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MySQLi LIMIT 1 OFFSET 1 not working

Thread began 6/18/2018 7:50 am by Accumike | Last modified 6/19/2018 1:47 pm by Ray Borduin | 24 views | 1 replies |

Accumike

MySQLi LIMIT 1 OFFSET 1 not working

I may be wrong, but it seems that you can't use the MySQL parameter OFFSET to find the penultimate record in a list.

For example, to find a User's previous login, the syntax would be something like:

SELECT id_log, datein_log FROM logger_log WHERE idusr_log= ? ORDER BY id_log DESC LIMIT 1 OFFSET 1

Unfortunately, this throws an error. I can't find the correct syntax on the WebAssist Community Forums, so I came up with a work around.

First find the Last Record, then use the ID of this record to find the Penultimate Record, whose ID will be less than the Last Record, as follows:

<?php
$rsLastLogin = new WA_MySQLi_RS("rsLastLogin",$yourdbconnection,1);
$rsLastLogin->setQuery("SELECT id_log, datein_log FROM logger_log WHERE idusr_log= ? ORDER BY id_log DESC");
$rsLastLogin->bindParam("i", "".$_SESSION['wa_user_id'] ."", "-1"); //colname
$rsLastLogin->execute();
?>

<?php $lastid = $rsLastLogin->getColumnVal("id_log"); ?>

<?php
$rsPenultimateLogin = new WA_MySQLi_RS("rsPenultimateLogin",$yourdbconnection,1);
$rsPenultimateLogin->setQuery("SELECT id_log, datein_log FROM logger_log WHERE idusr_log= ? AND id_log < ? ORDER BY id_log DESC");
$rsPenultimateLogin->bindParam("i", "".$_SESSION['wa_user_id'] ."", "-1"); //colname
$rsPenultimateLogin->bindParam("i", "".$lastid ."", "-1"); //colname2
$rsPenultimateLogin->execute();
?>

Then in your page, display in your preferred format:

<p>Last Login: <?php echo(date('d F Y H:i', strtotime($rsPenultimateLogin->getColumnVal("datein_log")))); ?></p>

A bit longwinded maybe, but I hope this helps anyone with the same issue.

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Ray BorduinWebAssist

You can use:

<?php
$rsPenultimateLogin = new WA_MySQLi_RS("rsPenultimateLogin",$yourdbconnection,1);
$rsPenultimateLogin->setQuery("SELECT id_log, datein_log FROM logger_log WHERE idusr_log= ? ORDER BY id_log DESC");
$rsPenultimateLogin->bindParam("i", "".$_SESSION['wa_user_id'] ."", "-1"); //colname
$rsPenultimateLogin->PageNum = 1;
$rsPenultimateLogin->execute();
?>

The PageNum setting will push the recordset to the second record.

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