# Proof of concept : read/write/subscription for DB Tag

**URL:** <https://forum.inductiveautomation.com/t/proof-of-concept-read-write-subscription-for-db-tag/3330>\
**Category:** Module Development\
**Created:** [September 24, 2011, 8:00am UTC](https://forum.inductiveautomation.com/t/proof-of-concept-read-write-subscription-for-db-tag/3330 "2011-09-24T08:00:05Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![mazeyrat](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/mazeyrat/32/10955_2.png) [@mazeyrat](https://forum.inductiveautomation.com/u/mazeyrat)\
**Post date:** [September 24, 2011, 8:00am UTC](https://forum.inductiveautomation.com/t/proof-of-concept-read-write-subscription-for-db-tag/3330/1 "2011-09-24T08:00:05Z")

</div>

I really need to quickly valide read/write/subscription of a standart DB Tag from a java module in order to validate the use of Ignition for my project.  
I need a proof of concept on this point.  
Except this sdk difficulty, all other features seems to me very powerfull and flexible compared to other legacy scada solutions.

I use :  
Sql Tag real time  
default Internal Provider Built-in SQLTags provider  
I create a string tag test2 under the default Provider?

I have an exception or a null value, but i can’t achive a good read (see other post)  
I try with the 7.2.9-beta5 (b197).  
I have to change my version : 7.2.8 ? or 7.3beta.  
I read they was problem with acces right in 7.2.8 (read(Arrays.asList(path),null,true); for examp

Do I check other point ? could you send me a java exmaple code to test :  
a read  
a write  
a subscrition  
with log

Best regards.

---

<div class="post-metadata">

**Author:** ![Colby.Clegg](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/colby.clegg/32/3282_2.png) [@Colby.Clegg](https://forum.inductiveautomation.com/u/Colby.Clegg)\
**Post date:** [September 26, 2011, 10:01pm UTC](https://forum.inductiveautomation.com/t/proof-of-concept-read-write-subscription-for-db-tag/3330/2 "2011-09-26T22:01:01Z")

</div>

Hi,

We’ll try to get the version stuff sorted out soon, and make the 7.3 sdk available (I don’t think it currently is). Until then, you should be able to use 7.2.9.

I suppose we could make an example that shows this, but I’m curious: why is this required for your project? What are you trying to accomplish exactly? I ask for a couple reasons, but mainly because there may be another way to do what you want. The SDK is powerful, but unfortunately it requires a pretty fair level of Java knowledge to really make progress, and we can’t offer a very high level of support for it (only on the forum, which obviously takes a long time to make progress). If I have an idea of what you need to do overall, and why you think the SDK is the best way to do it, I might be able to direct you better.

Regards,

---

<div class="post-metadata">

**Author:** ![Carl.Gould](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/carl.gould/32/7262_2.png) [@Carl.Gould](https://forum.inductiveautomation.com/u/Carl.Gould)\
**Post date:** [September 29, 2011, 5:17pm UTC](https://forum.inductiveautomation.com/t/proof-of-concept-read-write-subscription-for-db-tag/3330/3 "2011-09-29T17:17:54Z")

</div>

I put some basic examples on your other thread: [viewtopic.php?f=74&t=6930](http://inductiveautomation.com/forum/viewtopic.php?f=74&t=6930)