Java 将db字段映射到特殊类型的POJO

我有一个包含食品数据的数据库，每个数据库都有蛋白质的数据，单位为克，能量单位为千卡等等。这些数据存储为浮点数

我想把它们映射到一个叫做FoodData的特殊POJO对象，它只有一个浮点数，然后是一个表示单位的枚举，比如克、千卡、毫克等等

我该怎么做

这就是我现在拥有的：

FoodItem.java

@Column(name = "energy_kcal") public Float energyKcal;
@Column(name = "energy_kj") public Float energyKj;
@Column(name = "carbohydrates_g") public Float carbohydrates;
@Column(name = "protein_g") public Float protein;
@Column(name = "fibre_g") public Float fibre;
@Column(name = "whole_grain_g") public Float wholeGrain;
@Column(name = "cholesterol_mg") public Float cholesterol;
@Column(name = "water_g") public Float water;
@Column(name = "alcohol_g") public Float alcohol;
@Column(name = "ash_g") public Float ash;
@Column(name = "waste_procent") public Float waste;

public class FoodData {

    private float data;
    private Unit unit;

    public Enum Unit {
         GRAMS, KCAL, MILLIGRAMS
    }
}

FoodData.java

@Column(name = "energy_kcal") public Float energyKcal;
@Column(name = "energy_kj") public Float energyKj;
@Column(name = "carbohydrates_g") public Float carbohydrates;
@Column(name = "protein_g") public Float protein;
@Column(name = "fibre_g") public Float fibre;
@Column(name = "whole_grain_g") public Float wholeGrain;
@Column(name = "cholesterol_mg") public Float cholesterol;
@Column(name = "water_g") public Float water;
@Column(name = "alcohol_g") public Float alcohol;
@Column(name = "ash_g") public Float ash;
@Column(name = "waste_procent") public Float waste;

public class FoodData {

    private float data;
    private Unit unit;

    public Enum Unit {
         GRAMS, KCAL, MILLIGRAMS
    }
}

我想做的是这样的：

@Column(name = "energy_kcal") public FoodData energyKcal = new FoodData(data_from_column, Unit.KCAL);

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但你不是这样做的，你是怎么做的？

看看吧，谢谢！我更多考虑的是注释模型类，而不是查询方式……你的“我想做什么”当然不会编译，也不清楚你想在那里做什么。@NeilStockton Yes sry关于那里的静态类型，使它更加混乱。我想做的是在数据库中有浮点数据，并将它们映射到一个POJO对象，该对象本质上是一对浮点（真实的db数据）和一个枚举？所以FoodData不是一个实体