BTW: As I've asked before, but I guess got ignored, does anyone have a make file for ECPG on the WIN32 platform?
Dick Goulet
Senior Oracle DBA
Oracle Certified 8i DBA
How about:
EXEC SQL BEGIN DECLARE SECTION;
int *num = NULL
char **string = NULL;
int low, high;
char *context = "some context";
EXEC SQL END DECLARE SECTION;
EXEC SQL SELECT number, string INTO :num, string
WHERE number BETWEEN :low AND :hi AND string = :context;
num_rec_returned = sqlca.sqlerrd[2];
for(i = 0; i < num_rec_returned; ++i)
printf("%d %s", num, string);
free(num);
free(string);
ECPG will alloc the memory it needs, you just need to remember to free()
it. And yes, free(string) frees all of string and string[0], string[1], ... string[n].
Just remember to pass in NULL pointers to your SELECT statement.
On Mon, 2004-03-29 at 06:13, Stergios Zissakis wrote: Hi there,
It is possible to do bulk retrievals using ECPG?
What I mean is that I want to be able to delcare a host array variable, of
size 100 for example, and get
to retrive my data in batches of 100 rows.
To be more specific the following piece of code, using a cursor, results in
the databse being accessed at every fetch statement degrading performance:
sprintf(stmt, "select * from test where number between %d and %d and
string = \'%s\'", lower, upper, context);
EXEC SQL PREPARE S FROM :stmt; EXEC SQL AT :ctx DECLARE curs CURSOR FOR S; EXEC SQL AT :ctx OPEN curs;
EXEC SQL WHENEVER NOT FOUND DO break;
while( true ) { EXEC SQL AT :ctx FETCH NEXT FROM curs INTO :num, :str; }
What alternatives do I have to fetch things in bulk?
Thanks for your help.
Regards,
Stergios Zissakis
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