Aviv Palivoda added the comment:
I looked into this error and I think the problem is the sqlite3_stmt_readonly
check in _pysqlite_query_execute (cursor.c line 517):
if (self->connection->begin_statement &&
!sqlite3_stmt_readonly(self->statement->st) && !self->statement->is_ddl) {
if (sqlite3_get_autocommit(self->connection->db)) {
result = _pysqlite_connection_begin(self->connection);
if (!result) {
goto error;
}
Py_DECREF(result);
}
}
As you can see we check if the current statement is not readonly and if so we
start a transaction. The problem is that sqlite3_stmt_readonly return false for
the "begin immediate" statement. When this happens we open a transaction with
_pysqlite_connection_begin and then executing the "begin immediate".
I think this is a error in sqlite as the documentation says:
"ransaction control statements such as BEGIN, COMMIT, ROLLBACK, SAVEPOINT, and
RELEASE cause sqlite3_stmt_readonly() to return true,"
(https://www.sqlite.org/c3ref/stmt_readonly.html)
----------
nosy: +palaviv
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