Thank you for your discussion of this issue. I can report that it still is extant in Qt 5. Environment appears to work, but actually does not. This is cruelly deceptive! Because, by "really doesn't work" I mean that the PATH as actually prepared for use when launching your Qt-dependent application from within VStudio doesn't see this macro. Your application will launch correctly.
And if you examine your PATH from within your program using e. The solution described above rearranging the elements in It took many seconds to re-initialize the projects and even then I don't believe the. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?
Collectives on Stack Overflow. Learn more. Asked 6 years, 10 months ago. Active 5 months ago. Viewed 9k times. This is a known bug with Qt-Add-in See: bugreports. PostgreSQL databases will only respect case sensitivity if the table or field name is quoted when the table is created.
So for example, a SQL query such as:. If the table or field name is not quoted when created, the actual table name or field name will be lower-case. When QSqlDatabase::record or QSqlDatabase::primaryIndex access a table or field that was unquoted when created, the name passed to the function must be lower-case to ensure it is found. If the plugin is built with an older version, then forward-only mode will not be available - calling QSqlQuery::setForwardOnly with true will have no effect.
While navigating the results in forward-only mode, the handle of QSqlResult may change. Applications that use the low-level handle of SQL result must get a new handle after each call to any of QSqlResult fetch functions. While reading the results of a forward-only query with PostgreSQL, the database connection cannot be used to execute other queries. This is a limitation of libpq library. This problem will not occur if query1 and query2 use different database connections, or if we execute query2 after the while loop.
Note: Some methods of QSqlDatabase like tables , primaryIndex implicity execute SQL queries, so these also cannot be used while navigating the results of forward-only query.
Install the appropriate PostgreSQL developer libraries for your compiler. When you distribute your application, remember to include libpq. QTDS is obsolete from Qt 4. It is not possible to set the port with QSqlDatabase::setPort due to limitations in the Sybase client library. Refer to the Sybase documentation for information on how to set up a Sybase client configuration file to enable connections to databases on non-default ports. Regardless of which library you use, the shared object file libsybdb.
Set the SYBASE environment variable to point to the directory where you installed the client library and execute qmake :. LIB to build the plugin:. By default, the Microsoft library is used on Windows. The DB2 header and include files should already be installed in the right directories. The Qt SQLite 2 plugin 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 is 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 when opening a connection. If the file does not exist, SQLite will try to create it. SQLite also supports in-memory and temporary databases. Simply pass respectively ":memory:" or an empty string as the database name.
SQLite has some restrictions regarding multiple users and multiple transactions. This is due to SQLite associating the type of a value with the value itself rather than with the column it is stored in.
A consequence of this is that the type returned by QSqlField::type only indicates the field's recommended type. No assumption of the actual type should be made from this and the type of the individual values should be checked. The driver is locked for updates while a select is executed. SQLite version 3 is included as a third-party library within Qt.
It can be built by passing the -qt-sqlite parameter to the configure script. If you do not want to use the SQLite library included with Qt, you can pass -system-sqlite to the configure script to use the SQLite libraries of the operating system.
This is recommended whenever possible, as it reduces the installation size and removes one component for which you need to track security advisories.
However the needed implementation must be provided by the user. For better performance the regular expressions are cached internally. By default the cache size is 25, but it can be changed through the option's value. SQLite minor releases sometimes break file format forward compatibility. For example, SQLite 3. If it is already absolute nothing happens. Returns true if the conversion succeeded; otherwise returns false. Returns true if the fileName matches the wildcard glob pattern filter ; otherwise returns false.
The filter may contain multiple patterns separated by spaces or semicolons. The matching is case insensitive. Returns true if the fileName matches any of the wildcard glob patterns in the list of filters ; otherwise returns false.
Returns the path. This may contain symbolic links, but never contains redundant ". The returned path can be either absolute or relative see setPath. See also absoluteFilePath , filePath , and canonicalPath. Returns true if the file is removed successfully; otherwise returns false. If a file or directory cannot be removed, removeRecursively keeps going and attempts to delete as many files and sub-directories as possible, then returns false.
If the directory was already removed, the method returns true expected result already reached. Note: this function is meant for removing a small application-internal directory such as a temporary directory , but not user-visible directories.
For user-visible operations, it is rather recommended to report errors more precisely to the user, to offer solutions in case of errors, to show progress during the deletion since it could take several minutes, etc. Renames a file or directory from oldName to newName , and returns true if successful; otherwise returns false. On most file systems, rename fails only if oldName does not exist, or if a file with the new name already exists.
However, there are also other reasons why rename can fail. For example, on at least one file system rename fails if newName points to an open file.
If oldName is a file not a directory that can't be renamed right away, Qt will try to copy oldName to newName and remove oldName. The function will remove all parent directories in dirPath , provided that they are empty. This is the opposite of mkpath dirPath.
The directory is constructed using the absolute path of the root directory, ensuring that its path will be the same as its absolutePath. See also drives , current , home , and temp. See also root , drives , currentPath , homePath , and tempPath. See also setSearchPaths and addSearchPath.
You do not need to use this function to build file paths. If you want to display paths to the user using their operating system's separator use toNativeSeparators.
Sets the application's current working directory to path. Returns true if the directory was successfully changed; otherwise returns false. See also current , currentPath , home , root , and temp. Sets the filter used by entryList and entryInfoList to filters. The filter is used to specify the kind of files that should be returned by entryList and entryInfoList. See QDir::Filter.
See also filter and setNameFilters. Sets the name filters used by entryList and entryInfoList to the list of filters specified by nameFilters. See also nameFilters and setFilter. Sets the path of the directory to path. The path is cleaned of redundant ". No check is made to see whether a directory with this path actually exists; but you can check for yourself using exists.
The path can be either absolute or relative. Sets or replaces Qt's search paths for file names with the prefix prefix to searchPaths. To specify a prefix for a file name, prepend the prefix followed by a single colon e. Qt uses this search path to locate files with a known prefix. The search path entries are tested in order, starting with the first entry.
File name prefix must be at least 2 characters long to avoid conflicts with Windows drive letters. Sets the sort order used by entryList and entryInfoList.
See also sorting and SortFlag. See also setSorting and SortFlag. Swaps this QDir instance with other. This function is very fast and never fails. The directory is constructed using the absolute canonical path of the temporary directory, ensuring that its path will be the same as its absolutePath. See also drives , current , home , and root. The path returned by this method doesn't end with a directory separator unless it is the root directory of a drive.
See also temp , currentPath , homePath , and rootPath. See also fromNativeSeparators and separator. Returns true if directory dir and this directory have different paths or different sort or filter settings; otherwise returns false.
Returns true if directory dir and this directory have the same path and their sort and filter settings are the same; otherwise returns false. Returns the file name at position pos in the list of file names. Equivalent to entryList. See also count and entryList. Note: This macro cannot be used in a namespace. Initializes the resources specified by the. Normally, when resources are built as part of the application, the resources are loaded automatically at startup.
For example, if your application's resources are listed in a file called myapp. It should be called from main. If that is not possible, the following workaround can be used to init the resource myapp from the function MyNamespace::myFunction :.
Documentation contributions included herein are the copyrights of their respective owners. Qt and respective logos are trademarks of The Qt Company Ltd. All other trademarks are property of their respective owners. Detailed Description A QDir is used to manipulate path names, access information regarding paths and files, and manipulate the underlying file system.
QDir dir "example" ; if! The filter value is specified by combining values from the following list using the bitwise OR operator: Constant Value Description QDir::Dirs 0x List directories that match the filters. QDir::AllDirs 0x List all directories; i. QDir::Files 0x List files. QDir::Drives 0x List disk drives ignored under Unix. QDir::NoSymLinks 0x Do not list symbolic links ignored by operating systems that don't support symbolic links.
QDir::NoDot 0x Do not list the special entry ".
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