concatenate 3 columns with MySQL in PHP - php

Question

I have an Android app that will POST the category variable to my PHP. In my PHP i wand to find the category (column) the buyer is interested in and then in that row concatenate the 3 other columns from that same row. Then save that into a variable which i will echo out.
i realize there are multiple products listed in the same category but that is a different question.
PHP code:
<?php
$conn = mysqli_connect("phpmyadmin.cvw71h2krjrb.us-east-1.rds.amazonaws.com", "phpmyadmin", "phpmyadmin", "Products");
$Category = $_POST["Category"];
//$sql_query = "select Product_Category from Products where Product_Category like '$Category'";
$sql_query = "select concat(Product_Owner_Email,'_',Product_Name,'_', Product_Key_Code) as productkeyword from table where <Product_Category like '$Category'>";
$result = mysqli_query($conn, $sql_query);
if(mysqli_num_rows($result) > 0 ){
$row = mysqli_fetch_assoc($result);
$Product_Owner_Email = $row['Product_Owner_Email'];
$Product_Name = $row['Product_Name'];
$Product_Key_Code = $row['Product_Key_Code'];
}
mysqli_close($conn);
echo $ProductKeyWord;
?>
How can i concatenate 3 columns with MySQL in PHP?
also
On my app the echo back is ""
...................................................................... ANSWER BELOW............................................................
<?php
ini_set('display_errors',1); ini_set('display_startup_errors',1); error_reporting(E_ALL);//This code is used so if i test the PHP in the browser itll tell me any errors or warnings!!
$conn = mysqli_connect("XXXX", "XXXX", "XXXX", "Products");
$Category = $_POST["Category"];
$sql = "SELECT Product_Owner_Email, Product_Name, Product_Key_Code FROM Product_Details WHERE Product_Category LIKE '$Category'
LIMIT 0 , 30";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo $row["Product_Owner_Email"]. "_" . $row["Product_Name"]. "_" . $row["Product_Key_Code"] . " ";
}
} else {
echo "0 results";
}
$conn->close();
?>
the answer actually returns every "product" in the $Category

Answer 1

You can use the below query:
select concat(Product_Owner_Email,'_',Product_Name,'_', Product_Key_Code) as productkeyword from table where <where condition>
I have updated your code, now try this.
$conn = mysqli_connect("phpmyadmin.cvw71h2krjrb.us-east-1.rds.amazonaws.com", "phpmyadmin", "phpmyadmin", "Products");
$Category = $_POST["Category"];
//$sql_query = "select Product_Category from Products where Product_Category like '$Category'";
$sql_query = "select Product_Owner_Email,Product_Name,concat(Product_Owner_Email,'_',Product_Name,'_',Product_Key_Code) as productkeyword from Products where Product_Category like '".$Category."'";
$result = mysqli_query($conn, $sql_query);
if(mysqli_num_rows($result) > 0 ){
$row = mysqli_fetch_assoc($result);
$Product_Owner_Email = $row['Product_Owner_Email'];
$Product_Name = $row['Product_Name'];
$Product_Key_Code = $row['productkeyword'];
}
mysqli_close($conn);
echo $Product_Key_Code;
?>