Hi,
Results of investigating this issue and a proposed solution
are shared below, I hope this helps to close this bug.
How to reproduce:
1. Install Debian testing (Wheeze) with network install;
select the Xfce desktop environment; install only
desktop environment, laptop and, system tools
categories (No server packages).
2. apt-get install fritzing
3. run Fritzing in a terminal:
pp@od:~$ Fritzing
QSqlDatabase: QSQLITE driver not loaded
QSqlDatabase: available drivers: QMYSQL3 QMYSQL
QSqlDatabase: QSQLITE driver not loaded
QSqlDatabase: available drivers: QMYSQL3 QMYSQL
QSqlDatabasePrivate::addDatabase: duplicate connection name
'qt_sql_default_connection', old connection removed.
QSqlDatabase: QSQLITE driver not loaded
QSqlDatabase: available drivers: QMYSQL3 QMYSQL
QSqlDatabasePrivate::addDatabase: duplicate connection name
'qt_sql_default_connection', old connection removed.
QSqlQuery::prepare: database not open
...
4. The "problem with the swapping mechanism"... dialog is shown.
How to fix:
5. apt-get install libqt4-sql-sqlite
6. Fritzing now runs fine.
Root cause: Fritzing requires the sqlite plugin for
libqt4-sql [1], but the dependencies include libqt4-sql only,
not the libqt4-sql-sqlite package. In some debian installations,
another package has alreay required libqt4-sql-sqlite and
the problem does not show there.
In a friend's laptop with OpenSUSE, rpm -q -R fritzing
shows libqt4-sql-sqlite in the dependencies in addition
to libqt4-sql.
Proposed solution:
Update the fritzing package to include libqt4-sql-sqlite
in the dependencies.
--
Regards,
Patricio
[1]
https://code.google.com/p/fritzing/source/browse/trunk/fritzing/src/referencemodel/sqlitereferencemodel.cpp#168
Use of sqlite is also mentioned here:
http://fritzing.org/developer/programmer-intro/
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