php+mysqli uses object-oriented method to update database instance, mysqli object-oriented_PHP tutorial

//Step one: Create data connection object
$mysqli = new MySQLi("localhost","root","123456");//Default MySQL class, its properties and methods can be found in the manual
if($mysqli->connect_error){//connect_error is an attribute and an error is reported
die("Database connection failed: ".$mysqli->connect_errno."--".$mysqli->connect_error); // connect_errno: error number
}
$mysqli->select_db("liuyan");//Select database
$mysqli->query("set names 'GBK'");

//Step 2: Update one of the information, the code is as follows
$sql = "update news set title='Ye Shiwen wins swimming World Cup' where id=17";
//Step 3: Execute
$res = $mysqli->query($sql);//Unlike the return value of select, the return value of update is true (if successful), otherwise it returns false
//Determine whether the execution is successful
if(!$res){
echo "Failed to update data";
}else{
if($mysqli->affected_rows>0){//$mysql->affected_rows: Returns the number of database rows affected by the previous operation
echo "Data updated successfully";
}else{
echo "Execution successful, but no data updated";//For example, when you execute this code for the second time, there will be no data update
}
}
//Close the database connection. Unlike select, there is no need to release the query result set
$mysqli->close();
?>