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Add note about sending multiple statements in the same query

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Close #1214
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Daniele Varrazzo 2021-05-20 14:00:39 +02:00
parent 19eb047a41
commit 7479e6b31e
1 changed files with 14 additions and 0 deletions
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doc/src/usage.rst
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@ -783,6 +783,20 @@ A few other transaction properties can be set session-wide by the
change the isolation level. See the `~connection.set_session()` method for all change the isolation level. See the `~connection.set_session()` method for all
the details. the details.
.. note::
When multiple statements are executed in the same query, separated by
semicolon, PostgreSQL wraps them in a transaction. This means that
statements which cannot run in a transaction must be executed separately::
# This doesn't work
cur.execute("DROP DATABASE foo; DROP DATABASE bar;")
If you are wondering why the above works in :program:`psql`, that's
because :program:`psql` parses the queries and splits them on semicolon
before sending them. `!psycopg2` doesn't parse the query, so these
statements must be executed on their own.
.. index:: .. index::
single: with statement single: with statement