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

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Mysql 中对一个表中的字段进行汇总计算后 赋值给 其中一个字段

如：招生计划表中，按照年份、省份、批次、文理科、学校 分组汇总后，将各专业招生计划数汇总后，赋值给该校该年度该批次该省份该文理科中的 招生计划总数。

查询语句：

SELECT
	COUNT(zhaoshengjihua) AS jihuazongshu,
	zhaoshengjihuazongshu,
	shengfen,
	nianfen,
	wenlike,
	pici,
	daxuedaima,
	daxuemingcheng
FROM
	d_zhaoshengjihuabiao
GROUP BY
	shengfen,
	nianfen,
	wenlike,
	pici,
	daxuedaima;

*zhaoshengjihuazongshu 字段中已经被赋值了，原来该字段中的值为空

最开始写出的 sql 如下，但是完全不正确。

UPDATE d_zhaoshengjihuabiao a
SET a.zhaoshengjihuazongshu = (
	SELECT
		COUNT(b.zhaoshengjihua) AS b.cou,
		b.shengfen,
		b.nianfen,
		b.wenlike,
		b.pici,
		b.daxuedaima
	FROM
		d_zhaoshengjihuabiao b
	GROUP BY
		b.shengfen,
		b.nianfen,
		b.wenlike,
		b.pici,
		b.daxuedaima
)
WHERE
	b.shengfen = a.shengfen
AND b.nianfen = a.nianfen
AND b.wenlike = a.wenlike
AND b.pici = a.pici
AND b.daxuedaima = a.daxuedaima

在网上搜索后，看到如下 2 条 sql 做为参考：

-- 1
UPDATE au_window_re_project aw
SET aw.project_name = (
	SELECT
		ap.SERVICENAME
	FROM
		apas_service ap
	WHERE
		ap.unid = aw.PROJECT_ID
)

-- 2
UPDATE test_user_points AS a
LEFT JOIN (
	SELECT
		user_id,
		sum(point) AS point_count
	FROM
		test_point_log
	GROUP BY
		user_id
) AS b ON a.user_id = b.user_id
SET a.point_count = b.point_count

最终参考第 2 条 SQL 写出如下语句，可以实现要求：

UPDATE d_zhaoshengjihuabiao AS a
LEFT JOIN (
	SELECT
		COUNT(zhaoshengjihua) AS cou,
		shengfen,
		nianfen,
		wenlike,
		pici,
		daxuedaima
	FROM
		d_zhaoshengjihuabiao
	GROUP BY
		shengfen,
		nianfen,
		wenlike,
		pici,
		daxuedaima
) AS b ON (
	a.shengfen = b.shengfen
	AND a.wenlike = b.wenlike
	AND a.nianfen = b.nianfen
	AND a.pici = b.pici
	AND a.daxuedaima = b.daxuedaima
)
SET a.zhaoshengjihuazongshu = b.cou ;

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);``` 

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>