直接用 SQLite 查詢 Excel 檔案的 XLite (還有 dsq)

Hacker News 上看到「Xlite: Query Excel and Open Document spreadsheets as SQLite virtual tables (github.com/x2bool)」這個專案,就如同說明,是一個支援讀取 Excel 檔案的 SQLite extension,原網站在 x2bool/xlite 這邊。

依照說明支援舊的 .xls 與新的 .xlsx 的格式,但不知道公式運算支援到什麼程度...

先 load extension:

sqlite3 # will open SQLite CLI
> .load libxlite

接著是建立 virtual table:

CREATE VIRTUAL TABLE class_data USING xlite(
    FILENAME './path/to/example.xlsx',
    WORKSHEET 'Class Data',
    RANGE 'A2:F'
);

接下來就可以搞事了:

SELECT COUNT(*), D FROM class_data GROUP BY D ORDER BY COUNT(*);

看起來是用 Rust + C 寫的,然後作者有提醒這是寫興趣的專案:

This project is experimental, use at your own risk. The project is developed in my free time as a way to learn Rust and database systems.

反倒是 Hacker News 討論串裡面提到了 multiprocessio/dsq 這個專案,看起來發展的比較久,支援度也比較完整了:

Commandline tool for running SQL queries against JSON, CSV, Excel, Parquet, and more

不過就不是綁 SQLite 了 (雖然還是有關),從範例可以看到他是獨立的程式:

$ dsq testdata.json "SELECT * FROM {} WHERE x > 10"

Under the hood dsq uses DataStation as a library and under that hood DataStation uses SQLite to power these kinds of SQL queries on arbitrary (structured) data.

如果是真的要用的話,這套看起來應該會好一些...

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