<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="com.ruoyi.system.mapper.SysAgreementMapper">
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<!--
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协议版本是追加式表：一行一个已发布版本，旧版本永不修改。
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故这里没有 update/delete 语句，也没有 status 列——列表的「当前版本/历史版本」
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是下面 latest_flag 那个相关子查询实时算出来的（同类型中编号最大者即当前版本）。
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-->
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<resultMap type="SysAgreement" id="SysAgreementResult">
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<result property="agreementId" column="agreement_id" />
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<result property="agreementType" column="agreement_type" />
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<result property="version" column="version" />
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<result property="content" column="content" />
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<result property="latestFlag" column="latest_flag" />
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<result property="createBy" column="create_by" />
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<result property="createTime" column="create_time" />
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<result property="remark" column="remark" />
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</resultMap>
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<!--
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latest_flag 用相关子查询算，不用 join 派生表：join 会被 PageHelper 的 count SQL 一起带上，
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同类型多版本时行数被放大，列表就会出现重复行。子查询只在 select 列里，不影响 count。
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子查询不会返回 NULL——GROUP BY agreement_type 决定了每个类型至少有一行。
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create_by/create_time 就是列表里的「更新人/更新时间」：版本行不可修改，对它而言创建即发布。
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-->
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<sql id="selectAgreementVo">
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select a.agreement_id, a.agreement_type, a.version, a.content, a.create_by, a.create_time, a.remark,
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case when a.agreement_id = (select max(x.agreement_id) from sys_agreement x
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where x.agreement_type = a.agreement_type)
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then '1' else '0' end as latest_flag
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from sys_agreement a
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</sql>
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<select id="selectAgreementById" parameterType="Long" resultMap="SysAgreementResult">
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<include refid="selectAgreementVo"/>
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where a.agreement_id = #{agreementId}
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</select>
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<select id="selectAgreementList" parameterType="SysAgreement" resultMap="SysAgreementResult">
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<include refid="selectAgreementVo"/>
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<where>
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<!-- 协议编号是自增主键，按精确值筛 -->
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<if test="agreementId != null">
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AND a.agreement_id = #{agreementId}
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</if>
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<if test="agreementType != null and agreementType != ''">
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AND a.agreement_type = #{agreementType}
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</if>
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<!--
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「当前版本/历史版本」筛选。这里必须用双引号的 OGNL 字符串字面量（外层属性用单引号），
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写成 latestFlag == '1' 会被 OGNL 当成 char 对待，与 String 比永远为假 —— 筛选会静默失效。
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-->
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<if test='latestFlag != null and latestFlag == "1"'>
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AND a.agreement_id = (select max(x.agreement_id) from sys_agreement x
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where x.agreement_type = a.agreement_type)
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</if>
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<if test='latestFlag != null and latestFlag == "0"'>
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AND a.agreement_id != (select max(x.agreement_id) from sys_agreement x
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where x.agreement_type = a.agreement_type)
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</if>
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<if test="params.beginTime != null and params.beginTime != ''"><!-- 开始时间检索 -->
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AND date_format(a.create_time,'%Y%m%d') >= date_format(#{params.beginTime},'%Y%m%d')
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</if>
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<if test="params.endTime != null and params.endTime != ''"><!-- 结束时间检索 -->
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AND date_format(a.create_time,'%Y%m%d') <= date_format(#{params.endTime},'%Y%m%d')
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</if>
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</where>
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<!-- 最新发布的排最前（编号即发布顺序），不按类型分组：查「我刚发的那条」是最常见的诉求 -->
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order by a.agreement_id desc
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</select>
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<!--
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发布新版本：纯插入。没有任何 update —— 旧版本不做任何改动，
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它的「历史版本」身份由上面的 latest_flag 自动算出来。
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content 判 null 而不是判空串：清空后的空内容是一次有意义的覆盖，不该被 <if> 跳过。
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-->
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<insert id="insertAgreement" parameterType="SysAgreement">
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insert into sys_agreement (
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<if test="agreementType != null and agreementType != ''">agreement_type, </if>
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<if test="version != null and version != ''">version, </if>
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<if test="content != null">content, </if>
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<if test="remark != null and remark != ''">remark, </if>
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<if test="createBy != null and createBy != ''">create_by, </if>
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create_time
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)values(
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<if test="agreementType != null and agreementType != ''">#{agreementType}, </if>
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<if test="version != null and version != ''">#{version}, </if>
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<if test="content != null">#{content}, </if>
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<if test="remark != null and remark != ''">#{remark}, </if>
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<if test="createBy != null and createBy != ''">#{createBy}, </if>
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sysdate()
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)
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</insert>
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<select id="countByTypeAndVersion" resultType="int">
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select count(1) from sys_agreement
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where agreement_type = #{agreementType} and version = #{version}
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</select>
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</mapper>
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