利用SSM(springmvc+spring+mybatis)实现多表联合查询
最近在做在eclipse + maven搭建SSM框架下做一个简单的后台管理系统，因为是第一次搭建SSM项目，在mybatis进行多表连接查询的时候遇到问题，不知道如何进行处理？在网上搜了一下解决方法是，以实现，记录下自己的实现方案。
- 表之间的关系如下图所示：
环境搭建的是eclipse + maven+SpringMVC + Spring + MyBatis，前端用到的是bootstrap框架。
因为是第一次做SSM项目没有用到 mybatis 的自动生成工具 mybatis generator 生成的实体类、mapper 接口、以及 mapper xml 文件。都是自己写的。
Project 类
import java.util.List;
import org.apache.ibatis.type.Alias;
/**
* @author 作者:
* @date 创建时间：2018年10月19日
* @version 1.0
* @author
*/
@Alias("Project")
public class Project {
private String gid ;
private String activity ;
private String activity_end;
private String src ;
private String src2;
private String src3;
private String msgSuc;
private String msgSuc1;
private String jdr;
private String createtime;
private List lotterys;//这个是一个重点与Lottery实体类进行关联
public String getGid() {
return gid;
}
public void setGid(String gid) {
this.gid = gid;
}
public String getActivity() {
return activity;
}
public void setActivity(String activity) {
this.activity = activity;
}
public String getSrc() {
return src;
}
public void setSrc(String src) {
this.src = src;
}
public String getActivity_end() {
return activity_end;
}
public void setActivity_end(String activity_end) {
this.activity_end = activity_end;
}
public String getSrc2() {
return src2;
}
public void setSrc2(String src2) {
this.src2 = src2;
}
public String getSrc3() {
return src3;
}
public void setSrc3(String src3) {
this.src3 = src3;
}
public String getMsgSuc() {
return msgSuc;
}
public void setMsgSuc(String msgSuc) {
this.msgSuc = msgSuc;
}
public String getMsgSuc1() {
return msgSuc1;
}
public void setMsgSuc1(String msgSuc1) {
this.msgSuc1 = msgSuc1;
}
public String getJdr() {
return jdr;
}
public void setJdr(String jdr) {
this.jdr = jdr;
}
public String getCreatetime() {
return createtime;
}
public void setCreatetime(String createtime) {
this.createtime = createtime;
}
public List getLottery() {
return lotterys;
}
public void setLottery(List lotterys) {
this.lotterys = lotterys;
}
@Override
public String toString() {
return "Project [gid=" + gid + ", activity=" + activity + ", activity_end=" + activity_end + ", src=" + src
+ ", src2=" + src2 + ", src3=" + src3 + ", msgSuc=" + msgSuc + ", msgSuc1=" + msgSuc1 + ", jdr=" + jdr
+ ", createtime=" + createtime + "]";
}
public Project(String gid, String activity, String activity_end, String src, String src2, String src3,
String msgSuc, String msgSuc1, String jdr) {
super();
this.gid = gid;
this.activity = activity;
this.activity_end = activity_end;
this.src = src;
this.src2 = src2;
this.src3 = src3;
this.msgSuc = msgSuc;
this.msgSuc1 = msgSuc1;
this.jdr = jdr;
}
public Project() {
super();
}
}
Lottery类
import org.apache.ibatis.type.Alias;
/**
* @author 作者:
* @date 创建时间：2018年10月19日
* @version 1.0
* @author
*/
@Alias("Lottery")
public class Lottery {
private String id;
private String project_id;
private String url;
private String settingId;
private String title;
private String settingTitle;
private String days_newCust;
private String days_oldCust;
private String appid; //appid
private String appSecret;
private String awardType;
private String status;
private String mete;
private String mutex;
private String createtime;/
private String jdr;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getProject_id() {
return project_id;
}
public void setProject_id(String project_id) {
this.project_id = project_id;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getSettingId() {
return settingId;
}
public void setSettingId(String settingId) {
this.settingId = settingId;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getSettingTitle() {
return settingTitle;
}
public void setSettingTitle(String settingTitle) {
this.settingTitle = settingTitle;
}
public String getDays_newCust() {
return days_newCust;
}
public void setDays_newCust(String days_newCust) {
this.days_newCust = days_newCust;
}
public String getDays_oldCust() {
return days_oldCust;
}
public void setDays_oldCust(String days_oldCust) {
this.days_oldCust = days_oldCust;
}
public String getAppid() {
return appid;
}
public void setAppid(String appid) {
this.appid = appid;
}
public String getAppSecret() {
return appSecret;
}
public void setAppSecret(String appSecret) {
this.appSecret = appSecret;
}
public String getAwardType() {
return awardType;
}
public void setAwardType(String awardType) {
this.awardType = awardType;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public String getMete() {
return mete;
}
public void setMete(String mete) {
this.mete = mete;
}
public String getMutex() {
return mutex;
}
public void setMutex(String mutex) {
this.mutex = mutex;
}
public String getCreatetime() {
return createtime;
}
public void setCreatetime(String createtime) {
this.createtime = createtime;
}
public String getJdr() {
return jdr;
}
public void setJdr(String jdr) {
this.jdr = jdr;
}
public Lottery() {
super();
}
public Lottery(String id, String project_id, String url, String settingId, String title, String settingTitle,
String days_newCust, String days_oldCust, String appid, String appSecret, String awardType, String status,
String mete, String mutex, String jdr) {
super();
this.id = id;
this.project_id = project_id;
this.url = url;
this.settingId = settingId;
this.title = title;
this.settingTitle = settingTitle;
this.days_newCust = days_newCust;
this.days_oldCust = days_oldCust;
this.appid = appid;
this.appSecret = appSecret;
this.awardType = awardType;
this.status = status;
this.mete = mete;
this.mutex = mutex;
this.jdr = jdr;
}
}
project 与 lottery 是1:1的关系，在 project zhong 加入一个lottery属性，对应一对一的关系。
然后就是mapper接口与xml文件
mapper :ProjectDao
public interface ProjectDao {
//查询项目信息列表
List selectAllProject();
}
xml ProjectDao.xml
gid, activity, activity_end, src,src2,src3,msgSuc,msgSuc1,jdr,createtime
delete from system_project
where gid = #{gid}
service 层代码
public interface ProjectService {
List selectAllProject();
}
service impl
@Service("projectService")
public class ProjectServiceImpl implements ProjectService {
@Autowired
public ProjectDao projectDao;
@Override
public List selectAllProject() {
// TODO Auto-generated method stub
return this.projectDao.selectAllProject();
}
}
controler层往前端传的是json
@RequestMapping("/showProjectList")
@ResponseBody
public String GetDepartment()
{
List list = projectService.selectAllProject();
Gson gson = new Gson();
System.err.println("**********list*********"+gson.toJson(list));
System.err.println("**********list*********"+gson.toJson(list));
System.err.println("**********list*********"+gson.toJson(list));
return gson.toJson(list);
}
传的json是复杂的嵌套类型如下图：
前端用到的了bootstrap框架
对于嵌套的json boostrap有处理方法需要如下操作：
{
field: 'lotterys',
title: '类型',
formatter : function(value,row, index){ //主要配置在这里
return value[0].awardType; }
}
最后的实现效果如下：
bootstrap 参考地址：https://www.cnblogs.com/landeanfen/p/4976838.html
本文实现方法参考文章：https://blog.csdn.net/u012661010/article/details/76408566