mybatis中association和collection的column传入多个参数问题

阳光穿透心脏的1/2处 2022-02-24 01:48 280阅读 0赞

## mybatis中association和collection的column传入多个参数值 ##

项目中在使用association和collection实现一对一和一对多关系时需要对关系中结果集进行筛选，如果使用懒加载模式，即联合使用`select`标签时，主sql和关系映射里的sql是分开的，查询参数传递成为问题。

**mybatis文档:**

<table> 
 <thead> 
  <tr> 
   <th>property</th> 
   <th>description</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>column</td> 
   <td>数据库的列名或者列标签别名。与传递给resultSet.getString(columnName)的参数名称相同。注意： 在处理组合键时，您可以使用column=“{prop1=col1,prop2=col2}”这样的语法，设置多个列名传入到嵌套查询语句。这就会把prop1和prop2设置到目标嵌套选择语句的参数对象中。</td> 
  </tr> 
 </tbody> 
</table>

<resultMap id="findCountryCityAddressMap" type="map">
        <result property="country" column="country"/>
        <collection property="cityList"
                    column="{cityId=city_id,adr=addressCol, dis=districtCol}" //adr作为第二个sql查询条件key,即prop1属性
                    ofType="map"                                              //addressCol即为虚拟列名
                    javaType="java.util.List" select="selectAddressByCityId"/>
    </resultMap>
    
    <resultMap id="selectAddressByCityIdMap" type="map">
        <result property="city" column="city"/>
        <collection property="addressList" column="city" ofType="map" javaType="java.util.List">
            <result property="address" column="address"/>
            <result property="district" column="district"/>
        </collection>
    </resultMap>
    
    <select id="findCountryCityAddress" resultMap="findCountryCityAddressMap">
        SELECT
            ct.country,
            ci.city_id,
            IFNULL(#{addressQuery},'') addressCol, //为传入查询条件,构造虚拟列，虚拟列为查询条件参数值
            IFNULL(#{districtQuery},'') districtCol
        FROM
            country ct
        LEFT JOIN city ci ON ct.country_id = ci.country_id
        ORDER BY ct.country_id
    </select>
    
    <select id="selectAddressByCityId" parameterType="java.util.Map" resultMap="selectAddressByCityIdMap">
        SELECT
            ci.city,
            ads.address,
          ads.district
        FROM
            (
                SELECT
                    city,
                    city_id
                FROM
                    city ci
                WHERE
                    ci.city_id = #{cityId}
            ) ci
        LEFT JOIN address ads ON ads.city_id = ci.city_id
        <where>
            <if test="adr!=null and adr!=''">
                and ads.address RegExp #{adr}
            </if>
            <if test="dis!=null and dis!=''">
                ads.district Regexp #{dis}
            </if>
        </where>
    
    </select>

测试文件:

@Test
    public void findCountryCityAddressTest() throws JsonProcessingException {
        Map<String,Object> param = new HashMap<>();
        param.put("addressQuery","1168");
        List<Map<String, Object>> rs = countryManager.findCountryCityAddress(param);
        ObjectMapper mapper = new ObjectMapper();
        ObjectWriter writer = mapper.writerWithDefaultPrettyPrinter();
        System.out.println(writer.writeValueAsString(rs));
    }

测试结果:

[
        {
            "country": "Afghanistan",
            "cityList": [{
                    "city": "Kabul",
                    "addressList": [{
                            "address": "1168 Najafabad Parkway",
                            "district": "Kabol"
                        }
                    ]
                }
            ],
            "city_id": 251
        },
        {
            "country": "Algeria",
            "cityList": [],
            "city_id": 59
        }
    ]

可以看到，确实将查询条件通过column参数传入到第二个sql中，并执行成功

ps: ------tree table

vue:

<el-table-column label="机构名称" prop="orgName" min-width="150">
    <template slot-scope="scope">
    						<p :style="`margin-left: ${scope.row.__level * 20}px;margin-top:0;margin-bottom:0`">
    							<i @click="toggleFoldingStatus(scope.row)" class="permission_toggleFold" :class="toggleFoldingClass(scope.row)"></i>
    							<span class="c-click" @click="handleViewSyorg(scope.row)">{
       { scope.row.orgName }}</span>
    						</p>
    </template>
    </el-table-column>

sql:

(#{syuserId}) as syuserId就可以别sql转化未属性

![2019040221592339.png][]

<resultMap id="treeTable_ResultMap" type="com.alex.hainan.oas.base.entity.OrgTreeTableBO">
            <result column="ORG_ID" jdbcType="VARCHAR" property="orgId" />
            <result column="pid" jdbcType="VARCHAR" property="pid" />
            <result column="syuserId" jdbcType="VARCHAR" property="syuserId" />
        <collection property="children" ofType="com.alex.hainan.oas.base.entity.OrgTreeTableBO" javaType="java.util.List"
                    column="{pid=pid,syuserId=syuserId}" select="getChildSyorgList">
        </collection>
        </resultMap>
         
      <select id="query" resultMap="treeTable_ResultMap"  parameterType="java.util.Map">
        select
    		o.org_id pid, o.org_id, o.org_name,
    		o.parent_org_id,
            ### (#{syuserId}) as syuserId
            IFNULL(#{syuserId},'')  as syuserId
    	from alex.syorg o where o.del_flg=0
          and o.parent_org_id is null or o.parent_org_id =''
    	 <if test="syuserId !=null and syuserId !=''">
    			AND o.org_id  IN (select u.org_id  from alex.syuser_syorg u where
    			u.syuser_id = #{syuserId,jdbcType=VARCHAR} and u.del_flg=0)
    	</if>
      </select>
        <select id="getChildSyorgList" resultMap="treeTable_ResultMap"  parameterType="java.util.Map">
        SELECT
          o.org_id pid, o.org_id,  o.org_name,
          IFNULL(#{syuserId},'')  as syuserId
        FROM
            alex.syorg o
        LEFT JOIN  alex.review registRv ON (o.review_seq = registRv.review_seq AND o.del_flg =0 AND registRv.apply_type = '1')
         LEFT  JOIN alex.review platRv ON (o.review_seq = platRv.review_seq AND o.del_flg = 0 AND platRv.apply_type = '2')
        LEFT JOIN ( select  e.org_id,  f.batch_code as batch_code
                    from  alex.org_batch_data e 
    				INNER JOIN alex.batch_data f ON  (e.batch_seq = f.batch_seq AND f.del_flg = 0   AND f.batch_type = '1')
                    where e.del_flg = 0
                  )as ef ON o.org_id = ef.org_id
        WHERE
            o.del_flg = 0
          <if test="pid !=null and pid !=''">
            and o.parent_org_id =#{pid,jdbcType=VARCHAR}
          </if>
          <if test="syuserId !=null and syuserId !=''">
            AND o.org_id  IN (select u.org_id  from alex.syuser_syorg u where
            u.syuser_id = #{syuserId,jdbcType=VARCHAR} and u.del_flg=0)
          </if>
      </select>

js：

method:{
        formatConversion(parent, children, index = 0, family = [], elderIdentity = 'x') {
    			// children如果长度等于0，则代表已经到了最低层
    			// let page = (this.startPage - 1) * 10
    			if (children.length > 0) {
    				children.map((x, i) => {
    					// 设置 __level 标志位 用于展示区分层级
    					Vue.set(x, '__level', index);
    					// 设置 __family 为家族关系 为所有父级，包含本身在内
    					Vue.set(x, '__family', [...family, elderIdentity + '_' + i]);
    					// 本身的唯一标识  可以理解为个人的身份证咯 一定唯一。
    					Vue.set(x, '__identity', elderIdentity + '_' + i);
    					parent.push(x);
    					// 如果仍有子集，则进行递归
    					if (x.children.length > 0) this.formatConversion(parent, x.children, index + 1, [...family, elderIdentity + '_' + i], elderIdentity + '_' + i);
    				});
    			}
    			return parent;
    		}
    }

[2019040221592339.png]: /images/20220224/eff60fcff429400c9f6cdb09a1022e11.png