mybatis project 分步查询提交

mybatis_train/src/main/java/com/mapper/AccountMapper.java

@@ -16,6 +16,7 @@ public interface AccountMapper {
     AccountRealEntity findByResultMap();
     // 多对一查询
     AccountVO findVO(Integer id);
+    AccountVO findByStep(Integer id);
 
 
 }

mybatis_train/src/main/java/com/mapper/DepartmentMapper.java

@@ -1,10 +1,11 @@
 package com.mapper;
 
 import com.pojo.dto.DepartmentVO;
+import com.pojo.entity.DepartmentEntity;
 
 public interface DepartmentMapper {
 
     // 一对多查询
     DepartmentVO oneFindMore(Integer id);
-
+    DepartmentEntity findById(Integer depId);
 }

mybatis_train/src/main/resources/com/mapper/AccountMapper.xml

@@ -18,7 +18,18 @@
             <result property="depName" column="dep_name"></result>
         </association>
     </resultMap>
-
+    <resultMap id="finByStepMap" type="com.pojo.dto.AccountVO">
+        <id property="id" column="id"></id>
+        <result property="userName" column="user_name"></result>
+        <result property="balance" column="balance"></result>
+        <result property="depId" column="dep_id"></result>
+        <association property="departmentEntity"
+            select="com.mapper.DepartmentMapper.findById"
+                     column="dep_id"
+        ></association>
+    </resultMap>
+    
+    
     <select id="findAll" resultType="account"
             parameterType="java.lang.Integer"
     >
@@ -37,5 +48,8 @@
         select a.*,b.dep_name from account a left join department b on a.dep_id = b.dep_id
         where a.id = #{id}
     </select>
-
+<!--    分步查询 1-->
+    <select id="findByStep" parameterType="java.lang.Integer" resultMap="finByStepMap">
+        select * from account where id= #{id}
+    </select>
 </mapper>

mybatis_train/src/main/resources/com/mapper/DepartmentMapper.xml

@@ -12,8 +12,11 @@
             <result property="balance" column="balance"></result>
             <result property="depId" column="dep_id"></result>
         </collection>
-
     </resultMap>
+
+    <select id="findById" parameterType="java.lang.Integer" resultType="com.pojo.entity.DepartmentEntity">
+        select * from department where dep_id = #{depId}
+    </select>
     <select id="oneFindMore" parameterType="java.lang.Integer" resultMap="oneMore">
         select a.*,b.* from department a left join account b on a.dep_id = b.dep_id
         where a.dep_id = #{id1}

mybatis_train/src/test/java/Test3.java

@@ -32,6 +32,7 @@ public class Test3 {
         sqlSession = build.openSession(true);
         sqlSession2 = build.openSession(true);
         userMapper = sqlSession.getMapper(UserMapper.class);
+        accountMapper = sqlSession.getMapper(AccountMapper.class);
     }
     @Test
     public void testCondition()  {
@@ -78,6 +79,11 @@ public class Test3 {
         AccountVO vo = accountMapper.findVO(16);
 
     }
+    @Test
+    public void testFindStep() {
+        AccountVO byStep = accountMapper.findByStep(16);
+    }
+
 
     @Test
     public void delete() {