How to pessimistic locking

问题

I want to lock my table, but it didn't work. How can I handle it? Appreciate any advice!

• Typescript
• Typeorm
• Postgres

//src
    public async checkDBTable(builderAddress: string): Promise<boolean> {
        // 1. find DB table by key(builderAddress)
        // 2. return true({key: value} exist) or false
        const info: InfoEntity|undefined = await this.findOne(builderAddress, {
            lock: {mode: 'pessimistic_write'}
        });
        return nonceInfo !== undefined;
    }

//result
    error: PessimisticLockTransactionRequiredError: An open transaction is required for pessimistic lock.

来源：https://stackoverflow.com/questions/63296041/how-to-pessimistic-locking