/// <summary>
/// Execute SQL that selects a single value.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="fullSql">The SQL to execute for this Query</param>
/// <returns>
/// The first cell selected as <see cref="object" />.
/// </returns>
public async Task <T> ExecuteScalarAsync <T>(string fullSql) => await ExecuteInternalAsync(() =>
SharedConnection.ExecuteScalarAsync <T>(fullSql, null, _transaction,
OneTimeCommandTimeout ?? CommandTimeout));
/// <summary>
/// Execute SQL that checks if record(s) exist.
/// </summary>
/// <param name="fullSql">The SQL to execute.</param>
/// <param name="parameters">The parameters to use for this query.</param>
/// <returns>
/// True if record is found.
/// </returns>
public async Task <bool> ExistsAsync(string fullSql, object parameters) => await ExecuteInternalAsync(() =>
SharedConnection.ExecuteScalarAsync <bool>(fullSql, parameters, _transaction,
OneTimeCommandTimeout ?? CommandTimeout));