class HOra2Conn: public TObject

 default constructor
 defines default values for user ("hades_ana") and the database
   ("db-hades", the HADES Oracle 8 database on Linux at GSI)
 User "hades_ana" has Readonly access to the Oracle tables.
 The connection to Oracle is not opened!

 default destructor (closes connection)

 opens default connection with readonly access

 opens connection to database Hades for user given by name
 asks for password

 opens connection to database with name dbName for user given by name
 asks for password

 opens connection (contains the SQL-statements)

 disconnects from ORACLE
 A transaction will be automatically rolled back,
 that means changes in the database are not stored
 without an explicit COMMIT

 disconnects from ORACLE
 may be opened again via reconnect()

 prints information about the database connection

 shows SQL error messages

 asks for the password

 opens connection (contains the SQL-statements)

EXEC SQL BEGIN DECLARE SECTION;

 Gets the actual run id from the current event file and compares it with
 the last used actRunId for fetching data.
 If they are different, the run start time (converted to a number od seconds) is
 read from Oracle and stored together with the run id in the data members
 run_id and runStart

 Sets the date to retrieve historic data
 Returns kFALSE when the date string cannot be converted to a valid date.
EXEC SQL BEGIN DECLARE SECTION;

 Sets the history date to the creation date of the parameter release give by name
EXEC SQL BEGIN DECLARE SECTION;

 Sets the history date to the creation date of the parameter release
 for the corresponding experiment
EXEC SQL BEGIN DECLARE SECTION;