turicas/rows

Optimize if output format is SQLite

Aperta

#217 aperta il 20 feb 2017

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Descrizione

If we run the following command:

rows query 'SELECT * FROM table1 WHERE field1="value1"' filename.sqlite --output=out.sqlite

the CLI will:

  • Connect to a SQLite database named filename.sqlite since there's only one source and it's format is SQLite
  • Import the SQLite result into a rows.Table running the query
  • Export the result rows.Table into a new SQLite database named out.sqlite

We can optimize this use case replacing the steps with the following:

  • Connect to a SQLite database named filename.sqlite since there's only one source and its format is SQLite
  • Attach the output database with SQLite's ATTACH SQL command
  • Change the query to have INSERT INTO (to add result to the new database)
  • Run the query

More details on ATTACH in StackOverflow this thread.

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