int main(int argc, char **argv)
{
dbDriver *driver;
dbHandle handle;
int stat;
parse_command_line(argc, argv);
driver = db_start_driver(parms.driver);
if (driver == NULL)
G_fatal_error(_("Unable to start driver <%s>"), parms.driver);
db_init_handle(&handle);
db_set_handle(&handle, parms.database, NULL);
stat = db_create_database(driver, &handle);
db_shutdown_driver(driver);
exit(stat == DB_OK ? EXIT_SUCCESS : EXIT_FAILURE);
}
/*****************************************************************************************************************************
open
Prepares the database for use. An existing database is opened or otherwise an empty database is created.
If the database is openend a table _META with meta info is loaded into a dictionary _META. The dictionary key is the
code of the data element. A data element is either a tabel (dimension/event) or a field (characteristic/property).
The value of the dictionary is the MET_INFO structure. This structure contains meta data about the data element.
If the database is created an empty table _META is created.
The function calls virtual functions, db_, which must be overriden by a derived class for a specific database implementation.
******************************************************************************************************************************/
void ARAS::open(DBInfo dbInfo) {
if (isopen)
return;
// store db information
this->dbInfo = dbInfo;
// open or create database
// performs the database specific initialization code, the specific information to be used is stored in the struct DBInfo.
db_init_database();
// performs the database specific code to check whether a database alreay exists and open it.
if (db_open_database()) {
// read _META table from database into dictionary _META
TABLE values;
db_select_table("_META", {"CODE","INFO"}, values);
for (auto i : values)
_META.insert(std::pair<std::string, META_INFO>(i[0], META_INFO(i[1])));
}
else {
// performs the database specific code to create a new database based on DBInfo.
db_create_database();
// create table _META: define the columns
META_INFO imeta(data_type::DIM, 0, "_META", "", "", "_META", "CODE", 0, 0, 0, 0);
META_INFO icode(data_type::STR, SIZE_META_CODE_MAX, "_META", "", "","_META", "", 0, 0, 1, 0);
META_INFO idescs(data_type::STR, SIZE_DESCS_MAX, "_META", "", "", "_META", "", 0, 0, 0, 0);
META_INFO idescl(data_type::STR, SIZE_DESCL_MAX, "_META", "", "", "_META", "", 0, 0, 0, 0);
META_INFO iinfo(data_type::STR, 0, "_META", "", "", "_META", "",0, 0, 0, 0);
// define the table
META_TABLE meta = { { "_META", "Meta data", "Meta data", imeta }, { "CODE", "CODE", "CODE", icode }, { "DESCS", "Short Description", "Short Description", idescs }, { "DESCL", "Long Description", "Long Description", idescl }, { "INFO", "INFO", "INFO", iinfo } };
// performs the database specific code to create a new table
db_create_table(meta);
// load the meta data into the dictionary and the database table _META
for (auto i : meta)
insert_meta(i);
}
}
