MySQL condition

I'm still pretty new with MySQL and I don't know the best way to do this.

I have a table with incremented values, and if the values exceed a certain limit, I'd like to know. So lets say I have this table with a current column and capacity column. A row in current is incremented by user input and I want to know when the value in a current row exceeds or meets its corresponding capacity.

If current is still below the capacity, I would like the query to r开发者_如何学编程eturn true. However, if current meets or exceeds capacity, I would like the query to return false.

Thanks!

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in mysql that's easy:

select (current >= capacity) as exceeded from table

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Add a WHERE clause to do that check in your UPDATE query:

// I assume you mean you want to increment the current column by 1,
// but it's your table so change the SET values as needed
$updated = mysql_query('UPDATE table SET current = current + 1 WHERE id = ' . intval($row_id) . ' AND current < capacity');

Then check mysql_affected_rows() of the UPDATE query:

if (mysql_affected_rows() > 0)
{
    // Success
}