<update id="updateBatch" parameterType="java.util.List">
    UPDATE DB.INVOICE  <!-- 修改的表明需要改 -->
    <trim prefix="SET" suffixOverrides=",">
        <trim prefix="INVOICE_NO = CASE" suffix="END,"> <!-- prefix INVOICE_NO 需要修改 -->
            <foreach collection="list" item="item" index="index">
                <if test="item.invoiceNo!=null"><!-- test中 invoiceNo 需要修改 -->
                    <!-- INVOICE_ID  SERIALNO 是已知条件需要修改 ，THEN后面是即将要set的值 -->
                    WHEN INVOICE_ID=#{item.invoiceId} AND SERIALNO=#{item.serialno} THEN #{item.invoiceNo}
                </if>
            </foreach>
        </trim>
        <trim prefix="INVOICE_CODE = CASE" suffix="END," >
            <foreach collection="list" item="item" index="index">
                <if test="item.invoiceCode!=null">
                    WHEN INVOICE_ID=#{item.invoiceId} AND SERIALNO=#{item.serialno} THEN #{item.invoiceCode}
                </if>
            </foreach>
        </trim>
    </trim>
    WHERE
    <foreach collection="list" item="item" index="index" open=" (" separator= ") OR (" close=")">
    INVOICE_ID=#{item.invoiceId} AND SERIALNO=#{item.serialno}
    </foreach>
</update>

注意建议300-500条以内，避免sql过长