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I know that PreparedStatements avoid/prevent SQL Injection. How does it do that? Will the final form query that is constructed using PreparedStatements will be a string or otherwise?

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Try using the below code:

PreparedStatement stmt = conn.createStatement("INSERT INTO students VALUES('" + user + "')");


Otherwise, use the below code:

PreparedStatement stmt = conn.prepareStatement("INSERT INTO student VALUES(?)");

stmt.setString(1, user);


Note: If the "user" came from user input and the user input was like 

Robert'); DROP TABLE students; --

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