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我就废话不多说了，大众还是直接看代码吧 //执行的是删除信息的操作
String a=request.getParameter("name");
a = URLEncoder.encode(a, "ISO-8859-1");
String name = URLDecoder.decode(a, "UTF-8");
String num=request.getParameter("num");
System.out.println("name:"+name+"num:"+num);
String sql="delete from person_info where name=? and num=?";String sz[]={name,num};
JdbcUtils.update(sql, sz);
//刷新操作\
String sqls="select * from person_info";
ResultSet rs=JdbcUtils.select(sqls, null);
ArrayList< erson_info> list=new ArrayList<erson_info>();
try {
while(rs.next()){
Person_info pi=new Person_info(rs.getString(1), rs.getString(2), rs.getString(3), rs.getString(4), rs.getString(5), rs.getString(6));
list.add(pi);
}
request.setAttribute("list", list);
request.getRequestDispatcher("Personnel_definition.jsp").forward(request, response);
} catch (SQLException e) {
// TODO Auto-generated catch blocke.printStackTrace();
}
}
image.png
弥补知识：关于分页时怎么实现当本页面最后一条记录被删除时,自动向上一个页面转的实现（java实现）
问题详解
在做批量删除时，发掘若批量删除整页时，会自动跳到第1页首页，而不是返回删除当前页的上一页，不符合制品需求且使界面交互欠好，给用户带来糟糕体验。
思路详解
在controller层传参时要思虑到不仅要传入必须删除的id集合，同期传入pageSize,pageNum以及总条数集合的查找要求（如：本示例会传入groupId(分组id)）,在删除成功后初始化当前页，先按照查找要求查找出总条数数量，在pageSize不等于null或为0的状况下。算出余数[（pageSize*pageNum-count）%pageSize ].若余数为0，则当前页等于pageNum-1;若余数不为0，则当前页=pageNum.将结果当前页传给前台就可。
后台代码实现
controller层#@Api(description = "分组下的学生",value = "分组下的学生")
@RestController
@RequestMapping("studentGroup")
public class StudentGroupController {
@Autowiredprivate RestStudentGroupService restStudentGroupService;@RequestMapping(value = "deleteGroupStudent",method = RequestMethod.POST)
@ApiOperation(value = "删除分组中的学生",notes = "删除分组中的学生")
public Responseobj deleteGroupStudent(@RequestParam(value = "groupId",required = true)Long groupId,
@RequestParam(value = "ids",required = true)String ids,
@RequestParam(value ="pageSize",required = false)Integer pagesize,
@RequestParam(value = "pageNum",required = false)Integer pageNum){
return restStudentGroupService.deleteGroupStudent(groupId,ids,pagesize,pageNum);
}
}
service层#@FeignClient(value = ServiceName.VALUE)
public interface RestStudentGroupService {@RequestMapping(value = "/school/cloud/student/deleteGroupStudent",method = RequestMethod.POST)
public ResponseObj deleteGroupStudent(@RequestParam(value = "groupId")Long groupId,
@RequestParam(value = "ids")String ids,
@RequestParam(value = "pageSize")Integer pagesize,
@RequestParam(value = "pageNum")Integer pageNum);
}serviceImpl层#@Service
public class RestStudentGroupServiceImpl implements RestStudentGroupService {
@Autowired
privateDubboStudentGroupService dubboStudentGroupService ;@Override
public ResponseObj deleteGroupStudent(Long groupId,String ids,Integer pageSize,Integer pageNum) {
List<Long> idList = TextUtils.split(ids);
if(groupId == null || idList== null || idList.size() == 0){
ResponseObj responseObj = ResponseObj.ERROR("参数错误");
responseObj.setSuccess(true);
return responseObj;
}
ServiceResult<Long> serviceResult = dubboStudentGroupService .deleteCorpGroup(idList, groupId);if(!serviceResult.getSuccess()){
throw new RuntimeException("分组下学生查找失败");
}
//应前端需求加此dto，封装传给前台的当前页属性CurrenPageDto currenPageDto=new CurrenPageDto();//初始化当前页
Integer currentPage = 1;
//查出该分组id下的学生数量
ServiceResult<Long> itemCountLongs = dubboStudentGroupService.getTotalCount(groupId);
LongitemCountLong= itemCountLongs.getResult();
Integer itemCount = itemCountLong!=null ? itemCountLong.intValue() : 0;
//"查找到学生数量：{},pageSize:{}", itemCount,pageSize;
if(pageSize != null && pageSize != 0){
//算出余数
Integer temp = (pageNum*pageSize-itemCount)%pageSize;
if(temp == 0){
//余数为0的话就pageNum-1currentPage = (pageNum -1) == 0 ? 1 : (pageNum -1) ;
}else {
//余数不为0则等于pageNumcurrentPage = pageNum;
}
currenPageDto.setPresentPage(currentPage);
}
ResponseObj responseObj = ResponseObj.SUCCESS();
responseObj.setData(currenPageDto);return responseObj;
}
}
dubbo接口的service层#①：//删除分组下的学生ServiceResult<Long> deleteCorpGroup(List<Long> idList,Long groupId);
②：//按照要求查找对应的条目总数
ServiceResult<Long> getTotalCount(Long groupId);
dubbo接口的serviceImpl层#`①：``//删除分组下的学生`
`@Override`
`public` `ServiceResult<Long> deleteCorpGroup(List<Long> idList, Long groupId) {`
`ServiceResult<Long> result =` `new` `ServiceResult<>();`
`try` `{`
`studentGroupDao.deleteCorpGroup(idList, groupId);`
`}` `catch` `(Exception e) {`
`log.error(``"调用{}办法 反常"``,` `"[RestStudentGroupServiceImpl .deleteCorpGroup]"``);`
`log.error(``"办法运用参数：[idList:{},groupId:{}]"``, idList, groupId);`
`log.error(``"反常信息：{}"``, e);`
`result.setErrMessage(``"调用deleteCorpGroup办法反常，反常信息："` `+ e.getMessage());`
`}`
`return` `result;`
`}`
`②：``//按照要求查找对应的条目总数`
`@Override`
`public` `ServiceResult<Long> getTotalCount(Long groupId) {`
`ServiceResult<Long> result =` `new` `ServiceResult<>();`
`try` `{`
`long` `count = studentGroupDao.getFindCorpGroupDirectoryCount(groupId);`
`result.setResult(count);`
`}` `catch` `(Exception e) {`
`log.error(``"调用{}办法 反常"``,` `"[RestStudentGroupServiceImpl .getTotalCount]"``);`
`log.error(``"办法运用参数：[groupId:{}]"``, groupId);`
`log.error(``"反常信息：{}"``, e);`
`result.setErrMessage(``"调用getTotalCount办法反常，反常信息："` `+ e.getMessage());`
`}`
`return` `result;`
`}`|
[](javascript:; "全选")[](javascript:; "复制java代码")
<textarea style="margin: 0px; padding: 0px; outline: none; font: 16px / 24px tahoma, arial, 宋体;"></textarea>
#dubbo接口的dao层#
`①：``//删除分组下的学生`
`Long deleteCorpGroup(``@Param``(value =` `"idList"``) List<Long> idList,``@Param``(value =` `"groupId"``) Long groupId);`
`②：``//按照要求查找对应的条目总数`
`Long getFindCorpGroupDirectoryCount(``@Param``(value =` `"groupId"``) Long groupId);`
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dubbo接口的sql#①：//删除分组下的学生<delete id="deleteCorpGroup">
delete from student_group where group_id = #{groupId} and id in
<foreach collection="idList" index="index" separator="," item="id"open="(" close=")">
#{id}
</foreach>
</delete>
②：//按照要求查找对应的条目总数
<select id="getFindCorpGroupDirectoryCount" resultType="long">
SELECT COUNT(1)
FROM student_groupwhere group_id = #{groupId}
</select>
Entity类(学生分组类)#（get,set函数省略）
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publicclassStudentGroupimplementsjava.io.Serializable {
/**
*
*/
privatestaticfinallongserialVersionUID = 1L;
/**
* @描述:
* @字段:id BIGINT(19)
*/
privateLong StudentGroupId;
/**
* @描述:
* @字段:group_id BIGINT(19)
*/
privateLong groupId;
/**
* @描述:
* @字段:id BIGINT(19)
* 此id为学生表id
*/
privateLong id;
/**
* @描述:创建时间
* @字段:create_time DATETIME(19)
*/
privatejava.util.Date createTime;
* @描述:创建人用户名
* @字段:create_user_name VARCHAR(``30``)
*/
privateString createUserName;
/**
* @描述:创建人用户ID
* @字段:create_user_id BIGINT(19)
*/
privateLong createUserId;
/**
* @描述:更新时间
* @字段:update_time DATETIME(19)
*/
privatejava.util.Date updateTime;
* @描述:更新人用户名
* @字段:update_user_name VARCHAR(``30``)
*/
privateString updateUserName;
/**
* @描述:更新人用户ID
* @字段:update_user_id BIGINT(19)
*/
privateLong updateUserId;
}
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[](javascript:; "全选")[](javascript:; "复制java代码")
<textarea style="margin: 0px; padding: 0px; outline: none; font: 16px / 24px tahoma, arial, 宋体;"></textarea> #Entity类(学生类)#（get,set函数省略）
```c
`public` `clas` `Student` `implements` `java.io.Serializable {`
`/**`
`*`
`*/`
`private` `static` `final` `long` `serialVersionUID = 1L;`
`private` `Long id;`
`private` `String name ;`
`private` `Integer age;`
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发表于 2024-8-17 10:06:17
