[jeeplus] 使用笔记 (gridSelect、datetimepicker etc.)

命名不规范，码农两行泪!!!😭
自己把自己坑哭

SSM 中 MyBatis 的某个 xxxMapper.xml 中，是否可以这样写？

            <if test="planMajorName != null and  planMajorName != '' and r1 = '0'">
                AND a.planmajorname = #{planMajorName}
            </if>
            <if test="planMajorName != null and  planMajorName != '' and (r1 = null or r1 = '')">
                AND a.planmajorname LIKE
                <if test="dbName == 'oracle'">'%'||#{planMajorName}||'%'</if>
                <if test="dbName == 'mssql'">'%'+#{planMajorName}+'%'</if>
                <if test="dbName == 'mysql'">concat('%',#{planMajorName},'%')</if>
            </if>
​

慎用 select *

当自己手写一些 sql 时，如果查找的对象/表中有封装了其他对象，那么，当 sql 中有 select * 时会导致封装对象为 Null 的现象。
因此，如果有会使用到封装的对象，那么 xml 中的 sql 还是加上映射关系吧。
eg:

    <!-- 根据年份、省份、高校、文理科、批次查找记录 findListByYPNWB -->
    <select id="findListByYPNWB" resultType="Eucode" >
        SELECT
        <include refid="EucodeColumns"/>
        FROM e_uecode a
        <include refid="EucodeJoins"/>
        WHERE a.year = #{year} AND a.province = #{province.id} AND a.universityid = #{university.id} AND a.wltype = #{wltype} AND a.schoolbatches = #{schoolBatches} AND (a.r3 != "2" OR  ISNULL(a.r3)) AND (a.r3 != "3"  OR  ISNULL(a.r3))
    </select>
​

根据某列中的值是否包含某个字符串筛选记录：

UPDATE m_levelformajor 
SET type = (
	CASE
		WHEN 1 < LENGTH(number) AND  LENGTH(number) < 3 THEN "22"
		WHEN 3 < LENGTH(number) AND  LENGTH(number) < 5 THEN "23"
		WHEN 6 <= LENGTH(number) THEN "24"
		WHEN number IS NULL THEN "21"
	ELSE
		"1"
	END
)
WHERE find_in_set('19db900b7129468385d96f96cd6c672a', parent_ids);

--设置本科专业记录的 type
UPDATE m_levelformajor 
SET type = (
	CASE
		WHEN 1 < LENGTH(number) AND  LENGTH(number) < 3 THEN "12"
		WHEN 3 < LENGTH(number) AND  LENGTH(number) < 5 THEN "13"
		WHEN 6 <= LENGTH(number) THEN "14"
		WHEN number IS NULL THEN "11"
	ELSE
		"1"
	END
)
WHERE find_in_set('e131fdeaf3f041b086bec4e68dd096c7', parent_ids);``` 
​