解决springjpa的局部更新字段问题

public Result update(@RequestBody AppScene appScene, @PathVariable String id ){
 AppScene target = appSceneService.findById(id); //数据库查出待更新对象
 BeanUtils.copyProperties(appScene,target,getNullPropertyNames(appScene)); //使用更新对象的非空值去覆盖待更新对象
 appSceneService.update(target ); //执行更新操作
 return new Result(true,StatusCode.OK,"修改成功");
}

public static String[] getNullPropertyNames (Object source) {
 final BeanWrapper src = new BeanWrapperImpl(source);
 java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();
 Set<String> emptyNames = new HashSet<String>();
 for(java.beans.PropertyDescriptor pd : pds) {
 Object srcValue = src.getPropertyValue(pd.getName());
 if (srcValue == null) emptyNames.add(pd.getName());
 }
 String[] result = new String[emptyNames.size()];
 return emptyNames.toArray(result);
 }

import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
import java.util.HashSet;
import java.util.Set;
/**
 * jpa 部分字段更新方法
 */
public class UpdateColumnUtil {
 public static String[] getNullPropertyNames(Object source) {
  final BeanWrapper src = new BeanWrapperImpl(source);
  java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();
  Set<String> emptyNames = new HashSet<>();
  for (java.beans.PropertyDescriptor pd : pds) {
   Object srcValue = src.getPropertyValue(pd.getName());
   if (srcValue == null) emptyNames.add(pd.getName());
  }
  String[] result = new String[emptyNames.size()];
  return emptyNames.toArray(result);
 }
}

//首先从数据库查出待更新对象
Customer target = customerService.findById(customer.getCustId());
//使用更新对象的非空值去覆盖待更新对象
BeanUtils.copyProperties(customer, target, UpdateColumnUtil.getNullPropertyNames(customer));
//执行更新操作
save = customerService.save(target);