Drizzle Team•12mo ago

Can I .prepare() a transaction?

Surprisingly I can call prepare inside transaction callback but it doesn't make sense to me since we usually using prepare() as a variable out of block scope.

  await db.transaction(async (tx) => {
    const q1 = tx.update(...).set(...).where(...).prepare();
    const q2 = tx.insert(...).values(...).prepare();

    await q1.execute();
    await q2.execute();
  });

  await db.transaction(async (tx) => {
    const q1 = tx.update(...).set(...).where(...).prepare();
    const q2 = tx.insert(...).values(...).prepare();

    await q1.execute();
    await q2.execute();
  });

2 Replies

Angelelz•12mo ago

This is something I've been wanting to dive into but I just haven't have time I would think it doesn't really make much sense to prepare statements inside a transaction, but preparing them outside, I'm not really sure they would use the same connection as the transaction I would need to investigate if calling db.<...>.prepare() outside the transaction sets up the connection from the pool or not

Bea dm•4mo ago

Hi, is there any documentation about this? i just only found this https://github.com/ItzDerock/hostforge/blob/9798ab27fc7a1b960f7c94be46b3f3310c8cfc72/src/server/api/routers/projects/service/index.ts#L81C50-L81C72 but not sure, in my code session does not exist if i type it. I tried this with no luck could you help me a bit please?

const insertScoreCard = (db: DatabaseClient) => db.insert(scoreCards).values({ .. }).prepare('insert_score_card');
export const createScorecard = (dbClient: DatabaseClient) => async () => {
    await dbClient.transaction(async (trx: PostgresTransaction) => {
        const db: DatabaseClient = trx.session.client;
        // Prepare the statements for scorecards
        const insertStatement = insertScoreCard(db);
        const insertedScoreCard = await insertStatement.run(newScoreCard);
        ...
};

const insertScoreCard = (db: DatabaseClient) => db.insert(scoreCards).values({ .. }).prepare('insert_score_card');
export const createScorecard = (dbClient: DatabaseClient) => async () => {
    await dbClient.transaction(async (trx: PostgresTransaction) => {
        const db: DatabaseClient = trx.session.client;
        // Prepare the statements for scorecards
        const insertStatement = insertScoreCard(db);
        const insertedScoreCard = await insertStatement.run(newScoreCard);
        ...
};

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Can I .prepare() a transaction?