MATLAB Answers

Not successful connection to MySQL (native data source configuration)

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Mohammad Alavirad
Mohammad Alavirad on 27 Aug 2021
Commented: Walter Roberson on 20 Sep 2021
Hi folks
I am trying to querry data from a native source SQL using Database Explorer as below:
The parameters are set properly (this is verified using a Python API before)
When I test this connection, it takes forever and no response received. Looks like connection is not successful.
Any input is much appreciated.

Answers (3)

Kojiro Saito
Kojiro Saito on 30 Aug 2021
As written in this document, please make sure that you have installed MySQL Connector/C++ 8.0.15 driver.
The native driver installer is linked from here.
---
MySQL Native Interface
You need to install the appropriate driver for your operating system. For the Windows® and macOS operating systems, use this link to download and install the driver. For Linux®, use this link.
---
Also, please make sure that you've added the path of driver libraries (by default in Windows, the path would be C:\Program Files\MySQL\Connector C++ 8.0\lib64).
setenv('PATH', [getenv('PATH') ';C:\Program Files\MySQL\Connector C++ 8.0\lib64']);
Or, add "C:\Program Files\MySQL\Connector C++ 8.0\lib64" to Windows System Path.
After that, I think you can avoid hang-up.
  3 Comments
Kojiro Saito
Kojiro Saito on 31 Aug 2021
OK, so the connector setting looks good to me.
It's simliar to this issue.
How about deleting preference directory?
prefdir
will return MATLAB's preference directory.
(ex, C:\Users\USENAME\AppData\Roaming\MathWorks\MATLAB\R2021a)
Deleting this preference directory and relaunching MATLAB might solve this issue.
If not, you had better re-install MATLAB.

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Mohammad Alavirad
Mohammad Alavirad on 30 Aug 2021
Edited: Mohammad Alavirad on 30 Aug 2021
Thank you @Kojiro Saito for your message. I followed your instructions and this time and tested the connection in two ways:
1) I used Database Explorer App and got this error in Matlab Command Window (at least I saw something!!), the Test window still hanging up though...
Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 410)
Error while evaluating Button PrivateButtonPushedFcn.
___________________________________________
2) I also used the script to test my connection to SQL database and recieved this error message:
Loading C:\Program Files\MATLAB\R2021a\bin\win64\builtins\database_builtins\mwlibmysql_builtinimpl.dllfailed with error: The specified module could not be found.
: not connected: not connected
I checked the directory and the *.dll is there:
___________________________________________
Any advise would be greatly appreciated.

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