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Since #1046, QETSql::execReadOnly() runs a query with PRAGMA query_only set and switches it off before returning. Switching it off aborts a statement SQLite is still stepping through ("abort due to ROLLBACK"), and QSQLITE has already stepped to the first row by then. A query that produces its rows as it goes -- a UNION ALL without ORDER BY -- therefore came back with its first row only and no error. A sorted query was not affected, because SQLite has read every row before returning the first. Every query from the SQL box of a table, a saved <graphics_table> query and the scripting qet.query() goes through here. The checked run is now finished before query_only is switched off, and a query that passed is run again for the caller. SQLite refuses a write at its first step, so passing that step is what proves a statement reads only; the second run is of a statement already shown to be read-only. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G2d2Zi8BfrYRPX88zhaoFG