mybatis入门教程(七)----关联查询之一对多
init.sql:
use bbs; /*帖子表,存储帖子的信息*/ drop table if exists article; create table article( id int primary key auto_increment, title varchar(100), biboid int, smboid int, userid int, createtime datetime, updatetime datetime, context text, goodcount int, badcount int, reward int, score int, ispay bit, islocked bit )ENGINE=InnoDB DEFAULT CHARSET=utf8; /*用户表*/ drop table if exists user; create table user( id int primary key auto_increment, username varchar(50) unique, password varchar(100), nickname varchar(50), salt varchar(100), locked boolean )engine=InnqDB default charset=utf8; INSERT INTO `user` VALUES (1,'pwpw1218','pwpw1218','King-pan',NULL,1),(5,'pwpw121822','pwpw1218','King-Pan',NULL,1),(6,'pwpw121833','pwpw1218','King-Pan',NULL,1); INSERT INTO `article` VALUES (1,'bbs通知222',0,0,0,'2014-06-04 10:56:07','2014-06-04 11:11:06','文章 马伊琍 离婚吧',0,0,0,0,'\0','\0'),(2,'bbs通知222',0,0,0,'2014-06-04 11:10:41','2014-06-04 11:16:18','文章 马伊琍 离婚吧',0,0,0,0,'\0','\0'),(3,'bbs通知',0,0,1,'2014-06-06 15:48:51',NULL,'文章 马伊琍 离婚吧',0,0,0,0,'\0','\0'),(4,'bbs通知',0,0,1,'2014-06-06 15:48:56',NULL,'文章 马伊琍 离婚吧',0,0,0,0,'\0','\0'),(5,'bbs通知',0,0,1,'2014-06-06 15:49:00',NULL,'文章 马伊琍 离婚吧',0,0,0,0,'\0','\0'),(6,'bbs通知',0,0,1,'2014-06-06 15:49:04',NULL,'文章 马伊琍 离婚吧',0,0,0,0,'\0','\0'),(7,'bbs通知',0,0,1,'2014-06-06 15:49:07',NULL,'文章 马伊琍 离婚吧',0,0,0,0,'\0','\0'),(8,'bbs通知',0,0,1,'2014-06-06 15:49:12',NULL,'文章 马伊琍 离婚吧',0,0,0,0,'\0','\0');
User:
package com.mscncn.bbs.core.model;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
/**
* 用户表
* @author king-pan
*
*/
public class User implements Serializable {
private static final long serialVersionUID = 1L;
/**
* 用户id
*/
private Integer id;
/**
* 用户名
*/
private String userName;
/**
* 用户密码
*/
private String password;
/**
* 用户昵称
*/
private String nickName;
/**
* 加密密码的盐
*/
private String salt;
/**
* 账号是否锁住
*/
private List<Article> articles=new ArrayList<Article>();
private Boolean locked = Boolean.FALSE;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getNickName() {
return nickName;
}
public void setNickName(String nickName) {
this.nickName = nickName;
}
public String getSalt() {
return salt;
}
public void setSalt(String salt) {
this.salt = salt;
}
public Boolean getLocked() {
return locked;
}
public void setLocked(Boolean locked) {
this.locked = locked;
}
@Override
public String toString() {
return "User [id=" + id + ", userName=" + userName + ", password="
+ password + ", nickName=" + nickName + ", salt=" + salt
+ ", locked=" + locked + "]";
}
public List<Article> getArticles() {
return articles;
}
public void setArticles(List<Article> articles) {
this.articles = articles;
}
}
Article:
package com.mscncn.bbs.core.model;
import java.io.Serializable;
import java.util.Date;
/**
* 帖子,文章
* @author king-pan
*
*/
public class Article implements Serializable {
private static final long serialVersionUID = 1L;
/**
* 文章的id
*/
private int id;
/**
* 文章的标题
*/
private String title;
/**
* 文章的内容
*/
private String context;
/**
* BiBoid 帖子所属父版块id int
*/
private int biboId;
/**
* SmBoid 帖子所属子版块id int
*/
private int smboId;
/**
* admin 发帖者姓名 nvarchar
*/
private int userId;
/**
* createtime 发帖时间 datetime
*/
private Date createTime;
/**
* updatetime 更新时间 datetime
*/
private Date updateTime;
/**
* goodcount 帖子的好评数 int
*/
private int goodCount;
/**
* badcount 帖子的坏评数 int
*/
private int badCount;
/**
* reward 帖子的总共悬赏分（吸引浏览） int
*/
private int reward;
/**
* score 帖子悬赏分所剩下的分数 int
*/
private int score;
/**
* ispay 是否结贴 bit
*/
private boolean isPay;
/**
* islocked 是否帖子被锁定 bit
*/
private boolean isLocked;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContext() {
return context;
}
public void setContext(String context) {
this.context = context;
}
public int getBiboId() {
return biboId;
}
public void setBiboId(int biboId) {
this.biboId = biboId;
}
public int getSmboId() {
return smboId;
}
public void setSmboId(int smboId) {
this.smboId = smboId;
}
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public Date getUpdateTime() {
return updateTime;
}
public void setUpdateTime(Date updateTime) {
this.updateTime = updateTime;
}
public int getGoodCount() {
return goodCount;
}
public void setGoodCount(int goodCount) {
this.goodCount = goodCount;
}
public int getBadCount() {
return badCount;
}
public void setBadCount(int badCount) {
this.badCount = badCount;
}
public int getReward() {
return reward;
}
public void setReward(int reward) {
this.reward = reward;
}
public int getScore() {
return score;
}
public void setScore(int score) {
this.score = score;
}
public boolean isPay() {
return isPay;
}
public void setPay(boolean isPay) {
this.isPay = isPay;
}
public boolean isLocked() {
return isLocked;
}
public void setLocked(boolean isLocked) {
this.isLocked = isLocked;
}
@Override
public String toString() {
return "Article [id=" + id + ", title=" + title + ", content="
+ context + ", biboId=" + biboId + ", smboId=" + smboId
+ ", userId=" + userId + ", createTime=" + createTime
+ ", updateTime=" + updateTime + ", goodCount=" + goodCount
+ ", badCount=" + badCount + ", reward=" + reward + ", score="
+ score + ", isPay=" + isPay + ", isLocked=" + isLocked + "]";
}
}
UserMapper.java:
public interface UserMapper {
void add(User user);
void delete(@Param(value="id") Integer id);
void update(User user);
User queryUser(Map<String,Object> params);
User queryArticleByUser(@Param(value="id")Integer id);
}
UserMapper.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- 这里namespace必须是PostsMapper接口的路径，不然要运行的时候要报错 “is not known to the MapperRegistry”-->
<mapper namespace="com.mscncn.bbs.mybatis.mapper.UserMapper">
<select id="queryUser" parameterType="java.util.Map" resultType="User">
select * from user
<where>
<if test="userName!=null">
and userName=#{userName}
</if>
<if test="1==1">
and 1=1
</if>
</where>
</select>
<insert id="add" parameterType="User">
insert into user (username,password,nickname,salt,locked) values
(#{userName},#{password},#{nickName},#{salt},#{locked})
</insert>
<update id="update" parameterType="User">
update user
<set>
<if test="password!=null">
password=#{password},
</if>
<if test="nickName!=null">
nickname=#{nickName},
</if>
</set>
where id=#{id}
</update>
<delete id="delete" parameterType="int">
delete from user <choose>
<when test="id!=0">
where id=#{id}
</when>
<otherwise>
where 1=2
</otherwise>
</choose>
</delete>
<select id="queryArticleByUser" parameterType="int" resultMap="UserResultMap">
select u.id u_id, u.username,u.password,u.salt,a.id a_id,a.userid,a.title,a.context from user u join article a on(u.id=a.userid) and u.id=#{id}
</select>
<!--
private String userName;
private String password;
private String nickName;
private String salt;
-->
<resultMap type="User" id="UserResultMap">
<id column="u_id" javaType="int" property="id" />
<result property="userName" column="username" javaType="String" />
<result property="password" column="password" javaType="String"/>
<result property="nickName" column="nickname" javaType="String"/>
<result property="salt" column="salt" javaType="String"/>
<collection property="articles" ofType="Article">
<id property="id" column="a_id" />
<result property="title" column="title" javaType="String" />
<result property="context" column="context" javaType="String"/>
</collection>
</resultMap>
</mapper>