в 13:45, 26 мая 2010

2010-05-26T13:45:56Z

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2010-05-26T10:13:46Z

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==Opens a transaction, declares the cur_publishers cursor, and closes it==



<source lang="sql">

postgres=# CREATE TABLE "publishers" (
postgres(# "id" integer NOT NULL,
postgres(# "name" text,
postgres(# "address" text,
postgres(# Constraint "publishers_pkey" Primary Key ("id")
postgres(# );
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "publishers_pkey" for table "publishers"
CREATE TABLE
postgres=#
postgres=#
postgres=# insert into publishers values(150, "Can Press", "29 Ave. Toronto, ON");
INSERT 0 1
postgres=# insert into publishers values(91, "Henry Inc.", "115 Street New York, NY");
INSERT 0 1
postgres=# insert into publishers values(113, "O Inc.", "101 St, Sebastopol, CA");
INSERT 0 1
postgres=# insert into publishers values(62, "W Pubs", "1515, New York");
INSERT 0 1
postgres=# insert into publishers values(105, "N Press", "19 W, New York");
INSERT 0 1
postgres=# insert into publishers values(99, "A Inc", "375 St, New York");
INSERT 0 1
postgres=# insert into publishers values(101, "Z Inc", "375 Ave, New York");
INSERT 0 1
postgres=# insert into publishers values(163, "M Press", "PO Box 1215");
INSERT 0 1
postgres=# insert into publishers values(171, "B", "16 W. 18th St. New York");
INSERT 0 1
postgres=# insert into publishers values(102, "P Inc", "375 Hudson St, New York");
INSERT 0 1
postgres=# insert into publishers values(75, "D Inc", "1540 Broadway, New York");
INSERT 0 1
postgres=# insert into publishers values(65, "H Pubs", "10 E 53rd St, New York");
INSERT 0 1
postgres=# insert into publishers values(59, "R Inc", "1540 Broadway, New York");
INSERT 0 1
postgres=#
postgres=# select * from publishers;
id | name | address
-----+------------+-------------------------
150 | Can Press | 29 Ave. Toronto, ON
91 | Henry Inc. | 115 Street New York, NY
113 | O Inc. | 101 St, Sebastopol, CA
62 | W Pubs | 1515, New York
105 | N Press | 19 W, New York
99 | A Inc | 375 St, New York
101 | Z Inc | 375 Ave, New York
163 | M Press | PO Box 1215
171 | B | 16 W. 18th St. New York
102 | P Inc | 375 Hudson St, New York
75 | D Inc | 1540 Broadway, New York
65 | H Pubs | 10 E 53rd St, New York
59 | R Inc | 1540 Broadway, New York
(13 rows)
postgres=#
postgres=#
postgres=# --Opens a transaction, declares the cur_publishers cursor, and closes it:
postgres=#
postgres=# BEGIN;
BEGIN
postgres=# DECLARE cur_publishers CURSOR FOR SELECT * FROM publishers;
DECLARE CURSOR
postgres=# CLOSE cur_publishers;
CLOSE CURSOR
postgres=#
postgres=# drop table publishers;
DROP TABLE
postgres=#

</source>

==Using cursor in transaction==



<source lang="sql">
postgres=#
postgres=# CREATE TABLE employee (
postgres(# ID int,
postgres(# name varchar(10),
postgres(# salary real,
postgres(# start_date date,
postgres(# city varchar(10),
postgres(# region char(1)
postgres(# );
CREATE TABLE
postgres=#
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (1, "Jason", 40420, "02/01/94", "New York", "W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (2, "Robert",14420, "01/02/95", "Vancouver","N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (3, "Celia", 24020, "12/03/96", "Toronto", "W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (4, "Linda", 40620, "11/04/97", "New York", "N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (5, "David", 80026, "10/05/98", "Vancouver","W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (6, "James", 70060, "09/06/99", "Toronto", "N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (7, "Alison",90620, "08/07/00", "New York", "W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (8, "Chris", 26020, "07/08/01", "Vancouver","N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (9, "Mary", 60020, "06/09/02", "Toronto", "W");
INSERT 0 1
postgres=#
postgres=# select * from employee;
id | name | salary | start_date | city | region
----+--------+--------+------------+-----------+--------
1 | Jason | 40420 | 1994-02-01 | New York | W
2 | Robert | 14420 | 1995-01-02 | Vancouver | N
3 | Celia | 24020 | 1996-12-03 | Toronto | W
4 | Linda | 40620 | 1997-11-04 | New York | N
5 | David | 80026 | 1998-10-05 | Vancouver | W
6 | James | 70060 | 1999-09-06 | Toronto | N
7 | Alison | 90620 | 2000-08-07 | New York | W
8 | Chris | 26020 | 2001-07-08 | Vancouver | N
9 | Mary | 60020 | 2002-06-09 | Toronto | W
(9 rows)
postgres=#
postgres=#
postgres=# BEGIN;
BEGIN
postgres=# DECLARE cur_employee CURSOR FOR SELECT id, name FROM employee;
DECLARE CURSOR
postgres=# FETCH FORWARD 2 IN cur_employee;
id | name
----+--------
1 | Jason
2 | Robert
(2 rows)
postgres=# -- Fetch backwards in the cur_employee cursor:
postgres=#
postgres=# FETCH BACKWARD 3 IN cur_employee;
id | name
----+-------
1 | Jason
(1 row)
postgres=#
postgres=# END;
COMMIT
postgres=#
postgres=#
postgres=#
postgres=# drop table employee;
DROP TABLE
postgres=#
postgres=#

</source>

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PostgreSQL/Cursor/Declare Cursor - История изменений

в 13:45, 26 мая 2010

Admin: 1 версия