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DB access: read data

Updated on Thu, 2009-10-01 14:44. Originally created by dmitry on 2009-10-01 14:44.
// this will be in chain
St_db_Maker *dbMk=new St_db_Maker("db", "MySQL:StarDb", "$STAR/StarDb");
dbMk->SetDebug();
dbMk->SetDateTime(20090301,0); // event or run start time
dbMk->SetFlavor("ofl"); // pick up offline calibrations
// dbMk->SetFlavor("simu"); // use simulations calibration set

dbMk->Init();
dbMk->Make();

// this is done inside ::Make method
TDataSet *DB = 0;
// "dbMk->" will NOT be needed, if done inside your [subsys]DbMaker.
// Simply use DB = GetInputDb("Calibrations/[subsystem_name]")
DB = dbMk->GetInputDB("Calibrations/[subsystem_name]");
if (!DB) { std::cout << "ERROR: no db maker?" << std::endl; }

St_[subsystem_name][table_name] *[table_name] = 0;
[table_name] = (St_[subsystem_name][table_name]*) DB->Find("[subsystem_name][table_name]");

// fetch data and place it to appropriate structure
if ([table_name]) {
[subsystem_name][table_name]_st *table = [table_name]->GetTable();
std::cout << table->param1 << std::endl;
std::cout << table->paramN << std::endl;
}

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