Convert MySQL to MySQLi (MySQL Improved) involves updating the code to use the new MySQLi functions and objects rather than the old MySQL functions. The MySQLi extension is an improved version of the MySQL extension, and it provides an object-oriented interface as well as support for prepared statements. Here are the general steps to convert MySQL to MySQLi:

1. Connect to the database: Use the mysqli_connect() function to connect to the database. This function takes four parameters: the server name, the username, the password, and the database name.
2. Run queries: Use the mysqli_query() function to run queries on the database. This function takes two parameters: the connection object and the query string. The function returns a result object.
3. Retrieve data: Use the mysqli_fetch_assoc() function to retrieve data from the result object. This function returns an associative array of the current row in the result set.
4. Close the connection: Use the mysqli_close() function to close the connection to the database.
5. Prepared Statements: MySQLi provides support for prepared statements which are a secure way to handle data and protect against SQL injection attacks. You can use the mysqli_prepare() function to prepare a statement and the mysqli_stmt_bind_param() function to bind variables to the placeholders in the statement.

Note that you should check the return values of the functions and check if they are successful or not. It is also important to note that this is a general overview of how to convert MySQL to MySQLi, and your specific project may have additional or different requirements. It’s always a good idea to test your code thoroughly after making the changes.

Convert MySQL to MySQLi

$link = mysql_connect("host", "username", "password");
mysql_select_db("database_name");

mysqli_connect ( "host", "username", "password", "database_name" );

mysql_affected_rows->mysqli_affected_rows($dbconnection)
mysql_close->mysqli_close($dbconnection)
mysql_data_seek->mysqli_data_seek($result,$offset)
mysql_errno->mysqli_errno($dbconnection)
mysql_error->mysqli_error($dbconnection)
mysql_fetch_array->mysqli_fetch_array($result,$type)
mysql_fetch_assoc->mysqli_fetch_assoc($result)
mysql_fetch_lengths->mysqli_fetch_lengths($result)
mysql_fetch_object->mysqli_fetch_object($result,$class,$params)
mysql_fetch_row->mysqli_fetch_row($result)
mysql_field_seek->mysqli_field_seek($result,$number)
mysql_free_result->mysqli_free_result(result)
mysql_get_client_info->mysqli_get_client_info($dbconnection)
mysql_get_host_info->mysqli_get_host_info($dbconnection)
mysql_get_proto_info->mysqli_get_proto_info($dbconnection)
mysql_get_server_info->mysqli_get_server_info($dbconnection)
mysql_info->mysqli_info($dbconnection)
mysql_insert_id->mysqli_insert_id($dbconnection)
mysql_num_rows->mysqli_num_rows($result)
mysql_ping->mysqli_ping($dbconnection)
mysql_query->mysqli_query($dbconnection,$query)
mysql_real_escape_string->mysqli_real_escape_string($dbconnection)
mysql_select_db->mysqli_select_db($dbconnection,$database)
mysql_set_charset->mysqli_set_charset($dbconnection,$charset)
mysql_stat->mysqli_stat($dbconnection)
mysql_thread_id->mysqli_thread_id($dbconnection)

Converting from MySQL to MySQLi (MySQL Improved) is necessary because MySQLi provides several improvements over the older MySQL extension. Some of the reasons why you might want to convert to MySQLi include:

1. Object-Oriented Interface: MySQLi provides an object-oriented interface, which makes it easier to work with and organize your code. The object-oriented interface also makes it easier to handle errors and exceptions.
2. Prepared Statements: MySQLi provides support for prepared statements, which are a more secure way of handling data and protect against SQL injection attacks. Prepared statements allow you to separate the data from the query, making it more difficult for an attacker to inject malicious code into your database.
3. Improved Performance: MySQLi has been optimized for performance and is generally faster than the older MySQL extension. This can be especially important for large and complex databases.
4. Better Error Handling: MySQLi provides more detailed error information, making it easier to troubleshoot and fix problems with your code.
5. Support for Newer Versions of MySQL: MySQLi supports the newer versions of MySQL, while the older MySQL extension may not. This means that if you want to use the latest features of MySQL, you will need to use MySQLi.
6. Deprecation: MySQL extension is deprecating, and it will eventually be removed from PHP. Therefore, it is always recommended to use MySQLi or PDO to connect to the database.

Converting to MySQLi can also be beneficial for projects that are being updated or maintained by other developers, as it will ensure that the code is consistent and up-to-date with the latest best practices.