arrays - 从 postgres 中的对象数组插入唯一值

Question

我一直在尝试从一组对象中将一组唯一代码输入到 postgres 中。这是我到目前为止所拥有的，但它在 INTO 附近一直失败。我之前尝试过循环版本，但它从来没有插入任何东西，但也不会产生错误。下面是理想的批量插入，不需要任何 FOR 循环。

CREATE OR REPLACE FUNCTION "InsertCodes" (
  "@codes"                  JSONB,
  "@type"                   TEXT
)
RETURNS void AS
$func$
DECLARE "id"                UUID;
BEGIN
  "id" = uuid_generate_v4();
  SELECT * FROM (
    SELECT *
    FROM jsonb_array_elements("@codes")
  ) AS c (
-- fails below
    INSERT INTO
      "codes" (
        "id",
        "code",
        "name",
        "type"
      )
    VALUES (
      "id",
      c."code",
      c."name",
      "@type"
    );
    ON CONSTRAINT ("code")
    DO NOTHING
    RETURNING 1;
  );
END;
$func$ LANGUAGE PLPGSQL;

@codes 如下所示:

[
  {
    "code": 1234,
    "name": "numeric"
  },
  {
    "code": "1k1l2k",
    "name": "alphanumeric"
  }
]

Answer 1

查询应该如下所示:

"id" = uuid_generate_v4();
INSERT INTO "codes" ("id", "code", "name", "type")
SELECT "id", item->>'code', item->>'name', "@type"
FROM jsonb_array_elements("@codes") AS item
ON CONFLICT ("code") DO NOTHING;

请注意，对于作为 jsonb 数组传递的所有代码，将插入相同的 "id"。如果它是主键，您应该为每个代码单独生成 "id":

INSERT INTO "codes" ("id", "code", "name", "type")
SELECT uuid_generate_v4(), item->>'code', item->>'name', "@type"
FROM jsonb_array_elements("@codes") AS item
ON CONFLICT ("code") DO NOTHING;