qt sql tutorial

problem.If you want to use an EXE neat release program, you need to use the static compiled version of the QT Library, there are tutorials online, I will not say, can teach you to use off-the-shelf, on the git-hub just have a static QT library:Https://github.com/fostersoftware/QtStaticWindowsHttps://github.com/fostersoftware/QtStaticLinuxThe second one is Linux, the Windows system download the first qtstat

' clock_gettime 'Modified: Vim src/corelib/makefile plus-LRTLIBS = $ (sublibs)-L/OPT/QT-EVERYWHERE-OPENSOURCE-SRC-4.8.4/LIB-LPTHREAD-LM-LDL-LRT7. Execute the Make install command;8. Modify User Environment variablesExport armqtdir=/usr/local/qt-4.8.4Export path= $ARMQTDIR/bin: $PATHExport manpath= $ARMQTDIR/man: $MANPATHExport ld_library_path= $ARMQTDIR/lib: $LD _library_path9. Test whether the ARM version

OT DatabaseIs the content to be introduced in this article, mainly to understandQTInDatabase.QtUsing the QtSql ModuleDatabaseThis module is a collection of classes. To use this module, we need to add the header file # include QT+=sql QSqlDatabase QSqlQuery is used to execute SQL-related statement transactionsDatabaseIs an important function, the so-called

how the actual table is queried. Here is an example: SQLite>* from company_view; This will produce the following results: ID NAME Age---------- ---------- ---------- 1 Paul 32 2 allen 25 3teddy 23 4 mark 255 david 27 6 kim22 7 james 24 Delete a viewTo delete a view, simply use the DROP view statement with view_name . The basic syntax for DROP VIEW is as follows: SQLite> DROP VIEW view_name; The following command will delete the Company_view view that we created earlier: S

-fno-use-cxa-atexit-fno-exceptions tions-dqt_no_debug- i/usr/lib/qt-3.1/mkspecs/default-I. -I/usr/lib/qt-3.1/include-I. UI/-I. MOC/-o. OBJ/main. O main. CPP /Usr/lib/qt-3.1/bin/UIC form_main.ui-I form_main.h-o. UI/form_main.cpp G ++-C-pipe-wall-w-O2-March = i386-mcpu = i686-g-dglx_glxext_legacy-fno-use-cxa-atexit-fno-exceptions tions-dqt_no_debug- i/usr/lib/

', 65000.00 );INSERT into Company(NAME,Age,ADDRESS,SALARY)VALUES( ' David ', 27, ' Texas ', 85000.00 );INSERT into Company(NAME,Age,ADDRESS,SALARY)VALUES( ' Kim ', 22, ' South-hall ' , 45000.00 INSERT into company (name,age ,address,salary) Span class= "PLN" > VALUES ( ' James ' , 24, ' Houston ' , 10000.00 This inserts 7 tuples into the company table, at which time the records for the company table are as follows: ID NAME Age ADDRESS SALARY---------- ---------- ---------- --------

clause, and the delete query is as follows: SQLite> DELETE from company; Now, there are no records in the company table because all the records have been deleted through the DELETE statement. SqliteLike clauseInstanceThe following examples demonstrate different places like clauses with the '% ' and ' _ ' operators: Statement Description WHERE SALARY like ' 200% ' Find any value starting with 200 WHERE SALARY like '%200% ' Find any

at the time of the connection, it's simple to do, just add the library to the. Pro file, as shown in:And then compile again, under normal circumstances will be compiled successfully, into the project directory, we will find a very long name of the folder, which is the QT in the compilation of the time produced by some intermediate files, of course, we compile the generated executable is also in the inside, the name and work name, open the console, En

QT is similar to MFC, also an SDK development package, his advantage is cross-platform. QT is very close to the original ecological C + +, the syntax is simple and clear. In the embedded development or comparative advantage. It gives application developers the functionality they need to build an art-level graphical user interface. QT is completely object-oriented

[QT Tutorial] 30th XML (iv) using stream to read and write XMLLandlord posted on 2013-5-22 13:03:33 |Views: 611 | Replies: 0 Using streams to read and write XMLCopyright notice this article original in the author Yafeilinux, reproduced please indicate the source.Introductory lead introduced two new classes from QT 4.3 to read and write XML documents: Q

The qsqlquerymodel class provides a read-only data model for the SQL result set. Next we will use this class for the simplest operation. Common functions Void qsqlquerymodel: setquery ("SQL statement") // executes an SQL statement. You can also input a qsqlquery object. In this case, you can use some features of the qsqlquery class, such as pre-operations. Sethea

Qt DatabaseLink and how to useSQLIs the content to be introduced in this article, mainly to learnQTMediumDatabaseAndSQLFor more information about how to use it, see this article. I have never been in touch with the database. I suddenly had the opportunity to use MySQL for the first time. I just learned SQL syntax and learned how to use Qt in combination with the

Label:Introduction: QT SQL is one of the important modules of QT, for the sake of convenience, QT has a series of packages for SQL, and divides the SQL API into the following three layers: (1) drive layer (2)

Introduction:QT SQL is one of the important modules of QT, for the sake of convenience, QT has a series of packages for SQL, and divides the SQL API into the following three layers:(1) drive layer(2) SQL API layer(3) User interfac

This article was originally reproduced at www.yafeilinux.com. Please indicate the source. SQL is the structured query language, which is the standard language for relational databases. As mentioned above, the qsqlquery class is used in QT to execute SQL statements. It should be noted that here we are only a QT

detailed configuration information. 3. View running results View the running result. If the above steps are successfully compiled, you can view the running result by running the demo that comes with Qt/Embedded. Run on the framebuffer of the host machine: cd$QTEDIR/examples/launcher ./launcher-qws Run on Virtualframebuffer: exportQTDIR=$QTEDIR exportPATH=$QTEDIR/bin:$PATH exportLD_LIBRARY_PATH=$QTEDIR/lib:$QT2DIR/lib:$LD_LIBRARY_

Tag: Test Designer implementation failed Oracle ETH long sqli 127.0.0.1The SQL class is divided into three tiers: user interface layer: These classes provide data-based widgets that connect to a database and are browsed by users. The QT Designer integrates these classes and can be used to create data-based forms. These widgets can interact directly with C + + code in your program. The classes that