This method returns a Task-based asynchronous version of OracleCommand.ExecuteScalar(), which returns the first column of the first row in the result set returned by the query.

Declaration

// C#
public override Task<object> ExecuteScalarAsync(CancellationToken cancellationToken);

Parameters

cancellationToken - The input cancellation token which can be used by the application to cancel the task before command timeout occurs.

Return Value

Task<object> object representing the asynchronous operation immediately without blocking the calling thread for the whole duration of the query execution.

Implements

DbCommand

Exceptions

InvalidOperationException - The command cannot be executed.

Example

using Oracle.ManagedDataAccess.Client;
using System.Threading;

namespace AsyncApp
{
  class AsyncDemo
  {
    static async Task Main()
    {
      string connectionString = "User Id=HR; Password=<PASSWORD>; Data Source=oracle;";
      OracleConnection oc = new OracleConnection(connectionString);
      await oc.OpenAsync(CancellationToken.None);

      OracleCommand cmd = oc.CreateCommand();
      cmd.CommandText = "select * from demo_table";

      var value = await cmd.ExecuteScalarAsync(CancellationToken.None);
    }
  }
}