get_meta, set_meta custom in MYSQL , PHP

1. CREATE TABLE USING MYSQL

DROP TABLE IF EXISTS `options`;
CREATE TABLE `options` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `metakey` varchar(255) NOT NULL,
  `metavalue` varchar(255) NOT NULL,
  `metaupdated` timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),
  PRIMARY KEY (`id`)
);

2. ADD FUNCTION TO CLASS

public function getMeta( $metakey )  {
			$sql="SELECT * from options where metakey='$metakey'";
			$result=$this->conn->query($sql);
			if($result->num_rows>0){
				$row = $result->fetch_assoc();				
			}else{
				$row=false;
			}
			return $row;
		}
		
		public function setMeta( $metakey, $metaValue)  {
			$existornot=$this->getMeta($metakey);
			if($existornot){
				$sql="UPDATE `options` SET
				`metavalue` = '$metaValue',
				`metaupdated` = date('Y-m-d H:i:s')
				WHERE `metakey` = '$metakey'";
				$this->conn->query($sql);
			}else{			
				$sql="INSERT INTO `options` (`metakey`, `metavalue`, `metaupdated`)
				VALUES ('$metakey', '$metaValue', date('Y-m-d H:i:s'))";;
				$this->conn->query($sql);
			}
			return 1;
		}

3. usage

$init->setMeta( 'weekly_price', "10");
$pricings = $init->getMeta('weekly_price');