SQL Server/T-SQL Tutorial/Cursor/DEALLOCATE cursor — различия между версиями

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Версия 13:46, 26 мая 2010

DEALLOCATE a cursor

4> USE master
5> GO
Changed database context to "master".
1>
2> CREATE PROC sp_cursor_info
3> (@scope int = 3)
4> AS
5> DECLARE @Report CURSOR
6> EXEC master.dbo.sp_cursor_list @cursor_return = @Report OUTPUT,
7>
8> @cursor_scope = @scope
9> FETCH NEXT FROM @Report
10> WHILE (@@FETCH_STATUS = 0)
11> BEGIN
12>     FETCH NEXT FROM @Report
13> END
14> CLOSE @Report
15> DEALLOCATE @Report
16> RETURN
17> GO
1>
2>


Fetching cursor data into variables and DEALLOCATE cursor

4>
5> CREATE TABLE titles(
6>    title_id       varchar(20),
7>    title          varchar(80)       NOT NULL,
8>    type           char(12)          NOT NULL,
9>    pub_id         char(4)               NULL,
10>    price          money                 NULL,
11>    advance        money                 NULL,
12>    royalty        int                   NULL,
13>    ytd_sales      int                   NULL,
14>    notes          varchar(200)          NULL,
15>    pubdate        datetime          NOT NULL
16> )
17> GO
1>
2> insert titles values ("1", "Secrets",   "popular_comp", "1389", $20.00, $8000.00, 10, 4095,"Note 1","06/12/94")
3> insert titles values ("2", "The",       "business",     "1389", $19.99, $5000.00, 10, 4095,"Note 2","06/12/91")
4> insert titles values ("3", "Emotional", "psychology",   "0736", $7.99,  $4000.00, 10, 3336,"Note 3","06/12/91")
5> insert titles values ("4", "Prolonged", "psychology",   "0736", $19.99, $2000.00, 10, 4072,"Note 4","06/12/91")
6> insert titles values ("5", "With",      "business",     "1389", $11.95, $5000.00, 10, 3876,"Note 5","06/09/91")
7> insert titles values ("6", "Valley",    "mod_cook",     "0877", $19.99, $0.00,    12, 2032,"Note 6","06/09/91")
8> insert titles values ("7", "Any?",      "trad_cook",    "0877", $14.99, $8000.00, 10, 4095,"Note 7","06/12/91")
9> insert titles values ("8", "Fifty",     "trad_cook",    "0877", $11.95, $4000.00, 14, 1509,"Note 8","06/12/91")
10> GO
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
1> CREATE TABLE sales(
2>    stor_id        char(4)           NOT NULL,
3>    ord_num        varchar(20)       NOT NULL,
4>    ord_date       datetime          NOT NULL,
5>    qty            smallint          NOT NULL,
6>    payterms       varchar(12)       NOT NULL,
7>    title_id       varchar(80)
8> )
9> GO
1> insert sales values("1", "QA7442.3", "09/13/94", 75, "ON Billing","1")
2> insert sales values("2", "D4482",    "09/14/94", 10, "Net 60",    "1")
3> insert sales values("3", "N914008",  "09/14/94", 20, "Net 30",    "2")
4> insert sales values("4", "N914014",  "09/14/94", 25, "Net 30",    "3")
5> insert sales values("5", "423LL922", "09/14/94", 15, "ON Billing","3")
6> insert sales values("6", "423LL930", "09/14/94", 10, "ON Billing","2")
7> GO
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
1>
2>
3>     DECLARE crTitleSales CURSOR FOR
4>               SELECT    title, qty
5>               FROM      titles t
6>                         JOIN sales s ON t.title_id = s.title_id
7>               WHERE     qty > 10
8>     DECLARE   @chvTitle varchar(100),
9>               @intQty smallint
10>     OPEN crTitleSales
11>     FETCH NEXT FROM crTitleSales INTO @chvTitle, @intQty
12>     CLOSE crTitleSales
13>     DEALLOCATE crTitleSales
14>     PRINT "First Title with sales quantity over 10"
15>     SELECT    @chvTitle AS "Title",
16>               @intQty AS "Quantity"
17>     GO
First Title with sales quantity over 10
Title                                                                                                Quantity
---------------------------------------------------------------------------------------------------- --------
Secrets                                                                                                    75
(1 rows affected)
1>
2> drop table titles;
3> drop table sales;
4> GO