I'm using a mysql database and I'm finding different results when I query depending on whether I use the search data 'inline' compared to when I use bound data in the execute() subroutine.

The table is called weathercache, with 4 columns, latitude (float), longitude (float), weather(text) and cached(datetime). Both floats are float(8,6).

I can insert the data fine:

use DBI;
$dbh = connect(.........);
$dbh->prepare('INSERT INTO weathercache (latitude, longitude, weather,
+ cached) VALUES (?, ?, ?, NOW())')->execute(50.530998, -4.949000, '')
+;

[download]

But the next line successfully finds this line again if I use:

$sth = $dbh->prepare('SELECT * FROM weathercache WHERE latitude = 50.5
+30998 AND longitude = -4.949000')->execute();

[download]

...but not if I use

$sth = $dbh->prepare('SELECT * FROM weathercache WHERE latitude = ? AN
+D longitude = ?')->execute(50.530998, -4.949000);

[download]

What am I doing wrong here? A float is a float right? Why does it matter how I use it?

Cheers

MattLG

In reply to Difference between inline SQL and bound data by MattLG

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