1. When data.length=3, only 2 pieces of data are stored in the database, is it because the callback function is written wrong? function insertData (data) { var events = []; var count = 0; for (var i = 0; i < data.length; iPP) { ...
1. If the Description field in param is left empty, an error will be reported as shown in the figure . function insertData (data) { var values=[]; async.map(data,function(item,cb){ _getNewSN({ query:{category : "ProjectOID_&...
there is a table to store temperature information for displaying broken lines on the page. The structure is as follows CREATE TABLE `temp` ( `id` varchar(40) NOT NULL, `duuid` varchar(40) DEFAULT NULL, `temp` int(11) DEFAULT NULL, ...
problem description Design a purchase, sale and inventory system for a medium-sized multi-store seller; in order to improve sales opportunities and reduce the production of expired goods, items will be transferred back and forth among multiple stores...
1. How to insert the data from the values array into the database in bulk? The value obtained by values is: values= [[1Jing 2pje 1pcr 00pr 418223] and the length of the array is uncertain, so the length here is 2. Thank you for guidance! function ins...
recently, I want to process the form for analysis. Due to the lack of experience in dealing with sql or csv, I have encountered the following problems and asked to solve them: question 1: companyID fresh 23865 13-2 23866 10-3 23867 8-...
how to concatenate SQL statements to return data of type float when querying? ...
I have a dataset with a size of about 100000. The dataset is rarely added or updated, mainly because of frequent query operations, efficient query, and regardless of memory footprint and preload time. Which solution is better to use SQL or JSON+LINQ? ...
I have a dataset with a size of about 100000. The dataset is rarely added or updated, mainly because of frequent query operations, efficient query, and regardless of memory footprint and preload time. Which solution is better to use SQL or JSON+LINQ? ...
I have a dataset with a size of about 100000. The dataset is rarely added or updated, mainly because of frequent query operations, efficient query, and regardless of memory footprint and preload time. Which solution is better to use SQL or JSON+LINQ? ...
demand is roughly as above: if you have two tables, table order and table item in which table order can match the data of multiple tables item but some of the data in table item have prices that are zero and some are not zero now you need to output...
now I can only set apache, to restart every hour in cron, but this method treats the symptoms rather than the root of the problem. I am Ubuntu 16 + apache2 + php7.0 + mysql5.7 after running for a period of time, mysql hung up, and restart prompted in...
I now have two tables An and B, in which the primary key of table An is a foreign key in B. now I want to query the number of each primary key in A plus all the data in table A. how do you write this? ...
the following T-SQL update tablename set =e.,[00:00]=e.[00:00],[01:00]=e.[01:00],[02:00]=e.[02:00],[03:00]=e.[03:00],[04:00]=e.[04:00],[05:00]=e.[05:00],[06:00]=e.[06:00],[07:00]=e.[07:00],[08:00]=e.[08:00],[09:00]=e.[09:00],[10:00]=e.[10:00],[11:00]=e...
< H1 > MybatisPlus Custom Global Action exists always returns null < H1 > < H2 > scene < H2 > customizes a global operation for mybatis-plus , and then returns null all the time. when I was customizing the sql injector class, I suddenly found t...
there is an access data table with nearly 200000 pieces of data. I don t know when to modify it manually. The format of is as follows: there are fields in the Content table Chinese name: Xiao Li English name: xiaoli gender: male Chinese name: X...
it was fine before rebooting, but after rebooting, it will never be able to start again root@iZuf6acp86oa3jizjzwaqdZ:~-sharp service mysql start Job for mysql.service failed because the control process exited with error code. See "systemctl status...
when learning the database, I tapped at the code in the book, but it couldn t be implemented. I checked the source code and found no errors. as shown in the picture, this is the content of the book: : : : : this is the result even if you en...
there are two tables, one document table and one case table document (id,case_num,document_name) case (id,case_num,case_name,status) the case_num of the document table corresponds to the case_num of multiple case tables the case_num format of the ...
sources of topics and their own ideas related codes Please paste the code text below (do not replace the code with pictures) string cString = "data source=.;initial catalog=project;integrated security=true;"; SqlConnec...
how does the class module set readable and writable global variables ...
to do a project with weex, you need to share the page. When you open the content page, jump to the home page. For example, http: 192.168.1.122:8081 -sharp details 596, jump back to http: 192.168.1.122:8081 -sharp . What s going on? ask for the guida...
elementui multi-level header loops do not cycle in order the header order given by the background api is BCD, and then the second layer header is cycled sequentially, but the third layer header, when cycling, does not cycle in order tableHeader comp...
how to initialize mat2x4 in OpenGLES? ...
We need to make a Web-based reader, just like all the Web readers you use, such as turning pages left and right. however, we have a bizarre need to calculate the total length of all content, or to search. This requires the implementation of a "content...