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版权声明:本文由 低调小熊猫 发表于 低调小熊猫的博客
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文章链接:https://aodeng.cc/archives/mybatisgaoji
简介
聚集元素用来处理“一对多”的关系。需要指定映射的Java实体类的属性,属性的javaType(一般为ArrayList);列表中对象的类型ofType(Java实体类);对应的数据库表的列名称;
额,估计这样说大家听不懂,简单的意思就是把两张表联系起来,用于解决一些奇怪的需求
代码
1.定义简单的sql片段
<!-- 基本查询-->
<sql id="vo_select">
SELECT
vo.expenseId,
vo.projectId,
vo.expenseUserId,
sua.realName as expenseUserName,
vo.expenseTime,
vo.expenseTypeId,
vo.beneficialDepartmentId,
sd.name as beneficialDepartmentName,
vo.currencyId,
vo.money,
vo.paperCheckerId,
vo.paperCheckerTime,
vo.paidDepartmentId,
vo.paidUserId,
vo.paidTime,
vo.expenseNote,
vo.description,
vo.currentStatus,
vo.invoiceAmount,
vo.paperFlag,
vo.recordFlag,
vo.createUserId,
vo.createTime
FROM p_expense vo
INNER JOIN sys_user_archive sua ON sua.userId=vo.expenseUserId
INNER JOIN sys_department sd ON sd.departmentId=vo.beneficialDepartmentId
</sql>
2.查询条件拼接,返回resultMap
<select id="findAll" parameterType="Pasv" resultMap="pexpenseMap">
<include refid="vo_select"/>
WHERE 1=1
<!--根据登陆人判断流程审核步骤的人是否一样 -->
<if test="vo.userId !=null and vo.userId !=''">
AND
(
EXISTS(
select 0 from p_expense_flow pef
where pef.flag=0 and pef.checkUserIds like concat('%#',#{vo.userId},'#%')
AND pef.expenseID=vo.expenseId
)
)
</if>
<!-- 根据时间查询 -->
<if test="vo.searchStartTime !=null and vo.searchStartTime !=''">
AND vo.createTime >=DATE_FORMAT(#{vo.searchStartTime},'%Y-%m-%d')
</if>
<if test="vo.searchEndTime !=null and vo.searchEndTime !=''">
AND vo.createTime <DATE_FORMAT(date_add(#{vo.searchEndTime}, INTERVAL 1 day),'%Y-%m-%d')
</if>
<!-- 注释掉是避免从我的任务中查询显示一条数据-->
<!-- <if test="null!=vo.expenseId and ''!=vo.expenseId">
AND vo.expenseId = #{vo.expenseId}
</if> -->
<if test="null!=vo.projectId and ''!=vo.projectId">
AND vo.projectId = #{vo.projectId}
</if>
<if test="null!=vo.expenseUserId and ''!=vo.expenseUserId">
AND vo.expenseUserId = #{vo.expenseUserId}
</if>
<if test="null!=vo.expenseTime and ''!=vo.expenseTime">
AND vo.expenseTime = #{vo.expenseTime}
</if>
<if test="null!=vo.expenseTypeId and ''!=vo.expenseTypeId">
AND vo.expenseTypeId = #{vo.expenseTypeId}
</if>
<if test="null!=vo.beneficialDepartmentId and ''!=vo.beneficialDepartmentId">
AND vo.beneficialDepartmentId = #{vo.beneficialDepartmentId}
</if>
<if test="null!=vo.currencyId and ''!=vo.currencyId">
AND vo.currencyId = #{vo.currencyId}
</if>
<if test="null!=vo.money and ''!=vo.money">
AND vo.money = #{vo.money}
</if>
<!-- 根据报销人 -->
<if test="vo.searchName !=null and vo.searchName !=''">
AND sua.realName LIKE CONCAT(CONCAT('%', #{vo.searchName}),'%')
</if>
<if test="null!=vo.paperCheckerId and ''!=vo.paperCheckerId">
AND vo.paperCheckerId = #{vo.paperCheckerId}
</if>
<if test="null!=vo.paperCheckerTime and ''!=vo.paperCheckerTime">
AND vo.paperCheckerTime = #{vo.paperCheckerTime}
</if>
<if test="null!=vo.paidDepartmentId and ''!=vo.paidDepartmentId">
AND vo.paidDepartmentId = #{vo.paidDepartmentId}
</if>
<if test="null!=vo.paidUserId and ''!=vo.paidUserId">
AND vo.paidUserId = #{vo.paidUserId}
</if>
<if test="null!=vo.paidTime and ''!=vo.paidTime">
AND vo.paidTime = #{vo.paidTime}
</if>
<if test="null!=vo.description and ''!=vo.description">
AND vo.description = #{vo.description}
</if>
<if test="null!=vo.currentStatus and ''!=vo.currentStatus">
AND vo.currentStatus = #{vo.currentStatus}
</if>
<if test="null!=vo.invoiceAmount and ''!=vo.invoiceAmount">
AND vo.invoiceAmount = #{vo.invoiceAmount}
</if>
<if test="null!=vo.paperFlag and ''!=vo.paperFlag">
AND vo.paperFlag = #{vo.paperFlag}
</if>
<if test="null!=vo.recordFlag and ''!=vo.recordFlag">
AND vo.recordFlag = #{vo.recordFlag}
</if>
<if test="null!=vo.createUserId and ''!=vo.createUserId">
AND vo.createUserId = #{vo.createUserId}
</if>
<if test="null!=vo.createTime and ''!=vo.createTime">
AND vo.createTime = #{vo.createTime}
</if>
<if test="null!=vo.enabled and ''!=vo.enabled">
AND vo.enabled = #{vo.enabled}
</if>
<!-- 根据报销金额范围查询 -->
<if test="vo.searchStartMoney !=null and vo.searchStartMoney !='' and vo.searchStartMoney!=0">
and vo.money <![CDATA[ >= ]]> #{vo.searchStartMoney}
</if>
<if test="vo.searchEndMoney !=null and vo.searchEndMoney !='' and vo.searchEndMoney!=0">
and vo.money <![CDATA[ <= ]]> #{vo.searchEndMoney}
</if>
</select>
3.定义resultMap,用于上面返回的resultMap,重点在于collection,先看代码,我下面解释
<resultMap type="com.account.web.vo.project.PExpenseVo" id="pexpenseMap">
<id column="expenseId" property="expenseId"/>
<result column="projectId" property="projectId"/>
<result column="expenseUserId" property="expenseUserId"/>
<result column="expenseUserName" property="expenseUserName"/>
<result column="expenseTime" property="expenseTime"/>
<result column="expenseTypeId" property="expenseTypeId"/>
<result column="beneficialDepartmentId" property="beneficialDepartmentId"/>
<result column="beneficialDepartmentName" property="beneficialDepartmentName"/>
<result column="currencyId" property="currencyId"/>
<result column="money" property="money"/>
<result column="paperCheckerId" property="paperCheckerId"/>
<result column="paperCheckerTime" property="paperCheckerTime"/>
<result column="paidDepartmentId" property="paidDepartmentId"/>
<result column="paidUserId" property="paidUserId"/>
<result column="paidTime" property="paidTime"/>
<result column="expenseNote" property="expenseNote"/>
<result column="description" property="description"/>
<result column="currentStatus" property="currentStatus"/>
<result column="invoiceAmount" property="invoiceAmount"/>
<result column="paperFlag" property="paperFlag"/>
<result column="recordFlag" property="recordFlag"/>
<result column="createUserId" property="createUserId"/>
<result column="createTime" property="createTime"/>
<collection property="checkers" ofType="com.account.web.vo.admin.system.SysUserArchiveVo"
select="findChecker3" column="{expenseId2=expenseId}">
</collection>
</resultMap>
4.定义collection用的sql片段
<select id="findChecker3" resultType="com.account.web.vo.admin.system.SysUserArchiveVo">
select pef.expenseFlowId,sua.userId,sua.realName,pef.folwMomentId as folwMomentId
from sys_user_archive sua
INNER JOIN p_expense_flow pef ON pef.checkUserId =sua.userId
AND pef.expenseid=#{expenseId2}
</select>
低调小熊猫独家解析
先给大家看一张图,我就是靠这一张图学会的,不要说图看不清楚,自己ctrl+
ok,这样聪明的估计就学会了,不会的看上面代码吧
额,还是解释几个地方
<collection property="checkers" ofType="com.account.web.vo.admin.system.SysUserArchiveVo"
select="findChecker3" column="{expenseId2=expenseId}">
</collection>
1.property=”checkers”就是上面那个resultMap返回的实体类里面封装的一个集合属性。
2.ofType=”com.account.web.vo.admin.system.SysUserArchiveVo”就是集合的类型
3.select=”findChecker3”就是第四步使用的sql片段的id
4.column=”{expenseId2=expenseId}”那,这个就比较重要了,expenseId就是上面resultMap的字段的名字,expenseId2就是下面sql片段里面条件接收值的字段