MyBatis动态增改，多字段模糊查询

示例：
insert

    insert into bargain_products
    <trim prefix="(" suffix=")" suffixOverrides=",">
        <if test="id != null and id != ''">id,</if>
        <if test="userid != null and userid != ''">user_id,</if>
        <if test="productName != null and productName != ''">product_name,</if>
        <if test="type != null and type != ''">type,</if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
        <if test="id != null and id != ''">#{id},</if>
        <if test="userid != null and userid != ''">#{userid},</if>
        <if test="productName != null and productName != ''">#{productName},</if>
        <if test="type != null and type != ''">#{type},</if>
    </trim>

update

update bargain_products
    <trim prefix="set" suffixOverrides=",">
        <if test="productName != null and productName != ''">product_name = #{productName},</if>
        <if test="type != null and type != ''">type = #{type},</if>
        <if test="texture != null and texture != ''">texture = #{texture},</if>
    </trim>
    where id = #{id}

select

 SELECT
        bp.id,
        bp.user_id userid,
        bp.product_name productName,
        bp.type,
        DATE_FORMAT(bp.create_time,'%Y-%m-%d') createTime
    FROM
        bargain_products bp
    LEFT JOIN sys_user sus ON bp.user_id = sus.userid
    <where>
        <if test="secondLevel != null and secondLevel != ''">
            sus.second_level = #{secondLevel}
        </if>
        <if test="fuzzyQuery != null and fuzzyQuery != '' ">
            and CONCAT(bp.product_name, bp.type) LIKE "%"#{fuzzyQuery}"%"
        </if>
    </where>
    ORDER BY bp.create_time DESC

多字段模糊查询中如果有一个字段为null，则返回的也是NULL，那么这一条记录可能就会被错过，怎么处理呢，我这边使用的是IFNULL进行判断

<if test="fuzzyQuery != null and fuzzyQuery != '' ">
       and CONCAT(IFNULL(bp.product_name,''), IFNULL( bp.type,'')) LIKE "%"#{fuzzyQuery}"%"
</if>

delete
要么就直接删

	DELETE
	FROM
		bargain_products
	WHERE
		id = 'BP-6ec77c53464f43afbe55b23d4a4e7b7d'

如果需要加别名的格式

DELETE bp FROM bargain_products bp WHERE bp.id ='BP-6ec77c5346'