Thanks for correcting me bob.. I saw so many mails regarding this JDBC drivers in stackoverflow.. I finally decided to use RESTful webservice instead of JDBC drivers..
I've gone through one example code at http://senior.ceng.metu.edu.tr/2009/praeda/2009/01/11/a-simple-restful-client-at-android/ In this he used to get the data from a stream.. But wgen i use with database it's not working.. How do i get the table names,column/row names, a particular key from a row/column present in the database?? Dont get angry for asking again & again the same question.. is it possible by writing like this?? http://WebAddresss:Port_num/DATABASE_NAME/Table_name/ if im giving like this is it going to work properly??? Is it compulsory to use XML files with REST webservice?? Waiting for ur help... Cheers Uday Kiran Pichika Bob Kerns wrote: > Brion gave some good suggestions, so let me address this from a more > architectural standpoint. > > You don't WANT to access the tables direction. A web service acts as > an intermediary -- it sits between your application and the database. > > This allows more control over how the application can access the > information. You can limit the application to change only certain > fields, or apply different security models. > > It also allows you to CHANGE your database. For example, to split a > table into two linked tables to achieve better normalization. If the > application could access the database directly, the SQL queries would > need to change (especially for updates). You would face an impossible > situation, as you simply cannot force people to upgrade their > applications. This is perhaps the biggest reason why web services are > so popular, and direct database connections are almost never used in > end-user applications these days. > > It also allows better performance -- through caching, connection > pooling, and other techniques. Database servers are simply not > designed for huge numbers of connections. > > A web service has direct connections to the database. It has as much > access to the tables as it needs. It's up to the web service what that > data looks like to the client application, and how much access the > client has. > > It can certainly present a model that parallels the database schema. > With a RESTful interfaice, you could have URIs that denote tables, > returning a list of URIs denoting primary keys in the table, and those > URIs in turn would return the content of the rows, etc. > > But usually it makes more sense to operate at a somewhat higher level, > where the URIs in the interface denote domain entities. For example, a > music service might have URIs that denote albums, composers, artists, > tracks, etc. Or, more likely, it would not have 'tracks' at all, and > asking for an album would return EVERYTHING about the album that the > application might need, because you can do that in a single step, > without repeatedly asking the server. > > This allows much better scaling, and much better performance and > reliability in the application, than asking for the same information > one piece at a time. This is yet another example of why you want a web > service, rather than accessing things at the database level. On a > phone in particular, there is a lot of latency. Each time you ask a > question, you have to wait for the information to flow both ways, and > all those delays add up. The web service has very fast connection to > the database, and can do all that quickly, so you only need to ask ONE > question, and get a faster answer. > > When designing a web service, it is entirely up to you what form the > data comes back in. You can construct whatever JSON or XML objects > that are convenient representations for the data the service provides > or uses. Whether you use JSONObject or an XML parser is up to you. > > > From: uday kiran <uday.pic...@gmail.com> > > Date: Mar 22, 8:15 am > > Subject: Accessing External Database > > To: Android Developers > > > > > > So, if we r using RESTful webservice is it possible to access the > > Tables present in the database??? > > and doing some operations on the database i.e) Adding/Deleting a row/ > > column into the database table?? > > > > I saw one example which uses JSON Object for getting the stream.. > > So if i want to access databases which class we need to use?? > > > > If u have any related code regarding this please let me know... > > > > Expecting more information regarding example code... > > > > Thanks in advance > > > > --Cheers > > Uday Kiran Pichika -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en To unsubscribe from this group, send email to android-developers+unsubscribegooglegroups.com or reply to this email with the words "REMOVE ME" as the subject.
