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igalklebanov avatar igalklebanov commented on May 25, 2024

Hey 👋

For INSERT ... ON DUPLICATE KEY UPDATE statements, the affected-rows value per row is 1 if the row is inserted as a new row, 2 if an existing row is updated, and 0 if an existing row is set to its current values.
https://dev.mysql.com/doc/c-api/8.3/en/mysql-affected-rows.html

numInsertedOrUpdatedRows holds the number of (actually) inserted rows. On MySQL, updated rows are counted twice when using on duplicate key update.
https://kysely-org.github.io/kysely-apidoc/classes/InsertResult.html

from kysely.

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