Thanks ... I was really comfortable with ur replies and it helped me a lot.
Is the data from JSON is sent to the server (the link of the exhibit-api.js) or is cached in browsers memory.I suggest the latter is true ?.... Can u help me in this thanks Sabarish S David Huynh-2 wrote: > > Sabrish Subramanian wrote: >> Thanks..it was really helpful to me. >> If data from JSON is stored in a cache , how are the queries parsed >> according to the users action (click) and how are they sent to the >> database. >> Can u direct me where does this happen and how ? thank u >> > Exhibit has a simple "expression language" for retrieving data from its > database. The technical details of that expression language can be read > from chapter 3 of my thesis: > http://people.csail.mit.edu/dfhuynh/research/thesis/thesis.html > > An Exhibit expression, e.g., > .parent-of.spouse-of > (meant to evaluate to sons and daughters in law) is parsed into some > internal data structures, which can then be used to evaluate against a > database. The parser is implemented here > > http://static.simile.mit.edu/exhibit/api-2.0/scripts/data/expression-parser.js > and the output of that parser is an Exhibit.Expression object as > implemented here > > http://static.simile.mit.edu/exhibit/api-2.0/scripts/data/expression.js > > Evaluating an expression programmatically typically involves something > like this: > > var expression = > Exhibit.ExpressionParser.parse(".parent-of.spouse-of"); > var result = expression.evaluate( > { "value" : "Joseph P. Kennedy" }, > { "value" : "item" }, > "value", > database > ); > result.values.visit(function(v) { > // print out v > }); > > This would print out > Ethel Skakel > Jacqueline L. Bouvier > Peter Lawford > Robert S. Shriver, Jr. > Stephen E. Smith > Victoria A. Reggie > William J.R. Cavendish > (i.e., sons and daughters in law of the first generation of the Kennedy > family). > > David > >> David Huynh-2 wrote: >> >>> Sabrish Subramanian wrote: >>> >>>> where is the data exactly stored from JSON files in exhibit ?...is it a >>>> cache >>>> or any in-memory model..... >>>> >>>> >>> The data is retrieved over to the browser and then stored into a >>> database implemented in Javascript. Here is the implementation: >>> >>> http://static.simile.mit.edu/exhibit/api-2.0/scripts/data/database.js >>> Basically, it's a simplified 3-tier web application framework, including >>> the database, implemented in Javascript. >>> >>> You can consider it a cache that doesn't support write back (into the >>> JSON files). >>> >>> David >>> _______________________________________________ >>> General mailing list >>> [email protected] >>> http://simile.mit.edu/mailman/listinfo/general >>> >>> >>> >> >> > > _______________________________________________ > General mailing list > [email protected] > http://simile.mit.edu/mailman/listinfo/general > > -- View this message in context: http://www.nabble.com/datastore-in-exhibit-tp15264995p15331935.html Sent from the SIMILE - General mailing list archive at Nabble.com. _______________________________________________ General mailing list [email protected] http://simile.mit.edu/mailman/listinfo/general
