Qstring packagemanagercoreinstallerbinarypath const
Several drivers are supplied with Qt and other drivers can be added. The driver source code is supplied and can be used as a model for writing your own drivers. The table below lists the drivers included with Qt. Most installation programs also allow you to install "development libraries", and these are what you need. These libraries are responsible for the low-level communication with the DBMS. On Unix and Mac OS X, the Qt configure script tries to automatically detect the available client libraries on your machine.
Run configure -help to see what drivers can be built. You should get an output similar to this:. The configure script cannot detect the neccessary libraries and include files if they are not in the standard paths, so it may be necessary to specify these paths using the -I and -L command-line options. On Windows the -I parameter doesn't accept spaces in filenames, so use the 8. Look at the sections that follow for additional information about required libraries.
The MySQL embedded server is a drop-in replacement for the normal client library. You need the MySQL header files and as well as the shared library libmysqlclient. Depending on your Linux distribution you may need to install a package which is usually called "mysql-devel". You need to get the MySQL installation files.
EXE and choose "Custom Install". If you are not using a Microsoft compiler, replace nmake with make in the line above. After connecting to the Oracle server, the plugin will auto-detect the database version and enable features accordingly.
Usually, this means that the database server will use the user authentication provided by the operating system instead of its own authentication mechanism. Leave the username and password empty when opening a connection qstring packagemanagercoreinstallerbinarypath const QSqlDatabase to use the external credentials authentication. Build the plugin as follows here it is assumed that Oracle Client is installed in C: When you run your application you will also need to add the oci.
You should use native drivers in preference to the ODBC driver where they are available. ODBC support can be used as a fallback for compliant databases if no native drivers are available.
For Unix qstring packagemanagercoreinstallerbinarypath const there are some implementations which must be installed first. Some ODBC drivers claim to be version 2. The QODBC plugin therefore checks whether the data source can be used after a connection has been established and refuses to work if the check qstring packagemanagercoreinstallerbinarypath const. Do this at your own risk!
On Windows NT based systems, this is the default. It is recommended that you use unixODBC. You can find the latest version and ODBC drivers at http: You need the unixODBC header files and shared libraries. The ODBC header and include files should already be installed in the right directories. You just have to build the plugin as follows:. For more information about PostgreSQL visit http: Unicode is automatically used if the server supports it.
Note that the driver only supports the UTF-8 encoding. If your database uses any other qstring packagemanagercoreinstallerbinarypath const, the server must be compiled with Unicode conversion support. Unicode support was introduced in PostgreSQL version 7. Install the PostgreSQL developer libraries. Regardless of which library you use, the shared object file libsybdb. Set the SYBASE environment variable to point to the directory qstring packagemanagercoreinstallerbinarypath const you installed the client library and execute qmake:.
LIB to build the plugin:. The DB2 header and include files should already be qstring packagemanagercoreinstallerbinarypath const in the right directories. The Qt SQLite 2 qstring packagemanagercoreinstallerbinarypath const is offered for compatibility. Whenever possible, use the version 3 plugin instead. The build instructions for version 3 apply to version 2 as well. SQLite qstring packagemanagercoreinstallerbinarypath const an in-process database, which means that it is not necessary to have a database server.
SQLite operates on a single file, which must be set as the database name qstring packagemanagercoreinstallerbinarypath const opening a connection. If the file does not exist, SQLite will try to create it. SQLite also supports in-memory databases, simply pass ": SQLite has some restrictions regarding multiple users and multiple transactions.
SQLite has no support for types, every value is treated as character data. You can find information about SQLite on http: SQLite version 3 is included as a third-party library within Qt. It can be built by passing the following parameters to the configure script: SQLite minor releases sometimes break file format forward compatibility.
For example, SQLite 3. Please refer to the SQLite documentation and change logs for information about file format compatibility between versions. Patch qstring packagemanagercoreinstallerbinarypath const are therefore both backward and forward compatible. To force SQLite to use a specific file format, it is neccessary to build and ship your own database plugin with your own SQLite library as illustrated above.
The database file must exist before a connection can be established. Note that InterBase requires you to specify the full path to the database file, no matter whether it is stored locally or on another server. Please use Firebird or the free edition of InterBase. You should always use client qstring packagemanagercoreinstallerbinarypath const that have been compiled with the same compiler as you are using for your project.
If you cannot get a source distibution to qstring packagemanagercoreinstallerbinarypath const the client libraries yourself, you must make sure that the pre-compiled library is compatible with your compiler, otherwise you will get a lot of "undefined symbols" errors.
Some compilers have tools to convert libraries, e. If the compilation qstring packagemanagercoreinstallerbinarypath const a plugin succeeds but it cannot be loaded, make sure that the following requirements are met:. QSqlDatabase is responsible qstring packagemanagercoreinstallerbinarypath const loading and managing database qstring packagemanagercoreinstallerbinarypath const plugins. When qstring packagemanagercoreinstallerbinarypath const database is added see QSqlDatabase:: Qstring packagemanagercoreinstallerbinarypath const includes functions such as QSqlDriver:: QSqlDriver is responsible for connecting to a database, establish the proper environment, etc.
QSqlDatabase forwards many of its function calls directly to QSqlDriver which provides the concrete implementation. QSqlResult is responsible for sending queries to the database, returning result data, etc. QSqlQuery forwards many of its function calls directly to QSqlResult which provides the concrete implementation.
When implementing a Qt SQL driver, both of these classes must to be subclassed and the abstract virtual methods in each class must be implemented. Read How to Create Qt Plugins for more information on this.