[Qt-interest] Data Storage for QT Application

[Neville Dastur]

John McClurkin wrote:
> Chitrang Srivastava wrote:
>   
>> Thanks All,
>> I tried QSetting
>>
>> my data is Country/Capital pair and number of entries can go upto 10-20.
>>
>> setValue("Country/Name","France")
>> setValue("Country/Capital","Paris")
>> setValue("Country/Name","Japan")
>> setValue("Country/Capital","Tokyo")
>>
>> Now with QSetting it always overwrite the key Country/Name  with latest 
>> value.
>> This isn't I was looking, is their way in QSetting to works as database 
>> with multiple value for same key?
>>
>> Basically I am looking for mini database  in which I can read-all , 
>> insert or search-and-delete a row.
>> Do you guys think their is a way to do in QSettings ?
>> Or I have to use some other API.
>> I dont want to use QSql (may be bulky for this small data).
>>     
I'm sorry but all this is a bit silly (not meant as a flame etc). SQL 
seems like the man for the job. Sqlite3 can be complied into a memory 
footprint of 180k. Compared to the fact that you are using Qt (which if 
memory serves me right will occupy 4M at least) and even the most 
mobiles have at least 256M ram, 180k is nothing. It will save to hours 
trying to re-create what a SQL db is designed for and is inherently 
scalable.
>> -Chits
>>     
> This is the documented behavior. According to the documentation:
>
> "If there already exists a setting with the same key, the existing value 
> is overwritten by the new value."
>
> What you may want is QMultiMap
>
>   
>>
>>
>> On Fri, Feb 5, 2010 at 4:04 PM, Ross Driedger <ross at earz.ca 
>> <mailto:ross at earz.ca>> wrote:
>>
>>
>>     On 5-Feb-10, at 2:16 AM, qt-interest-request at trolltech.com
>>     <mailto:qt-interest-request at trolltech.com> wrote:
>>
>>      > Thanks all, QSettings looks to be a favourite option.
>>      > I will look at the API description ,
>>      > Can you guys points to some example.
>>
>>     Assistant is your friend. :)
>>
>>      >
>>      >> From what I read of QSetting it is used to save settings and then
>>      >> retrive
>>      > based on specific key.
>>      > In may case their is no key.
>>      > Its like this.All are string data.At application start I want to
>>      > read the
>>      > data and populate some UI component.Also need to delete any
>>      > particular row
>>      > or add another row.I know XML is one way but some how I found their
>>      > API to
>>      > be bit cryptic .
>>      > Can this be done using QSettings?
>>
>>     In either case of XML or QSettings, you will need t set up a key-value
>>     relationship of some sort, even if the key makes no sense outside your
>>     application,
>>
>>     The QSettings API is pretty straight forward.  If you choose an XML
>>     solution, you will need to learn about SAX and/or DOM, but on the
>>     positive side, learning about XML is an important skill these days.
>>
>>     Ross Driedger
>>     ross_at_earz.ca <http://ross_at_earz.ca>
>>
>>
>>
>>
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>>
>>     
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