How to use two different records from database? - php

Question

I'm running a query to get results from the database. The results are then saved in an array. I want to know how can I use those results from array to get further results from the database in a single query. Or I'll have to use multiple queries?
$query2="SELECT officeName FROM office
WHERE parentOfficeID='$parent'";
$result2=mysqli_query($connect,$query2);
if(mysqli_num_rows($result2) != 0)
{
$results= array();
while ($row2 = mysqli_fetch_assoc($result2))
{
$results[]=$row2['officeName'];
}
}
The $results array saves the results. I want to use the officeName values individually. Is there any way I use single query? Or I'll have to process each value?

Answer 1

Hi If I understand your question then first you want to fetch some officeName and store them in array and then want to fetch some other info based on that officeName . You can use this one
<?php
$db = new mysqli('localhost','root','','databasename');
$result = mysqli_query($db,"SELECT officeName FROM office WHERE parentOfficeID='$parent'") or die(mysqli_error($db));
$officeName = array();
while($row = mysqli_fetch_assoc($result)){
$officeName[] = $row['officeName'];//store your office name in an array
}
$officeName= join("', '", $officeName);//The join() function returns a string from the elements of an array. It is an alias of the implode() function.
$sql = "SELECT * FROM office WHERE officeName IN ('$officeName')";// query with IN condition
$result1 = mysqli_query($db,$sql) or die(mysqli_error($db));
while($row1 = mysqli_fetch_assoc($result1)){
echo "<pre>";print_r($row1);
}
for more info more about join(). Please read http://www.w3schools.com/php/func_string_join.asp
for mysqli IN condition please read http://www.mysqltutorial.org/sql-in.aspx

Answer 2

To add to #Nyranith, you could also swap out your while statement and use
mysqli_fetch_all($result2, MYSQLI_ASSOC);
Which will return your values as an associative array without the need for you to loop through and build the array yourself.
It's been a really long time since I used mysqli, could need tweaking but here goes.
Here's a better way to go about the process itself:
Assume you have tables: Office and Staff and for some reason, you are binding the office to staff by the office name (bad juju)
$parent = 1;
$query2="SELECT o.officeName, s.name
FROM office AS o
INNER JOIN staff AS s ON o.officeName = s.officeName
WHERE o.parentOfficeID=?";
$stmt = $connect->prepare($query2);
$query = $stmt->bindParam($parent);
$exec = $stmt->execute();
$results2 = mysqli_fetch_all($exec, MYSQLI_ASSOC);
Now, do something with your result array
foreach($results2 as $key => $value) {
//loop through your results an do another query with them. Just like you queried the database to get these results.
}