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Postgresql JSON對象和數(shù)組查詢功能實現(xiàn)

 更新時間:2023年11月13日 16:04:00   作者:wnfee  
這篇文章主要介紹了Postgresql JSON對象和數(shù)組查詢功能實現(xiàn),本文給大家介紹的非常詳細,對大家的學習或工作具有一定的參考借鑒價值,需要的朋友參考下吧

一. Postgresql 9.5以下版本

1.1 簡單查詢(缺陷:數(shù)組必須指定下標,不推薦)

1.1.1 模糊查詢

SELECT  * FROM "public"."tf_low_data_testUser" WHERE  "address" #>> '{0,name}' like '%bb%'

address字段是JSONArray類型,所以在路徑中,使用數(shù)字索引來訪問數(shù)組元素,從 0 開始計數(shù)。

1.1.2 等值匹配

SELECT  * FROM "public"."tf_low_data_testUser" WHERE "address" #>> '{0,name}' = 'bbb'

如果字段是int類型,后面需要添加::int

1.1.3 時間搜索

SELECT  * FROM "public"."tf_low_data_testUser" WHERE  "address" #>> '{0,date}' BETWEEN '2023-08-13' AND '2023-08-17'

1.1.4 在列表

SELECT  * FROM "public"."tf_low_data_testUser" WHERE  "address" #>> '{0,name}' IN ('bbb','ccc')

1.1.5 包含

SELECT  * FROM "public"."tf_low_data_testUser" WHERE "address" #> '{0,roles,0,roleUsers}' @> '["eee"]'
#>:獲取在指定路徑的 JSON 對象,路徑不存在則返回空。返回類型是json(b)#>>:獲取在指定路徑的 JSON 對象,路徑不存在則返回空。返回類型是text

1.2 多層級JSONArray(推薦)

如果表中有一個字段posts,數(shù)據(jù)結構為

[{
	"name": "aaa",
	"ports": [{
		"port": 443,
		"nickname": "ggg",
		"date": "2023-08-29",
		"address": ["111", "222"]
	}, {
		"port": 80,
		"nickname": "fff",
		"date": "2022-08-29",
		"address": ["333", "444"]
	}]
}, {
	"name": "bbb",
	"ports": [{
		"port": 2443,
		"nickname": "hhh",
		"date": "2021-08-29",
		"address": ["999"]
	}, {
		"port": 280,
		"nickname": "jjj",
		"date": "2020-08-29",
		"address": ["111111"]
	}]
}]

1.2.1 模糊查詢

查詢nickname like '%jj%'

可以看出有兩層JSONArray結構

SELECT * FROM "public"."tf_low_data_testUser" WHERE EXISTS (
  SELECT 1
  FROM jsonb_array_elements("ports") as arr1(obj1) 
	CROSS JOIN jsonb_array_elements(obj1->'ports') as arr2(obj2)
  WHERE (obj2->>'nickname') like '%gg%'
);

當該層級類型是數(shù)組就添加CROSS JOIN jsonb_array_elements(obj1->'ports') as arr2(obj2)

1.2.2 模糊查詢 NOT

SELECT * FROM "public"."tf_low_data_testUser" WHERE NOT EXISTS (
  SELECT 1
  FROM jsonb_array_elements("ports") as arr1(obj1) 
	CROSS JOIN jsonb_array_elements(obj1->'ports') as arr2(obj2)
  WHERE (obj2->>'nickname') like '%gg%'
);

查的是另外三條數(shù)據(jù)源

1.2.3 等值匹配

SELECT * FROM "public"."tf_low_data_testUser" WHERE EXISTS (
  SELECT 1
  FROM jsonb_array_elements("ports") as arr1(obj1) 
	CROSS JOIN jsonb_array_elements(obj1->'ports') as arr2(obj2)
  WHERE (obj2->>'port')::int = 80
);

如果是數(shù)字類型后面需要轉換 ::int,因為 ->> 操作符的返回類型是 text

1.2.4 等值匹配 NOT

SELECT * FROM "public"."tf_low_data_testUser" WHERE NOT EXISTS (
  SELECT 1
  FROM jsonb_array_elements("ports") as arr1(obj1) 
	CROSS JOIN jsonb_array_elements(obj1->'ports') as arr2(obj2)
  WHERE (obj2->>'port')::int = 80
);

查的是另外三條數(shù)據(jù)源

1.2.5 時間搜索

SELECT * FROM "public"."tf_low_data_testUser" WHERE EXISTS (
  SELECT 1
  FROM jsonb_array_elements("ports") as arr1(obj1) 
	CROSS JOIN jsonb_array_elements(obj1->'ports') as arr2(obj2)
  WHERE (obj2->>'date') BETWEEN '2022-08-13' AND '2023-08-17'
);

1.2.6 時間搜索 NOT

查的是另外三條數(shù)據(jù)源

1.2.7 在列表

SELECT * FROM "public"."tf_low_data_testUser" WHERE EXISTS (
  SELECT 1
  FROM jsonb_array_elements("ports") as arr1(obj1) 
	CROSS JOIN jsonb_array_elements(obj1->'ports') as arr2(obj2)
  WHERE (obj2->>'nickname') IN ('ggg','fff')
);

1.2.8 在列表 NOT

查的是另外三條數(shù)據(jù)源

1.2.9 包含

SELECT * FROM "public"."tf_low_data_testUser" WHERE EXISTS (
  SELECT 1
  FROM jsonb_array_elements("ports") as arr1(obj1) 
	CROSS JOIN jsonb_array_elements(obj1->'ports') as arr2(obj2)
  WHERE (obj2->'address') @> '["444"]'
);

此時使用的操作符是->,返回值是jsonb類型

1.2.10 包含 NOT

查的是另外三條數(shù)據(jù)源

二. Postgresql 9.5和以上版本

也兼容上面的JSON查詢

2.1 模糊查詢

使用函數(shù)jsonb_path_exists(可以指定JSON路徑,如果是數(shù)組添加[*])的正則查詢達到模糊查詢的效果

-- like '%ggg%'
SELECT * FROM "public"."tf_low_data_testUser" WHERE jsonb_path_exists("ports", '$[*].ports[*].nickname ?(@ like_regex "g")')
-- 左模糊 like '%g'
SELECT * FROM "public"."tf_low_data_testUser" WHERE jsonb_path_exists("ports", '$[*].ports[*].nickname ?(@ like_regex "g$")')
-- 右模糊 like 'g%'
SELECT * FROM "public"."tf_low_data_testUser" WHERE jsonb_path_exists("ports", '$[*].ports[*].nickname ?(@ like_regex "^g")')
-- 等值匹配
SELECT * FROM "public"."tf_low_data_testUser" WHERE jsonb_path_exists("ports", '$[*].ports[*].nickname ?(@ like_regex "^ggg$")')

同樣支持NOT

2.2 等值匹配

SELECT * FROM "public"."tf_low_data_testUser" WHERE jsonb_path_exists("ports", '$[*].ports[*].nickname ?(@ == "fff")')

同樣支持NOT

2.3 時間搜索

SELECT * FROM "public"."tf_low_data_testUser" WHERE jsonb_path_exists("ports", '$[*].ports[*].date ?(@ >= "2022-01-02" && @ <= "2023-08-02")')

同樣支持NOT

2.4 在列表

SELECT * FROM "public"."tf_low_data_testUser" WHERE jsonb_path_exists("ports", '$[*].ports[*].nickname ?(@ == "ggg" || @ == "fff")')

同樣支持NOT

2.5 包含

等值匹配一樣

SELECT * FROM "public"."tf_low_data_testUser" WHERE jsonb_path_exists("ports", '$[*].ports[*].address ?(@ == "222")')

同樣支持NOT

到此這篇關于Postgresql JSON對象和數(shù)組查詢的文章就介紹到這了,更多相關Postgresql JSON對象內容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家!

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