代码如下：
//代码示例：例如保存时，传入下面两个字段
String filed;
String content;
//User代表要更新的实体，user即本对象
//filed代表要更改的字段，例如user.name
//content代表要更改字段的值，例如“张三”
import org.springframework.beans.BeanUtils;
User user = new User(); //反射赋值 //反射 + javaBean机制 get set 方法 Class<? extends User> clz = user.getClass(); PropertyDescriptor propertyDescriptor = BeanUtils.getPropertyDescriptor(clz, filed); //获取当前字段的javabean写方法 Method writeMethod = propertyDescriptor.getWriteMethod(); if (writeMethod != null) { try { writeMethod.invoke(user, "张三"); } catch (Exception e) { syatem.out.println(e); } }
JPA保存即保存对象即可，因为对象的值已经存入user对象。
User newUser = goodsMsgService.insert(oldGoodsMsg);
mybatis保存对象：
@Update("update goods_msg set ${filed} = #{context} where uid = #{uid}")
public int saveFiled(@Param("filed")String filed, @Param("uid")String uid, @Param("context")String context);
如下，有一个完整的代码示例可以参考：
//将实体字段存入List public static final List<String> AUTH_FILEDS = Arrays.asList(new String[]{ "innerFrist", "innerNormal", "innerDanger", "outFrist", "outNormal", "outDanger", "notAct", "share", "notSub", "exceedMaxQueryTime", "scanCodeLimit", "innerSafetyTime", "outerSafetyTime", "scanCodeLimitTime" }); //将实体属性 对应数据库字段存入 map 方便下面mybatis更新单个字段调用 public static final Map<String,String> AUTH_FILEDS_MAPPING = new HashMap<>(); static{ AUTH_FILEDS_MAPPING.put("innerFrist","inner_frist"); AUTH_FILEDS_MAPPING.put("innerNormal", "inner_normal"); AUTH_FILEDS_MAPPING.put("innerDanger", "inner_danger"); AUTH_FILEDS_MAPPING.put("outFrist", "out_frist"); AUTH_FILEDS_MAPPING.put("outNormal", "out_normal"); AUTH_FILEDS_MAPPING.put("outDanger", "out_danger"); AUTH_FILEDS_MAPPING.put("notAct", "not_act"); AUTH_FILEDS_MAPPING.put("share", "share"); AUTH_FILEDS_MAPPING.put("notSub","not_sub"); AUTH_FILEDS_MAPPING.put("exceedMaxQueryTime", "exceed_max_query_time"); AUTH_FILEDS_MAPPING.put("scanCodeLimit","scan_code_limit"); AUTH_FILEDS_MAPPING.put("innerSafetyTime","inner_safety_time"); AUTH_FILEDS_MAPPING.put("outerSafetyTime","outer_safety_time"); AUTH_FILEDS_MAPPING.put("scanCodeLimitTime","scan_code_limit_time"); } /** * 保存或修改(针对单一字段) * * ===========================非空字段=========================== * [ * 要修改的字段 : filed * 字段内容 : context * 是否全局 : global (1全局 0不是全局) * 绑定的商品或分类 : guid(全局为空) * ] * ===========================保存逻辑=========================== * 1 检查要修改的字段是否存在 * 2 判断操作话述是否属于当前租户 * 3 判断是否是全局,不是全局guid做非空验证 * 4 如果已经存在记录则修改 如果不存在新增 * * ===========================安全验证=========================== * guid是否属于当前租户 * * */ @Override public AjaxResult<String> saveFiled(@RequestBody SaveFiledRequestBean requestBean) { //当前租户 TenementUser tenementUser = RequestData.TENEMENT_USER.get(); //非空 LunaResultBean.checkField(requestBean,"filed","context","global","name"); // 不是全局的非空 if (1 != requestBean.getGlobal()) { LunaResultBean.checkField(requestBean,"guid"); } String filed = requestBean.getFiled(); String guid = requestBean.getGuid(); String context = requestBean.getContext(); AjaxResult<String> res = new AjaxResult<String>(); boolean isAdd = true; boolean success = true; GoodsMsg oldGoodsMsg = null; if(AUTH_FILEDS.contains(filed)){ if (StringUtils.isNotBlank(guid)) { boolean check = goodsConfigUtils.check(GoodsConfigUtils.CHECK_GUID, guid); if (check) { // 是否需要新增 oldGoodsMsg = goodsMsgService.findByGuid(guid); if (oldGoodsMsg != null) { isAdd = false; } } else { success = false; } } else { // 判断全局是否已经存在 oldGoodsMsg = goodsMsgService.findByGlobalMsg(tenementUser.getTenementId()); if (oldGoodsMsg != null) { isAdd = false; } } //判断参数验证是否通过 if (success) { if (isAdd) { // 添加 oldGoodsMsg = new GoodsMsg(); oldGoodsMsg.initInsertData(); oldGoodsMsg.setUid(UUID.randomUUID().toString().replaceAll("-", "")); oldGoodsMsg.setGuid(guid); oldGoodsMsg.setGlobal(requestBean.getGlobal()); //反射赋值 //反射 + javaBean机制 get set 方法 Class<? extends GoodsMsg> clz = oldGoodsMsg.getClass(); PropertyDescriptor propertyDescriptor = BeanUtils.getPropertyDescriptor(clz, filed); //获取当前字段的javabean写方法 Method writeMethod = propertyDescriptor.getWriteMethod(); if (writeMethod != null) { try { writeMethod.invoke(oldGoodsMsg, requestBean.getContext()); } catch (Exception e) { throw new LunaException("方法 "+ writeMethod.getName() +"无法执行",AjaxResult.ERROR_SYS_EXCPTION); } } //新增 GoodsMsg insert = goodsMsgService.insert(oldGoodsMsg); if (insert != null) { res.initTrue("操作成功"); } else { res.initFalse("操作失败", LunaResultBean.ERROR_BUSINESS); } } else { //修改 //调用mybatis update 字段 by uid int saveFiled = goodsMsgService.saveFiled(AUTH_FILEDS_MAPPING.get(filed), oldGoodsMsg.getUid(), context); if(saveFiled > 0){ res.initTrue("操作成功"); } else { res.initFalse("操作失败", LunaResultBean.ERROR_BUSINESS); } } } else { res.initFalse("请选择正确的商品或商品类型", LunaResultBean.ERROR_BUSINESS); } }else{ res.initFalse("无效字段 ["+ filed +"]", LunaResultBean.ERROR_BUSINESS); } return res; }