I need to link our C/C++ code that is using the DB2 ODBC driver on linux, and although ive pulled in sqlcli.h I dont know where to find the objects so i can link.
Ive installed DB2 v9.1 ESE so i wouldve thought i could get everything.
Anybody got any ideas?
Your application (on the client) would link to a Unix ODBC library -- either iODBC or unixodbc. Both are commonly available on Debian and Ubuntu and other distros.
Next, you install the ODBC driver from the server database. This means you need to get a DB2 ODBC driver onto your system.
With that, your application is capable of 'talking ODBC' and has someone to talk to: the ODBC driver of DB2.
To give another concrete example, I compile RODBC again unixodbc-dev for Debian and can then talk via ODBC to MySQL and Postgresql as I have drivers for both. [ This is of course contrived as both MySQL and Postgresql have native drivers too, but it servers as a test of RODBC. ]
Related
I'm new to the MongoDB. My virtual machine runs Ubuntu 14.04.5 with mongod, which is standard for this OS:
hekto#ubuntu:~$ mongod --version
db version v2.4.9
Tue Jun 5 18:00:23.923 git version: nogitversion
I've built a Mongo C++ Driver Ver 3.2.0 from sources and tried to write some tests. All of them output an exception below:
Server at localhost:27017 reports wire version 0, but this version of libmongoc requires at least 3 (MongoDB 3.0): generic server error
It looks like the C++ client and the server are incompatible.
Are there any tricks, which can be used with the Mongo C++ Driver to force it to work with older Mongo servers?
I can't convert the database itself to any new format for now, but also wouldn't like to learn the obsolete driver API.
MongoDB 2.4.9 has been end-of-life for quite some time: https://www.mongodb.com/support-policy, and most drivers have dropped support for talking to it.
If you are just starting with MongoDB, you should start with the newest available stable version, which is currently 3.6.5.
You can obtain packages for Ubuntu 14.04 according to the instructions here https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/
We have a Microsoft Sql 2014 database on a remote windows server. I am trying to develop a QT GUI app which connects to this database. The app is in Linux/c++ environment. I tried using QtSql APIs to connect to that database.
bool MainWindow::connect()
{
QSqlDatabase db=QSqlDatabase::addDatabase( "QODBC" );//I am not sure if I am calling this correctly
db.setHostName("III");
db.setDatabaseName("YYY");
db.setUserName("YYY");
db.setPassword("XX");
bool ok = db.open();
if(ok==true)
{
QSqlQuery query;
query.exec("SELECT * FROM Subjects");
while (query.next())
{
int phy = query.value(0).toInt();
int chem = query.value(1).toInt();
ui->lineEdit_2->setText(QString::number(phy));
ui->lineEdit_3->setText(QString::number(chem));
}
}
else
{
qDebug()<<db.lastError();
}
return ok;
}
Its giving me error as :
QSqlDatabase: QODBC driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QPSQL QPSQL7
QSqlError("", "Driver not loaded", "Driver not loaded")
I tried exporting the path of sql drivers to my Qt project.Still it didn't work.Then I read some articles and found that I need mssql-tools as well as ODBC Driver on my Linux box. I tried installing this based on this website:
https://blogs.msdn.microsoft.com/sqlnativeclient/2016/10/20/odbc-driver-13-0-for-linux-released/
and found that this won't work on my linux box (14.04 ubuntu) but only on 15.10 & 16.04.
The following packages have unmet dependencies:
mssql-tools :
Depends: libc6 (>= 2.21) but 2.19-0ubuntu6.9 is to be installed
Depends: libstdc++6 (>= 5.2) but 4.8.4-2ubuntu1~14.04.3 is to be installed
Depends: msodbcsql (>= 13.1.0.0) but it is not going to be installed
Depends: msodbcsql (< 13.2.0.0) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
Then I used docker from here:
https://hub.docker.com/r/taylorbarrick/mssql-server-linux-tools/
I could install it successfully but when I am running
$docker run -t taylorbarrick/mssql-server-linux-tools sqlcmd -d <dbname> -H <host> -U <username> -P <password>
I am getting errors again.
Sqlcmd: Error: Microsoft ODBC Driver 13 for SQL Server : Login timeout expired.
Sqlcmd: Error: Microsoft ODBC Driver 13 for SQL Server : TCP Provider: Error code 0x2749.
Sqlcmd: Error: Microsoft ODBC Driver 13 for SQL Server : A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow remote connections. For more information see SQL Server Books Online..
However,when using visual interface I can connect to sql database.Please help.
Doing what you want is definitely possible but slightly tricky. Here is my short guide for that (personally, I solved this quest with help of unixodbc and freetds. They works fine, although, msodbc could be used too, the general idea will be same).
Firstly, the errors you got (QSqlDatabase: QODBC driver not loaded) means that you don't have Qt's ODBC driver. So you have to build it from Qt sources. Run MaintenanceTool to make sure that sources for your version of Qt are installed within Qt's directory. Then read carefully documentation about building SQL drivers and details of usage ODBC. The batch you need is following:
cd $QTDIR/qtbase/src/plugins/sqldrivers/odbc
qmake "INCLUDEPATH+=/usr/local/unixODBC/include" "LIBS+=-L/usr/local/unixODBC/lib -lodbc"
make
Secondly, in GNU/Linux environment you need unixodbc, tdsodbc, freetds-bin packages (the names for Debian Jessie, they may be different in your particular distribution). I also recommend you to read MANs from these packages. Freetds driver must be "installed" into unixodbc. Following command will do the job (again, in Debian Jessie):
odbcinst -i -d -f /usr/share/tdsodbc/odbcinst.ini
Next, you should supply correct connection string to QSqlDatabase instance (via the QSqlDatabase::setDatabaseName call). Also, make sure that the type of database is QODBC (you code is correct at this point). You can't pass usernames, password and etc via regular calls of QSqlDatabase (i.e. QSqlDatabase::setDatabaseName, QSqlDatabase::setPassword and etc won't work). They must be included into connection string which should looks something like that:
DRIVER={freetds};SERVER=192.168.55.55;PORT=1433;DATABASE=YYY;UID=YYY;PWD=XX
Obviously, you should put correct IP or host name and other parameters. Also, freetds must replaced with correct driver name (it stored within the unixodbc configuration file). There is a handy site which generates connection string. Also there is a reference for connection string format at MSDN.
Finally, MS SQL Server and instance of you DB must be properly configured. Make sure that MS SQL Server accepts TCP connections and bound to correct ports (and addresses!). Also, you should set correct "Authentication Mode" for both SQL Server and instance of DB: it is "Windows Authentication only" by default but to connect via freetds it must allow "SQL Server Authentication".
Probably something else need to be tweaked. Read docs and logs carefully.
Added: I've just read about driver supplied by MS. The overall process is same, but instead freetds you should use this MS driver (i.e. "install" it into unxiodbc via odbcinst or manually into config and put correct driver name and other parameters into connection string). Anyway, Qt driver for ODBC wraps around unixodbc, so, it cannot be avoided.
To use MSSql server, you may have to install Microsoft's version of ODBC (msodbc) rather than unixodbc because... Microsoft. You can download it at https://www.microsoft.com/en-us/sql-server/sql-server-vnext-including-Linux.
Once you have that, you can access MSSql databases via ODBC. It is buggy and Whenever it updates, it may fail so you have to remove and reinstall both the library and the dev package.
Hello everyone I have mysql on my computer I installed it and installed the service successfully, I do some database using mysql now
the only question: can I run my c++ application that uses mysql databases on a computer where mysql is not installed??
my os is windows 7 x64;
any help is highly appreciated thank you for answering even after voting down.
I searched too much but in vain.
I have made an application in c++. This application is connected to a MySQL database (it uses the mysql c++ connector).
When I run the app in my computer with a local database, everything is ok. But when I run it in my server (centos) with its own database, it returns a sqlException with the message: "The connection is in autoCommit mode".
After that, I cant execute any query.
Somebody knows what is happening? Thanks
EDIT:
The code I have used to connect with the database
driver = sql::mysql::get_driver_instance();
con = driver->connect(host,user,pass);
con->setSchema(bd);
host is the database-host (tcp://IP:PORT)
user is the database-user
pass is the database-pass
bd is the database-name
I faced the exact same issue when I was running it on ubuntu 12.04 and I was linking against libraries downloaded from dev.mysql.com for 12.04 but it got resolved when I instead linked it against libraries for 14.04. I am facing the same issue on RHEL6 for both the RHEL5 and RHEL6 libraries. Maybe you should try installing CentOS7 libraries.
I'm a newbie at c++ linking and databases, so may be i'm asking a really stupid question. Anyway, i'm trying to access to firebird database using Qt5 for Windows. I've checked google and found 2 ways of doing so:
build ibase driver from Qt source;
use firebird through ODBC driver.
Software versions
I'm using latest version of Qt: 5.1.1. Firebird 2.5 is working ok: i've create a test_base and test user admin. Administartion of test_base i've done through FlameRobin.
Building
I've downloaded qt5.1.1 source and unpacked it in c:/devtools/qt5.1.1-src. Since Qt4.7-4.8 folder and project structure has been changed so old FAQs cannot be applied here. So i tried to build sql.pro from qtbase\src\sql folder with 2 lines added:
INCLUDEPATH+= C:/devtools/firebird/firebird_2_5/include
LIBS+= C:/devtools/firebird/firebird_2_5/lib/fbclient_ms.lib
And i've added C:/devtools/firebird/firebird_2_5/lib/ and C:/devtools/firebird/firebird_2_5/include in system PATH. Compilation is done without any error and i get a qt_pch.h.gch\c++ file in build dir. And i have no idea what's to do next, because i hoped to have bunch of .a and .dll files or bunch of error at least.
Using ODBC driver
I've downloaded and installed firebird ODBC driver from here. Installation was successful and i created ODBC DSN source mydb in Windows ODBC manager. Test connection button from ODBC configurator says that everything is ok.
Next thing i did was opening SQL Browser example from Qt Creator. And it fails to open my ODBC base with following parameters:
Driver: QODBC
Database Name: mydb
Username: admin
Password: admin
Hostname: localhost
Port: Default
And i get an error message: "[ODBC Firebird Driver] Unable to connect to data source: library 'C:\devtools\Firebird\Firebird_2_5\bin\fbclient.dll' failed to load QODBC3: Unable to connect".
I'm looking for resolving any of this two issues. Thanks in advance.
upd: i've connected firebird database through ODBC: the error was in using x64 database with x86 QODBC. Nota bene: in order to manage x86 DSN ODBC in x64 Windows 7 one must run ODBC manager from %WINDIR%\SysWOW64\odbcad32.exe NOT from Administration Panel as it explained here.
But what about building ibase from qt source?