Error c1083 QtSql

123456789

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mrjj

@123456789
If you use anything besides the SQLite db type you need to install its
client libs/dlls.
They are not included in Qt. only Sqlite is.
so if you are using MySql, you need its client Dlls installed.

123456789

i have use Sqlite
but I can not

mrjj

@123456789
Check again, if you have
QT += sql in .pro file
in the .pro file.
Else it dont know
#include <QtSql>

123456789

I have I have done
it's nothing
@mrjj

mrjj

@123456789
and you completely clean the build folder and rebuild all?

aha_1980

@123456789 and make sure no build artefacts are in the source folder. esp. Makefiles should only be in the build folder.

123456789

@aha_1980
http://prntscr.com/jx91h3

JonB

@123456789
You'd better just verify that the file named QtSql.h does indeed exist in your Qt installation area, just in case....

123456789

not result
[5_1529526202490_main.cpp](Uploading 100%) [4_1529526202490_login.ui](Uploading 100%) [3_1529526202490_login.h](Uploading 100%) [2_1529526202489_login.cpp](Uploading 100%) [1_1529526202489_ex3.pro.user](Uploading 100%) [0_1529526202488_ex3.pro](Uploading 100%)

mrjj

@123456789
The file upload is broken.
We cant see those.

but please paste the content of the pro file.

and also when time, try the working sample just to be sure its
not something in your Qt installation.
https://forum.qt.io/topic/91752/start-with-the-qtsql-module/15

123456789

@JonB
https://we.tl/SfZC5DpYxt

mrjj

@123456789
If you remove the
Qtdatabase: i;
from login.h
( class name wrong and syntax also)

The sample compiles fine.
For you it still complains about
#include <QtSql> ?

SGaist

Your code can't be compiled but it has nothing to do with the <QtSql> include.

You should first clean it.

Then, avoid using module wide includes. They are easy to use for quick samples or tests but otherwise they pull in everything the module contains which means that your compile time increases because the compiler will parse all the module includes. Basically: include what you use where you use it.

Then, please re-read the QSqlDatabase class documentation. You're going to make a wrong usage of it.

123456789

@mrjj
help me

jsulm

@123456789 Help with what?

mrjj

@123456789

Your code compiled fine for me.
i had to remove the
Qtdatabase: i;
from login.h
as its not needed and was also wrong syntax.
Should have been QSqlDatabase i;
But You dont need to keep the database around as doc says.

You really should study the Documentation as @SGaist says.

Without overall understanding of how the SQL system works, it will be hard
on you to do anything useful.

123456789

@mrjj
I just put this as an example.
but even if you remove this line of code it gives error