DROP TABLE IF EXISTS graph_base;
DROP TABLE IF EXISTS graph;
CREATE TABLE graph_base (
from_id INT UNSIGNED NOT NULL,
to_id INT UNSIGNED NOT NULL,
PRIMARY KEY (from_id,to_id),
INDEX (to_id)
) ENGINE=MyISAM;
CREATE TABLE graph (
latch   VARCHAR(32) NULL,
origid  BIGINT    UNSIGNED NULL,
destid  BIGINT    UNSIGNED NULL,
weight  DOUBLE    NULL,
seq     BIGINT    UNSIGNED NULL,
linkid  BIGINT    UNSIGNED NULL,
KEY (latch, origid, destid) USING HASH,
KEY (latch, destid, origid) USING HASH
) ENGINE=OQGRAPH DATA_TABLE='graph_base' ORIGID='from_id', DESTID='to_id';
INSERT INTO graph_base(from_id, to_id) VALUES (1,2), (2,1);
SELECT count(*) FROM graph;
count(*)
2
SELECT count(*) FROM graph_base;
count(*)
2
INSERT INTO graph_base(from_id, to_id) VALUES (12,10);
SELECT count(*) FROM graph;
count(*)
3
SELECT count(*) FROM graph_base;
count(*)
3
INSERT INTO graph_base(from_id, to_id) VALUES (14,13);
SELECT count(*) FROM graph;
count(*)
4
SELECT count(*) FROM graph_base;
count(*)
4
DELETE FROM graph_base where from_id=10 and to_id=11;
INSERT INTO graph_base(from_id, to_id) VALUES (10,15);
INSERT INTO graph_base(from_id, to_id) VALUES (15,13);
INSERT INTO graph_base(from_id, to_id) VALUES (10,11);
SELECT count(*) FROM graph;
count(*)
7
SELECT count(*) FROM graph_base;
count(*)
7
INSERT INTO graph_base(from_id, to_id) VALUES (21,22);
INSERT INTO graph_base (from_id,to_id) VALUES (4,6);
SELECT count(*) FROM graph;
count(*)
9
SELECT count(*) FROM graph_base;
count(*)
9
SELECT * FROM graph  where latch='0';
latch	origid	destid	weight	seq	linkid
0	NULL	NULL	NULL	NULL	1
0	NULL	NULL	NULL	NULL	2
0	NULL	NULL	NULL	NULL	12
0	NULL	NULL	NULL	NULL	10
0	NULL	NULL	NULL	NULL	14
0	NULL	NULL	NULL	NULL	13
0	NULL	NULL	NULL	NULL	15
0	NULL	NULL	NULL	NULL	11
0	NULL	NULL	NULL	NULL	21
0	NULL	NULL	NULL	NULL	22
0	NULL	NULL	NULL	NULL	4
0	NULL	NULL	NULL	NULL	6
SELECT * FROM graph_base;
from_id	to_id
1	2
2	1
4	6
10	11
10	15
12	10
14	13
15	13
21	22
# And delete all references to node 2
DELETE FROM graph_base WHERE from_id=2;
DELETE FROM graph_base WHERE to_id=2;
SELECT count(*) FROM graph;
count(*)
7
SELECT count(*) FROM graph_base;
count(*)
7
SELECT * FROM graph  where latch='0';
latch	origid	destid	weight	seq	linkid
0	NULL	NULL	NULL	NULL	12
0	NULL	NULL	NULL	NULL	10
0	NULL	NULL	NULL	NULL	14
0	NULL	NULL	NULL	NULL	13
0	NULL	NULL	NULL	NULL	15
0	NULL	NULL	NULL	NULL	11
0	NULL	NULL	NULL	NULL	21
0	NULL	NULL	NULL	NULL	22
0	NULL	NULL	NULL	NULL	4
0	NULL	NULL	NULL	NULL	6
SELECT * FROM graph_base;
from_id	to_id
4	6
10	11
10	15
12	10
14	13
15	13
21	22
DELETE FROM graph_base;
SELECT count(*) FROM graph;
count(*)
0
SELECT count(*) FROM graph_base;
count(*)
0
SELECT * FROM graph  where latch='0';
latch	origid	destid	weight	seq	linkid
SELECT * FROM graph_base;
from_id	to_id
FLUSH TABLES;
TRUNCATE TABLE graph_base;
DROP TABLE graph_base;
DROP TABLE graph;