@ocap/statedb-qldb/lib/table/token.js

OCAP statedb adapter that uses amazon qldb as backend statedb

const QLDBTable = require('./base');

class TokenTable extends QLDBTable {
  constructor(...args) {
    super(...args);

    this.indexes.push('symbol');
  }

  async existBySymbol(symbol, { txn }) {
    if (!symbol) {
      return false;
    }

    const result = await txn.execute(`SELECT address FROM ${this.name} WHERE "symbol" = ?`, symbol);
    const item = result.getResultList();
    return JSON.parse(JSON.stringify(item)).length > 0;
  }
}

module.exports = TokenTable;