MySQLi is extension in PHP scripting language which gives access to the MYSQL database.

1. The mysqli_affected_rows() function returns the number of affected rows in the previous SELECT, INSERT, UPDATE, REPLACE,or DELETE query.
2. Syntax
mysqli_affected_rows( connection);

1. A Web database is a database application designed to be managed and accessed through the Internet.
2. In other words, the light databases that support the web applications are also known as Web Databases

(i) In computing, a connection string is a string that specifies information about a data source and the means of connected to it.
(ii) It is passed in code to underlying driver or provider in order to initiate the connection.

Connection function	Close function
1) Before accessing MYSQL Database, connect to Database Server machine via PHP scripting language using Mysqli_connect() Function.	Mysqli_close() Function is used to close an existing opened database connection between PHP scripting and MySQL Database Server.
2) This function requires 4 parameters	This function requires only one parameter.

(i) Mysqli_connect() Function
(ii) Mysqli_close() Function
(iii) Mysqli_query() Function

Syntax:
mysqli_connect("Server Name","User Name","password","DB Name");
Example:

mysqli_affected rows( )	mysqli_fetch_assoc( )
It returns the number of affected rows in the prearvious SELECT, INSERT  UPDATE, REPLACE, or DELETE query.	It fetches a result rowas an associative aray
Return value: An integer >0 indicates the  number of rows affected (0 indicates that no records were affected. '-1' indicates that the query returned an error).	Returns an associative array of strings representing the fetched row. NULL if there are no more rows in result set.
Syntax: mysqli_affected_rows (connection);	Syntax: mysqli fetch_as-soc(result);

Syntax:
mysqli_query("Connection Object","SQL Query")
 

(i) Four Parameters are used to connect to the Database server.
(ii) They are
1.＄ servername -> Database Server server IP address
2.＄ susername -> Database Server User Name
3.＄ password -> Database Server Password
4.＄ DB_Name -> Database Name

Performing Queries: The main goal of MySQL and PHP connectivity is to retrieve and manipulate the data from MySQL database server. The SQL query statements are help in PHP MySQL extension to achieve the objective of MySQL and PHP connection. “mysqli_query” is a function, that helps to execute the SQL query statements in PHP scripting language.
Syntax:
mysqli_query(“Connection Object”,“SQL Query”)
Example:
$con=mysqli_connect(“localhost”,“my_user”,“my_password”,“Student_DB”);
$sql=“SELECT student_name,student_age FROM student”;mysqli_query($con,$sql);

MySQL function in PHP:
In PHP Scripting language many functions are available for MySQL Database connectivity and executing SQL queries.
MySQLi is extension in PHP scripting language which gives access to the MYSQL database. MySQLi extension was introduced version 5.0.0,
The MySQLi extension contains the following important functions which are related to MySQL database connectivity and management.
i) Mysqli_connect() Function
ii) Mysqli_close() Function
iii) Mysqli_query() Function
(i) Database Connections:
Before accessing MySQL Database, connect to Database Server machine via PHP scripting language using Mysqli_connect() Function.
Syntax :
mysqli_connect("Server Name "User Name","Password"DB Name");
This function requires four parameters to connect to database server. Database Server name, Database username, password anda Database Name.
(ii) Managing Database Connections :
The below code describes managing database connection methods and features.

The mysqli_connect function uses these variables to connect Database server to PHP. If connection gets fail, output will be printed with MySQL error code. Otherwise connection is success.
(iii) Performing Queries :
The main goal of MySQL and PHP connectivity is to retrieve and manipulate the data from MYSQL database server. The SQL query statements help in PHP MySQL extension to achieve the objective of MYSQL and PHP connection. "mysqli_query" is a function, that helps to execute the SQL query statements in PHP scripting language.
Syntax:
mysqli_query("Connection Object","SQL Query")
Example:

Closing Connection :
mysqli_close() Function is used to close an existing opened database connection between PHP scripting and MySQL Database Server.

TRUNCATE

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