Drizzle Team•5mo ago

Best practices for handling planetscale DatabaseErrors with Drizzle?

How are you meant to catch certain/expected DB errors in your server code? This would be useful, for instance, to repeat insertion with a different ID if a user already exists.

import { DatabaseError } from '@planetscale/database';
// ...

try {
    const isUserCreated = await this._userService.signUp(body);
    return Respond.success(isUserCreated, { code: HTTPStatusCodes.Created201 });
} catch (e) {
    if (e instanceof ApiError) {
        return Respond.error(e.code, e.message, { details: e.details });
    } else if (e instanceof DatabaseError) {
        switch (e.status) { /* <- Is this the Mysql error code? */
            case MySQLErrorCodes.ER_DUP_ENTRY:
                // retry x times
                break;
            default:
                return Respond.serverError('An error occured in the database', {
                    details: e.body
                });
        }
    }
    console.error(e);
    return Respond.serverError('Unknown server error', e ? { details: e } : undefined);
}

import { DatabaseError } from '@planetscale/database';
// ...

try {
    const isUserCreated = await this._userService.signUp(body);
    return Respond.success(isUserCreated, { code: HTTPStatusCodes.Created201 });
} catch (e) {
    if (e instanceof ApiError) {
        return Respond.error(e.code, e.message, { details: e.details });
    } else if (e instanceof DatabaseError) {
        switch (e.status) { /* <- Is this the Mysql error code? */
            case MySQLErrorCodes.ER_DUP_ENTRY:
                // retry x times
                break;
            default:
                return Respond.serverError('An error occured in the database', {
                    details: e.body
                });
        }
    }
    console.error(e);
    return Respond.serverError('Unknown server error', e ? { details: e } : undefined);
}

Problem is, unlike Prisma, I don't seem to be able to access a mysql error code, all I get is an error message string like

target: xyz.-.primary: vttablet: rpc error: code = AlreadyExists desc = Duplicate entry '1' for key 'user.user_username_unique' (errno 1062) (sqlstate 23000) ....

Is my best bet really to parse the code using regex?

const errnoMatch = err.body.message.match(/errno (\d+)/);
if (errnoMatch) {
    const errno = parseInt(errnoMatch[1]);
    // Compare errno to MySQLErrorCodes enum
}

const errnoMatch = err.body.message.match(/errno (\d+)/);
if (errnoMatch) {
    const errno = parseInt(errnoMatch[1]);
    // Compare errno to MySQLErrorCodes enum
}

2 Replies

Liltripple_reid•5mo ago

upvoting this did you find a way to do this? @Domski

Domski•5mo ago

Unfortunately not, no

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Best practices for handling planetscale DatabaseErrors with Drizzle?