Mybatis之SQLMapper大全 與常見問題

頭引入 -->

 

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >

<!--concat_ws(",",company_address,company_detail_address)-->

結果map映射-->

<resultMap id="itemPublish" type="itemPublish" >
    <id column="id" property="id" jdbcType="BIGINT" />
    <result column="platform_id" property="platformId" jdbcType="BIGINT" />
    <result column="seller_id" property="sellerId" jdbcType="BIGINT" />
    <result column="shop_id" property="shopId" jdbcType="BIGINT" />
    <result column="supply_seller_id" property="supplySellerId" jdbcType="BIGINT" />
    <result column="supply_shop_id" property="supplyShopId" jdbcType="BIGINT" />
    <result column="operator_id" property="operatorId" jdbcType="BIGINT" />
    <result column="item_name" property="itemName" jdbcType="VARCHAR" />
    <result column="cid" property="cid" jdbcType="BIGINT" />
    <result column="second_cid" property="secondCid" jdbcType="BIGINT" />
    <result column="brand_id" property="brandId" jdbcType="BIGINT" />
    <result column="unit" property="unit" jdbcType="VARCHAR" />
    <result column="origin" property="origin" jdbcType="VARCHAR" />
    <result column="ad" property="ad" jdbcType="VARCHAR" />
    <result column="industry_label" property="industryLabel" jdbcType="VARCHAR" />
    <result column="category_attributes" property="categoryAttributes" jdbcType="VARCHAR" />
    <result column="spec_attributes" property="specAttributes" jdbcType="VARCHAR" />
    <result column="sale_status" property="saleStatus" jdbcType="INTEGER" />
    <result column="packing_list" property="packingList" jdbcType="VARCHAR" />
    <result column="describe_url" property="describeUrl" jdbcType="VARCHAR" />
    <result column="created"  property="created" jdbcType="TIMESTAMP"/>
    <result column="modified" property="modified" jdbcType="TIMESTAMP"  />
    <result column="shop_cid" property="shopCid" jdbcType="BIGINT"  />
    <result column="listing_time" property="listingTime" jdbcType="TIMESTAMP" />
    <result column="delisting_time"  property="delistingTime" jdbcType="TIMESTAMP"/>
    <result column="operator" property="operator" jdbcType="INTEGER" />
    <result column="add_source" property="addSource" jdbcType="INTEGER" />
    <result column="store_status" property="storeStatus" jdbcType="INTEGER" />
    <result column="yn" property="yn" jdbcType="INTEGER" />
    <result column="sku_type" property="skuType" jdbcType="INTEGER" />
    <result column="attributes" property="attributes" jdbcType="INTEGER" />
    <result column="model_code" property="modelCode" jdbcType="INTEGER" />
    <result column="bar_code" property="barCode" jdbcType="INTEGER" />
    <result column="product_code" property="productCode" jdbcType="INTEGER" />
    <result column="sku_status" property="skuStatus" jdbcType="INTEGER" />
    <result column="weight" property="weight" jdbcType="INTEGER" />
    <result column="picture_url" property="pictureUrl" jdbcType="VARCHAR" />
    <result column="alt_images" property="altImages" jdbcType="VARCHAR" />
    <result column="sort_number" property="sortNumber" jdbcType="INTEGER" />
    <result column="copy_status" property="copyStatus" jdbcType="INTEGER" />
    <result column="publishuserId" property="publishuserId" jdbcType="BIGINT" />
    <result column="cash_coupon_support" property="cashCouponSupport" jdbcType="INTEGER" />
    <result column="meet_coupon_support" property="meetCouponSupport" jdbcType="INTEGER" />
    <result column="vip_discount_support" property="vipDiscountSupport" jdbcType="INTEGER" />
    <result column="detail_page_qrcode" property="detailPageQrcode" jdbcType="VARCHAR" />

</resultMap>

若resultMap中jdbcType與mysql中有不同 (例如庫中數據是tyint類型/對象中是String類型)，可以自動轉化,，可以set到對象中

 

標籤定義-->

<sql id="Example_Where_Clause" >
    <where >
      <foreach collection="oredCriteria" item="criteria" separator="or" >
        <if test="criteria.valid" >
          <trim prefix="(" suffix=")" prefixOverrides="and" >
            <foreach collection="criteria.criteria" item="criterion" >
              <choose >
                <when test="criterion.noValue" >
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue" >
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue" >
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue" >
                  and ${criterion.condition}
                  <foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>

 

insert語句-->

<insert id="itemPublish" parameterType="item" useGeneratedKeys="true" keyProperty="id">
    insert into item (platform_id, seller_id,
      shop_id, supply_seller_id, supply_shop_id, operator_id,
      item_name, cid,second_cid, brand_id,
      unit, origin, ad,
      category_attributes, spec_attributes, sale_status,
      packing_list, describe_url, created,
      modified, shop_cid, listing_time,
      delisting_time, operator,
      add_source, store_status, yn,copy_status,publishuserId,industry_label,
      cash_coupon_support,meet_coupon_support,vip_discount_support,detail_page_qrcode
      )
    values ( #{platformId,jdbcType=BIGINT}, #{sellerId,jdbcType=BIGINT},
      #{shopId,jdbcType=BIGINT}, #{supplySellerId,jdbcType=BIGINT}, #{supplyShopId,jdbcType=BIGINT}, #{operatorId,jdbcType=INTEGER},
      #{itemName,jdbcType=VARCHAR}, #{cid,jdbcType=BIGINT},#{secondCid}, #{brandId,jdbcType=BIGINT},
      #{unit,jdbcType=VARCHAR}, #{origin,jdbcType=VARCHAR}, #{ad,jdbcType=VARCHAR},
      #{categoryAttributes,jdbcType=VARCHAR}, #{specAttributes,jdbcType=VARCHAR}, #{saleStatus,jdbcType=INTEGER},
      #{packingList,jdbcType=VARCHAR}, #{describeUrl,jdbcType=VARCHAR}, now(),
      now(),#{shopCid,jdbcType=BIGINT},#{listingTime,jdbcType=TIMESTAMP},
      #{delistingTime,jdbcType=TIMESTAMP}, #{operator,jdbcType=INTEGER},
      #{addSource,jdbcType=INTEGER},#{storeStatus,jdbcType=INTEGER},1,#{copyStatus,jdbcType=INTEGER}, #{publishuserId,jdbcType=BIGINT},#{industryLabel,jdbcType=VARCHAR},
      #{cashCouponSupport,jdbcType=INTEGER},#{meetCouponSupport,jdbcType=INTEGER},#{vipDiscountSupport,jdbcType=INTEGER},#{detailPageQrcode,jdbcType=VARCHAR}
      )
  </insert>

<insert id="insertSelective" parameterType="com....ItemImport" >
    insert into item_import_tmp
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        id,
      </if>
      <if test="platformId != null" >
        platform_id,
      </if>
      <if test="itemName != null" >
        item_name,
      </if>
      <if test="batchNo != null" >
        batch_no,
      </if>
      <if test="state != null" >
        state,
      </if>
      <if test="failNum != null" >
        fail_num,
      </if>
      <if test="failReason != null" >
        fail_reason,
      </if>
      <if test="created != null" >
        created,
      </if>
      <if test="modified != null" >
        modified,
      </if>
      <if test="yn != null" >
        yn,
      </if>
      <if test="itemInfo != null" >
        item_info,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        #{id,jdbcType=BIGINT},
      </if>
      <if test="platformId != null" >
        #{platformId,jdbcType=BIGINT},
      </if>
      <if test="itemName != null" >
        #{itemName,jdbcType=VARCHAR},
      </if>
      <if test="batchNo != null" >
        #{batchNo,jdbcType=VARCHAR},
      </if>
      <if test="state != null" >
        #{state,jdbcType=INTEGER},
      </if>
      <if test="failNum != null" >
        #{failNum,jdbcType=INTEGER},
      </if>
      <if test="failReason != null" >
        #{failReason,jdbcType=VARCHAR},
      </if>
      <if test="created != null" >
        #{created,jdbcType=TIMESTAMP},
      </if>
      <if test="modified != null" >
        #{modified,jdbcType=TIMESTAMP},
      </if>
      <if test="yn != null" >
        #{yn,jdbcType=INTEGER},
      </if>
      <if test="itemInfo != null" >
        #{itemInfo,jdbcType=LONGVARCHAR},
      </if>
    </trim>
  </insert>

  <!-- 批量添加item_picture信息 -->
    <insert id="insertItemPictureList" parameterType="java.util.List">
        insert into item_picture( platform_id, item_id, shop_id, seller_id, picture_url,alt_images, sort_number, created, modified, yn)
        values
        <foreach collection="list" item="itemPicture" index="index" separator=",">
            (#{itemPicture.platformId,jdbcType=BIGINT},
            #{itemPicture.itemId,jdbcType=BIGINT},
            #{itemPicture.shopId,jdbcType=BIGINT},
            #{itemPicture.sellerId,jdbcType=BIGINT},
            #{itemPicture.pictureUrl,jdbcType=VARCHAR},
            #{itemPicture.altImages,jdbcType=VARCHAR},
            #{itemPicture.sortNumber,jdbcType=INTEGER},
           now(),now(), 1)
        </foreach>
    </insert>

刪除語句-->

  <delete id="deleteByPrimaryKey" parameterType="java.lang.Long" >
    delete from item_import_tmp
    where id = #{id,jdbcType=BIGINT}
  </delete>

  <delete id="deleteByExample" parameterType="com.jd.ecc.b2b.item.domain.item.domain.ItemImportExample" >
    delete from item_import_tmp
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
  </delete>

 

修改語句-->  

<update id="updateSaleStatus" parameterType="map">
    UPDATE item
    <set>
        store_status = #{storeStatus},
        <if test="saleStatus != null">
            sale_status = #{saleStatus}
        </if>
    </set>
    WHERE id = #{itemId}
    AND platform_id = #{platformId}
  </update>

<update id="updateItem" parameterType="itemPublish">
        update item set
        operator_id=#{operatorId,jdbcType=INTEGER},item_name=#{itemName,jdbcType=VARCHAR},cid=#{cid,jdbcType=BIGINT},second_cid=#{secondCid},brand_id=#{brandId,jdbcType=BIGINT},
        unit=#{unit,jdbcType=VARCHAR},origin=#{origin,jdbcType=VARCHAR},ad=#{ad,jdbcType=VARCHAR},category_attributes=#{categoryAttributes,jdbcType=VARCHAR},
        spec_attributes=#{specAttributes,jdbcType=VARCHAR},sale_status=#{saleStatus},store_status = #{storeStatus},
        packing_list=#{packingList,jdbcType=VARCHAR},describe_url=#{describeUrl,jdbcType=VARCHAR},shop_cid=#{shopCid,jdbcType=BIGINT},
        operator=#{operator,jdbcType=INTEGER},industry_label=#{industryLabel},
        cash_coupon_support=#{cashCouponSupport},meet_coupon_support=#{meetCouponSupport},vip_discount_support=#{vipDiscountSupport}
        <if test="publishuserId != null">
            ,publishuserId=#{publishuserId}
        </if>
        where id=#{id,jdbcType=BIGINT} and platform_id=#{platformId}  and yn=1
    </update>

 

查詢語句 -->

<select id="queryItems" parameterType="sellSupplyItemInfoVo" resultMap="SellSupplyItemMap">
        select DISTINCT i.id itemId,i.platform_id, i.item_name, sii.supply_seller_id, sii.supply_shop_id,ip.picture_url,
        category.cname1, category.cname2, category.cname3, category.cname4
        from shop_item_library sii
        JOIN item i
        on sii.item_id=i.id
        and i.store_status = 30
        and sii.supply_status = 0
        JOIN item_picture ip
        on i.id = ip.item_id
        LEFT JOIN item_sku isk
        on i.id = isk.item_id
        LEFT JOIN item_brand ib
        on i.brand_id = ib.id
        JOIN
        (
        SELECT c4.c_name cname1,c3.c_name cname2,c2.c_name cname3,c1.c_name cname4,c1.cid cid
        FROM item_category c1
        LEFT JOIN item_category c2 ON c1.parent_cid = c2.cid
        LEFT JOIN item_category c3 ON c2.parent_cid = c3.cid
        LEFT JOIN item_category c4 ON c3.parent_cid = c4.cid
        WHERE
        c1.platform_id = #{platformId}
        <if test="cid != null and cid != ''">
            And c1.cid= #{cid}
        </if>
        ) category ON i.cid = category.cid
        where sii.supply_seller_id = #{supplySellerId}
        AND i.platform_id = #{platformId}
        <if test="productCode != null and productCode != ''">
            AND isk.product_code LIKE CONCAT('%', #{productCode},'%' )
        </if>
        <if test="modelCode != null and modelCode != ''">
            AND isk.model_code LIKE CONCAT('%', #{modelCode},'%' )
        </if>
        <if test="itemName != null and itemName != ''">
            AND i.item_name LIKE CONCAT('%', #{itemName},'%' )
        </if>
    </select>

 

<select id="selectByExample" resultMap="BaseResultMap" parameterType="com....ItemImportExample" >
    select
    <if test="distinct" >
      distinct
    </if>
    'true' as QUERYID,
    <include refid="Base_Column_List" />
    from item_import_tmp
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
    <if test="orderByClause != null" >
      order by ${orderByClause}
    </if>
  </select>

時間判斷

<if test="endTime != null">
  AND up.audit_time &lt; DATE_ADD(#{endTime}, INTERVAL 1 DAY)
</if>

一次更新多條：

<update id="batchUpdate" parameterType="list">
    update item_category
    <trim prefix="set" suffixOverrides=",">
      <trim prefix="cate_code_path =case" suffix="end,">
        <foreach collection="list" item="i" index="index">
          <if test="i.cateCodePath!=null">
            when (cid = #{i.cid} and platform_id = #{i.platformId}) then #{i.cateCodePath}
          </if>
        </foreach>
      </trim>


      <trim prefix="cate_name_path =case" suffix="end," >
        <foreach collection="list" item="i" index="index">
          <if test="i.cateNamePath!=null">
            when (cid = #{i.cid} and platform_id = #{i.platformId}) then #{i.cateNamePath}
          </if>
        </foreach>
      </trim>
    </trim>
    where
    <foreach collection="list" separator="or" item="i" index="index">
      (cid = #{i.cid} and platform_id = #{i.platformId})
    </foreach>

  </update>

 

MapperSQL常見問題

1、我們在寫sql的時候，在WHERE 條件中會寫這樣的語句：

<if test="wmHasRead != null and wmHasRead !=''"><![CDATA[AND wm_has_read = #{wmHasRead}]]></if>

此時要注意wmHasRead 這個字段是Integer類型，我們用了<if test="wmHasRead != null and wmHasRead !=''">來判斷是否執行此條件，那麼這樣即使這個字段你傳了正確的值也不會執行，去掉標黃色部分就好了，應爲mybatis底層會檢測此字段的類型，類型不予數據庫中相符會自動跳過這個字段。

2、SELECT E_Name FROM Employees_China
      UNION ALL
      SELECT E_Name FROM Employees_USA

默認地，UNION 操作符選取不同的值。如果允許重複的值，請使用 UNION ALL。

3、DISTINCT用法，跟在select 後方，去除重複的行

4、有時候我們XML憑藉的SQL過於複雜，調試bug的時候如果想打印sql的話SpringBoot用如下配置，標紅爲dao接口路徑

      logging.level.com.csdn.bspo.system.dao.mapper=debug

5、DATE_FORMAT(WARRANTY_END_TIME,'%Y-%m-%d %H:%i:%S')函數可以吧sql中的時間格式化，通常用來查詢，但是如果將它用來進行時間範圍查詢的話邊界會查詢不出，and DATE_FORMAT(WARRANTY_END_TIME,'%Y-%m-%d %H:%i:%S') = "2019-11-14 00:00:00"，此處即時你的數據庫timestamp時間是2019-11-14 00:00:00也查詢不出，可以用去掉函數直接比較的方式

 

最後說一下CDATA 區段的用法：

  <select id="queryItemCategoryAttrIds" resultType="java.lang.String">
    <![CDATA[
        SELECT concat(id,'-',uuid) as uuid
        FROM item_category_attr_import_tmp icit
        WHERE icit.platform_id = #{platformId} AND icit.yn = 1 AND icit.status in(10,40)
        and icit.try_num < 5
    ]]>
    ORDER BY try_num
    limit 500
  </select>

 

假如您在 XML 文檔中放置了一個類似 "<" 字符，那麼這個文檔會產生一個錯誤，在 XML 中有 5 個預定義的實體引用：

 

&lt;	<	小於
&gt;	>	大於
&amp;	&	和號
&apos;	'	省略號
&quot;	"	引號

 

在 XML 元素中，"<" 和 "&" 是非法的。
"<" 會產生錯誤，因爲解析器會把該字符解釋爲新元素的開始。
"&" 也會產生錯誤，因爲解析器會把該字符解釋爲字符實體的開始。

關於 CDATA 部分的註釋：
CDATA 部分不能包含字符串 "]]>"。也不允許嵌套的 CDATA 部分。
標記 CDATA 部分結尾的 "]]>" 不能包含空格或折行。

 

注: where 1=1 在特殊的環境會報錯，如果我們有特殊需要的話不能寫，

      <insert id="itemPublish" parameterType="item" useGeneratedKeys="true" keyProperty="id">   主鍵返回，

      也有insert多條，返回insert條數的寫法

推薦1:自動尋找DAOmapper方法對應XMLsql的插件:myBatisCodeHelperPro插件，mapper中擊小鳥直接飛到對應的xml,  自動創建xml, 如果沒有對應的xml會報紅, alt+Enter會自動生成對應的xml-不過SQL需要自己寫。。

 

推薦2:mybatis熱部署 插件  JRebel  
和IDEA自帶的tomcat熱部署區別： 本身默認的只能進行方法修改的熱部署，及靜態資源文件的熱部署
意味着：一個Module的開發除了日常的開關機、切換Module，從開始到結束 只需要  Ctrl +　f9

Jrebal需要破解 http://blog.csdn.net/lsgqjh/article/details/52848172