Drizzle Team•9mo ago

Correct way of handling upserts in MySql

Hey folks! I am using MySql and cannot use onConflictDoUpdate. In leu of that I am wondering if this is a correct way of doing upserts

const updated = await db
  .update(...)
  .set(...)
  .where(eq(..))

// If no rows updated, create new row
if (updated[0].affectedRows === 0) {
  await db.insert(...).values(...)
}

const updated = await db
  .update(...)
  .set(...)
  .where(eq(..))

// If no rows updated, create new row
if (updated[0].affectedRows === 0) {
  await db.insert(...).values(...)
}

In my use case this record is going to be created once and then updated several times.

3 Replies

D1e•9mo ago

Have just started using drizzle and my first take was this:

const result = await db
        .insert(examples)
        .values(input)
        .onDuplicateKeyUpdate({
          set: { ...input },
        });

const updated = {
  id: result[0].insertId || (input.id as number),
};
return updated;

const result = await db
        .insert(examples)
        .values(input)
        .onDuplicateKeyUpdate({
          set: { ...input },
        });

const updated = {
  id: result[0].insertId || (input.id as number),
};
return updated;

chronos•9mo ago

Oh cool, I seemed to have missed onDuplicateKeyUpdate. Ill try that and see. Thanks! Thank you so much this works perfectly!

D1e•9mo ago

Awesome:) It is a little bit oversimplified, but I guess as long as you do simple data update operations and validate your input schemas with something like zod, it should be fairly safe.

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Correct way of handling upserts in MySql