PHP 循环行值

Question

我只是一个新手，我已经尽力找出如何解决我的问题，但我真的不明白。

我只想知道如何获取循环中当前行的主键/外键值。在我当前的代码中，我获得了最后一行的主键。我已尝试 $_POST[subject_id] 和 $_SESSION[subject_id] 但没有任何反应。请帮我。我应该怎么办？提前致谢!

这是我的 php 文件。

dbconn();
$sql = "select student_id, lastname ||', '|| firstname ||' '|| middlename as
    name, contact_no from tbl_student where student_id in (select student_id
    from tbl_student_block)";
dbclose();
echo "<center>";
insertListMenu ("Select Student: ", "student", $sql." order by name",
    "student_id", "name", "StudSearch", "Search");
echo "</center>";
echo "<br/>";
$student_id = $_POST['student'];
if (($_POST['StudSearch']) == 'Search'){
    dbconn();
    $rs = pg_query("select sj.*, SUM(p.paid_amount) as Total,
    sj.subject_fee - SUM(p.paid_amount) as Balance from tbl_subject as sj,
    tbl_payment_details as p, tbl_student as s, tbl_student_block as sb
    where p.student_block_id = sb.student_block_id and
    s.student_id = sb.student_id and sj.subject_id = sb.subject_id
    and sb.student_id = ".$student_id."
    group by sj.subject_id order by sj.subject_id;");
    displayRecordset($rs);
    dbclose();
}
    $_SESSION['studID'] = $_POST['student'];
if (isset($_POST['Payment']) && ($_POST['Payment'] == 'Add Payment')){
    dbconn();
    $rsbookedit = pg_query("select sj.description, sj.subject_fee,
    SUM(p.paid_amount) as Total, sj.subject_fee - SUM(p.paid_amount) as Balance
    from tbl_subject as sj, tbl_payment_details as p, tbl_student as s,
    tbl_student_block as sb where p.student_block_id = sb.student_block_id
    and s.student_id = sb.student_id and sj.subject_id = sb.subject_id
    and sb.student_id = ".$_SESSION['studID']." and
    sb.subject_id = '".$_SESSION['subID']."' group by sj.subject_id
    order by sj.subject_id;");

    $r2 = pg_fetch_array($rsbookedit, NULL, PGSQL_ASSOC);
    echo var_dump($r2);
    dbclose();
}

这是我的循环:

<?php
    $counter = 1;
    while ($r = pg_fetch_array($rs, NULL, PGSQL_ASSOC)){
?>
    <tr>
    <td><?php echo $counter; ?></td>
    <td><?php echo $r['subject_id']; ?></td>
    <td><?php echo $r['subject_fee']; ?></td>
    <td><?php echo $r['total']; ?></td>
    <td><?php echo  $r['balance']; ?></td>
    <td>
<?php
    if ($r['balance'] > 0){
?>
        <input type="submit" name="Payment" value="Add Payment" />
<?php
    }
    else
        echo "PAID";
?>
    </td>
    </tr>
<?php
    $_SESSION['subID'] = $r['subject_id'];
    $counter++;
    }
?>

Answer 1

尝试在线PGSQL_BOTH，或者您可以将该参数留空，因为它是可选的

while ($r = pg_fetch_array($rs, NULL, PGSQL_BOTH)){