Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1sOGAP-00DIzk-A9 for pgsql-general@arkaria.postgresql.org; Mon, 01 Jul 2024 12:29:57 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.94.2) (envelope-from ) id 1sOGAM-001OEN-Fs for pgsql-general@arkaria.postgresql.org; Mon, 01 Jul 2024 12:29:54 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1sOGAM-001OEF-1e for pgsql-general@lists.postgresql.org; Mon, 01 Jul 2024 12:29:54 +0000 Received: from mail-ej1-x633.google.com ([2a00:1450:4864:20::633]) by makus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94.2) (envelope-from ) id 1sOGAJ-0041pw-MT for pgsql-general@lists.postgresql.org; Mon, 01 Jul 2024 12:29:53 +0000 Received: by mail-ej1-x633.google.com with SMTP id a640c23a62f3a-a7194ce90afso327229866b.2 for ; Mon, 01 Jul 2024 05:29:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cybertec-at.20230601.gappssmtp.com; s=20230601; t=1719836990; x=1720441790; darn=lists.postgresql.org; h=mime-version:user-agent:content-transfer-encoding:autocrypt :references:in-reply-to:date:to:from:subject:message-id:from:to:cc :subject:date:message-id:reply-to; bh=32Xj1c6cgyBVk18qMmOBx5s3v3iJ/1NMmEIYLXU1Egc=; b=IM3MgrmlM/OOS4qtdqqgGTW1jqv02hrw5mPaVcWn1rU1DPeyJne7VPXZzi+btRCRLG 0TmeqL7R5I5JP6owuGzEcFJi1gUYN4OAZeE0M0gubY3PgjqNldOKd0M+0l4Nk7vK+RvX f88hAd5zBncEusyi/OVoYiHZL/u8z7bRPXpR37asc9jlCsSc2MqKV77Kacn5bSifzVoh 1cLFez7vW+azU6CPnKc1FQLEEGYxzUETiGRb4gYRNqPr+I4kYTxGzIK8T56vYGCVC1Yi sPD4EIMSSik+bHJMiaDglzadXPk8UMcauKzzx/EUI5e5VfyAMwVl9O5L0USfvYJQeOiL KKLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719836990; x=1720441790; h=mime-version:user-agent:content-transfer-encoding:autocrypt :references:in-reply-to:date:to:from:subject:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=32Xj1c6cgyBVk18qMmOBx5s3v3iJ/1NMmEIYLXU1Egc=; b=b5YgMvHwvMPoH32Zh7/g1vcb1neolV+rVc8AVJqBA7mZtn5fE3Xqz7wryWdWTyxY6y 4o8M9CIXR7Z0O9xaxdoACyXxFAKBGcUYvLLiW97lK1BK5CGowblHigR3xI/gCpSvWfor v0m3Wdp7czjjCv0NP4ZDGutQ8ETdN08IEiOAgHF09OktUcWzUZ0gGlGbJxAF+Zg7fUbM mdnSTNnFvhDUGkz76JYFsJiRkeh3flaX/PsU12sASTUQIBH5MvExFS/LHzpEvdHKH8J+ t7J+LSo5zIJCIc+k+dVgrxB1VEhF03H1znhiVZWYY5fT8uT1TrshHnQSpmP+ryZFhxwz CI8g== X-Forwarded-Encrypted: i=1; AJvYcCV5y2cenzdeVBV6NKN3byg5/CfcRdxO+So0oYba6YAMIJr701m/qnF2RLWqs9P0qUPtd6SjEnDarYcFDHRUBtPbX8jx6KOwR93BTtpJELf+7H6X X-Gm-Message-State: AOJu0YzDO+g199nYLenJt16qMkQeAQTOnQnuNB7HmXt7kezoirevwitH eNH3R2AqWLhWtoGwEo2cXWwh3846QAaLN5/pSGarMIOVDZ3kF4OdVcUrdoyAl48= X-Google-Smtp-Source: AGHT+IFC89rdX+lPLNvxsVGytK3CxNCW05HlL9izGU3OP02u65bP8drLrPankphLpq1R+jzPhF2Hgw== X-Received: by 2002:a17:906:e2d0:b0:a72:54cd:cff with SMTP id a640c23a62f3a-a75144958d7mr374886266b.52.1719836989828; Mon, 01 Jul 2024 05:29:49 -0700 (PDT) Received: from localhost.localdomain ([2001:871:5e:39a5:f244:3f01:d160:93bb]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a72ab0b56absm329886166b.197.2024.07.01.05.29.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Jul 2024 05:29:49 -0700 (PDT) Message-ID: Subject: Re: MVCC: Using function doing INSERT and returning PK in WHERE clause of SELECT statement From: Laurenz Albe To: Dominique Devienne , pgsql-general@lists.postgresql.org Date: Mon, 01 Jul 2024 14:29:48 +0200 In-Reply-To: References: Autocrypt: addr=laurenz.albe@cybertec.at; prefer-encrypt=mutual; keydata=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 bT5UrLvJ2jb99bA9QARzhFaxzyn0F/BUKzuIjRGNs/n6d5dNUFA0kOt8sX+TacmC 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 lDrT4wxdLJ/XCdbPPAyl+lZtOLsaHEEZvYNyTXwZc35dVf3R4/oz20HoG6s7ct8e1 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 36UMAx4ulWMyqJajLNGY0DdG8qIsR5nxRhrnK/mrCidZ8F9/D3bWAl4rjtHlsztN59 +AnW5l0HsQcY9ntFL/zEBOaonjdJf Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) MIME-Version: 1.0 List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk On Mon, 2024-07-01 at 10:33 +0200, Dominique Devienne wrote: > INSERT'ing a new row is wrapped in a DEFINER function, > that returns the newly inserted row's OK (and integral ID). >=20 > And in the code calling that function, I was >=20 > SELECT * FROM table WHERE ID =3D insert_row_via_func(....) >=20 > to "save a round trip", combining the insertion and the select. > But of course, it didn't work, and in hindsight, the SCN for the > SELECT is chosen before the INSERT done inside the function, > so the new row is not seen, and the select returns nothing. >=20 > Is my analysis correct? In terms of the problem? > And the solutions / work-arounds? That looks corrent. Just define the function as RETURNS "table" and use INSERT ... RETURNING * Yours, Laurenz Albe