SAP Adaptive Server Enterprise Closing the Cursor

The CLOSE statement terminates processing for the specified cursor. CLOSE releases resources associated with the cursor, and subsequent references to that cursor are allowed only if another OPEN is executed. Although you can have multiple cursors open at the same time, you should close the cursors as soon as possible for efficiency reasons.

Unlike the DB-Library interface to SQL Server, the CT-Library interface lets you issue other commands while a cursor is open.


In this example, the additional request for the employee name (shown in bold) is issued while the cursor is open. Under the DB-Library interface, this request would have failed and returned a Results Pending message. Under the CT-Library interface, it succeeds.

string    dname
long      depthead
string    fname
string    lname

SQLCA.dbms = "SYC"
SQLCA.database = "mzctest"
SQLCA.logid = "mikec"
SQLCA.logpass = "mikecx"
SQLCA.servername = "SYB1001"
SQLCA.autocommit = "false"

if SQLCA.sqlcode <> 0 then
   MessageBox("Connect Error",SQLCA.sqlerrtext)
end if

DECLARE dept_curs CURSOR FOR SELECT dept_name,
   dept_head_id FROM department;
OPEN dept_curs;
if SQLCA.sqlcode < 0 then
   MessageBox("Open Cursor",SQLCA.sqlerrtext)
end if

DO WHILE SQLCA.sqlcode = 0
   FETCH dept_curs INTO :dname, :depthead;
   if SQLCA.sqlcode < 0 then
      MessageBox("Fetch Error",SQLCA.sqlerrtext)
   elseif SQLCA.sqlcode = 0 then
      SELECT emp_fname, emp_lname INTO
         :fname,:lname FROM employee
         WHERE emp_id = :depthead;
      if SQLCA.sqlcode <> 0 then
         MessageBox("Singleton Select",  & 
      end if
   end if

CLOSE dept_curs;
if SQLCA.sqlcode <> 0 then
   MessageBox("Close Cursor", SQLCA.sqlerrtext)
end if

See also

SAP Adaptive Server Enterprise SELECT