Java 如何从类型为map的数据库中检索值

有一个从数据库填充的映射：

CREATE TABLE `cheese_tbl` (
  `id` int(10) DEFAULT NULL,
  `description` varchar(100) DEFAULT NULL,
  `weight` float DEFAULT NULL,
  `price` float DEFAULT NULL,
  `mfg_date` date DEFAULT NULL,
  `UseBeforeInMonths` int(3) DEFAULT NULL,
  `cheeseType` varchar(20) DEFAULT NULL,
  `protein` float DEFAULT NULL,
  `vitaminB1` float DEFAULT NULL,
  `fat` float DEFAULT NULL
) 

INSERT INTO `cheese_tbl` VALUES 
(1001,'Mozzarella Cheese - Best for Pizza Preparation',200,200,'2014-01-09',12,'Mozzarella',30,0.57,0.33),
(1002,'Goat Cheese Low calories -Easy Spread',300,300,'2014-01-10',3,'Easy_Spread',0.33,33.99,0.57),
(1003,'Cottage Cheese High Protine and Energy',400,400,'2014-05-28',6,'Cottage',0.33,20.2,0.57);

到

更好的是

if(srs.getString("CheeseType").equals("Mozzarella"))
    cheese.setCheeseType(CheeseType.Mozzarella);             
else if(srs.getString("CheeseType").equals("Easy_Spread"))
    cheese.setCheeseType(CheeseType.Easy_Spread);
else if(srs.getString("CheeseType").equals("Cottage"))
    cheese.setCheeseType(CheeseType.Cottage);            
else if(srs.getString("CheeseType").equals("Cheddar"))
    cheese.setCheeseType(CheeseType.Cheddar);

---

有一个从数据库填充的地图：

CREATE TABLE `cheese_tbl` (
  `id` int(10) DEFAULT NULL,
  `description` varchar(100) DEFAULT NULL,
  `weight` float DEFAULT NULL,
  `price` float DEFAULT NULL,
  `mfg_date` date DEFAULT NULL,
  `UseBeforeInMonths` int(3) DEFAULT NULL,
  `cheeseType` varchar(20) DEFAULT NULL,
  `protein` float DEFAULT NULL,
  `vitaminB1` float DEFAULT NULL,
  `fat` float DEFAULT NULL
) 

INSERT INTO `cheese_tbl` VALUES 
(1001,'Mozzarella Cheese - Best for Pizza Preparation',200,200,'2014-01-09',12,'Mozzarella',30,0.57,0.33),
(1002,'Goat Cheese Low calories -Easy Spread',300,300,'2014-01-10',3,'Easy_Spread',0.33,33.99,0.57),
(1003,'Cottage Cheese High Protine and Energy',400,400,'2014-05-28',6,'Cottage',0.33,20.2,0.57);

到

更好的是

if(srs.getString("CheeseType").equals("Mozzarella"))
    cheese.setCheeseType(CheeseType.Mozzarella);             
else if(srs.getString("CheeseType").equals("Easy_Spread"))
    cheese.setCheeseType(CheeseType.Easy_Spread);
else if(srs.getString("CheeseType").equals("Cottage"))
    cheese.setCheeseType(CheeseType.Cottage);            
else if(srs.getString("CheeseType").equals("Cheddar"))
    cheese.setCheeseType(CheeseType.Cheddar);

Map<Ingred,Float> map = cheese.getCalorieTable();
map.put(Ingred.protein,srs.getFloat("protein"));
map.put(Ingred.vitamin,srs.getFloat("vitaminB1"));
map.put(Ingred.fat,srs.getFloat("fat"));

Map<Ingred,Float> map = new HashMap<Ingred,Float>();
map.put(Ingred.protein,srs.getFloat("protein"));
map.put(Ingred.vitamin,srs.getFloat("vitaminB1"));
map.put(Ingred.fat,srs.getFloat("fat"));
cheese.setCalorieTable(map);

if(srs.getString("CheeseType").equals("Mozzarella"))
    cheese.setCheeseType(CheeseType.Mozzarella);             
else if(srs.getString("CheeseType").equals("Easy_Spread"))
    cheese.setCheeseType(CheeseType.Mozzarella);
else if(srs.getString("CheeseType").equals("Cottage"))
    cheese.setCheeseType(CheeseType.Mozzarella);            
else if(srs.getString("CheeseType").equals("Cheddar"))
    cheese.setCheeseType(CheeseType.Mozzarella);

if(srs.getString("CheeseType").equals("Mozzarella"))
    cheese.setCheeseType(CheeseType.Mozzarella);             
else if(srs.getString("CheeseType").equals("Easy_Spread"))
    cheese.setCheeseType(CheeseType.Easy_Spread);
else if(srs.getString("CheeseType").equals("Cottage"))
    cheese.setCheeseType(CheeseType.Cottage);            
else if(srs.getString("CheeseType").equals("Cheddar"))
    cheese.setCheeseType(CheeseType.Cheddar);

cheese.setCheeseType(CheeseType.valueOf(srs.getString("CheeseType")));