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Caveat - I have never used EF.
Code first always seems like a recipe for disaster to me and the thought of multiple developers managing your data structure just curls my toes in horror. Having seen what some senior developers can do to a normalised database I'd hate to see what a junior dev could do.
Never underestimate the power of human stupidity
RAH
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Mycroft Holmes wrote: Code first always seems like a recipe for disaster to me
I have used EF but never code first way. I don't like when the power is taken away from me. SQL scripts are powerful addiction you see. 
"It is easy to decipher extraterrestrial signals after deciphering Javascript and VB6 themselves.", ISanti[ ^]
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The day I think EF can write a better query or create a data structure better than I can I will quit, oh wait I have retired 
Old dogs and all that, I cut my teeth on TSQL and will never abdicate that job although I am uncomfortable with CTEs.
Never underestimate the power of human stupidity
RAH
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Mycroft Holmes wrote: your data structure just curls my toes in horror
Unless you get paid based on billable hours. Then it is gleeful laughter all the way to the bank.
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lw@zi wrote: IMO, we start with an empty database and then keep on adding the tables/procedures as needed by that sprint
That is the claim.
Think about do you want to live in a house where first they built the door, then the living room, then the kitchen, but first they needed to move the door because the kitchen made that door impossible...
Not to mention of course in the above I mentioned nothing about electricity nor plumbing.
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That is where a very well thought sprint plan comes in. One must spend a really good amount of time modularizing (yes, that is a word from now on) the application, understanding dependencies and then planning the sprint so we do not end up in situations like:
Oh I can't add this new not null column to table anymore unless I set a default value. But there is no default value. Plus I can simply recreate this single table because 20 other tables and my in-laws don't approve of it.
Still, there is a good chance of getting into troubles. Fortunately this is not for me to decide (sprint planning, that is).
"It is easy to decipher extraterrestrial signals after deciphering Javascript and VB6 themselves.", ISanti[ ^]
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lw@zi wrote: That is where a very well thought sprint plan comes in
Yes the process that goes on before one starts sprints at all. And at a minimum there should be quite a few data model entities and primary attributes defined by that.
And real sizing also. Better know if you are going to have 10 users or 20 million users, and 10 TPS or 1 million TPS before you start your first 2 week sprint with an empty database.
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Why don't you just have a "sprint", where y'all get together, and "design the database"?
Agile doesn't mean haphazard.
The idea that you can then "share" the model (while maintaining control) seems to be lost.
"Code first" means the "entities" are (initialy) "defined" via "code"; instead of "DDL first"; the result is still "SQL".
"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal
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lw@zi wrote: IMO, we start with an empty database and then keep on adding the tables/procedures as needed by that sprint. We do not design entire database upfront.
Most people think that, even if they don't "agile". That's the reason why many relational databases aren't normalized and contain inconsistencies.
It is a bad excuse for being lazy 
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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<pre>$sql = "SELECT `name`, `email`, `comment` FROM `blog1`";
$result = $conn->query( $sql );
$count = 0;
$images = array("user1.jpg", "user2.jpg", "user3.jpg");
if( $result->num_rows > 0 ) {
while( $row = $result->fetch_assoc() ) {
echo '
<div class="comment-block">
'.( !empty( $images[$count] ) ? '<img src="images/blog/'.$images[$count].'">' : '').' <!-- Add the count to the images to use it as a key, add check to see if count is a key -->
'.$row['name'].'
'.$row['comment'].'
</div>
';
$count++; you want
if( $count == 3 )
{
$count = 0;
}
}
}
<pre><pre lang="PHP">
.
I tried to figure by my self but it wont work,like put images in div echo '
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This forum is intended for questions about application architecture and design, not questions about web development. You should post your question in the web development forum.
This space for rent
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can anybody move question in right place i am not familliar how to do it.
helpppp me
modified 16-Aug-18 15:06pm.
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Post in this[^] forum.
This space for rent
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What language is "helpppp" and what does it mean?
Sorry to be pedantic, but you will get more people not just willing, but able to help, if you stick to standard English ... txt spk makes you look childish, but seriously there are members here whose first language is not English, they are going to struggle to understand the "ppp" or the "plzzzz" etc. Keep your questions open to the widest possible audience. Help us to help you 
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I have used several "how to" tutorials / instructions and still cannot figure out "who is on first" when it comes to activating wireless connection - IN GENERAL
I can do " ifconfig" , "wpa_supplicant.conf " etc.
I did use wicd and could not make the connection.
What I am missing is - <b>how does Linux starts / makes wireless connection in general.</b> . In what sequence and which files are involved.
PS I have SSH working and it was much easier to install / activate/ test.
Any pointers would be appreciated.
Please no references to RPi tutorial(s) needed, been there, done that,
Thanks
Vaclav
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Wireless is the same as wired, it is just a network connection. The decision of 'who is on first' is decided by the systems that are connected to the network. Servers listen, and clients call. But servers can also be clients, and clients can be servers. Just the same as the telephone.
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There's a couple of different ways to do this:
If you want to optimize you will need to manually configure the connection in the /etc/wpa_supplicant/<name>.conf file. Assuming that your distro is also relatively modern (i.e. uses systemd rather than sysvinit) you should also have systemd-networkd available, which is simple to configure.
When checking into Linux items, my general go-to is the ArchWiki. It's comprehensive, generally presents multiple use cases, and is pretty no-nonsense:
WPA supplicant - ArchWiki
systemd-networkd - ArchWiki
If you want to make your life a bit easier and add some flexibility, you can install NetworkManager:
NetworkManager - ArchWiki
"Never attribute to malice that which can be explained by stupidity."
- Hanlon's Razor
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Thanks for reply.
I have been busy trying to find stable OS which actually does WiFi.
What I really need is to know how the whole communication process starts.
During my research I found this gem "wpa_supplicant is build by OS , copied to /etc/... and deleted..." When I try to simply implement "standard" WiFi I actually received "Wpa_supplicant does not exist ". Not much help there.
That is why I ask "who is on first"
Actually I like to use "bonding" so I do not have to worry which type of network I'll am using.
But I really need to hit the books first.
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Yeah, all Linux distros, AFAIK, use iw and wpa_supplicant to implement wifi over WPA. Generally both will be embedded in the installer software, but not the core distribution. It (they) just needs to be installed like any other package while bootstrapping the install.
"Never attribute to malice that which can be explained by stupidity."
- Hanlon's Razor
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You are correct, however in case of both Raspian Desktop and Ubuntu MATE OS one is lead to believe that "raspi-config" does the (WiFi) activation. AS you pointed out - unfortunately one cannot activate something which is not properly or not at all installed in the first place.
I need to find a REAL controller hardware "computer". I am getting frustrated with these OS for toys which are good for flashing LED at best.
Of course when I say something to that effect I get kicked out from forum.
Cheers
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Been there and experienced many show stopping issues.
Is I pointed out - one has to read the mail to see there are few "gotcha" which points to so far unsolved basic problems with latest release of Ubuntu WiFi.
The "problem" is , IMHO, nobody addresses the basic (WiFi) issue and people post hacks to solve THEIR issue only.
"solutions " like "remove battery and reinstall it" , reboot , reinstall etc do not solve this.
I can do
pi@pi $ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.1.38 netmask 255.255.255.0 broadcast 10.0.1.255
inet6 fe80::db20:1d69:504c:9820 prefixlen 64 scopeid 0x20<link>
ether b8:27:eb:bb:95:28 txqueuelen 1000 (Ethernet)
RX packets 581 bytes 148393 (144.9 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 290 bytes 54470 (53.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 38 bytes 1962 (1.9 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 38 bytes 1962 (1.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.42.0.1 netmask 255.255.255.0 broadcast 10.42.0.255
inet6 fe80::ba27:ebff:feee:c07d prefixlen 64 scopeid 0x20<link>
ether b8:27:eb:ee:c0:7d txqueuelen 1000 (Ethernet)
RX packets 176 bytes 16942 (16.5 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 420 bytes 95606 (93.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
My "problem " is - I have TWO wlan interfaces - RPI and Belkin.
So I unplug the belkin and plug it back
Here is ifconfig AFTER
pi@pi $ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.1.38 netmask 255.255.255.0 broadcast 10.0.1.255
inet6 fe80::db20:1d69:504c:9820 prefixlen 64 scopeid 0x20<link>
ether b8:27:eb:bb:95:28 txqueuelen 1000 (Ethernet)
RX packets 842 bytes 167321 (163.3 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 455 bytes 86115 (84.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 245 bytes 27113 (26.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 245 bytes 27113 (26.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.42.0.1 netmask 255.255.255.0 broadcast 10.42.0.255
inet6 fe80::ba27:ebff:feee:c07d prefixlen 64 scopeid 0x20<link>
ether b8:27:eb:ee:c0:7d txqueuelen 1000 (Ethernet)
RX packets 227 bytes 19690 (19.2 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 523 bytes 120456 (117.6 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlan1: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether b4:75:0e:7a:72:27 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
pi@pi $
See "the issue " ?
Why did the OS missed the USB Wifi on first ifconfig?
Or did it missed RPi interface?
And this is just one example of how this goofy WiFi behavior is being "troubleshooted " by unsubstantiated suggestions - "try this...".
Sorry for the long vent.
Cheers Vaclav
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Vaclav_ wrote: Sorry for the long vent.
We've all needed to do that occasionally.
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Hi,
Vaclav_ wrote: Sorry for the long vent.
For what it's worth... I completely understand your frustration. I have many hobby boards including several RPI, Qualcomm Dragonboard and a few Allwinner based boards. It seems like I am always hacking something together when I am working with my Linux-based IoT hobby projects.
Vaclav_ wrote: Why did the OS missed the USB Wifi on first ifconfig?
Or did it missed RPi interface?
When I did an OUI lookup on your MAC address it looks like the raspberry pi ethernet is the only interface available in your first ifconfig.
It sounds like a timing issue which is one of the most common problems I seem to face on these boards.
If I were debugging this I would first make sure that the USB device is present after booting the board:
lsusb
If the USB device is listed then you probably have a timing issue where the device is not ready when your network comes up. The easiest 'hack' to fix this would be a simple network restart at the end of your init script:
/etc/init.d/networking restart
I actually have this 'hack' on two of my Allwinner based boards and both of them have a USB wifi/ethernet.
I am not a Linux guru so don't listen to me. There are probably other ways to fix USB timing issues on Linux.
Best Wishes,
-David Delaune
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David, thanks for the "sympathy card".
I have switched to Linux about three / four years ago - just because.
I went thru hell for few months trying to figure out why my USB devices were just coming and going. My solution - get rid of my switched POWERED USB hub connected between two devices - PC and RPi. It is hard to believe , but the problem was and still is TWO 6 feet long USB cables connected to the switch! Any cables - it is the length and as you pointed out - the timing.
After realizing the doggy OS RPi operates with I decided to do cross-compiling...
Learn ssh and now looking at WiFi.
I do not mind learning and pasting things together IF they work as "advertised".
This WiFi is such incomplete kluge I should get my money back from the "charitable corporation ".
Yes, I am rebuilding the configuration files to make sure the booting process actually checks the presence of devices , USB included, and all the files to make WiFi fly - not just posting meaningless errors.
So - I am learning how to write bash scripts!
And I though I left "bat" files somewhere in Oregon 30 some odd years back.
Cheers and good night
Vaclav
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