Solved Building QT with "windeployqt": not connect to database (ODBC)
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Hello, and sorry for my not perfect English.
I developed a simple UI application with QT, connected to a local database (using XAMPP). I downloaded the ODBC connector (https://dev.mysql.com/downloads/connector/odbc) and configured the connection to the database through ODBC Data Sources. In the main I connect to the database and everything works correctly.
Then I generated the executable of my project and related dependencies using the windeployqt command from terminal. I put all in the same folder and the executable works perfectly.
Then I moved everything (exe + dependencies) to another PC (with the same database locally and xampp running), but here the connection to the database fails.
How can I solve it? Thanks!
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Hi and welcome to devnet,
Did you check that you also deployed the connector's dll and its dependencies along with your application ?
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That's all! Into sqldrivers there is qsqlodbc.dll
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Use a tool like Dependency Walker to find the direct dependencies you need to deploy.
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Mmh this is the output:
How can recognize and integrate the direct dependencies?
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This is for your application executable, you should check the database plugin.
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Mmh so I don't have to open my exe in dependency walker?
Sorry and thank you for your patience... -
C:\Qt\5.14.2\mingw73_32\plugins\sqldrivers\qsqlodbc.dll
I have to run dependency walker on it, right? -
Eventually, this is the output:
These are already present:
- LIBGCC_S_DW2-1.DLL
- LIBSTDC++-6.DLL
- QT5CORE.DLL
- QT5SQL.DLL
I downloaded the other 3 [https://www.dll-files.com/search.dll.html], and added these in the same folder.
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And the ODBC dll ?
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ODBC32.dll, no?
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Yes, did you check the dependencies of that one ?
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Download and put inside all the missing dll?
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Unfortunately the problem persists
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Hi, just guessing, are you using 127.0.0.1 (or localhost) to connect to the database also on the new PC? Also, have you checked that you can reach the database with MySQL workbench?
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Yes to both
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Ok. Is it same version of Windows 10 on both computers?
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Is the ODCB connection created on 2nd computer? Also with mysql connector you need Visual C++2015 distro.
--James
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@hskoglund Yes
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@JSher No, I just tried to print the error on a label with db.lastError() and the output is: "[Microsoft][Driver Manager ODBC] Nome origine dati non trovato e driver predefinito non specificato. QODBC3: Unable to connect"
