如何在 postgresql 函数中将数组插入表中？

Question

我在函数中收到了一个 jsonb，我需要在不同的行中插入

{
"client":"12345678",
"documents": ["0ca15b8f-c7b3-4a36-931b-e3faf6eaa571",
            "597c18e5-10d4-4656-a256-108e9674c3aa",
            "68056dfc-9799-4baf-b26b-4336586a5a2e"]
}

目前我正在测试：

CREATE OR REPLACE FUNCTION tribal.fn_add_documents(spec jsonb)
 RETURNS json
 LANGUAGE plpgsql
AS $function$
    begin
        INSERT INTO documents (id_document) 
            SELECT * FROM json_array_elements(spec->'documents'::json);
        return ('{"code" : "200"}'::jsonb);
    END;
$function$;

我希望有这样的结果

client	id_document
12345678	0ca15b8f-c7b3-4a36-931b-e3faf6eaa571
12345678	597c18e5-10d4-4656-a256-108e9674c3aa
12345678	68056dfc-9799-4baf-b26b-4336586a5a2e

id_document 是一个 UUID 类型

Answer 1

欢迎来到 SO。

我不确定你的问题是否正确，但如果你只是想取消嵌套 jsonb 数组并重复客户端 ID，只需执行以下操作

SELECT 
  spec->>'client' AS client,
  (jsonb_array_elements(spec->'documents')->>0)::uuid AS id_document

演示：db<>fiddle

WITH j (spec) AS ( VALUES
  ('{"client":"12345678",
  "documents": ["0ca15b8f-c7b3-4a36-931b-e3faf6eaa571",
            "597c18e5-10d4-4656-a256-108e9674c3aa",
            "68056dfc-9799-4baf-b26b-4336586a5a2e"]
  }'::jsonb)
)
SELECT 
  spec->>'client' AS client,
  (jsonb_array_elements(spec->'documents')->>0)::uuid AS id_document
FROM j;

  client  |             id_document              
----------+--------------------------------------
 12345678 | 0ca15b8f-c7b3-4a36-931b-e3faf6eaa571
 12345678 | 597c18e5-10d4-4656-a256-108e9674c3aa
 12345678 | 68056dfc-9799-4baf-b26b-4336586a5a2e

如您所见，没有必要为此编写 PL/pgSQL 函数，但如果必须，它的外观如下：

CREATE OR REPLACE FUNCTION tribal.fn_add_documents(spec jsonb)
 RETURNS json
 LANGUAGE plpgsql
AS $$
BEGIN
  INSERT INTO documents (client,id_document) 
  SELECT spec->>'client',
  (jsonb_array_elements(spec->'documents')->>0)::uuid;
RETURN('{"code" : "200"}'::jsonb);
END; $$;