<? php
class DbOperation
{{
// database connection link
Private With $;
// class constructor
The ceremony __conversation())
{{
// Getting the DbConnect.php file
require once dirname()__FILE__) . ‘/DbConnect.php’;
// Create a DbConnect object to connect to the database
$ Db = New DbConnect());
// starting our connection link of this class
// By calling method connect of DbConnect class
This $->With = $ Db->connect());
}
// method will create a new student
public The ceremony Creator()$ Name,$ Username,$ Pass){{
// First we will check whether the student is already registered or not
If ()!This $->isStudentExists()$ Username)) {{
// encrypt password
$ Password = md5()$ Pass);
// generate an API key
$ Apology = This $->GenerApiKey());
// a statement crating
$ stmt = This $->With->ready()“INSERT INTO students (name, username, password, api_key) value (?,?,?)?”);
// binding parameters
$ stmt->bind_param()“ssss”, $ Name, $ Username, $ Password, $ Apology);
// law violation
$ Result = $ stmt->Executed());
// Close the statue
$ stmt->Close());
// If the law is executed successfully
If ()$ Result) {{
// Returning 0 means the student is successfully created
The return 0;
} other {{
// Returning 1 means failed to create a student
The return Have 1;
}
} other {{
// returning 2 means the user already exists in the database
The return 2;
}
}
// method for student login
public The ceremony Student lojin()$ Username,$ Pass){{
// Generating Password Hash
$ Password = md5()$ Pass);
// create query
$ stmt = This $->With->ready()“Select * from students where username =? And password =?”);
// binding parameters
$ stmt->bind_param()“ss”,$ Username,$ Password);
// executing the query
$ stmt->Executed());
// get results
$ stmt->store_result());
// get results
$ num_rows = $ stmt->num_row;
// Close the statue
$ stmt->Close());
// If the result value is greater than 0 then the user is found in the database with the given username and password
// So the truth is returning
The return $ num_rows>0;
}
// This method will return the details of the student
public The ceremony Get firm()$ Username){{
$ stmt = This $->With->ready()“Select * from students where username =?”);
$ stmt->bind_param()“s”,$ Username);
$ stmt->Executed());
// Getting the student result array
$ Student = $ stmt->get_result())->fetch_assoc());
$ stmt->Close());
// return to student
The return $ Student;
}
// check if a student already exists
Private The ceremony isStudentExists()$ Username) {{
$ stmt = This $->With->ready()“Select id from students where username =?”);
$ stmt->bind_param()“s”, $ Username);
$ stmt->Executed());
$ stmt->store_result());
$ num_rows = $ stmt->num_row;
$ stmt->Close());
The return $ num_rows > 0;
}
// method to get the assignment
Private The ceremony getAssignments()$ Id){{
$ stmt = This $->With->ready()“Select * students_id = in FFROM assignment?”);
$ stmt->bind_param()“I”,$ Id);
$ stmt->Executed());
$ Assignment = $ stmt->get_result())->fetch_assoc());
The return $ Assignment;
}
/ *
* User checking methods are valid or not using API key
* I will not write comments for every method because each method does the same thing
* * /
public The ceremony isValidStudent()$ Ap_k) {{
// make a statement
$ stmt = This $->With->ready()“Where is the select id from students api_key =?”);
// binding parameter to statement with this
// Question marks will be replaced with actual values
$ stmt->bind_param()“s”, $ Ap_k);
// execute the statement
$ stmt->Executed());
// Storing the result
$ stmt->store_result());
// getting rows from database
// As API Key is always unique so we will either get one row or no row
$ num_rows = $ stmt->num_row;
// Close the statue
$ stmt->Close());
// Returning true if the received row is greater than 0 means the user is valid
The return $ num_rows > 0;
}
// This method will generate a unique API key
Private The ceremony GenerApiKey()){{
The return md5()Bodiless()Rand()), True));
}
}
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