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Java application security best practices

public void prepStatmentExample(String parameter) throws SQLException {
   Connection connection = DriverManager.getConnection(DB_URL, USER, PASS);
   String query = "SELECT * FROM USERS WHERE lastname = ?";
   PreparedStatement statement = connection.prepareStatement(query);
   statement.setString(1, parameter);
   System.out.println(statement);
   ResultSet result = statement.executeQuery();

   printResult(result);
}

Source: snyk.io

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