How to Edit a MySQL Data base from a PHP Site - php

Question

I have built a database named "artStore" and a table within that database named "inventory". I've been able to figure out how to create a new entry to the database, but I'm trying to create a page that can edit those entries.
Here is "inventory" the table I created:
$sql = "CREATE TABLE inventory (
id INT(6) AUTO_INCREMENT PRIMARY KEY,
product VARCHAR(30),
category VARCHAR(30),
seller VARCHAR(30)
)";
Here is what I'm currently trying:
<?php
$resultProduct = "product";
$resultCategory = "category";
$resultSeller = "seller";
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$resultProduct = $row["product"];
$resultCategory = $row["category"];
$resultSeller = $row["seller"];
}
} else {
echo "No Results";
}
?>
<form action="update.php" method="POST">
<label for="product">Product</label>
<input id="product" type="text" name="product" value="<?php echo $resultProduct; ?>">
<br>
<label for="category">Category:</label>
<input id="category" type="text" name="category" value="<?php echo $resultCategory; ?>">
<br>
<label for="seller">Seller:</label>
<input id="seller" type="text" name="seller" value="<?php echo $resultSeller; ?>">
<br>
<input id="id" type="text" name="id" value="<?php echo $resultId; ?>" style="display:none;">
<input type="submit" value="Update My Record">
</form>
What I'm trying in update.php
$product = $_POST['product'];
$category = $_POST['category'];
$seller = $_POST['seller'];
$sql = "INSERT INTO inventory (product, category, seller) VALUES ('$product', '$category', '$seller')";
if ($connection->query($sql) === true) {
echo "Inserted Successfully";
} else {
echo "Error occured in the insert: " . $connection->error;
}
$connection->close();

Answer 1

Try the below code I added hidden field on form and changes on your sql query
<?php
$resultProduct = "product";
$resultCategory = "category";
$resultSeller = "seller";
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$resultProduct = $row["product"];
$resultCategory = $row["category"];
$resultSeller = $row["seller"];
$resultId = $row["id"];
}
} else {
echo "No Results";
}
?>
<form action="update.php" method="POST">
<input type="text" name="update_id" value="<?php echo $resultId; ?>">
<label for="product">Product</label>
<input id="product" type="text" name="product" value="<?php echo $resultProduct; ?>">
<br>
<label for="category">Category:</label>
<input id="category" type="text" name="category" value="<?php echo $resultCategory; ?>">
<br>
<label for="seller">Seller:</label>
<input id="seller" type="text" name="seller" value="<?php echo $resultSeller; ?>">
<br>
<input id="id" type="text" name="id" value="<?php echo $resultId; ?>" style="display:none;">
<input type="submit" value="Update My Record">
</form>
In update.php
$product = $_POST['product'];
$category = $_POST['category'];
$seller = $_POST['seller'];
$updateId = $_POST['update_id'];
$sql = "UPDATE inventory set product = '$product',category='$category',seller='$seller' WHERE id = '$updateId'";

Answer 2

<?php
$resultProduct = "product";
$resultCategory = "category";
$resultSeller = "seller";
$resultId = "product_id";
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$resultProduct = $row["product"];
$resultCategory = $row["category"];
$resultSeller = $row["seller"];
$resultid = $row["id"];
}
} else {
echo "No Results";
}
?>
You were using $resultId in the form but you have not declared and assigned a value to it in the loop.
<form action="update.php" method="POST">
<input id="id" type="hidden" name="id" value="<?php echo $resultId; ?>">
<label for="product">Product</label>
<input id="product" type="text" name="product" value="<?php echo $resultProduct; ?>">
<br>
<label for="category">Category:</label>
<input id="category" type="text" name="category" value="<?php echo $resultCategory; ?>">
<br>
<label for="seller">Seller:</label>
<input id="seller" type="text" name="seller" value="<?php echo $resultSeller; ?>">
<br>
<input type="submit" value="Update My Record">
</form>
<!-- Instead of passing the ID in textbox with display: none you can pass it directly in hidden -->
<?php
$product = $_POST['product'];
$category = $_POST['category'];
$seller = $_POST['seller'];
$product_id = $_POST['id'];
if($product_id!='')//MEANS WE HAVE TO UPDATE THE RECORD
{
// UPDATE QUERY WILL UPDATE THE SAME RECORD ONLY MATCHING THE UNIQUE PRODUCT ID
$sql = "UPDATE inventory SET product = '$product', category = '$category', seller = '$seller' WHERE id = '$product_id' LIMIT 1";
if ($connection->query($sql) === true) {
echo "Updated Successfully";
} else {
echo "Error occured in the insert: " . $connection->error;
}
}
else// If id is blank it means you have a new record
{
$sql = "INSERT INTO inventory (product, category, seller) VALUES ('$product', '$category', '$seller')";
if ($connection->query($sql) === true) {
echo "Inserted Successfully";
} else {
echo "Error occured in the insert: " . $connection->error;
}
}
$connection->close();
?>