static bool RunExample()
{
// our connection pool
DBI::ConnectorPool connectors;
// database location
logs.info() << "opening the database file";
auto error = connectors.open(new DBI::Adapter::SQLite(), "dbi-example.db");
if (error)
{
logs.error() << "impossible to establish a connection to the database";
return false;
}
// begin a new transaction
auto tx = connectors.begin();
// create a new table if not already exists
logs.info() << "creating the table 'example'";
tx.perform("CREATE TABLE IF NOT EXISTS example (x INTEGER PRIMARY KEY);");
// truncate the table, if it already exists
logs.info() << "truncating the table";
tx.truncate("example");
// fill it with some values
logs.info() << "inserting some data";
tx.perform("INSERT INTO example (x) VALUES (42), (3), (-1), (-10), (-3);");
// iterating through a result set
{
uint rowindex = 0;
logs.info();
logs.info() << "iterating through all values";
auto stmt = tx.prepare("SELECT * FROM example WHERE x > $1 ORDER BY x");
stmt.bind(0, -5); // x > -5
stmt.execute();
// iterate through all values
stmt.each([&] (DBI::Row& row) -> bool
{
sint64 x = row[0].asInt64();
logs.info() << " :: resultset: in row " << (++rowindex) << ": x = " << x;
return true; // continue
});
}
// commit changes
logs.info() << "commit";
if (DBI::errNone != (error = tx.commit()))
{
logs.error() << "commit failed";
return false;
}
return true;
}
static void APISum(Messaging::Context& context, Marshal::Object& response)
{
// our parameters
double a, b;
if (not context.params["a"].to(a) or not context.params["b"].to(b))
{
// the parameters are not valid, exiting with a 400 status code
// (Bad Request, The request cannot be fulfilled due to bad syntax.)
// see http://en.wikipedia.org/wiki/List_of_HTTP_status_codes
context.httpStatus = 400;
// log server
logs.error() << "[method:sum] invalid parameters";
return;
}
// log server
logs.info() << "[method:sum] " << a << " + " << b << " = " << (a + b);
// the response
response["a"] = a;
response["b"] = b;
response["sum"] = (a + b);
}