mybatis完成user与tag多对多映射

suvvm · Nov 21, 2019 · ff18956 · ff18956
1 parent bc9b259
commit ff18956
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Showing 4 changed files with 83 additions and 1 deletion.
diff --git a/OnlineSurveyBackEnd/src/main/java/qdu/suvvm/onlinesurvey/mapper/TagMapper.java b/OnlineSurveyBackEnd/src/main/java/qdu/suvvm/onlinesurvey/mapper/TagMapper.java
@@ -3,6 +3,7 @@
 import org.apache.ibatis.annotations.*;
 import org.apache.ibatis.jdbc.SQL;
 import qdu.suvvm.onlinesurvey.pojo.Tag;
+import qdu.suvvm.onlinesurvey.pojo.User;
 
 import java.util.List;
 
@@ -15,7 +16,16 @@
 public interface TagMapper {
     // 根据动态sql查询tag
     @SelectProvider(type = TagMapperProvider.class, method = "findTag")
+    @Results({
+            @Result(property = "id", column = "id", id = true),
+            @Result(property = "users", column = "id", many = @Many(select = "qdu.suvvm.onlinesurvey.mapper.UserMapper.getUserByTagId"))
+    })
     public List<Tag> selectTags(Tag tag);
+
+    // 根据tag id查询用户
+    @Select("select * from tags t inner join usertag ut on t.id=ut.tid where ut.uid=#{uid}")
+    public Tag getTagByUserId(Integer uid);
+
     // 根据id删除tag
     @Delete("delete from tags where id = #{id}")
     public int deleteTagById(Integer id);

diff --git a/OnlineSurveyBackEnd/src/main/java/qdu/suvvm/onlinesurvey/mapper/UserMapper.java b/OnlineSurveyBackEnd/src/main/java/qdu/suvvm/onlinesurvey/mapper/UserMapper.java
@@ -17,7 +17,16 @@
 public interface UserMapper {
     // 根据动态sql查询user
     @SelectProvider(type = UserMapperProvider.class, method="findUser")
+    @Results({
+            @Result(property = "id", column = "id", id = true),
+            @Result(property = "tags", column = "id", many = @Many(select = "qdu.suvvm.onlinesurvey.mapper.TagMapper.getTagByUserId"))
+    })
     public List<User> getUser(User user);
+
+    // 根据tag id查询用户
+    @Select("select * from users u inner join usertag ut on u.id=ut.uid where ut.tid=#{tid}")
+    public User getUserByTagId(Integer tid);
+
     // 根据id删除user
     @Delete("delete from users where id=#{id}")
     public int deleteUserById(Integer id);
@@ -41,6 +50,21 @@ class UserMapperProvider {
          * @Parameter:
          *  user 查询数据封装的用户类
          * @Return: 返回对应的sql语句
+         */
+        /*
+            select
+                *
+            from
+                user b
+            　　inner join
+               　　 tags m
+            　　on
+               　　 b.bid=m.m_bid
+            　　inner join
+               　　 category c
+            　　on
+            　　    m.m_cid=c.cid
+
          */
         public String findUser(User user) {
             return new SQL() {

diff --git a/OnlineSurveyBackEnd/src/main/java/qdu/suvvm/onlinesurvey/pojo/Tag.java b/OnlineSurveyBackEnd/src/main/java/qdu/suvvm/onlinesurvey/pojo/Tag.java
@@ -1,5 +1,7 @@
 package qdu.suvvm.onlinesurvey.pojo;
 
+import java.util.List;
+
 /**
  * @Author: SUVVM
  * @Date: 2019/11/12 16:58
@@ -8,7 +10,7 @@ public class Tag {
     private Integer id;
     private String name;
     private String description;
-
+    private List<User> users;
     public Integer getId() {
         return id;
     }
@@ -32,4 +34,22 @@ public String getDescription() {
     public void setDescription(String description) {
         this.description = description;
     }
+
+    public List<User> getUsers() {
+        return users;
+    }
+
+    public void setUsers(List<User> users) {
+        this.users = users;
+    }
+
+    @Override
+    public String toString() {
+        return "Tag{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", description='" + description + '\'' +
+                ", users=" + users +
+                '}';
+    }
 }
diff --git a/OnlineSurveyBackEnd/src/main/java/qdu/suvvm/onlinesurvey/pojo/User.java b/OnlineSurveyBackEnd/src/main/java/qdu/suvvm/onlinesurvey/pojo/User.java
@@ -1,5 +1,7 @@
 package qdu.suvvm.onlinesurvey.pojo;
 
+import java.util.List;
+
 /**
  * @Author: SUVVM
  * @Date: 2019/11/12 16:43
@@ -15,6 +17,7 @@ public class User {
     private String avatar;
     private String imgbase64;
     private Integer power;
+    private List<Tag> tags;
 
     public Integer getId() {
         return id;
@@ -95,4 +98,29 @@ public Integer getPower() {
     public void setPower(Integer power) {
         this.power = power;
     }
+
+    public List<Tag> getTags() {
+        return tags;
+    }
+
+    public void setTags(List<Tag> tags) {
+        this.tags = tags;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" +
+                "id=" + id +
+                ", username='" + username + '\'' +
+                ", password='" + password + '\'' +
+                ", name='" + name + '\'' +
+                ", pnum='" + pnum + '\'' +
+                ", email='" + email + '\'' +
+                ", gender='" + gender + '\'' +
+                ", avatar='" + avatar + '\'' +
+                ", imgbase64='" + imgbase64 + '\'' +
+                ", power=" + power +
+                ", tags=" + tags +
+                '}';
+    }
 }