Among the features announced with the release of version 4.6 of the KDE Software Compilation is KateSQL, a SQL Query plugin for the Kate text editor providing the basic functionality of a SQL client. It leverages the Qt SQL module, allowing you to make a connection to most types of databases. Out of the box it includes support for MySQL and SQLite, and with this post I’ll show you how to get it to connect to Oracle databases as well.
Since I am an Ubuntu user (Note: you’ll need to be on 11.04 and either be running Kubuntu or have the ‘kate’ package installed) these instructions will be specific to that operating system, though they will likely also apply to other Debian-based distributions with minimal modification. However, if you are using an RPM-based distribution such as openSUSE or Fedora, you’ll need to adapt the instructions somewhat to make sure you have the necessary development packages installed.
The first thing we’ll need to do in order to get this to work is to obtain an Oracle client. This can be downloaded from the Oracle Technology Network and requires that you have a valid Oracle.com Single Sign-On account. For the purposes of this article we’re going to use the Linux x86 Oracle Instant Client and the files we’re going to download are:
The first package is the client itself, providing the files required to run OCI applications. The second is the Instant Client SDK which includes header files for developing Oracle applications with Instant Client: in our case an OCI library for the Qt SQL module.
Users of RPM-based distributions can just go ahead and install these packages while others will need to convert them to .deb format first. The best way to do this that I am aware of is with the tool called Alien. Let’s install it, convert the Oracle Instant Client packages, and install them too.
cd /path/to/oracle/instant/client/files sudo apt-get install alien sudo alien oracle-instantclient11.2-basic-188.8.131.52.0.i386.rpm sudo alien oracle-instantclient11.2-devel-184.108.40.206.0.i386.rpm sudo dpkg -i oracle-instantclient11.2-basic_220.127.116.11.0-2_i386.deb oracle-instantclient11.2-devel_18.104.22.168.0-2_i386.deb
The next step is to install all of the dependencies necessary to build the Qt SQL OCI library.
sudo apt-get build-dep qt4-x11 sudo apt-get install qt4-qmake libqt4-dev libaio1
Then we will need the actual source code for the qt4-x11 package. This can be obtained with the following command:
apt-get source qt4-x11
To recap, at this point we’ve downloaded and installed the Oracle Instant Client and all of the dependencies required to build the qt4-x11 package, and we’ve downloaded the qt4-x11 source code. Next we’re going to build the Qt SQL OCI library itself.
sudo ln -s /path/to/qt4-x11-4.7.0/src /usr/include/src sudo cp -r /path/to/qt4-x11-4.7.0/include/QtSql/private /usr/include/qt4/QtSql/ cd /usr/include/src/plugins/sqldrivers/oci/ qmake "INCLUDEPATH+=/usr/include/oracle/11.2/client64" "LIBS+=-L/usr/lib/oracle/11.2/client64/lib -Wl,-rpath,/usr/lib/oracle/11.2/client64/lib -lclntsh -lnnz11" oci.pro make sudo make install
Now that the libqsqloci.so module has been built and installed, Kate should be able to connect to an Oracle database. Launch Kate (or close and re-open it if it was already running), click Settings -> Configure Kate, expand the Application tree if necessary, click Plugins, check ‘SQL Plugin‘ and click OK. Then click SQL -> Add connection to launch the connection wizard. In addition to the MySQL and SQLite database drivers, you should now also have drivers named QOCI and QOCI8 available. Choose the appropriate one, enter relevant connection details, and complete the connection wizard. You can now execute queries against the database and display result data.