Convert "INSERT" MySQL query to Postgresql query - php

Question

I`m stuck for some time to fix this trouble. I followed this article https://www.sitepoint.com/creating-a-scrud-system-using-jquery-json-and-datatables/
to create SCRUD System. But I stuck when I need to add a new record to PostgreSQL.
The working MySQL part of the code is:
$db_server = 'localhost';
$db_username = 'root';
$db_password = '123456';
$db_name = 'test';
$db_connection = mysqli_connect($db_server, $db_username, $db_password, $db_name);
$query = "INSERT INTO it_companies SET ";
if (isset($_GET['rank'])) { $query .= "rank = '" . mysqli_real_escape_string($db_connection, $_GET['rank']) . "', "; }
if (isset($_GET['company_name'])) { $query .= "company_name = '" . mysqli_real_escape_string($db_connection, $_GET['company_name']) . "', "; }
if (isset($_GET['industries'])) { $query .= "industries = '" . mysqli_real_escape_string($db_connection, $_GET['industries']) . "', "; }
if (isset($_GET['revenue'])) { $query .= "revenue = '" . mysqli_real_escape_string($db_connection, $_GET['revenue']) . "', "; }
if (isset($_GET['fiscal_year'])) { $query .= "fiscal_year = '" . mysqli_real_escape_string($db_connection, $_GET['fiscal_year']) . "', "; }
if (isset($_GET['employees'])) { $query .= "employees = '" . mysqli_real_escape_string($db_connection, $_GET['employees']) . "', "; }
if (isset($_GET['market_cap'])) { $query .= "market_cap = '" . mysqli_real_escape_string($db_connection, $_GET['market_cap']) . "', "; }
if (isset($_GET['headquarters'])) { $query .= "headquarters = '" . mysqli_real_escape_string($db_connection, $_GET['headquarters']) . "'"; }
$query = mysqli_query($db_connection, $query);
I managed to write this and it fails to work for PostgreSQL:
$conn_string = "dbname=test user=postgres password=123456";
$query = "INSERT INTO it_companies VALUES ";
if (isset($_GET['rank'])) { $query .= "('" . pg_escape_string($db_connection, $_GET['rank']) . "', "; }
if (isset($_GET['company_name'])) { $query .= "'" . pg_escape_string($db_connection, $_GET['company_name']) . "', "; }
if (isset($_GET['industries'])) { $query .= "'" . pg_escape_string($db_connection, $_GET['industries']) . "', "; }
if (isset($_GET['revenue'])) { $query .= "'" . pg_escape_string($db_connection, $_GET['revenue']) . "', "; }
if (isset($_GET['fiscal_year'])) { $query .= "'" . pg_escape_string($db_connection, $_GET['fiscal_year']) . "', "; }
if (isset($_GET['employees'])) { $query .= "'" . pg_escape_string($db_connection, $_GET['employees']) . "', "; }
if (isset($_GET['market_cap'])) { $query .= "'" . pg_escape_string($db_connection, $_GET['market_cap']) . "', "; }
if (isset($_GET['headquarters'])) { $query .= "'" . pg_escape_string($db_connection, $_GET['headquarters']) . "');"; }
$query = pg_query($db_connection, $query);
The message I gets from the system is: "Add request failed: parsererror"
The Edit and remove functions are working well.
I follow to build this clause from the PGSQL site example:
INSERT INTO films VALUES
('UA502', 'Bananas', 105, '1971-07-13', 'Comedy', '82 minutes');
Any what I`m doing wrong? Thanks!
UPDATE
The echo of the query and the error was the id column. In Mysql code there was no problem with the ID colum. Why when i use pgsql it does?:
INSERT INTO it_companies (rank,company_name,industries,revenue,fiscal_year,employees,market_cap,headquarters)
VALUES ('1', 'asd', 'asd', '1', '2000', '2', '3', 'asdf');
Warning: pg_query(): Query failed: ERROR: duplicate key value violates unique constraint "it_companies_pkey" DETAIL: Key (company_id)=(2) already exists. in C:\WEB\Apache24\htdocs\datatableeditor\data.php on line 121
{"result":"error","message":"query error"
,"data":[]}
UPDATE2
The working code with one bug:
$query = "INSERT INTO it_companies (rank,company_name,industries,revenue,fiscal_year,employees,market_cap,headquarters) VALUES ";
if (isset($_GET['rank'])) { $query .= "('" . $_GET['rank'] . "', "; }
if (isset($_GET['company_name'])) { $query .= "'" . $_GET['company_name'] . "', "; }
if (isset($_GET['industries'])) { $query .= "'" . $_GET['industries'] . "', "; }
if (isset($_GET['revenue'])) { $query .= "'" . $_GET['revenue'] . "', "; }
if (isset($_GET['fiscal_year'])) { $query .= "'" . $_GET['fiscal_year'] . "', "; }
if (isset($_GET['employees'])) { $query .= "'" . $_GET['employees'] . "', "; }
if (isset($_GET['market_cap'])) { $query .= "'" . $_GET['market_cap'] . "', "; }
if (isset($_GET['headquarters'])) { $query .= "'" . $_GET['headquarters'] . "') RETURNING company_id;"; }
echo $query;
After this query, the message "Add request failed: parsererror" is still there. But after a manual refresh of the page, the new data is saved. Any idea why this message apears and not loading the data automatically?
UPDATE 3 - Success
I forgot to remove echo $query; from the code causing the error message.
All works now. Thanks for the help to all! :)

Answer 1

You need a little more work in your query string building.
You only add the open parenthesis ( if rank is present
You only add the closing parenthesis ) if headquarters is present.
Also you need specify what field column get which value, otherwise you end with headquarter name into the fiscal_year field. If columns are not specified the values are add it on the same order as define on the table.
INSERT INTO TABLE_NAME (column1, column2, column3,...columnN)
VALUES (value1, value2, value3,...valueN);
And as other have comment check the $query to see what you have.