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Attached is an update to contrib/tablefunc. It introduces a new

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function, connectby(), which can serve as a reference implementation for

the changes made in the last few days -- namely the ability of a
function to return an entire tuplestore, and the ability of a function
to make use of the query provided "expected" tuple description.

Description:

   connectby(text relname, text keyid_fld, text parent_keyid_fld,
     text start_with, int max_depth [, text branch_delim])
   - returns keyid, parent_keyid, level, and an optional branch string
   - requires anonymous composite type syntax in the FROM clause. See
     the instructions in the documentation below.

Joe Conway
This commit is contained in:
Bruce Momjian
2002-09-02 05:44:05 +00:00
parent 9fd842c4b2
commit 6aa4482f2f
5 changed files with 602 additions and 12 deletions
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46
contrib/tablefunc/tablefunc-test.sql
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@@ -1,8 +1,3 @@
--
-- show_all_settings()
--
SELECT * FROM show_all_settings();
--
-- normal_rand()
--
@@ -47,3 +42,44 @@ select * from crosstab4('select rowid, attribute, value from ct where rowclass =
select * from crosstab('select rowid, attribute, value from ct where rowclass = ''group1'' order by 1,2;', 2) as c(rowid text, att1 text, att2 text);
select * from crosstab('select rowid, attribute, value from ct where rowclass = ''group1'' order by 1,2;', 3) as c(rowid text, att1 text, att2 text, att3 text);
select * from crosstab('select rowid, attribute, value from ct where rowclass = ''group1'' order by 1,2;', 4) as c(rowid text, att1 text, att2 text, att3 text, att4 text);
-- test connectby with text based hierarchy
DROP TABLE connectby_tree;
CREATE TABLE connectby_tree(keyid text, parent_keyid text);
INSERT INTO connectby_tree VALUES('row1',NULL);
INSERT INTO connectby_tree VALUES('row2','row1');
INSERT INTO connectby_tree VALUES('row3','row1');
INSERT INTO connectby_tree VALUES('row4','row2');
INSERT INTO connectby_tree VALUES('row5','row2');
INSERT INTO connectby_tree VALUES('row6','row4');
INSERT INTO connectby_tree VALUES('row7','row3');
INSERT INTO connectby_tree VALUES('row8','row6');
INSERT INTO connectby_tree VALUES('row9','row5');
-- with branch
SELECT * FROM connectby('connectby_tree', 'keyid', 'parent_keyid', 'row2', 0, '~') AS t(keyid text, parent_keyid text, level int, branch text);
-- without branch
SELECT * FROM connectby('connectby_tree', 'keyid', 'parent_keyid', 'row2', 0) AS t(keyid text, parent_keyid text, level int);
-- test connectby with int based hierarchy
DROP TABLE connectby_tree;
CREATE TABLE connectby_tree(keyid int, parent_keyid int);
INSERT INTO connectby_tree VALUES(1,NULL);
INSERT INTO connectby_tree VALUES(2,1);
INSERT INTO connectby_tree VALUES(3,1);
INSERT INTO connectby_tree VALUES(4,2);
INSERT INTO connectby_tree VALUES(5,2);
INSERT INTO connectby_tree VALUES(6,4);
INSERT INTO connectby_tree VALUES(7,3);
INSERT INTO connectby_tree VALUES(8,6);
INSERT INTO connectby_tree VALUES(9,5);
-- with branch
SELECT * FROM connectby('connectby_tree', 'keyid', 'parent_keyid', '2', 0, '~') AS t(keyid int, parent_keyid int, level int, branch text);
-- without branch
SELECT * FROM connectby('connectby_tree', 'keyid', 'parent_keyid', '2', 0) AS t(keyid int, parent_keyid int, level int);