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![9Copyright © 2015 NTT DATA Corporation
PostgreSQLにおけるJSON
CREATE TABLE hoge (data JSON);
INSERT INTO hoge VALUES ('
{"name" : "PostgreSQL",
"type" : "DBMS",
"developer" :
[{"name" : "Sawada", "age" : "25"},
{"name" : "Fujii", "age" : "55"}]}
');
SELECT data->'type',
((data->'developer')->1)->'name' FROM hoge;
?column? | ?column?
----------+----------
"DBMS" | "Fujii"
(1 row)](https://image.slidesharecdn.com/jsonbpostgresql95-150701063434-lva1-app6892/85/JSONB-PostgreSQL9-5-9-320.jpg)
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![1Copyright © 2015 NTT DATA Corporation
JSONBのGINインデックス
作成可能なGINインデックスは2種類
デフォルト
CREATE INDEX idx ON hoge USING gin (data);
jsonb_path_ops
CREATE INDEX idx ON hoge USING gin (data jsonb_path_ops);
@> only
Faster
Smaller index
演算子 説明 例
@> 「左辺のJSON」は「右辺のJSON」を包含するか？ {"a" : 1, "b" : 2} @> {"b" : 2}
? 右辺のキーが左辺のJSONに存在するか？ {"a" : 1, "b" : 2} ? 'b'
?& 右辺のキーのすべてが左辺のJSONに存在するか？ {"a" : 1, "b" : 2} ?& ARRAY['b', 'c']
?| 右辺のキーのいずれかが左辺のJSONに存在するか？ {"a" : 1, "b" : 2} ?| ARRAY['b', 'c']](https://image.slidesharecdn.com/jsonbpostgresql95-150701063434-lva1-app6892/85/JSONB-PostgreSQL9-5-12-320.jpg)
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![1Copyright © 2015 NTT DATA Corporation
jsonb_concat関数
SELECT jsonb_concat(
'{"a": 1, "b": "hoge"}'::jsonb,
'{"a": 999, "c": [1,2]}'::jsonb
);
jsonb_concat
--------------------------------------
{"a": 999, "b": "hoge", "c": [1, 2]}
(1 row)](https://image.slidesharecdn.com/jsonbpostgresql95-150701063434-lva1-app6892/85/JSONB-PostgreSQL9-5-19-320.jpg)
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![2Copyright © 2015 NTT DATA Corporation
jsonb_delete関数
SELECT jsonb_delete(
'{"a": 1, "b": {"c": 999}, "d": [2,3]}'::jsonb,
'a‘
);
jsonb_delete
--------------------------------
{"b": {"c": 999}, "d": [2, 3]}
(1 row)
SELECT jsonb_delete(
'{"a": 1, "b": {"c": 999}, "d": [2,3]}'::jsonb,
'{d, -1}‘
);
jsonb_delete
-------------------------------------
{"a": 1, "b": {"c": 999}, "d": [2]}
(1 row)](https://image.slidesharecdn.com/jsonbpostgresql95-150701063434-lva1-app6892/85/JSONB-PostgreSQL9-5-20-320.jpg)
![2Copyright © 2015 NTT DATA Corporation
jsonb_set関数 (ネストしたパス指定)
SELECT jsonb_set(
'{"a":{"b": 2}}'::jsonb,
'{a, b}',
'[1,2]‘
);
jsonb_set
----------------------
{"a": {"b": [1, 2]}}
(1 row)](https://image.slidesharecdn.com/jsonbpostgresql95-150701063434-lva1-app6892/85/JSONB-PostgreSQL9-5-22-320.jpg)
![2Copyright © 2015 NTT DATA Corporation
jsonb_set関数 (添字に負の数)
SELECT jsonb_set(
'{"a": {"b": [2,3]}}'::jsonb,
'{a, b, -1}',
'999‘
);
jsonb_set
------------------------
{"a": {"b": [2, 999]}}
(1 row)](https://image.slidesharecdn.com/jsonbpostgresql95-150701063434-lva1-app6892/85/JSONB-PostgreSQL9-5-23-320.jpg)
![2Copyright © 2015 NTT DATA Corporation
jsonb_pretty関数
SELECT jsonb_pretty('{"a":"hoge", "b":[1,2,3], "c":{"d": 999}}'::jsonb);
jsonb_pretty
------------------
{ +
"a": "hoge", +
"b": [ +
1, +
2, +
3 +
], +
"c": { +
"d": 999 +
} +
}
(1 row)](https://image.slidesharecdn.com/jsonbpostgresql95-150701063434-lva1-app6892/85/JSONB-PostgreSQL9-5-25-320.jpg)
![3Copyright © 2015 NTT DATA Corporation
検索機能の向上
例えば、配列がネストされた複雑なデータの場合。
SELECT jsonb_pretty(
‘{"department": [{"staff": [{"name": “hoge", "title": “chief”}]}]}’
);
jsonb_pretty
-------------------------------------
{ +
"department": [ +
{ +
“staff”: [ +
{ +
"name": “hoge", +
"title": “chief" +
} +
] +
} +
] +
}](https://image.slidesharecdn.com/jsonbpostgresql95-150701063434-lva1-app6892/85/JSONB-PostgreSQL9-5-33-320.jpg)
![3Copyright © 2015 NTT DATA Corporation
検索機能の向上
「name」がhoge、「title」がmanagerまたはchiefのデータを探そうとすると。。
SELECT
*
FROM
company
WHERE
jb->’department’->0->’staff’->0->’name’ = ‘hoge’ AND
(
jb->’department’->0->’staff’->0->’title’ = ‘manager’ OR
jb->’department’->0->’staff’->0->’title’ = ‘chief’
)
SELECT
*
FROM
company
WHERE
(
jb->’department’->0->’staff’->0->’name’ = ‘hoge’ AND
jb->’department’->0->’staff’->0->’title’ = ‘manager’
) OR
(
jb->’department’->0->’staff’->0->’name’ = ‘hoge’ AND
jb->’department’->0->’staff’->0->’title’ = ‘chief’
)
jsonb_pretty
-------------------------------------------
{ +
"department": [ +
{ +
“staff”: [ +
{ +
"name": “hoge", +
"title": “chief" +
} +
] +
} +
] +
}](https://image.slidesharecdn.com/jsonbpostgresql95-150701063434-lva1-app6892/85/JSONB-PostgreSQL9-5-34-320.jpg)
![3Copyright © 2015 NTT DATA Corporation
検索機能の向上
「name」がhoge、「title」がmanagerまたはchiefのデータを探そうとすると。。
SELECT
*
FROM
company as c
WHERE
EXISTS
(
SELECT
1
FROM
(
SELECT
jsonb_array_elements(t1.col1->’staff’) as col2
FROM
(
SELECT
jsonb_array_elements(jb->’department’) as col1
FROM
company
) as t1
) as t2
WHERE
t2.col2 ->> ‘name’ = ‘hoge’ AND
t2.col2 ->> ‘title’ IN (‘manager’, ‘chief’)
);
jsonb_pretty
-------------------------------------------
{ +
"department": [ +
{ +
“staff”: [ +
{ +
"name": “hoge", +
"title": “chief" +
} +
] +
} +
] +
}](https://image.slidesharecdn.com/jsonbpostgresql95-150701063434-lva1-app6892/85/JSONB-PostgreSQL9-5-35-320.jpg)
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JSONBはPostgreSQL9.5でいかに改善されたのか
MyNA・JPUG合同DB勉強会 in 東京 発表量 『JSONBはPostgreSQL9.5でいかに改善されたのか』
