从jsonb[]行遍历和查询元素时遇到困难。
CREATE TABLE foo (
id uuid PRIMARY KEY,
work_experience jsonb[] NOT NULL
);
INSERT INTO foo (id, work_experience)
VALUES (
'b4e942a0-49b4-4fa7-8f7a-5fbf0541d1c9',
E'{"{\"id\": \"7cd74bae-ff5b-4f58-ab20-0218f820ffff\", \"skills\": [{\"id\": \"c8a5328d-87ba-419d-802f-80b1d940bb68|313384d2-486d-4b7f-ba33-76b1cd696f0a|fd3c41b8-8c15-47e2-a80d-cf3683b2d0da\", \"level1\": \"Programming languages\", \"level2\": \"Scripting languages\", \"level3\": \"TypeScript\", \"level1_id\": \"c8a5328d-87ba-419d-802f-80b1d940bb68\", \"level2_id\": \"313384d2-486d-4b7f-ba33-76b1cd696f0a\", \"level3_id\": \"fd3c41b8-8c15-47e2-a80d-cf3683b2d0da\"}, {\"id\": \"84dff39f-2ed6-408c-a188-14cf55a09c5b|e13b48c1-fd0f-4ecc-89de-58e9312b9435|686af7e4-6d58-4148-b227-3bf65ff10273\", \"level1\": \"Software frameworks & libraries\", \"level2\": \"Frontend frameworks & libraries\", \"level3\": \"React\", \"level1_id\": \"84dff39f-2ed6-408c-a188-14cf55a09c5b\", \"level2_id\": \"e13b48c1-fd0f-4ecc-89de-58e9312b9435\", \"level3_id\": \"686af7e4-6d58-4148-b227-3bf65ff10273\"}, {\"id\": \"84dff39f-2ed6-408c-a188-14cf55a09c5b|c4e54726-7bd5-44bb-8597-a05eb2272e2b|cda4441f-dba6-495c-9e2e-7429bd5e0465\", \"level1\": \"Software frameworks & libraries\", \"level2\": \"Backend frameworks & libraries\", \"level3\": \"Node.js\", \"level1_id\": \"84dff39f-2ed6-408c-a188-14cf55a09c5b\", \"level2_id\": \"c4e54726-7bd5-44bb-8597-a05eb2272e2b\", \"level3_id\": \"cda4441f-dba6-495c-9e2e-7429bd5e0465\"}, {\"id\": \"84dff39f-2ed6-408c-a188-14cf55a09c5b|e13b48c1-fd0f-4ecc-89de-58e9312b9435|fd3c41b8-8c15-47e2-a80d-cf3683b2d0da\", \"level1\": \"Software frameworks & libraries\", \"level2\": \"Frontend frameworks & libraries\", \"level3\": \"TypeScript\", \"level1_id\": \"84dff39f-2ed6-408c-a188-14cf55a09c5b\", \"level2_id\": \"e13b48c1-fd0f-4ecc-89de-58e9312b9435\", \"level3_id\": \"fd3c41b8-8c15-47e2-a80d-cf3683b2d0da\"}], \"end_date\": null, \"position\": \"Senior Software Engineer + Team Lead\", \"start_date\": \"2019-10-01T00:00:00\", \"description\": \"Draper, Utah, United States\\n• Architected Expert Portal* from the ground up using a Node/Typescript\\nbackend, a\\nPostgreSQL database, a GraphQL API layer, a Webpack build process, with a\\nTypescript/React front-end and XState for state management\\n• Enforced coding best practices with linting rules and code formatters by\\nautomating it in\\ngit workflow\\n• Automated deployment Expert Portal* to EC2 instances and the @pluralsight\\nNPM\\nartifactory using Github, TeamCity, and Octopus\\n• Improved product team workflow by building a browser extention to add\\nLeanKit card\\ntemplate functionality\\n• Consumed and published data through Kafka streams and RabbitMQ\\nmessages\\n• Interviewed, onboarded, and trained junior to mid-level engineers\", \"company_name\": \"Pluralsight\"}","{\"id\": \"9e2c2b44-39a4-4369-b237-c51fd938e61d\", \"skills\": [{\"id\": \"c8a5328d-87ba-419d-802f-80b1d940bb68|313384d2-486d-4b7f-ba33-76b1cd696f0a|012abcd1-3a6a-4803-a47e-42f46b402024\", \"level1\": \"Programming languages\", \"level2\": \"Scripting languages\", \"level3\": \"JavaScript\", \"level1_id\": \"c8a5328d-87ba-419d-802f-80b1d940bb68\", \"level2_id\": \"313384d2-486d-4b7f-ba33-76b1cd696f0a\", \"level3_id\": \"012abcd1-3a6a-4803-a47e-42f46b402024\"}], \"end_date\": \"2019-10-01T00:00:00\", \"position\": \"Software Engineer II\", \"start_date\": \"2017-11-01T00:00:00\", \"description\": \"Greater Salt Lake City Area\\nWorked on the KSL Jobs Classifieds team as a full-stack developer. Following\\nthe scrum methodology, I added new features and maintained all things\\npowered by KSL Jobs.\\n• Built and deployed a \\\"white label\\\" version of KSL Jobs for the Silicon Slopes\\nbrand. (https://siliconslopes.ksl.com)\\n• Rewrote major sections of the current KSL Jobs site in React.js\\n• Automated querying data for reports and analytic purposes through Node and\\nPHP scripts\\n• Provided rich data tracking through Google Tag Manager, Google Analytics,\\nand BigQuery\\n• Migrated Solr search engine to ElasticSearch with a GraphQL API\", \"company_name\": \"Deseret Digital Media\"}","{\"id\": \"efbf68f4-7bdc-4ab6-bba9-fbf7ec38aeef\", \"skills\": [{\"id\": \"c8a5328d-87ba-419d-802f-80b1d940bb68|f45abc59-1e7e-4853-a498-999fcf12d498|4b266297-6e25-4443-90ec-248bded4225a\", \"level1\": \"Programming languages\", \"level2\": \"High-level languages\", \"level3\": \"PHP\", \"level1_id\": \"c8a5328d-87ba-419d-802f-80b1d940bb68\", \"level2_id\": \"f45abc59-1e7e-4853-a498-999fcf12d498\", \"level3_id\": \"4b266297-6e25-4443-90ec-248bded4225a\"}], \"end_date\": \"2019-08-01T00:00:00\", \"position\": \"Full Stack Developer\", \"start_date\": \"2017-01-01T00:00:00\", \"description\": \"Provo, Utah Area\\nWorked with Appritech LLC to modernize their legacy software and add new\\nfeatures to automate their business processes.\\n• Building new call handler from the ground up using JavaScript ES6,\\nBootstrap, SASS for\\nfront-end, and PHP7/Laravel for back-end\\n• Implemented real-time call management system and built reporting API.\\nImproved call agent\\nproductivity by 70%\\n• Upgraded deprecated PHP legacy code to PHP 7\\n• Synchronized follow up calls with Twilio API functionality for SMS message\\nforwarding\\n• Installed and setup Apache server for an after hours call center\", \"company_name\": \"Appritech Software\"}","{\"id\": \"2db60c6c-c214-4d9b-9034-baba676203a8\", \"skills\": [{\"id\": \"c8a5328d-87ba-419d-802f-80b1d940bb68|f45abc59-1e7e-4853-a498-999fcf12d498|4b266297-6e25-4443-90ec-248bded4225a\", \"level1\": \"Programming languages\", \"level2\": \"High-level languages\", \"level3\": \"PHP\", \"level1_id\": \"c8a5328d-87ba-419d-802f-80b1d940bb68\", \"level2_id\": \"f45abc59-1e7e-4853-a498-999fcf12d498\", \"level3_id\": \"4b266297-6e25-4443-90ec-248bded4225a\"}], \"end_date\": \"2017-09-01T00:00:00\", \"position\": \"Web Developer\", \"start_date\": \"2017-02-01T00:00:00\", \"description\": \"Provo, Utah Area\\nWorked with Redcore LLC to build entrepreneurial tools, marketing tools, and\\nadding new functionality to the current Wordpress-integrated website and\\nCMS.\\n• Built Brand Management website from the ground up using Bootstrap and\\nJavaScript on the\\nfront end, with PHP and MySQL on the back-end\\n• Automated managerial and accounting tasks, such as invoice generation,\\nand transactions using Stripe API\\n• Debugged and perfected current web applications to enrich UX\\n• Doubled clientele by expanding Redcore services offered to include website\\ncreation and\\nmanagement\", \"company_name\": \"Redcore LLC\"}","{\"id\": \"c3f1d5b2-5586-477d-ae4c-e2927463244e\", \"skills\": [{\"id\": \"c8a5328d-87ba-419d-802f-80b1d940bb68|313384d2-486d-4b7f-ba33-76b1cd696f0a|012abcd1-3a6a-4803-a47e-42f46b402024\", \"level1\": \"Programming languages\", \"level2\": \"Scripting languages\", \"level3\": \"JavaScript\", \"level1_id\": \"c8a5328d-87ba-419d-802f-80b1d940bb68\", \"level2_id\": \"313384d2-486d-4b7f-ba33-76b1cd696f0a\", \"level3_id\": \"012abcd1-3a6a-4803-a47e-42f46b402024\"}], \"end_date\": \"2017-03-01T00:00:00\", \"position\": \"Software and Web Developer\", \"start_date\": \"2016-12-01T00:00:00\", \"description\": \"Provo, Utah Area\\nThis internship was focused on building core website and software for\\nCentaurific using the LAMP stack.\\n• Created dynamic landing pages for products to generate leads\\n• Designed a MySQL database to organize data and generate excel reports\\n• Revitalized marketing efforts through analytics and a social media sharing\\npage\", \"company_name\": \"Centaurific\"}"}'
);
(以下是JSON中work_experience行的样子：(
[
{
"id": "7cd74bae-ff5b-4f58-ab20-0218f820ffff",
"skills": [
{
"id": "c8a5328d-87ba-419d-802f-80b1d940bb68|313384d2-486d-4b7f-ba33-76b1cd696f0a|fd3c41b8-8c15-47e2-a80d-cf3683b2d0da",
"level1": "Programming languages",
"level2": "Scripting languages",
"level3": "TypeScript",
"level1_id": "c8a5328d-87ba-419d-802f-80b1d940bb68",
"level2_id": "313384d2-486d-4b7f-ba33-76b1cd696f0a",
"level3_id": "fd3c41b8-8c15-47e2-a80d-cf3683b2d0da"
},
{
"id": "84dff39f-2ed6-408c-a188-14cf55a09c5b|e13b48c1-fd0f-4ecc-89de-58e9312b9435|686af7e4-6d58-4148-b227-3bf65ff10273",
"level1": "Software frameworks & libraries",
"level2": "Frontend frameworks & libraries",
"level3": "React",
"level1_id": "84dff39f-2ed6-408c-a188-14cf55a09c5b",
"level2_id": "e13b48c1-fd0f-4ecc-89de-58e9312b9435",
"level3_id": "686af7e4-6d58-4148-b227-3bf65ff10273"
},
{
"id": "84dff39f-2ed6-408c-a188-14cf55a09c5b|c4e54726-7bd5-44bb-8597-a05eb2272e2b|cda4441f-dba6-495c-9e2e-7429bd5e0465",
"level1": "Software frameworks & libraries",
"level2": "Backend frameworks & libraries",
"level3": "Node.js",
"level1_id": "84dff39f-2ed6-408c-a188-14cf55a09c5b",
"level2_id": "c4e54726-7bd5-44bb-8597-a05eb2272e2b",
"level3_id": "cda4441f-dba6-495c-9e2e-7429bd5e0465"
},
{
"id": "84dff39f-2ed6-408c-a188-14cf55a09c5b|e13b48c1-fd0f-4ecc-89de-58e9312b9435|fd3c41b8-8c15-47e2-a80d-cf3683b2d0da",
"level1": "Software frameworks & libraries",
"level2": "Frontend frameworks & libraries",
"level3": "TypeScript",
"level1_id": "84dff39f-2ed6-408c-a188-14cf55a09c5b",
"level2_id": "e13b48c1-fd0f-4ecc-89de-58e9312b9435",
"level3_id": "fd3c41b8-8c15-47e2-a80d-cf3683b2d0da"
}
],
"end_date": null,
"position": "Senior Software Engineer + Team Lead",
"start_date": "2019-10-01T00:00:00",
"description": "Draper, Utah, United Statesn• Architected Expert Portal* from the ground up using a Node/Typescriptnbackend, anPostgreSQL database, a GraphQL API layer, a Webpack build process, with anTypescript/React front-end and XState for state managementn• Enforced coding best practices with linting rules and code formatters bynautomating it inngit workflown• Automated deployment Expert Portal* to EC2 instances and the @pluralsightnNPMnartifactory using Github, TeamCity, and Octopusn• Improved product team workflow by building a browser extention to addnLeanKit cardntemplate functionalityn• Consumed and published data through Kafka streams and RabbitMQnmessagesn• Interviewed, onboarded, and trained junior to mid-level engineers",
"company_name": "Pluralsight"
},
{
"id": "9e2c2b44-39a4-4369-b237-c51fd938e61d",
"skills": [
{
"id": "c8a5328d-87ba-419d-802f-80b1d940bb68|313384d2-486d-4b7f-ba33-76b1cd696f0a|012abcd1-3a6a-4803-a47e-42f46b402024",
"level1": "Programming languages",
"level2": "Scripting languages",
"level3": "JavaScript",
"level1_id": "c8a5328d-87ba-419d-802f-80b1d940bb68",
"level2_id": "313384d2-486d-4b7f-ba33-76b1cd696f0a",
"level3_id": "012abcd1-3a6a-4803-a47e-42f46b402024"
}
],
"end_date": "2019-10-01T00:00:00",
"position": "Software Engineer II",
"start_date": "2017-11-01T00:00:00",
"description": "Greater Salt Lake City AreanWorked on the KSL Jobs Classifieds team as a full-stack developer. Followingnthe scrum methodology, I added new features and maintained all thingsnpowered by KSL Jobs.n• Built and deployed a "white label" version of KSL Jobs for the Silicon Slopesnbrand. (https://siliconslopes.ksl.com)n• Rewrote major sections of the current KSL Jobs site in React.jsn• Automated querying data for reports and analytic purposes through Node andnPHP scriptsn• Provided rich data tracking through Google Tag Manager, Google Analytics,nand BigQueryn• Migrated Solr search engine to ElasticSearch with a GraphQL API",
"company_name": "Deseret Digital Media"
},
{
"id": "efbf68f4-7bdc-4ab6-bba9-fbf7ec38aeef",
"skills": [
{
"id": "c8a5328d-87ba-419d-802f-80b1d940bb68|f45abc59-1e7e-4853-a498-999fcf12d498|4b266297-6e25-4443-90ec-248bded4225a",
"level1": "Programming languages",
"level2": "High-level languages",
"level3": "PHP",
"level1_id": "c8a5328d-87ba-419d-802f-80b1d940bb68",
"level2_id": "f45abc59-1e7e-4853-a498-999fcf12d498",
"level3_id": "4b266297-6e25-4443-90ec-248bded4225a"
}
],
"end_date": "2019-08-01T00:00:00",
"position": "Full Stack Developer",
"start_date": "2017-01-01T00:00:00",
"description": "Provo, Utah AreanWorked with Appritech LLC to modernize their legacy software and add newnfeatures to automate their business processes.n• Building new call handler from the ground up using JavaScript ES6,nBootstrap, SASS fornfront-end, and PHP7/Laravel for back-endn• Implemented real-time call management system and built reporting API.nImproved call agentnproductivity by 70%n• Upgraded deprecated PHP legacy code to PHP 7n• Synchronized follow up calls with Twilio API functionality for SMS messagenforwardingn• Installed and setup Apache server for an after hours call center",
"company_name": "Appritech Software"
},
{
"id": "2db60c6c-c214-4d9b-9034-baba676203a8",
"skills": [
{
"id": "c8a5328d-87ba-419d-802f-80b1d940bb68|f45abc59-1e7e-4853-a498-999fcf12d498|4b266297-6e25-4443-90ec-248bded4225a",
"level1": "Programming languages",
"level2": "High-level languages",
"level3": "PHP",
"level1_id": "c8a5328d-87ba-419d-802f-80b1d940bb68",
"level2_id": "f45abc59-1e7e-4853-a498-999fcf12d498",
"level3_id": "4b266297-6e25-4443-90ec-248bded4225a"
}
],
"end_date": "2017-09-01T00:00:00",
"position": "Web Developer",
"start_date": "2017-02-01T00:00:00",
"description": "Provo, Utah AreanWorked with Redcore LLC to build entrepreneurial tools, marketing tools, andnadding new functionality to the current Wordpress-integrated website andnCMS.n• Built Brand Management website from the ground up using Bootstrap andnJavaScript on thenfront end, with PHP and MySQL on the back-endn• Automated managerial and accounting tasks, such as invoice generation,nand transactions using Stripe APIn• Debugged and perfected current web applications to enrich UXn• Doubled clientele by expanding Redcore services offered to include websitencreation andnmanagement",
"company_name": "Redcore LLC"
},
{
"id": "c3f1d5b2-5586-477d-ae4c-e2927463244e",
"skills": [
{
"id": "c8a5328d-87ba-419d-802f-80b1d940bb68|313384d2-486d-4b7f-ba33-76b1cd696f0a|012abcd1-3a6a-4803-a47e-42f46b402024",
"level1": "Programming languages",
"level2": "Scripting languages",
"level3": "JavaScript",
"level1_id": "c8a5328d-87ba-419d-802f-80b1d940bb68",
"level2_id": "313384d2-486d-4b7f-ba33-76b1cd696f0a",
"level3_id": "012abcd1-3a6a-4803-a47e-42f46b402024"
}
],
"end_date": "2017-03-01T00:00:00",
"position": "Software and Web Developer",
"start_date": "2016-12-01T00:00:00",
"description": "Provo, Utah AreanThis internship was focused on building core website and software fornCentaurific using the LAMP stack.n• Created dynamic landing pages for products to generate leadsn• Designed a MySQL database to organize data and generate excel reportsn• Revitalized marketing efforts through analytics and a social media sharingnpage",
"company_name": "Centaurific"
}
]
我想查询一下结构。我尝试了这个和其他一些变体，但都无济于事：
SELECT workexp
FROM foo,
jsonb_array_elements(work_experience) workexp;
我收到了这个错误消息：
ERROR: function jsonb_array_elements_text(jsonb[]) does not exist
LINE 3: jsonb_array_elements(work_experience) workexp;
^
HINT: No function matches the given name and argument types. You might need to add explicit type casts.
我查找的所有内容都有关于遍历和查询jsonb行的文档，但没有关于jsonb[]行的文档。我如何查询"；技能"id"；s
编辑--解决方案：所有给出的解决方案都很有帮助，但我选择Ramin Faracov建议使用unnest。非常感谢。
这是我提出的问题：
SELECT
id expert_id,
we_sk->>'id' work_exp_skill_id
FROM (
SELECT
id,
unnest(work_experience)->'skills' we
FROM foo_json
) sk,
jsonb_array_elements(sk.we) we_sk;
在PostgreSQL中，所有jsonb array functions仅用于使用JSONB类型，而不是JSONB[]。
-
第一种方法是使用
unnest函数将数组转换为行，然后使用jsonb_array_elements。 -
第二种方法是将表中的类型
JSONB[]更改为JSON。不用担心，您仍然可以将上面写的JSON字符串数据插入到JSONB字段中，而不会出现任何问题。在JSON和JSONB字符串中，我们可以使用格式化字符串的数组。Jsonb array functions仅适用于在JSON字符串中写入的数组。
db fiddle演示。
- 您不需要
jsonb[]，只需使用jsonb即可 - 您需要正确地重新格式化jsonb，以便可以插入到postgresql中。我使用datagrip语法高亮显示将代码重新格式化为数据库。像这样
- CTE更容易重新格式化逻辑。所以我用它
-先查询过滤器主id，然后查询内部id。--"；84dff39f-2ed6-408c-a188-14cf55a09c5b|e13b48c1-fd0f-4cc-89de-58e9312b9435|fd3c41b8-8c15-47e2-a80d-cf3683b2d0da"；
with a as (
SELECT workexp
FROM foo_json,
jsonb_array_elements(work_experience) workexp),
b as(select workexp['id'] mainid,
jsonb_array_elements(workexp['skills']) last_level,
count(*) over() from a),
c as(select
last_level,
pg_typeof(mainid) from b
where mainid::text = '"7cd74bae-ff5b-4f58-ab20-0218f820ffff"'::text)
select *,
last_level['level1'],
last_level['level2'],
last_level['level3'],
last_level['level1_id'],
last_level['level2_id'],
last_level['level3_id']
from c
where
last_level['id']::text
= '"84dff39f-2ed6-408c-a188-14cf55a09c5b|e13b48c1-fd0f-4ecc-89de-58e9312b9435|fd3c41b8-8c15-47e2-a80d-cf3683b2d0da"'::text;
--基于mainid(而非内部嵌套(的查询过滤器
with a as (
SELECT workexp
FROM foo_json,
jsonb_array_elements(work_experience) workexp),
b as(select workexp['id'] mainid, workexp['skills'], count(*) over() from a)
select *, pg_typeof(mainid) from b
where mainid::text = '"7cd74bae-ff5b-4f58-ab20-0218f820ffff"'::text;
postgresql15(dev(
在postgresql15中，存在json_table。使嵌套的json/jsonb查询更加容易。
SELECT jt.* FROM foo_json,
JSON_TABLE(work_experience, '$[*]' COLUMNS(
main_id text path '$.id', start_date date path '$.start_date',
position text path '$.position', company_name text path '$.company_name',
NESTED PATH '$.skills[*]' COLUMNS (
innerid text path '$.id',
level2 text, level3 text)
)) jt;