You can declare cursors to execute a stored procedure that in turn executes a single select statement. You create this style of cursor by calling ct_cursor with type as CS_CURSOR_DECLARE and text as an execute statement that invokes the procedure.
For example, the select statement in the example above could be invoked by a stored procedure:
CREATE PROCEDURE titlecursorproc
@sales_val INT
AS
SELECT title_id, price, title FROM titles
WHERE ( total_sales > @sales_val )
FOR READ ONLY
For Client-Library cursors that execute an Adaptive Server stored procedure, you do not use host language variables and do not define any variable formats with ct_param—the server determines parameter formats from the declaration of the stored procedure. The steps required to declare and open the cursor are otherwise similar to those illustrated under “Declaring a cursor that takes parameters”. The example below shows how to declare and open a Client-Library cursor on the titlecursorproc stored procedure:
CS_CHAR body[1024];
CS_DATAFMT intfmt;
CS_INT sales_val;
strcpy(body, “EXECUTE titlecursorproc”);
ret = ct_cursor(cmd, CS_CURSOR_DECLARE,
“a cursor”, CS_NULLTERM,
body, CS_NULLTERM, CS_UNUSED);
... error checking deleted ...
ret = ct_cursor(cmd, CS_CURSOR_OPEN, NULL,
CS_UNUSED, NULL, CS_UNUSED,
CS_UNUSED);
... error checking deleted ...
/*
** Supply a value for the @sales_val parameter for
** titlecursorproc.
*/
(CS_VOID)memset(&intfmt, 0, sizeof(intfmt));
intfmt.datatype = CS_INT_TYPE;
intfmt.name[0] = '\0';
intfmt.namelen = 0;
intfmt.maxlength = CS_SIZEOF(CS_INT);
intfmt.locale = (CS_LOCALE *)NULL;
intfmt.status = CS_INPUTVALUE;
sales_val = 1;
ret = ct_param(cmd, &intfmt,
(CS_VOID *)&sales_val, CS_UNUSED, 0);
... error checking deleted ...
/*
** Send the batched cursor declare and open
** commands.
*/
ret = ct_send(cmd);
... error checking deleted ...
... results processing deleted ...
