| Bug #36539 | data truncation and implicit cast return different values than explicit cast | ||
|---|---|---|---|
| Submitted: | 6 May 2008 15:44 | Modified: | 6 May 2008 17:19 |
| Reporter: | Scott Noyes | Email Updates: | |
| Status: | Verified | Impact on me: | |
| Category: | MySQL Server: Data Types | Severity: | S2 (Serious) |
| Version: | 5.0.38+, 5.1, 6.0 | OS: | Any |
| Assigned to: | CPU Architecture: | Any | |
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Description: An implicit cast of a string containing decimal points returns a different value than an explicit cast of the same string. Issue occurs in 5.0.38 through 5.0.60, 5.1.23, 6.0.4, but not in 5.0.20a. How to repeat: SET SQL_MODE = ''; CREATE TABLE t1 (string varchar(255), implicit int unsigned); INSERT INTO t1 VALUES ('164.64.194', '164.64.194'); INSERT INTO t1 VALUES ('164.64', '164.64'); SELECT string, implicit, CAST(string AS unsigned) AS explicit FROM t1; Output: +------------+----------+----------+ | string | implicit | explicit | +------------+----------+----------+ | 164.64.194 | 16464 | 164 | | 164.64 | 165 | 164 | +------------+----------+----------+ Suggested fix: This particular issue centered around fetching octets from an IP address. Workarounds include using the INET_ATON function instead, using explicit casting on the value before storing in an integer, or using substring functions to retrieve only a single octet part not including the two decimal points.