Beginner PHP: I can't insert data into MYSQL database - php

Question

I'm learning PHP right now and I'm trying to insert data into a MySQL database called "pumpl2" The table is set up like this.
create table product
( productid int unsigned not null auto_increment primary key,
price int(9) not null,
value int(9) not null,
description text
);
I have a form and want to insert the fields from the form in the database. Here is what the php file looks like.
<?php
// create short variable names
$price = $_POST['price'];
$value = $_POST['value'];
$description = $_POST['description'];
if (!$price || !$value || !$description) {
echo "You have not entered all the required details.<br />"
."Please go back and try again.";
exit;
}
# $db = new mysqli('localhost', 'pumpl', '********', 'pumpl2');
if (mysqli_connect_errno()) {
echo "Error: Could not connect to database. Please try again later.";
exit;
}
$query = "insert into pumpl2 values
('".$price."', '".$value."', '".$description."')";
$result = $db->query($query);
if ($result) {
echo $db->affected_rows." product inserted into database.";
} else {
echo "An error has occurred. The item was not added.";
}
$db->close();
?>
When I submit the form, I get an error message "An error has occurred. The item was not added."
Does anyone know what the problem is? Thank you!

Answer 1

This should give you more information:
echo "An error has occurred: " . $db->error();

Answer 2

You are trying to insert into the table called pumpl2, but the CREATE TABLE statement created a table called product.
In addition, as ZeissS noted, you have to consider the following:
CREATE TABLE product (
productid int unsigned not null auto_increment primary key,
price int(9) not null,
value int(9) not null,
description text
);
Query OK, 0 rows affected (0.09 sec)
INSERT INTO product VALUES (1, 1, 'test');
ERROR 1136 (21S01): Column count doesn't match value count at row 1
To solve that error, you need to explicitly specify the list of the columns:
INSERT INTO product (price, value, description) VALUES (1, 1, 'test');
Query OK, 1 row affected (0.03 sec)

Answer 3

You only insert three columns but have four defined in your table. Thus you have to name the columns explicitly:
INSERT INTO tableName (ColumnA, ColumnB, ColumnC) VALUES ('A', 'B', 'C')

Answer 4

$query = "insert into pumpl2.product (price, value, description) values('" .
$db->read_escape_string($price) . "', '".
$db->read_escape_string($value) . "', '" .
$db->read_escape_string($description) . "')";
$result = $db->query($query);
And an obligatory XKCD cartoon:

Answer 5

Your query is wrong, you didn't have the columns specified.
Try it with:
"INSERT INTO pumpl2 (price, value, description) VALUES ('".$price."', '".$value."', '".$description."')"
Besides that, do not use the $_POST values to enter them directly into the database. Search for SQL Injection on this one. Use mysql_real_escape_string on the $_POST data first, or even better use prepared statements.

Answer 6

It could be several reasons.
Try
echo "Errormessage: ".$db->error;
to get more details, why the Insert didn't work.

Answer 7

Your table is called products not pumpl2. Furthermore you should do:
insert into product (price, value, description) values ( ...