bpo-44859: Improve error handling in sqlite3 and change some errors #27654
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* MemoryError is now raised instead of sqlite3.Warning when memory is not enough for encoding a statement to UTF-8 in Connection.__call__() and Cursor.execute(). * UnicodEncodeError is now raised instead of sqlite3.Warning when the statement contains surrogate characters in Connection.__call__() and Cursor.execute(). * TypeError is now raised instead of ValueError for non-string script argument in Cursor.executescript(). * ValueError is now raised for script containing the null character instead of truncating it in Cursor.executescript(). * Correctly handle exceptions raised when getting boolean value of the result of the progress handler. * Add may tests covering different exceptional cases.
serhiy-storchaka
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| } | ||
| } else { | ||
| PyErr_SetString(PyExc_ValueError, "script argument must be unicode."); | ||
| sql_len = strlen(sql_script); |
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What about adding a custom AC converter that can extract the string length, so we don't have to iterate over the string again? Is it worth it?
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I think it is not worth. The code is simpler now (some checks were delegated to Argument Clinic), and it I prefer simplicity at the cost of additional strlen(). Custom converter would make it more complex than the original code. strlen() should be called in any case to check for embedded null characters. Now it is called 2 times instead of 1 time. The overhead is not too large.
| sql_len = strlen(sql_script); | ||
| int max_length = sqlite3_limit(self->connection->db, | ||
| SQLITE_LIMIT_LENGTH, -1); | ||
| if (sql_len >= (unsigned)max_length) { |
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| if (sql_len >= (unsigned)max_length) { | |
| if (sql_len >= (size_t)max_length) { |
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How does it convert: int -> unsigned -> size_t or int -> ssize_t -> size_t? The standard specifies what the intermediate conversion the compiler should used, but without looking into it I cannot say that it will be the correct one.
If convert explicitly to unsigned, the conversion sequence will be unambiguous: int -> unsigned -> size_t.
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BTW, that's a neat enhancement of the |
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We should consider changing some more errors, as discussed in #27642 (comment), #27645 (comment), and #27645 (comment) |
Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@innova.no>
memory is not enough for encoding a statement to UTF-8
in Connection.call() and Cursor.execute().
the statement contains surrogate characters
in
Connection.__call__()and Cursor.execute().script argument in Cursor.executescript().
character instead of truncating it in Cursor.executescript().
of the result of the progress handler.
https://bugs.python.org/issue44859