Function PreventCommandIfReadOnly

src/backend/tcop/utility.c:468–483

* PreventCommandIfReadOnly: throw error if XactReadOnly * * This is useful partly to ensure consistency of the error message wording; * some callers have checked XactReadOnly for themselves. */

 * some callers have checked XactReadOnly for themselves.
 */
void
PreventCommandIfReadOnly(const char *cmdname)
{
	if (XactReadOnly)
		ereport(ERROR,
				(errcode(ERRCODE_READ_ONLY_SQL_TRANSACTION),
		/* translator: %s is name of a SQL command, eg CREATE */
				 errmsg("cannot execute %s in a read-only transaction",
						cmdname)));

	/*
	 * This is also a convenient place to make note that this transaction
	 * needs two-phase commit.
	 */
	ExecutorMarkTransactionDoesWrites();
}

/*
 * PreventCommandIfParallelMode: throw error if current (sub)transaction is