select different columns from multiple tables with common variable - php

Question

I have three tables: - food - toys - animals
Each table has the columns - id, color, item
Table toys has additional columns - sn, date and more
Need to select all items from all tables with color = red and get them separately on client side
Something like:
$color = 'red';
$sql = "select * from food, toys, animals where color = :acolor";
$st = $db->prepare($sql);
$st->execute([":acolor" => $color]);
$food = $toys = $animals = '';
while($row = $st->fetch()){
$food .= "<div class='food' data-id = " . $row['food.id'] . ">" . $row['food.item'] . "</div>\n";
$toys .= "<div class='toys' data-id = " . $row['toys.id'] . " data-serial = " . $row['toys.sn'] . " data-date = '" . $row['toys.date'] . "'>" . $row['toys.item'] . "</div>\n";
}
$animals .= "<div class='animals' data-id = " . $row['animals.id'] . ">" . $row['animals.item'] . "</div>\n";
}
$arr = [];
array_push($arr, $food, $toys, $animals);
echo json_encode($arr);
client side
...
data = JSON.parse(data);
$('#wrapfood').html(data[0]);
$('#wraptoys').html(data[1]);
$('#wrapanimals').html(data[2]);
As the final result:
wrapfood should have 5 divs with class food
wraptoys should have 9 divs with class toys
wrapanimals should have 21 divs with class animals
I tried various versions of the above code without success - getting errors on server side.
Any help?

Answer 1

You can use this
$data = array('food' => array(),'toys' => array(),'animals' => array());
$color = 'red';
$foodSql = "select * from food where color = :acolor";
$toySql = "select * from toys where color = :acolor";
$animalSql = "select * from animals where color = :acolor";
$ft = $db->prepare($foodSql);
$tt = $db->prepare($toySql);
$at = $db->prepare($animalSql);
$ft->execute([":acolor" => $color]);
$tt->execute([":acolor" => $color]);
$at->execute([":acolor" => $color]);
$food, $toys, $animals = '';
while($row = $ft->fetch()){
$food .= "<div class='food' data-id = " . $row['food.id'] . ">" . $row['food.item'] . "</div>\n";
}
array_push($data['food'], $food);
while($row = $tt->fetch()){
$toys .= "<div class='toys' data-id = " . $row['toys.id'] . " data-serial = " . $row['toys.sn'] . " data-date = '" . $row['toys.date'] . "'>" . $row['toys.item'] . "</div>\n";
}
array_push($data['toys'],$toys);
while($row = $at->fetch()){
$animals .= "<div class='animals' data-id = " . $row['animals.id'] . ">" . $row['animals.item'] . "</div>\n";
}
array_push($data['animals'],$animals);
echo json_encode($data);
Then on client side you can access the data as
data = JSON.parse(data);
$('#wrapfood').html(data.food);
$('#wraptoys').html(data.toys);
$('#wrapanimals').html(data.animals);

Answer 2

if you want to use a single select statement here is the solution... if you just want a color item and id
SELECT f.* from food f
UNION
SELECT a.* from animals a
UNION
SELECT t.id, t.color,t.item from toys t
WHERE t.color ="red" AND f.color="red" AND a.color="red"
if you want sn and date also
SELECT f.*,null,null from food f
UNION
SELECT a.*,null,null from animals a
UNION
SELECT t.* from toys t
WHERE t.color ="red" AND f.color="red" AND a.color="red"
if your columns of the tales are in the same order as you specified id, color, and item then no problem with the above queries otherwise if the order is different arrange the column names in select statement accordingly...
now you can still use the above query if you want to separate it only client site in the single loop... just concatenate in the select statement.
here is what you can do...
SELECT CONCAT("#food",f.id), CONCAT("#food",f.color),CONCAT("#food",f.item),null,null from food f
UNION
SELECT CONCAT("#animals",a.id),CONCAT("#animals",a.color),CONCAT("#animals",a.item),null,null from animals a
UNION
SELECT CONCAT("#toys",t.id),CONCAT("#toys",t.color),CONCAT("#toys",t.item),CONCAT("#toys",t.sn),CONCAT("#toys",t.date) from toys t
WHERE t.color ="red" AND f.color="red" AND a.color="red"
now we have concatenated the names of the tables with the column now when we display it we can easily filter them with their names...
this is how you filter them later on...
if(substr( $row['id'], 0, 5 ) === "#food"){
echo substr($row['id'],4);
}