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

补充：表单生成中设置

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>

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

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);```