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

java 中 字符串的 slipt() 方法

1. slipt() 方法会在分割完成后，对获取到的数组从末端开始验证是否为""，若 true 则，数组长度 -1 ，直到遇到一个不为"" 的元素。
2. 此时，在这个不为 "" 的元素之前的所有其他 "" 元素依旧保留。（未验证数组起始端的 "" 是否验证排除）
3. 不知道从 1.5 开始到现在最新版本，该方法是否发生变化。

    public static void main(String[] args) {

	String s = "";
	String[] ss =  s.split(",");
        System.out.println(ss.length);//1
        System.out.println(Arrays.toString(ss));//[]
        System.out.println(ss == null);//false
        System.out.println(ss[0] == null);//false

        String s1 = "123-123.2-1--";
        String[] ss1 =  s1.split("-");
        System.out.println(ss1.length);//3
        System.out.println(Arrays.toString(ss1));//[123, 123.2, 1]

        String s2 = "123--123.2-1--";
        String[] ss2 =  s2.split("-");
        System.out.println(ss2.length);//4
        System.out.println(Arrays.toString(ss2));//[123, , 123.2, 1]
    }

参考 ：
https://blog.csdn.net/qq_27093465/article/details/54910323

MySql 中根据 判断某个字段（字符串）的长度后 按不同情况更新 同一个字段的值 的方法：

UPDATE m_levelformajor 

SET type = (
	CASE
		WHEN 1 < LENGTH(number) AND  LENGTH(number) < 3 THEN "2"
		WHEN 3 < LENGTH(number) AND  LENGTH(number) < 5 THEN "3"
		WHEN 6 <= LENGTH(number) THEN "4"
		WHEN number IS NULL THEN "1"
	ELSE
		"1"
	END
)

UPDATE m_levelformajor 
SET type = (
	CASE

		WHEN number IS NULL THEN "1"
	ELSE
		 "1"
	END
)

SELECT id,name, number, type, parent_id,parent_ids , LENGTH(number) FROM m_levelformajor
SELECT id,name, number, type, parent_id,parent_ids , LENGTH(number) FROM m_levelformajor WHERE  LENGTH(number) <5 AND  LENGTH(number) > 3
SELECT id,name, number, type, parent_id,parent_ids , LENGTH(number) FROM m_levelformajor WHERE  1 < LENGTH(number)  AND  LENGTH(number) <3
SELECT id,name, number, type, parent_id,parent_ids , LENGTH(number) FROM m_levelformajor WHERE   LENGTH(number) <1``` 

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 ;

为 jp 工具添加自定义方法，实现 js 的 unicode 编码

在 jeeplus.js 中的添加方法

(function(){
	jp = {

	        /** 实现 unicode 编码 */
	        toUnicode : function (s) {
	            var str = "";
	            for (var i = 0; i < s.length; i++) {
	                str +="\\u"+('0000' + s.charCodeAt(i).toString(16)).slice(-4)+"";
	            }
	            return str;
	        },	
	}
})(jQuery);

实现效果：

需要注意的是："\u0061\u0062\u0063" 中间需要转义字符：
"\\u0061\\u0062\\u0063"