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Asked: 2026-05-27T09:00:02+00:00

Does SQLAlchemy support H2 db? I’m using pyramid and would like to connect to

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Does SQLAlchemy support H2 db? I’m using pyramid and would like to connect to H2 db database. If using postgres dialect, I’m getting error like the following:

File "/Users/homecamera/gotocamera/hcadmin/env/lib/python2.7/site-packages/SQLAlchemy-0.7.3-py2.7-macosx-10.4-x86_64.egg/sqlalchemy/dialects/postgresql/base.py", line 871, in initialize
super(PGDialect, self).initialize(connection)
File "/Users/homecamera/gotocamera/hcadmin/env/lib/python2.7/site-packages/SQLAlchemy-0.7.3-py2.7-macosx-10.4-x86_64.egg/sqlalchemy/engine/default.py", line 181, in initialize
self.get_isolation_level(connection.connection)
File "/Users/homecamera/gotocamera/hcadmin/env/lib/python2.7/site-packages/SQLAlchemy-0.7.3-py2.7-macosx-10.4-x86_64.egg/sqlalchemy/dialects/postgresql/base.py", line 910, in get_isolation_level
cursor.execute('show transaction isolation level')
ProgrammingError: Syntax error in SQL statement "SELECT "; expected "TOP, LIMIT, DISTINCT, ALL, *, NOT, EXISTS"; SQL statement:
show transaction isolation level [42001-140]
DETAIL:  org.h2.jdbc.JdbcSQLException: Syntax error in SQL statement "SELECT "; expected "TOP, LIMIT, DISTINCT, ALL, *, NOT, EXISTS"; SQL statement:
show transaction isolation level [42001-140]
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1 Answer

  1. Editorial Team

    AFAIK there’s no official support for either HSQLDB dialects or native H2 dialect.
    Using Postgres dialect with H2 (without using HSQLDB) would definitely result in error you’re getting.

    You might have better luck trying sqlalchemy-jython and using H2 dialect.

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