mybatis实现批量修改-xml方式
目录
- mybatis批量修改-xml
- mybatis xml批量更新值
mybatis批量修改-xml
mybatis批量查询,批量新增就不聊了,今天看看批量修改。
直接上代码吧
xml文件中代码如下:
<update id="batchUpdate" parameterType="java.util.List"> update pat_doc_pat_info set sex= <foreach collection="list" item="item" index="index" separator=" " open="case patient_id" close="end"> when #{item.patientId} then #{item.sex} </foreach> ,address= <foreach collection="list" item="item" index="index" separator=" " open="case patient_id" close="end"> when #{item.patientId} then #{item.address} </foreach> ,birth_time= <foreach collection="list" item="item" index="index" separator=" " open="case patient_id" close="end"> when #{item.patientId} then #{item.birthTime} </foreach> ,remark= <foreach collection="list" item="item" index="index" separator=" " open="case patient_id" close="end"> when #{item.patientId} then #{item.remark} </foreach> ,modified_time = now() ,belong_hospital = 1 where delete_flag = 1 and doctor_id = <foreach collection="list" item="item" index="index" separator=" " open="case patient_id" close="end"> when #{item.patientId} then #{item.doctor_id} </foreach> and patient_id in <foreach collection="list" index="index" item="item" separator="," open="(" close=")"> #{item.patientId} </foreach> </update>
mapper类中代码如下:
int batchUpdate(List<PICAPPatientModel> list);
测试类方法如下:
@Autowired private PatDocPatInfoMapper patDocPatInfoMapper; @Test public void testMapperMethod () { List<PICAPPatientModel> updateMappingList = new ArrayList<>(); PICAPPatientModel model1 = new PICAPPatientModel(); model1.setPatientId(12334); model1.setDoctor_id(5466927); model1.setSex(2); model1.setAddress("上海市普陀区xxxx"); model1.setBirthTime(new Date()); model1.setRemark("哈哈哈哈"); PICAPPatientModel model2 = new PICAPPatientModel(); model2.setPatientId(5923302); model2.setDoctor_id(5466927); model2.setSex(1); model2.setAddress("上海市普陀区xxxx金沙江路1008号"); model2.setBirthTime(new Date()); model2.setRemark("哈哈哈哈adsfsa"); updateMappingList.add(model1); updateMappingList.add(model2); patDocPatInfoMapper.batchUpdate(updateMappingList); }
mybatis xml批量更新值
在表中已经存好了名字,但是想在这些个名字后面再加上想要的内容,例如表中有一个叫钱塘江的,我要改成钱塘江水系,而且都这样改,都要加上水系两个字,这个好办,用Java来实现的话就是先查询出所有的内容存入 list 中,然后遍历这个list放入对象中,用Set实体类的方式拼接,然后Update
public Result uuu(){ List<MdWaterSystem> list = mdWaterSystemService.findAll(); for (MdWaterSystem mdWaterSystem : list) { mdWaterSystem.setWaterName(mdWaterSystem.getWaterName()+"水系"); mdWaterSystemService.updates(mdWaterSystem); } return ResponseMsgUtil.success(list); }
虽然这样也能够实现,但是大可不必用代码,直接在SQL中写
update md_water_system set water_name = CONCAT(IFNULL(water_name,''), IFNULL('水系',''));
用CONCAT这个函数将现有的内容中后面加上自己想加入的即可
若又不想要了,可以用SQL来替换
update md_water_system set water_name = REPLACE(water_name, '水系', '')
REPLACE这个函数是替换函数,将要替换掉的字段内容写进去即可
以上为个人经验,希望能给大家一个参考,也希望大家多多支持我们。
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