<insert id="add">
      insert into t_watch_log
      <!-- 新增表字段 -->
         <trim prefix="(" suffix=")" suffixOverrides=",">
                 <if test="CustomerId != null and CustomerId !=''">CustomerId,</if>
                 <if test="watch_code != null and watch_code !=''"
 
>watch_code,</if>
        </trim>
    <!-- 注入控制層欄位 -->
    <trim prefix="values (" suffix=")" suffixOverrides=",">
        <if test="CustomerId != null and CustomerId !=''">#{CustomerId},</if>
        <if test="watch_code != null and watch_code !=''">#{watch_code},</if
 
>
    </trim>
</insert>

1、根據主鍵進行新增操作。傳入List集合，如果主鍵重複，則為更新操作。不重複，則是新增操作

<insert id="updateOilList" parameterType="Oil" >  
        insert into oilno(sinopec_code,content,density)  
        VALUES  
        <foreach collection="oilList" item="list" separator=",">  
            (#{list.sinopec_code},#{list.content},#{list.density})  
 

        </foreach>  
        ON DUPLICATE KEY UPDATE sinopec_code=VALUES(sinopec_code),content=VALUES(content),density=VALUES(density)
</insert>  

2、更新批量操作

<update id="updateOilList"  parameterType="java.util.List">  
    <foreach collection="oilList" item="item" index="index" separator=";">
        update oilno
        <set >
            <if test="item.density != null" >
                density = #{item.density},
            </if>
            <if test="item.listprice != null" >
                listprice = #{item.listprice},
            </if>
        </set>
        where oilclass = #{item.oilclass}
    </foreach>       
</update>

3、刪除批量操作

<delete id="deleteBatch" parameterType ="java.util.List">
    DELETE FROM im_base_account WHERE id in(
    <foreach item="o" collection="list" open="" separator="," close="" >
        #{o.accountId}
    </foreach>
    )
</delete>