While the output you've shown could well be considered eroneous, surely
you shouldn't be relying on this sort of logic in a decent piece of code
? Or am I missing something ?
If you're trying to work out which row was inserted most recently,
shouldn't you be using your db handle lastinsert_id parameter ?
*slightly blank look*
P
On Tue, 13 Feb 2001
[EMAIL PROTECTED] wrote:
> From: [EMAIL PROTECTED]
> To: [EMAIL PROTECTED]
> Subject: Caching Bug with AUTO_INCREMENT columns
>
> Description:
> When i use a table with an AUTO_INCREMENT column and
> insert Data in the Table with a NULL Value for the
> AUTO_INCREMENT column, AUTO_INCREMENT sets an new value
> for this column as designed (SELECT * FROM... shows
> this value).
> But a SELECT statement with an 'WHERE column IS NULL'
> returns the last inserted dataset.
>
> If i execute the same SELECT statement again, i get
> the correct output (Empty set).
>
> Does anyone know a workaround for this Problem?
> Executing the SELECT twice is not practicable for me!
>
> Thanks
> Christoph Schemainda
>
>
>
> How-To-Repeat:
>
> CREATE TABLE IF NOT EXISTS BugTest (
> TestID INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
> Name VARCHAR(100) NOT NULL)
> ;
> INSERT INTO BugTest (TestID, Name) VALUES (NULL, 'Test');
>
> SELECT * FROM BugTest WHERE TestID IS NULL;
> SELECT * FROM BugTest WHERE TestID IS NULL;
>
>
> The firsr SELECT creates the output:
>
> +--------+------+
> | TestID | Name |
> +--------+------+
> | 1 | Test |
> +--------+------+
> 1 row in set (0.00 sec)
>
>
>
> Fix:
>
>
> Synopsis: Caching Bug with AUTO_INCREMENT columns
> Submitter-Id: ???
> Originator: Christoph Schemainda
> Organization: TWT Gmbh
> MySQL support: none
> Severity: serious
> Priority: high
> Category: mysqld, mysql client
> Class: sw-bug
> Release: mysql-3.23.32
>
> Exectutable: mysqld-nt
> Environment: I used all the default settings
> System: Win200
> Compiler: ??? (Binary distribution used)
> Architecture: i686
>
>
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