1.WINSW 的xml 文件最好为ANSI编码（windows电脑上）
2.WINSW使用时最好重新命名下winsw.exe和winsw.xml。相同名称情况下可能会有冲突，我有两个没有改名字，第三个服务死活启动不了。
Author: Nbad
小程序蓝牙打印的注意事项
1.绘制图片的宽度最好为256的倍数,否则处理不好会有错位。这是由于打印机的默认宽度为256，如果能处理好换行之内也无所谓。
2.写入数据时的write和write without response处理。
Mysql 5.7 配置允许存入emoji
[mysqld] character-set-server=utf8mb4 [mysql] default-character-set=utf8mb4
只要修改my.ini(位置:C:ProgramDataMySQL)文件,然后重启mysql服务即可.
注意数据库的编码为utf8mb4
SHOW VARIABLES LIKE 'character_set%';
Mysql中导出表格的信息
SELECT
COLUMN_NAME AS 列名,
cast(COLUMN_TYPE as CHAR) AS 数据类型,
cast(DATA_TYPE as CHAR) AS 字段类型,
CHARACTER_MAXIMUM_LENGTH AS 长度,
IS_NULLABLE AS 是否为空,
COLUMN_DEFAULT AS 默认值,
COLUMN_COMMENT AS 备注
FROM
INFORMATION_SCHEMA. COLUMNS
WHERE
table_schema = 'tobacco_asset'
AND
table_name = 'asset_base'
这样可以查出对应的表格每个字段的信息
idea 启动时报 address already in use
系统开启hyper-v
-
Disable hyper-v (which will required a couple of restarts)
dism.exe /Online /Disable-Feature:Microsoft-Hyper-V -
When you finish all the required restarts, reserve the port you want so hyper-v doesn’t reserve it back
netsh int ipv4 add excludedportrange protocol=tcp startport=<端口号> numberofports=1 -
Re-Enable hyper-V (which will require a couple of restart)
dism.exe /Online /Enable-Feature:Microsoft-Hyper-V /All
when your system is back, you will be able to bind to that port successfully.
把端口号改成6942~6991间的任一个数字
Ubuntu 下Mysql 安装时密码问题
1.安装以后没有设置密码
sudo cat /etc/mysql/debian.cnf通过这个查看mysql的默认用户名和密码
# Automatically generated for Debian scripts. DO NOT TOUCH! [client] host = localhost user = debian-sys-maint password = cOrWdhKDBv7LS86s socket = /var/run/mysqld/mysqld.sock [mysql_upgrade] host = localhost user = debian-sys-maint password = cOrWdhKDBv7LS86s socket = /var/run/mysqld/mysqld.sock
2.正常登录mysql，修改密码
alter user'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root'; flush privileges;
3.重新登陆即可
Java中的各种对象
POJO/JavaBean/DO/PO/DTO/VO/DAO
Mysql 根据时间的筛选语句
引用 https://www.cnblogs.com/shuilangyizu/p/8805384.html
--今天 select * from 表名 where to_days(时间字段名) = to_days(now()); --昨天 SELECT * FROM 表名 WHERE TO_DAYS( NOW( ) ) - TO_DAYS( 时间字段名) <= 1
AND TO_DAYS(NOW()) - TO_DAYS(update_time)>0
--本周 SELECT * FROM 表名 WHERE YEARWEEK( date_format( 时间字段名,'%Y-%m-%d' ) ) = YEARWEEK( now() ) ; --本月 SELECT * FROM 表名 WHERE DATE_FORMAT( 时间字段名, '%Y%m' ) = DATE_FORMAT( CURDATE( ) ,'%Y%m' ) --上一个月 SELECT * FROM 表名 WHERE PERIOD_DIFF(date_format(now(),'%Y%m'),date_format(时间字段名,'%Y%m') =1 --本年 SELECT * FROM 表名 WHERE YEAR( 时间字段名 ) = YEAR( NOW( ) ) --上一月 SELECT * FROM 表名 WHERE PERIOD_DIFF( date_format( now( ) , '%Y%m' ) , date_format( 时间字段名, '%Y%m' ) ) =1 --查询本季度数据 select * from `ht_invoice_information` where QUARTER(create_date)=QUARTER(now()); --查询上季度数据 select * from `ht_invoice_information` where QUARTER(create_date)=QUARTER(DATE_SUB(now(),interval 1 QUARTER)); --查询本年数据 select * from `ht_invoice_information` where YEAR(create_date)=YEAR(NOW()); --查询上年数据 select * from `ht_invoice_information` where year(create_date)=year(date_sub(now(),interval 1 year)); --查询当前这周的数据 SELECT name,submittime FROM enterprise WHERE YEARWEEK(date_format(submittime,'%Y-%m-%d')) = YEARWEEK(now()); --查询上周的数据 SELECT name,submittime FROM enterprise WHERE YEARWEEK(date_format(submittime,'%Y-%m-%d')) = YEARWEEK(now())-1; --查询当前月份的数据 select name,submittime from enterprise where date_format(submittime,'%Y-%m')=date_format(now(),'%Y-%m') --查询距离当前现在6个月的数据 select name,submittime from enterprise where submittime between date_sub(now(),interval 6 month) and now(); --查询上个月的数据 select name,submittime from enterprise where date_format(submittime,'%Y-%m')=date_format(DATE_SUB(curdate(), INTERVAL 1 MONTH),'%Y-%m') select * from ` user ` where DATE_FORMAT(pudate, ' %Y%m ' ) = DATE_FORMAT(CURDATE(), ' %Y%m ' ) ; select * from user where WEEKOFYEAR(FROM_UNIXTIME(pudate,'%y-%m-%d')) = WEEKOFYEAR(now()) select * from user where MONTH (FROM_UNIXTIME(pudate, ' %y-%m-%d ' )) = MONTH (now()) select * from [ user ] where YEAR (FROM_UNIXTIME(pudate, ' %y-%m-%d ' )) = YEAR (now()) and MONTH (FROM_UNIXTIME(pudate, ' %y-%m-%d ' )) = MONTH (now()) select * from [ user ] where pudate between 上月最后一天 and 下月第一天 where date(regdate) = curdate(); select * from test where year(regdate)=year(now()) and month(regdate)=month(now()) and day(regdate)=day(now()) SELECT date( c_instime ) ,curdate( ) FROM `t_score` WHERE 1 LIMIT 0 , 30
监听input的输入数字
/**
* 监听input的数据数字
* @param count 限制数量
* @param contentId input/textarea 输入框的id
* @param limitId 展示数字的span
*/
function initLimit(count, contentId, limitId) {
var lim = new limit();
lim.txtNote = document.getElementById(contentId);
lim.txtLimit = document.getElementById(limitId);
lim.limitCount = count;
lim.init();
function limit() {
var txtNote;//文本框
var txtLimit;//提示字数的input
var limitCount;//限制的字数
var txtLength;//到达限制时，字符串的长度
this.init = function () {
txtNote = this.txtNote;
txtLimit = this.txtLimit;
limitCount = this.limitCount;
txtNote.oninput = function () {
wordsLimit()
};
txtNote.oninput = function () {
wordsLimit()
};
txtLimit.innerText = limitCount;
};
function wordsLimit() {
var noteCount = txtNote.value.length;
var InPut = document.getElementById(contentId).value.length;
if (InPut < 1) {
//document.getElementById("stay").style.display="none";
}
if (InPut >= 1) {
//document.getElementById("stay").style.display="inline";
//document.getElementById("stay").style.color="green";
}
if (InPut > 70) {
//document.getElementById("stay").style.color="red";
}
if (noteCount > limitCount) {
txtNote.value = txtNote.value.substring(0, limitCount);
txtLimit.innerText = 0;
} else {
txtLimit.innerText = limitCount - noteCount;
}
txtLength = txtNote.value.length;//记录每次输入后的长度
}
}
}
MySql常用语句
mysql分析当前的查询线程
select * from information_schema.`PROCESSLIST` where info is not null;
或者
show processList
联表更新
UPDATE tobacco_product AS p, `temp_公司商品维护（通用）` AS t SET p.ONLINE_DATE_YEAR = CONVERT(STR_TO_DATE(t.`入网日期`, “%Y”),int) WHERE p.CIG_UPCS_CD = t.`条包装条形码`