Difference between revisions of "Development/Tutorials/SqLite"

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SqLite allows you to store data in a file and query this data using SQL just as you would do with a database server. As an example if you want to manage your stock transactions selecting all buy transactions from a flat file is tedious. Using sqlite you can just issue something like
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select * from transactions where type='buy'
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and you do not need a database server.
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= Files =
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== main.cpp ==
 
<pre>
 
<pre>
 
#include <QtSql>
 
#include <QtSql>
Line 19: Line 26:
 
</pre>
 
</pre>
  
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== sqlite.pro ==
 
<pre>
 
<pre>
 
QT      += core gui sql
 
QT      += core gui sql
Line 33: Line 41:
 
FORMS    += mainwindow.ui
 
FORMS    += mainwindow.ui
 
</pre>
 
</pre>
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 +
= Build it =
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To build the example project, use the command
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qmake && make -j4
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 +
= Run it =
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To run the example project, first delete sqlite.dat from your home directory. We do this to show that our example program creates it.
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rm ~/sqlite.dat
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Then run our example program:
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./sqlite
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And you will find the database file in your home folder:
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ll /root/sqlite.dat
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-rw-r--r-- 1 root root 3072 Nov 10 10:37 /root/sqlite.dat
  
 
= See also =
 
= See also =
 
http://doc.trolltech.com/4.5/sql-relationaltablemodel.html
 
http://doc.trolltech.com/4.5/sql-relationaltablemodel.html
 
http://commits.kde.org/kdeexamples/23d2202b0e7aca8999928374746da5733712ebc8
 
http://commits.kde.org/kdeexamples/23d2202b0e7aca8999928374746da5733712ebc8

Revision as of 10:55, 10 November 2011

SqLite allows you to store data in a file and query this data using SQL just as you would do with a database server. As an example if you want to manage your stock transactions selecting all buy transactions from a flat file is tedious. Using sqlite you can just issue something like

select * from transactions where type='buy'

and you do not need a database server.

Contents

Files

main.cpp

#include <QtSql>

int main(int argc, char *argv[])
{
    QSqlDatabase db;
    db=QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("sqlite.dat");

    if (db.open()) 
        qDebug() << "success";
    else 
        qDebug() << "failed";
    QSqlQuery query;
    query.exec("create table stocks(id int primary key, name varchar(20))");
    db.commit();
    db.close();
}

sqlite.pro

QT       += core gui sql

TARGET = sqlite
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

Build it

To build the example project, use the command

qmake && make -j4

Run it

To run the example project, first delete sqlite.dat from your home directory. We do this to show that our example program creates it.

rm ~/sqlite.dat

Then run our example program:

./sqlite

And you will find the database file in your home folder:

ll /root/sqlite.dat 
-rw-r--r-- 1 root root 3072 Nov 10 10:37 /root/sqlite.dat

See also

http://doc.trolltech.com/4.5/sql-relationaltablemodel.html http://commits.kde.org/kdeexamples/23d2202b0e7aca8999928374746da5733712ebc8


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