How do I set a DB2_SCROLLABLE with hold in PHP? - php

Question

I've been working on creating an object oriented database call class for practice and I've been trying to figure out how to incorporate a scrollable cursor properly. I would like to be able to call this function in order to grab the next 10 records or a different function for the previous 10 records. I've gotten to the point where I can specify an offset for the records through the scrollable cursor but I cannot call the same function again to get the next set without passing in an incremented offset value.
How would I go about being able to specify a number of records per page and simply call getNextSet() or getPrevSet() in order to get the results I want.
My current line of thinking is setting a static variable somewhere and incrementing/deincrementing or resetting it accordingly then use that as the offset value in the functions. However, I believe I heard there was an issue with using static variables in instantiated classes.
Here's the code so far:
<?php
$i5DBconn = db2_connect("*LOCAL", "", "");
if (!$i5DBconn) {
echo "Database Connection failed. SQL Err:";
echo db2_conn_error();
echo "<br>";
echo db2_conn_errormsg();
die();
}
class queryDB{
var $query;
var $outputFunction;
var $parameters;
function performDBCall(){
global $i5DBconn;
$dbStatement = db2_prepare($i5DBconn, $this->query, array('cursor' => DB2_SCROLLABLE));
$i = 1;
foreach ($this->parameters as $param) {
db2_bind_param($dbStatement, $i, 'param', DB2_PARAM_IN);
$i++;
}
$result = db2_execute($dbStatement);
if (!$result){
echo "$this->query failed!. ";
echo 'SQLSTATE value: ' . db2_stmt_error();
echo ' Message: ' . db2_stmt_errormsg();
}
return $dbStatement;
}
}
class invoiceCall extends queryDB {
function testQueryFormatter($dbResultSet, $dataOffset){
$zebraStriping = 1;
?>
//snipped header row formatting
<?php
$rowLimit = 10;
while(($rowData = db2_fetch_array($dbResultSet, $dataOffset)) && ($zebraStriping < $rowLimit)){
list($dataNames) = $rowData;
?>
//snipped data formatting
<?php
$dataOffset++;
}
}
}
$offsetVal = 5;
$testQuery = new invoiceCall();
$testQuery->query = "select invoice#, status, amountpaid, amountbilled, invoicedate, paydate, custname, termofpay, balance from TESTSCHEMA.SAMPLE_INVOICE_TABLE";
//$testQuery->parameters = [8000001];
$resultSet = $testQuery->performDBCall();
$testQuery->testQueryFormatter($resultSet, $offsetVal);
?>
If there are also some coding practices I could improve on, let me know as I am starting my first real journey into Object Oriented PHP.