Prepared statements can be used to prevent SQL injection.There are a lot of vulnerabilities in Web applications today.Prepared Statements use bound parameters and don't combine variables with strings, making it impossible for an attacker to modify a statement.Prepared Statements combine the variable with the compiled statement to separate the variables from the database.The variables are seen as strings and not part of the statement.If you use the methods in the steps below, you won't need to use any other filtering techniques.
Step 1: There is a type of vulnerability in applications that use a database.
There is a vulnerability when a user input is used in a statement.
Step 2: The variable $name will be assigned to the value a user enters into the URL variable.
It's placed directly into the statement, making it possible for the user to change it."$name" is the name of the user and the password is "tbl_user".
Step 3: The statement will be sent to the database.
Instead of returning one password for the user, the statement will return all the passwords in the table tbl_user.This is something you don't want in your applications.
Step 4: The mySQLi query can be created.
The code below can be used to select data from a table.If the name is $_GET['username'], it means that the password is from tbl_ users.Bind a variable to a string.Execute the statement with the help of the $stmt.Get the variables from the query.$stmt is used to retrieve the data.$stmt is used to display the data.Printf("Password for user%s is %sn"), $name, $pass); // Close the prepared statement.The variable $mysqli is the mySQLi Connection Object.
Step 5: The mySQLi INSERT query needs to be created.
The code below is used to INSERT data into a table.$name is the name of the person; $password is their name.Bind the variables to the strings.Execute the statement with the help of the $stmt.// Close the prepared statement.The variable $mysqli is the mySQLi Connection Object.
Step 6: The mySQLi update query can be created.
The code below can be used to update data in a table.If $name, $password, and $mysqli are used, the password will be?Where name is?The variables should be strings.Execute the statement with the help of the $stmt.// Close the prepared statement.The variable $mysqli is the mySQLi Connection Object.
Step 7: The mySQLi DELETE query can be created.
The below script shows how to remove data from a table.If $stmt is $mysqli, it will prepare a Delet from tbl_users.Bind the variable as a string.Execute the statement with the help of the $stmt.// Close the prepared statement.The variable $mysqli is the mySQLi Connection Object.