Database Cursor Functions

Database cursor functions are useful when you want to process few records at a time in a large result set of queries. They help you to get database records, insert database records, and delete database records.

The following database functions are available in the catalog functions under RDBMS:

createQuery()
getNextPage()
getPreviousPage()
getNextPageFromOffset()
getPreviousPageFromOffset()
closeQuery()

Example of Database Cursor Functions

debugOut("Database Cursor Demo Starts");
Database.setCurrentConnection("/SharedResources/HR_DB_Conn.sharedjdbc");
String cursorName=Database.createQuery("/SharedResources/HR_DB_Conn.sharedjdbc", "EmpCursor", "/Concepts/HR/EMPLOYEES", "select * from employees", 10, null);
debugOut("Opened Cursor: " + cursorName);
try{
Concept[] empCepts=Database.getNextPage(cursorName, 10);
debugOut("Database.getNextPage() fetched " + empCepts@length + " rows");
 while(empCepts !=null && empCepts@length > 0){
empCepts=Database.getNextPage(cursorName, 10);
debugOut(" Database.getNextPage() fetched " + empCepts@length + " rows");
for(int i; i < empCepts@length ; i=i+1){
      debugOut(" "+empCepts[i]);
      }
   }
debugOut("@ end");
} finally {
   if(cursorName !=null){
   Database.closeQuery(cursorName);
   }
}