Programming Guide - Actian

How You Can Access a Database with Standard SQL StatementsThe following execute immediate statement runs the select statement and putsthe values returned in the vidtitle and vidno variables:execute immediate :statement into :vidtitle, :vidno;If you do not know the names and data types of the target variables untilruntime, create an SQLSelect or a query object to build the retrieval statementdynamically. For more information about dynamic query creation, see How YouCan Access a Database with DataStream Objects (see page 165) and How YouCan Use Query Objects (see page 177).How You Can Use Cursors to Access the DatabaseCursors are useful for:• Bringing only part of a result set across the network where lowcommunications bandwidth is an issue• Performing an unrelated operation in the midst of processing returnedrows (which can also be performed using a select loop)• Performing operations on returned values that span two or more eventblocks• Determining which of several select statements in a fetch loop to executeat runtime, for example:if frame_mode = MODE_SALES thenopen cursor1 for select salesname as name,salesquota as amountfrom sales where region = :region orderby amount;elseif frame_mode = MODE_MGRS thenopen cursor1 for select mgrname as name,budget as amount from managerswhere business_unit = :bus_unitorder by name;elseopen cursor1 for select staffname as name,salary as amountfrom staff where staff_code = :staff_codeORDER BY Amount;endif;i = 0;curs_state = CS_CURRENT;while (curs_state = CS_CURRENT) doi = i + 1;fetch cursor1 into :tf[i].name = name,:tf[i].amount = amount;curs_state = cursor1.state;endwhile;/* number of rows fetched = i-1 */close cursor1;Working with a Database 157