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Changing the code to use both columns

The next step is to rename the column in the source code model and to use both database columns for the set and get operations. We can change it in the Calculation class:

public class Calculation {    ...    private String sum;    ...    public Calculation(String a, String b, String sum, Timestamp createdAt) {        this.a = a;        this.b = b;        this.sum = sum;        this.result = sum;        this.createdAt = createdAt;    }    public String getSum() {        return sum != null ? sum : result;    }}

To be 100% accurate, in the getSum() method, we should compare something like the last modification column date (not exactly necessary to always take the new column first).

From now on, every time we add a row into the database, the same value is written to ...