At 12:48 PM -0500 2/22/01, Joe and Nancy M wrote:
>I finally got my ISP to resolve the issues with connecting to my db.
>I have a test table in the database named test. I have 3 fields;
>ID(20Char), PRICE(int),QTY(int). I am using php (this is what my
>ISP supports and suggested).
>
>I can connect using:
><?php
>
>$link = mysql_connect ("localhost.domainnamehere.com.",
>"usernameherel", "passwordhere")
>
>or die ("Could not connect");
>
>
>?>
>
>I can draw the data out using this sample code:
>
><?php
>
>$query = "SELECT ID, PRICE, QTY
>
>FROM test
>
>where PRICE=3";
>
>$result = mysql_query ($query)
>
>or die ("Query failed");
>
># fetch rows in reverse order
>
>for ($i = mysql_num_rows ($result) - 1; $i >=0; $i--) {
>
>if (!mysql_data_seek ($result, $i)) {
>
>printf ("Cannot seek to row %d\n", $i);
>
>continue;
>
>}
>
>if(!($row = mysql_fetch_object ($result)))
>
>continue;
>
>printf ("%s %s %s<BR>\n", $row->ID, $row->PRICE, $row->QTY);
>
>}
>
>mysql_free_result ($result);
>
>?>
>
>
>
>1. I can not seem to get the syntax correct to select where the
>ID=text value. I get parse errors with almost every scenario. What
>is the correct string to select where a character field is equal to
>a value???
You need to single quote the value:
$query = "SELECT ID, PRICE, QTY FROM test where id='text value'";
>2. I primarily need to select one record from the table and display
>the PRICE on the webpage and show a hyperlink "buyme" where QTY is
>gt 0. Does someone have a sample piece of php that will handle
>this??
Well, this is a bit of a vague description, but here goes:
$id = 'some value';
$query = "SELECT id,price,qty FROM test WHERE id='$id'";
$result = @mysql_query($query) or die('Arrrghhh....');
if (mysql_num_rows($result) != 1)
{
# Do some error checking here: no record found or multiple
records w/same id
}
else
{
echo '<a href="your_buyme_program.php?id=', urlencode($id),
'&qty=1">Buy one now</a>';
}
Also, there are a few things to note about the code you originally
posted (above).
* you do not have an 'order by' in your sql statement. MySQL - and
any relational database - will not necessarily return the results in
any particular order without one. This will probably bollix up your
fetching in 'reverse order'...there is no particular 'forward' order,
so there ain't a REVERSE order.
* assuming you actually want the order to be by ID, why not let the
database handle as much of the work as possible? It's faster at it
than you & php:
$query = "SELECT ID, PRICE, QTY FROM test where PRICE=3 order
by id desc";
# 'desc' means to sort in descending order - ie, from z -> a
$result = mysql_query ($query) or die ("Query failed");
while ($d = mysql_fetch_object($result))
{
printf ("%s %s %s<BR>\n", $row->ID, $row->PRICE, $row->QTY);
}
mysql_free_result ($result);
>
>
>
>Thanks, I am running very short on time!!!!
>
>Joe.
--
+--- "They've got a cherry pie there, that'll kill ya" ------------------+
| Steve Edberg University of California, Davis |
| [EMAIL PROTECTED] Computer Consultant |
| http://aesric.ucdavis.edu/ http://pgfsun.ucdavis.edu/ |
+-------------------------------------- FBI Special Agent Dale Cooper ---+
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