Converting .Net API to PHP - php

Question

I have this .Net REST API function modified from the demo for a grid control here: http://gijgo.com/grid/demos/ajax-sourced-data.
However, I am using PHP on the backend.
public JsonResult Get(int? page, int? limit)
{
List<Models.inventory> records;
int total;
using (ApplicationDbContext context = new ApplicationDbContext())
{
var query = context.inventory.Select(p => new Models.inventory
{
id = p.id,
company = p.company,
part = p.part,
year = p.year,
model = p.model,
stock = p.stock,
ic = p.ic,
vin = p.vin,
status = p.status,
bodycolor = p.bodycolor,
condition = p.condition,
comments = p.comments,
miles = p.miles,
price = p.price,
qty = p.qty
});
query = query.OrderBy(q => q.id);
total = query.Count();
if (page.HasValue && limit.HasValue)
{
int start = (page.Value - 1) * limit.Value;
records = query.Skip(start).Take(limit.Value).ToList();
}
else
{
records = query.ToList();
}
}
return this.Json(new { records, total }, JsonRequestBehavior.AllowGet);
}
I have converted the function to PHP but am having difficulty with the pagination because the total records isn't really being sent.
The C# code, filters the data after the query and i'm not sure how to do that with PHP and PostgreSQL.
I also want to return the total number of rows without the limit and offset in the result I suppose I'm going to have to run a 2nd query to return that data,
is that correct or can I do it in another way?
private function GetInventory()
{
$ic=$_request['ic'];
$limit=$_request['limit'];
$offset=$_request['page']-1;
$sql = "SELECT u.id, "
. " (SELECT company FROM urgss.users WHERE id = u.id) AS company, "
. " u.itemname || ' (' || u.part || ')' as part, "
. " u.year, "
. " u.model, "
. " u.stockno AS stock, "
. " u.ic AS ic, "
. " u.vin, "
. " u.status || ' / ' || u.currentstatus AS status, "
. " REGEXP_REPLACE(u.bod_col, '[\[\]]', '', 'g') AS bodycolor, "
. " u.condition, "
. " u.comments, "
. " CASE "
. " WHEN u.miles::integer < 1000 THEN "
. " u.miles::INTEGER * 1000 "
. " ELSE "
. " u.miles::INTEGER "
. " END AS miles, "
. " CASE "
. " WHEN u.rprice > 0 THEN "
. " u.rprice "
. " ELSE "
. " NULL "
. " END AS price, "
. " u.qty "
. "FROM unet u "
. "WHERE ic = '" . $ic. "' "
. "AND year::integer > 0"
. " LIMIT " . $limit . " OFFSET ". ($offset * $limit);
$result = pg_exec($db, $sql);
$rows = pg_fetch_all($result);
echo json_encode($rows);
}

Answer 1

If you remove LIMIT from the query (REMOVE THIS . " LIMIT " . $limit . " OFFSET ". ($offset * $limit);), then there are two options:
Instead of pg_fetch_all you could fetch in a loop and specify the $row_num based on offset and limit:
//get total number of rows
$total = pg_num_rows($result);
//get rows from offset up to limit
$row_num = $offset;
while($row_num < ($offset + $limit) && $rows[] = pg_fetch_assoc($result, $row_num)) {
$row_num++;
}
echo json_encode($rows);
Or pg_fetch_all and slice what you want:
//get total number of rows
$total = pg_num_rows($result);
//get ALL rows
$rows = pg_fetch_all($result);
//get rows from offset up to limit
$rows = array_slice($rows, $offset, $limit);
echo json_encode($rows);
Not sure what new { records, total } does in .NET, but you could return one of these:
return json_encode([$rows, $total]);
//or
return json_encode(['rows' => $rows, 'total' => $total]);