nhmicro框架中dao层操作为了保证灵活性和可扩展性,输入输出均为map,但开发人员比较熟悉使用bean作为dao层输入输出。使用micro-orm.jar中的MicroBeanMapUtil和MicroMappingAnno实现map与bean相互映射。维持灵活性的同时,也向开发人员编程习惯靠拢,并间接实现了编译时字段约束和检查。
Bean中使用@MicroMappingAnno说明map对应的key
public class TestBean {
@MicroMappingAnno(name="user_id")
private Integer userId;
@MicroMappingAnno(name="user_name")
private String userName;
@MicroMappingAnno(name="user_age")
private Integer userAge;
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public Integer getUserAge() {
return userAge;
}
public void setUserAge(Integer userAge) {
this.userAge = userAge;
}
}
代码中使用MicroBeanMapUtil.beanToMap将bean转为map,使用MicroBeanMapUtil.mapToBean将map转为bean,注意map中的值均为string类型。
public static void main(String[] args) throws Exception {
TestBean testBean=new TestBean();
testBean.setUserAge(20);
testBean.setUserId(123);
testBean.setUserName("tom");
Map beanMap=MicroBeanMapUtil.beanToMap(testBean);
System.out.println("bean to map="+beanMap);
Map paramMap=new HashMap();
paramMap.put("user_id", "678");
paramMap.put("user_name", "jerry");
paramMap.put("user_age", "33");
TestBean mapBean=(TestBean) MicroBeanMapUtil.mapToBean(paramMap, TestBean.class);
System.out.println("map to bean="+mapBean);
}