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OnConflict implementation for SQLite provider uses wrong feature of SQLite

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#796 3 則留言 0 個 reaction 已指派 0 人 在 GitHub 檢視

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評估

難度
4/5
預估耗時
3-5 天
新手友好度
35/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
停滯
技術堆疊
fsharp, sqlite
領域
databases

研究方向

該 issue 沒有列出檔案或測試;首先定位 SQLite provider 目前的 OnConflict 實作,並閱讀連結的 SQLite ON CONFLICT 與 UPSERT 文件。將其行為與其他受支援 provider 的行為以及回報的 NOT NULL 情況進行比較。當選定的 SQLite 行為或其文件化的警告取得共識並完成實作,同時考量向後相容性時,即視為完成。

由索引模型根據 Issue 內容生成。

描述

sqlite

Describe the bug
I think that implementation of OnConflict uses wrong feature of SQLite.
If you check the SQLite docs mentioned in https://fsprojects.github.io/SQLProvider/core/crud.html#OnConflict you'll see that "ON CONFLICT clause applies to UNIQUE, NOT NULL, CHECK, and PRIMARY KEY constraints".
SQLite has another feature, specifically for UPSERTs - https://sqlite.org/lang_upsert.html . Docs for that feature mention that "UPSERT in SQLite follows the syntax established by PostgreSQL, with generalizations."

I don't know why this feature of SQLite was chosen back in the day. Even though ON CONFLICT was available in SQLite for decades and UPSERT was only added at 2018, when this feature was added to SQLProvider UPSERT had already been available.
Nevertheless, I think it's quite confusing. Behavior of this feature for SQLite is different from other supported providers. I suppose we have two options:

  1. Fix SQLProvider implementation to use proper UPSERTS for SQLite, probably adding a configuration toggle somewhere to enable backward compatibility.
  2. Add a warning to the docs stating that usage of OnConflict feature for SQLite has a broader scope than one could expect.

In my case, I set OnConflict.Ignore to one of my tables, expecting it to only deal with primary key violations.
In the meantime, I had an error in my app, one of the non-null column hasn't been filled, but SQLite hasn't complained about it and just silently refused to insert a row into a table. At the end, by debugging raw sql I was able to figure things out.

主要語言
F#
星號
627
分支
148
平均合併
2 小時 2 分鐘
30 天內合併 PR
1

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