![CREATE EXTENSION neo4j_fdw;
CREATE EXTENSION
CREATE SERVER foo
FOREIGN DATA WRAPPER neo4j_fdw
OPTIONS (url 'http://localhost:7474/db/data/cypher');
CREATE SERVER
CREATE FOREIGN TABLE bar2 (
name text,
follower_name text,
follower_gender text)
SERVER foo
OPTIONS (query '{"query":"START n=node(*) MATCH p=n<-[]-fm
RETURN n.name as name , fm.name as follower_name, fm.gender? as follower_gender " }');
CREATE FOREIGN TABLE
SELECT name, follower_name, follower_gender FROM bar2;
name | follower_name | follower_gender
---------+---------------+-----------------
Yamato | Akagi | Famale
Musashi | Yamato | Male
Akagi | Hiryu | Famale
Akagi | Yamato | Male
Kaga | Hiryu | Famale
Kaga | Musashi | Male
Nagato | Mutsu | Male
Nagato | Yamato | Male
Mutsu | Nagato | Male
Hiryu | Soryu | Famale
Hiryu | Akagi | Famale
Soryu | Hiryu | Famale
(12 rows)
グラフデータベースの
ビューを定義して、
そこへ SQL で問い合わせ](https://image.slidesharecdn.com/lt-mysqlpostgresql6-140415064319-phpapp01/85/my-sql-postgresql-6-LT-PostgreSQL-15-320.jpg)
![[nuko]$ LOG: loaded library "hartmanhook"
LOG: database system was shut down at 2014-02-16 04:45:33 PST
LOG: database system is ready to accept connections
LOG: autovacuum launcher started
[nuko]$ psql test
psql (9.3.2)
Type "help" for help.
test=# SELECT 1;
NOTICE: Sir, yes, sir!
?column?
----------
1
(1 row)
test=# d
NOTICE: Sir, yes, sir!
List of relations
Schema | Name | Type | Owner
--------+------+-------+--------
public | test | table | harada
(1 row)
test=#
SQL を投げると
ハートマン軍曹から
罵ってもらえます
（現在実装中）](https://image.slidesharecdn.com/lt-mysqlpostgresql6-140415064319-phpapp01/85/my-sql-postgresql-6-LT-PostgreSQL-21-320.jpg)
my sql-postgresql勉強会#6 LT 私的なPostgreSQLの楽しみ方
- 1. OSS ユーザーのための勉強会 <OSS X Users Meeting> #6 PostgreSQL と MySQL Lighting-Talk 私的な PostgreSQL の楽しみ方 ぬこ＠横浜 (@nuko_yokohama)
- 3. さて、 MySQL と PostgreSQL どっち派なの？と聞かれたら 躊躇なく PostgreSQL 派と 私は答えちゃうわけですが
- 6. ユーザ定義関数 ユーザ定義型 独自インデックス Foreign Data Wrapper Background Worker Process Custom Scan API 手続き言語ハンドラ HOOK 組込 etc ・・・
- 9. SELECT data, data + ' 拾 ' FROM ksj_sample; data | ?column? ------------+---------------- 五百壱拾六 | 五百弐拾六 零 | 壱拾 参万壱百壱 | 参万壱百壱拾壱 (3 rows) SELECT data, data * ' 拾 ' FROM ksj_sample; data | ?column? ------------+-------------- 五百壱拾六 | 五千壱百六拾 零 | 零 参万壱百壱 | 参拾壱千壱拾 (3 rows) SELECT data, data % ' 拾 ' FROM ksj_sample; data | ?column? ------------+---------- 五百壱拾六 | 六 零 | 零 参万壱百壱 | 壱 (3 rows) SELECT sum(data) FROM ksj_sample; sum ---------------- 参万六百壱拾七 (1 row) SELECT * FROM ksj_sample ORDER BY data; data ------------ 零 五百壱拾六 参万壱百壱 (3 rows) 漢数字で 四則演算や 比較演算できます
- 11. SELECT * FROM foo WHERE data = ' 味噌らーめん '; id | data ----+-------------- 1 | 味噌ラーメン (1 row) SELECT * FROM foo WHERE data = 'postgresql'; id | data ----+---------------------- 2 | ＰｏｓｔｇｒｅＳＱＬ (1 row) SELECT * FROM foo WHERE data = ' エバンゲリオン '; id | data ----+------------ 3 | ｴｳﾞｧﾝｹﾞﾘｦﾝ (1 row) SELECT * FROM foo WHERE data = ' センヌリティウス '; id | data ----+------ (0 rows) SELECT * FROM foo WHERE data = ' フィロストラス '; id | data ----+------ (0 rows) SELECT * FROM foo WHERE data /= ' センヌリティウス '; id | data ----+------------------ 4 | セリヌンティウス (1 row) SELECT * FROM foo WHERE data /= ' フィロストラス '; id | data ----+------------------ 5 | フィロストラトス (1 row) 日本語正規化 ＋ typo を許容
- 13. Neo4j Server Neo4j Foriegn Data Wrapper PostgreSQL REST I/FCypher Query JSON Result SQL PostgreSQL Record Set Cypher Query Execute Cypher Query on REST Generate PostgreSQL Record Neo4j-FDW Concept Do not convert SQL into Cypher!
- 15. CREATE EXTENSION neo4j_fdw; CREATE EXTENSION CREATE SERVER foo FOREIGN DATA WRAPPER neo4j_fdw OPTIONS (url 'http://localhost:7474/db/data/cypher'); CREATE SERVER CREATE FOREIGN TABLE bar2 ( name text, follower_name text, follower_gender text) SERVER foo OPTIONS (query '{"query":"START n=node(*) MATCH p=n<-[]-fm RETURN n.name as name , fm.name as follower_name, fm.gender? as follower_gender " }'); CREATE FOREIGN TABLE SELECT name, follower_name, follower_gender FROM bar2; name | follower_name | follower_gender ---------+---------------+----------------- Yamato | Akagi | Famale Musashi | Yamato | Male Akagi | Hiryu | Famale Akagi | Yamato | Male Kaga | Hiryu | Famale Kaga | Musashi | Male Nagato | Mutsu | Male Nagato | Yamato | Male Mutsu | Nagato | Male Hiryu | Soryu | Famale Hiryu | Akagi | Famale Soryu | Hiryu | Famale (12 rows) グラフデータベースの ビューを定義して、 そこへ SQL で問い合わせ
- 17. hb_worker.so Postgres server(9.3) Background Worker Process (libpq を使用 ) 【 postgresql.conf 】 shared_preload_libraries = 'hb_worker' hb_worker.conninfo = 'dbname=xxx user=yyy' psql チャネル HB_SV チャネル HB_CL NOTIFY HB_CL,' 結果 ' NOTIFY HB_SV,' 数字列 ' こんな感じ 起動 LISTEN HB_CL 起動 LISTEN HB_SV ロード・起動 数当て判定処理
- 18. psql からの実行例 postgres=# LISTEN HB_CL; LISTEN postgres=# NOTIFY HB_SV,'xxxx';; NOTIFY Asynchronous notification "hb_cl" with payload "Invalid data.(xxxx)" received from server process with PID 29520. postgres=# NOTIFY HB_SV,'0123';; NOTIFY Asynchronous notification "hb_cl" with payload "2 Hit / 1 Blow." received from server process with PID 29520. postgres=# NOTIFY HB_SV,'0813';; NOTIFY Asynchronous notification "hb_cl" with payload "4 Hit! Conguratulatoins!, next new game." received from server process with PID 29520. postgres=# hb_worker の応答 LOG: NOTIFY HB_CL,'2 Hit / 1 Blow.' LOG: hb_worker: NOTIFY HB_CL,'4 Hit! Conguratulatoins!, next new game.' LOG: hb_worker: set secret number=0391 （注：見やすさのために適宜改行している） psql から数当て
- 20. pg_heartman とは
- 21. [nuko]$ LOG: loaded library "hartmanhook" LOG: database system was shut down at 2014-02-16 04:45:33 PST LOG: database system is ready to accept connections LOG: autovacuum launcher started [nuko]$ psql test psql (9.3.2) Type "help" for help. test=# SELECT 1; NOTICE: Sir, yes, sir! ?column? ---------- 1 (1 row) test=# d NOTICE: Sir, yes, sir! List of relations Schema | Name | Type | Owner --------+------+-------+-------- public | test | table | harada (1 row) test=# SQL を投げると ハートマン軍曹から 罵ってもらえます （現在実装中）
- 22. 実に くだらない
- 24. 時間が余ったら デモします
- 25. おしまい