C#About DataGrid Get the mouse to select a row of data

... Recently, I just learned to use C# in combination with the database. The DataGrid control is used to display the information in the database table. There is an idea that when I click on a row in the database table, Get the data of the line, find relevant information on the Internet, for...


Sqlalchemy how to paginate without flask? Sqlalchemy lazy loading

... assuming the current page number current_page , total page number total_pages , how many lines page_size ,所以第一页的数据是在0~page_size-1的位置,以此类推,则取一页数据为: query = session.query(User).limit(page_size).offset((current_page-1)*page_size) ,懒加载指:直到真正使用查询结果时,才会触发上面的查询语句开始进行数据库查询。 的SQL查询语句,并不是一页的数据。...


Mysql data type (2018.09.26 study notes)

... 1.mysql data type 1.0 value 1.0.0 integer Tinyint smallint mediumint int bigint 1.0.1float decimal Float double 1.0.2 fixed point decimal Decimal Whether it is fixed or floating point, if the precision specified by the user exceeds the accuracy range, it will be rounded off. When the...


$.ajax() post method request parameter cannot be passed, request.getParameter() cannot get

... $.ajax() post method request parameter cannot be passed, request.getParameter() cannot get in the foreground page $.ajax({ url : "${ctx}/rediscluster/delete.do", data : {"rname":rname}, type : "post", dataType:"text", content-type: "application/json", success : function (data) { alert( ...


The difference between # and $ in Mybatis

... 1 # is the form of the incoming value as a string, eg:select id, name, age from student where id =#{id}, the current end has an id value of 1, When passed to the background, it is equivalent to select id, name, age from student where id = '1'. 2 $ is to directly display the incoming...


Mysql some common commands

... summarize some Mysql common commands record # Enter Mysql Cmd E: Cd phpnow\MySQL-5.0.90\bin Mysql -hlocalhost -uroot -proot #Query all databases Show databases; #Select database Use message; #Query data table Show tables; #Query all information in the data table Select * from gbooks; ...


MongoDB (warning) solution

... 目录 1, multi-core system resource allocation problem 2017-10-13T17:57:02.650+0800 I CONTROL [initandlisten] ** WARNING: You are running on a NUMA machine. Startup script can be written as follows: numactl --interleave=all /path/to/mongod --config /path/to/mongodb.conf 2, large memory...


Combine semantic and related aspect extraction optimization

... :lifelong learning aspect extraction work research :Improving Opinion Aspect Extraction Using Semantic Similarity and Aspect Associations using DP (dependency) grammar rules mining method, there is a lot of room for improvement, can not take both precision and recall Therefore, it is...


How to do the millions of large list reports in the second level?

... Data query business, sometimes encounter a large amount of inventory reports. Since the query conditions entered by the user may be very broad, hundreds of tens of millions or even billions of rows of records are detected from the database, including bank flow records, logistics details...


Empire cms channel cover page Get content based on column alias

... Prerequisites Set two column aliases, get the content of another column according to the column alias <div class="zhong_zj difot"> <h3>[!--bname--]Expert Team</h3> <ul> [e:loop={"select * from [!db.pre!]ecms_news where classid in (select classid from [!db.pre!...