Openedge Data Management: SQL Reference - Product ...

Example
ESQL elements and statements
/*
** One way to limit the number of rows returned is to
** set a new value for "j" here. As supplied in the SPORTS2000 database,
** the PUB.InventoryTrans table contains 75 rows.
*/
j = 100;
for (i = 0; i < j; i++)
{
EXEC SQL FETCH dyncur INTO
:int_p1_v, :int_p2_v, :char_p_v ;
if (i == 0)
{
printf (" 1st col 2nd col 3rd col");
printf (" ------- ------- --------");
}
printf (" %d %d %s ",
int_p1_v, int_p2_v, char_p_v) ;
}
Notes • A FETCH operation requires that the cursor be open.
• The positioning of the cursor for each FETCH operation is as follows:
– The first time you execute a FETCH statement after opening the cursor, the cursor is
positioned to the first row of the active set.
– Subsequent FETCH operations advance the cursor position in the active set. The next
row becomes the current row.
– When the current row is deleted using a positioned DELETE statement, the cursor is
positioned before the row after the deleted row in the active set.
• The cursor can only be moved forward in the active set by executing FETCH statements. To
move the cursor to the beginning of the active set, you must CLOSE the cursor and OPEN it
again.
• If the cursor is positioned on the last row of the active set or if the active set does not
contain any rows, executing a FETCH will return the status code SQL_NOT_FOUND in the
SQLDA.
• After a successful FETCH, the total row count fetched so far for this cursor is returned in
sqlca.sqlerrd[2]. The count is set to zero after an OPEN cursor operation.
• You can FETCH multiple rows in one FETCH operation by using array variables in the INTO
clause. The SQL_NOT_FOUND status code is returned in the SQLCA when the end of the active
set is reached, even if the current FETCH statement returns one or more rows.
• If you use array variables in a FETCH statement, the array sizes are set to the number of
rows fetched after the FETCH statement is executed.
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