Selecting data from mysql using qt?
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it is still as commented
[quote author="Antonio Di Monaco" date="1286818410"]Did you leave@
//bool ok = db.open();
@commented?[/quote]
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Try uncomment line 23
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i uncomment line 23 and comment everything below line 23 then it just says
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Starting /home/zafar/c++/dbExample-build-desktop/dbExample...
@and stucks there
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OH! You use SQL code before
a.exec()
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Are you sure?Create standart QT GUI application and wrote sql code in mainwindow module.
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i am new to qt. how can i create Qt Gui App and do you mean i should write sql code in mainwindow.h file?
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right now i have three files. db.h, db,cpp and main.cpp
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Run QT Creator.
Use menu File/new file or project.
Select QT Gui application.
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and select SQL checkbox
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and write sql code in MainWindow.cpp
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and see SQL Example please -
well i tried "File/new file or project and select qt gui app" but i ddint find any sql checkbox anywhere in creating new project
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no coments...
How can I send you screenshot? -
you can add pictures here as screenshots or if you want my email address i ll give you that as well for screenshots
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anyone who can help?
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!http://hin.dp.ua/files/down/qt_scr.PNG(my screenshot)!
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well i dont have that option. here is what i get
when i click file/new file or project then this screenshot
"Your text to link here...":http://www.freeimagehosting.net/uploads/702f633ae7.png
then i keep clicking next getting the follwoing screenshots
"Your text to link here...":http://www.freeimagehosting.net/uploads/ab872acfb8.png
"Your text to link here...":http://www.freeimagehosting.net/uploads/45c51ab364.png
"Your text to link here...":http://www.freeimagehosting.net/uploads/84605eae46.png
"Your text to link here...":http://www.freeimagehosting.net/uploads/84605eae46.png -
Well, it should make no problem to have SQL query before exec(), at least I don't have any problem with that.
Let's get back to square one:
You said if you uncomment the
@bool ok = db.open();@
then your program hangs. Can we see the value of 'ok'?
@qDebug() << ok;@
My guess is probably you have problems granting the rights in mysql when you've created the table... have you made
@GRANT ALL ON testTwo.* to 'root'at'localhost' IDENTIFIED BY 'somepassword';@
(Ouch please replace the 'at' with the 'at' sign, the forum motor uses it for code tags, I don't know how to write it... I hope it's not confusing.
I'm not sure if you can do it with empty password, I guess yes, but I never do that.) -
i now put password for root at localhost.
when i place qDebug() << ok then it displays this
@
false
QSqlQuery::exec: database not open
@false might be the value of ok.
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Are you able to connect to your DB from shell?
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i dont know how to connect to my DB from shell. I install xampp which is easy for me to manage my databases.
how can i connect from shell? -
@mysql -h host -D dbname -u user@
I guess your can omit host parameter if you are connecting to localhost. You might need to specify "-p password" switch also (depends on mysql configuration).
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i think i did not install any mysql client. bcause it displays this output
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root@zafar-laptop:/# mysql -h localhost -D testTwo -u root -p xxxxxx
The program 'mysql' can be found in the following packages:- mysql-client-core-5.1
- mysql-client-5.0
- mysql-cluster-client-5.1
Try: apt-get install <selected package>
@
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Run
@dpkg --list | grep mysql@
and post the output for this command.
