fix: re-Parse unprepared statements in protocol.bind for cursors#1339
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fix: re-Parse unprepared statements in protocol.bind for cursors#1339Solaris-star wants to merge 1 commit into
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When statement_cache_size=0, prepare(name=None) uses the unnamed statement "". Type introspection also uses "", which clobbers the user statement and marks it unprepared. bind_execute already re-Parses when state.prepared is False, but cursor.bind did not. Opening a server-side cursor after prepare then failed with ProtocolViolationError about mismatched bind parameters. Re-Parse before Bind in protocol.bind, and accept ParseComplete in _process__bind, matching bind_execute. Fixes MagicStack#1335
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Description
With
statement_cache_size=0,prepare(name=None)creates the unnamed statement""(since #1245 / 0.31.0). When the result type needs introspection (e.g. an enum), asyncpg's type-introspection query also uses"", which replaces the user statement on the server. The client marks the user statement unprepared.bind_executealready re-Parses whenstate.preparedis False. Cursor paths useprotocol.bind, which did not re-Parse, so:Fix
protocol.bind: ifnot state.prepared, call_send_parse_messagebefore Bind (same asbind_execute)._process__bind: accept ParseComplete (b'1') when re-parsing.statement_cache_size=0+ enum +prepare+cursor.Linked Issue
Closes #1335