为以下代码在右侧生成注释<?xml version="1.0" encoding="UTF-8" ?>
<!-- sky-server\src\main\resources\mapper\OrderMapper.xml -->
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.sky.mapper.OrderMapper">
<insert id="insert" useGeneratedKeys="true" keyProperty="id">
insert into orders(number, status, user_id, address_book_id, order_time, checkout_time, pay_method, pay_status, amount, remark, phone, address, user_name, consignee, cancel_reason, rejection_reason, cancel_time, estimated_delivery_time,
delivery_status, delivery_time, pack_amount, tableware_number, tableware_status)
values (#{number}, #{status}, #{userId}, #{addressBookId}, #{orderTime}, #{checkoutTime}, #{payMethod}, #{payStatus}, #{amount}, #{remark}, #{phone}, #{address}, #{userName}, #{consignee}, #{cancelReason}, #{rejectionReason}, #{cancelTime}, #{estimatedDeliveryTime},
#{deliveryStatus}, #{deliveryTime}, #{packAmount}, #{tablewareNumber}, #{tablewareStatus})
</insert>
<update id="update" parameterType="com.sky.entity.Orders">
update orders
<set>
<if test="cancelReason != null and cancelReason!='' ">
cancel_reason=#{cancelReason},
</if>
<if test="rejectionReason != null and rejectionReason!='' ">
rejection_reason=#{rejectionReason},
</if>
<if test="cancelTime != null">
cancel_time=#{cancelTime},
</if>
<if test="payStatus != null">
pay_status=#{payStatus},
</if>
<if test="payMethod != null">
pay_method=#{payMethod},
</if>
<if test="checkoutTime != null">
checkout_time=#{checkoutTime},
</if>
<if test="status != null">
status = #{status},
</if>
<if test="deliveryTime != null">
delivery_time = #{deliveryTime}
</if>
</set>
where id = #{id}
</update>
<select id="pageQuery" resultType="com.sky.entity.Orders">
select * from orders
<where>
<if test="number != null and number!=''">
and number like concat('%',#{number},'%')
</if>
<if test="phone != null and phone!=''">
and phone like concat('%',#{phone},'%')
</if>
<if test="userId != null">
and user_id = #{userId}
</if>
<if test="status != null">
and status = #{status}
</if>
<if test="beginTime != null">
and begin_time = #{beginTime}
</if>
<if test="endTime != null">
and end_time = #{endTime}
</if>
</where>
order by order_time desc
</select>
<select id="sumByMap" resultType="java.lang.Double">
select sum(amount) from orders
<where>
<if test="begin != null">
and order_time > #{begin}
</if>
<if test="end != null">
and order_time < #{end}
</if>
<if test="status != null">
and status = #{status}
</if>
</where>
</select>
<select id="getOrderCount" resultType="java.lang.Integer">
select count(id) from orders
<where>
<if test="begin != null">
and order_time > #{begin}
</if>
<if test="end != null">
and order_time < #{end}
</if>
<if test="status != null">
and status = #{status}
</if>
</where>
</select>
<select id="getSalesTop10" resultType="com.sky.dto.GoodsSalesDTO">
select od.name,sum(od.number) number
from order_detail od,orders o
where od.order_id = o.id and o.status = 5
<if test="begin != null">
and o.order_time > #{begin}
</if>
<if test="end != null">
and o.order_time < #{end}
</if>
group by od.name
order by number desc
limit 0,10
</select>
</mapper>
在使用Mybatis进行数据库查询时，若采用<iftest=status!=nullandstatus!=''>进行判空操作，会误将status为0视为null，导致查询结果异常。本文解析了这一误区，并提供了正确的判空逻辑实现方式。
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