Not able to insert into database - php

Question

<?php
require_once '/var/www/html/es/vendor/autoload.php';
class test {
//public $params = array();
public $mysql_con;
public $es_con;
public function __construct($es_username, $es_password, $server_name, $db_username, $db_password, $db_name) {
$params = array();
$params['connectionParams']['auth'] = array(
$es_username,
$es_password,
'Basic'
);
$es_con = new Elasticsearch\Client($params);
if ($es_con) {
$mysql_con = mysqli_connect($server_name, $db_username, $db_password, $db_name);
if (!$mysql_con) {
echo nl2br("Connected successfully to elasticsearch. Please check your credentials for database\n");
}
else {
echo nl2br("Connected successfully to both elasticsearch and database\n") ;
}
}
else {
echo nl2br("Failed to connect to elasticsearch. Please check your credentials\n");
}
}
public function insert() {
$insert_query = "INSERT INTO user (username,firstname,lastname,profile_about) VALUES ('shreyas','shreyas','r','Let us get out !!')";
$run_insert_query = mysqli_query($this->mysql_con, $insert_query);
if ($run_insert_query) {
$select_query = "SELECT * FROM user ORDER BY id DESC LIMIT 1";
$run_select_query = mysqli_query($this->mysql_con, $select_query);
while ($selected_row = mysqli_fetch_array($run_query)) {
$id = $selected_row['id'];
$username = $selected_row['username'];
$firstname = $selected_row['firstname'];
$lastname = $selected_row['lastname'];
$profile_about = $selected_row['profile_about'];
}
$es_insert = array();
$es_insert['body'] = array('id' => $id, 'username' => $username, 'firstname' => $firstname, 'lastname' => $lastname, 'profile_about' => $profile_about);
$es_insert['index'] = 'test';
$es_insert['type'] = 'jdbc';
$es_insert['id'] = $id;
$check_insert = $this->es_con->index($params);
if($check_insert) {
echo nl2br("Successfully inserted to both database and elasticsearch\n");
}
}
else {
echo nl2br("Failed to insert into database hence closing the connection\n");
}
}
}
$connection = new test('pavan', 'password', 'localhost', 'root', 'password', 'sample');
$connection->insert();
?>
I get the following error when I run the code -
mysqli_query() expects parameter 1 to be mysqli, null given in /var/www/html/es/combined.php on line 39
Can someone please help me debug this?I want to insert the data into database as well as elasticsearch.

Answer 1

You did not set $mysql_con to $this->mysql_con in your __construct. Which is why parameter 1 $this->mysql_con is null.
else {
echo nl2br("Connected successfully to both elasticsearch and database\n");
$this->mysql_con = $mysql_con; // Add this line
$this->es_con = $es_con; // After OP's comment, add this line too
}