Question:
I want to retrieve data from a database that is not associated withany objects on a form. How do I do this?
Answer:
A recordset is a client-side mechanism for holding retrieved datathat is automatically created for each bound container in a PowerObjects application. Power Objects allow you to dynamically createrecordsets that are not connected with any containers.
To create a standalone recordset, you first create an object variableto hold the reference to the recordset and then use the NEWDBRECORDSET command to create the recordset. The session that willbe used for the recordset is indicated as a parameter of the command.
Once the recordset is created, you can specify the data you want froma database by using the SetQuery() method. The SetQuery() method isassociated the recordset with a database session object with thestandard do reference. The first parameter assigns an SQL statementthat will be used to define the recordset and the second parameter isa boolean that indicates whether the recordset will be updateable.OPO will set up columns in the recordset to correspond to the columnsin the SQL statement.
To actually retrieve data, you use the Requery() function, which isNOT in the Power Objects version 1 documentation. The Requery()function causes the SQL statement to be sent to the designated serverand the return of data, if appropriate.
The complete code sequence for using a standalone recordset is:
DIM objRecSet As Object DIM sSQL As String sSQL = "SELECT EMPNO, ENAME, HIREDATE FROM EMP" objRecSet = NEW DBRECORDSET(MLDATA) objRecSet.SetQuery( sSQL, FALSE) objRecSet.Requery()
Once you have created a standalone recordset, you can use any of thestandard recordset methods with it, such as GetColVal() orInsertRow(). It’s often easier to use standalone recordsets than touse the EXEC SQL function.
