On 2 May 2010 06:26, Bavithra R <[email protected]> wrote:
> hi friends
>
> I am doing a simple student mark details project.
> for calculating rank I need to compare the total marks one by one.
> To do so i use *for loop.* so atlast while reaching the end of the table it
> shows the following warning.
> *
> Warning*: mysql_result()
> [function.mysql-result<http://127.0.0.1/pro/function.mysql-result>]:
> Unable to jump to row 18 on MySQL result index on line *50*
>
> It is because it has no next value to compare.How to use try..catch
> exception handling in this.?Or any other suggestion.
> Can anybody help me
>
> --Bavithra
>
Commonly the while loop looks like ...
while ($row = mysql_fetch_assoc($result)) {
If you intend to use this for other loops, watch out where the result
of the function is False to indicate the end of the iterations.
while (False !== ($row = mysql_fetch_assoc($result))) {
Whilst this offers nothing extra here, for functions where 0 or "" are
valid responses and False is the "get me out of here" response,
testing for type and value (!==) is important.
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