ucom | simple Serial-Port/TCP/UDP debugging tool | Wrapper library
kandi X-RAY | ucom Summary
kandi X-RAY | ucom Summary
A simple Serial-Port/TCP/UDP debugging tool. (simple and efficient serial port, TCP/UDP network debugging assistant)
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of ucom
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Trending Discussions on ucom
QUESTION
(Edit: I added examples below. I also added a public_ip to my tables as suggested in the comments)
(Just a disclaimer, I am still very new to web development. I especially know very little about MySQL in conjuction with PhP.)
I have a database table that contains a number records. For this example it contains records of DVDs. One of my php pages receives the ID of the DVD to be removed, and then proceeds to do so. ($chosenTable is a variable as I also have different tables for CDs, Vinyls and others - they all have the same columns)
...ANSWER
Answered 2020-Nov-28 at 20:37With respect, this business of renumbering your rows when you delete one is a really bad idea.
Why?
For one thing, the cost of doing this goes up the more rows you have. And the whole point of SQL is to allow you to handle vast tables efficiently.
For another thing, when you have multiple users doing this you get confusion. If one user is looking things up while another is deleting them, the first user will have the row numbers change under her. You can manage this with judicious use of database transactions, but they'll just block the second user until the first is done. This situation is often called a "race condition."
You mentioned you're new to MySql. Again with respect, I suggest you stick to the tried-and-true way of handling your ID numbers: auto-incrementing. When you delete a row from an auto incrementing table, the next row inserted does not re-use the deleted ID.
Everybody uses autoincremented ID values--from students to credit-card companies with unimaginably vast tables. I suggest you do the same, at least until you get a little more proficient with the technology.
Edit If you want to display your rows in the order you inserted them, simply do SELECT whatever FROM tbl ORDER BY id
where id
is the autoincrementing ID column. Gaps in the sequence of IDs due to deleted rows are not a problem.
If you have a particular ID value and you want the next row, in the order you inserted them, you can do
QUESTION
I'm trying to fill a table in a jsp with a List I put in the model from a Spring controller but the table is not being filled. This is the page:
...ANSWER
Answered 2020-Jul-26 at 09:38Try including the <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
athe top of your code. Also, make sure your object name ciudades
is spelled as it is in your controller.
QUESTION
This is my String and i have problems when splitting into string array with comma seperated values for keys
{ Yr = 2019, Mth = DECEMBER , SeqN = 0, UComment = tet,tet1, OComment = test,test1, FWkMth = WK, FSafety = Y, FCustConsign = Y, FNCNRPull = 0, FNCNRPush = 0, CreatedTime = 2020-01-03 06:16:53 }
when i try to use string.Split(',') i get "Ucomment = tet","tet1" as seperate array. But i need to have split string[] when seperated by comma
UComment = tet,tet1 OComment = test,test1
I have tried using the regex ,(?=([^\"]\"[^\"]\")[^\"]$)" but it didnot work.
...ANSWER
Answered 2020-Jan-03 at 07:04You may try matching on the regex pattern \S+\s*=\s*.*?(?=\s*,\s*\S+\s*=|\s*\}$)
:
QUESTION
I need to open and parse the following nested JSON file in R
...ANSWER
Answered 2017-Jan-23 at 10:50What you can do is the following:
QUESTION
I'm allocating an array of pointers that are dynamically allocated and I try to free them at the end of my program. The problem is that I always get a "invalid free()" error on valgrind, though I really couldn't find what is wrong. For an example: I'm allocating memory using malloc for argv[0] and argv1, and then try to free them in the for loop. I allocate the array of pointers using:
...ANSWER
Answered 2019-Dec-05 at 22:39There is more wrong than just what @FredLarson and I have already pointed out.
The function strsep()
actually modifies the pointer handed to it, so char *token = strsep(&str, " ")
; changes the pointer. Since str
was gotten from malloc
, it can't be freed properly.
If you want to call strsep()
on malloc'd memory, you have to save a copy of the original pointer and free it at the end.
Also, the not strictly portable but highly available function strdup()
is really helpful for making a copy of a string, so rather than allocate a bunch of memory and then copy a string to it, you can just strdup()
that string (and free it later).
QUESTION
It's a simple piece of ASP code. I shouldn't be having problems with it. Yet, here it is!
I have searched through Stack Overflow and can't find an answer. I have an SQL insert that keeps creating two records. I can't find a reason, rhythm nor rhyme to resolve this issue. What is causing me to have this duplicate record?
...ANSWER
Answered 2019-Jul-04 at 07:53You open your SQL statement with rs.open
and then you execute it with conn.execute
-> double insert There's no need to create a recordset for an insert, the conn.execute
is enough.
However, both methods rs.Open
and conn.Execute
are open to SQL Injection due to the way the SQL statement has been constructed. In this scenario, the best approach is to sanitise any input before passing directly into a SQL Statement and switch to using parameterised queries which use the ADODB.Command
object.
QUESTION
I am using DT::renderDT
in a shiny app and am formatting background color for certain columns and rows. I need the row background color to be on top of column background color. I tried switching order of formatStyle
but that didn't work. Here's a small example -
ANSWER
Answered 2019-Jun-08 at 14:09Here is a solution:
QUESTION
I'm a newbie in Perl and I'm trying to sort an array of XML elements from 6 similar XMLs. The code below has 2 of the 6 files as recommended. I've tried the sort function with substrings but it hasn't worked yet. Can anyone check and help me make it work?
...ANSWER
Answered 2018-Dec-06 at 15:43First, let's construct our list of prod elements:
QUESTION
here is what I want to do.
When I click the modify button, I wish div that contains role of 'ucomment' changes into in-line input form with its original value typed.
But I can't even start with selecting the div.
I thought the code here would work and could select what I aimed, but it didn't.
...ANSWER
Answered 2018-Jul-31 at 11:00This should find you the div
:
QUESTION
My question is, I have a JSON that returns me a list of objects. But sometimes this list returns me a single object in case the det.
I try to use the pattern below
...ANSWER
Answered 2018-Apr-04 at 14:07Decode the JSON as a slice if the first non-whitespace byte in the input is [
. Otherwise, decode the JSON as a struct.
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