySQL dialect not the query API.
> >
> >
> > See comments here (they suggested I come to this mailing list):
> https://stackoverflow.com/questions/56030825/sqlalchemy-query-api-not-working-correctly-with-hints
>
> >
> > --
> > 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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http://www.sqlalchemy.org/
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