Question

我正在尝试创建一个查询，其中我基于4个值搜索1个表。这些值都不是必需的，它应该基于所有这些值返回。

如果始终提供所有值，下面是我的处理方法。

CREATE OR REPLACE FUNCTION "GetValues"(
  "@value1"                TEXT,
  "@value2"                TEXT,
  "@value3"                TEXT
  "@value4"                TEXT
)
RETURNS TABLE(
  "id"                     UUID,
  "@value1"                TEXT,
  "@value2"                TEXT,
  "@value3"                TEXT
  "@value4"                TEXT  
) AS
$func$
BEGIN
  RETURN QUERY SELECT
    c."id",
    c."value1",
    c."value2",
    c."value3",
    c."value4"
  FROM "values" AS v
  WHERE "value1" = "@value1"
  AND "value2" = "@value2"
  AND "value3" = "@value3"
  AND "value4" = "@value4";
END;
$func$ LANGUAGE PLPGSQL;

以下是我的想象，但我无法在其中进行任何操作。

IF ("@value1" IS NOT NULL) THEN
  WHERE "value1" = "@value1"
END IF;

我应该做很多单独的选择，然后将它们全部与UNION结合吗？我认为这行不通，因为我只想显示符合所有条件的内容？

Answer 1

使用Google Cloud Function trigger

SELECT
    "id",
    "value1",
    "value2",
    "value3",
    "value4"
FROM "values"
WHERE "value1" = COALESCE("@value1", "value1")
AND "value2" = COALESCE("@value2", "value2")
AND "value3" = COALESCE("@value3", "value3")
AND "value4" = COALESCE("@value4", "value4")

COALESCE():

无关但重要。在双引号中使用表名或列名肯定会不会，使生活更加轻松。表的名称“值”可能被认为是不良做法。

根据多个参数搜索postgres表，但不需要全部

1 个答案: