Do I need getters and setters and extra entity constructors?

问题

I am trying to use ORMLite for database persistence in Android project. It looks all good from examples. Once I start to use it, I found I do not completely understand its requirement and behavior.

Let's say I have a class called Bone which I would like to persist.

@DatabaseTable(tableName = "bones")
public class Bone{
// user defined
@DatabaseField(dataType = DataType.STRING)
private String color;
@DatabaseField
private double length;
@DatabaseField
private int quantity;

// db assigned
@DatabaseField(generatedId = true)
private int id;
public Bone(){
}

// constructors
public Bone(String color, int quantity) {
    this(color, quantity, 0);
}
public Bone(String color, int quantity, int id) {
    this.color = color;
    this.quantity = quantity;
    this.id = id;
}

public Bone(Bone old, int id){
    this.color = old.color;
    this.length = old.length;
    this.quantity = old.quantity;
    this.id = id;
}

public String getColor() {
    return color;
}
public double getLength() {
    return length;
}

public int getQuantity() {
    return quantity;
}
public void setLength(double length) {
    this.length = length;
}

public int getId() {
    return id;
}
}

What are the requirements for the names of getters and setters of its fields? Does their names make any difference? Can I use one without getter and setter?
Besides no arg constructor, any other constructor is needed?

Please help.

回答1:

1) What are the requirements for the names of getters and setters of its fields? Does their names make any difference? Can I use one without getter and setter?

There are no requirements for getters and setters. By default ORMLite uses reflection to build the entity fields directly.

If you set the useGetSet = true field of the @DatabaseField annotation then you do neet get/set methods. See the javadocs for the format.

2) Besides no arg constructor, any other constructor is needed?

No. You only need an accessible no-arg constructor for ORMLite to instantiate the object prior to the reflection work.

来源：https://stackoverflow.com/questions/16780874/do-i-need-getters-and-setters-and-extra-entity-constructors

标签

android

ormlite