BeginExecuteNonQuery() Method

Initiates the asynchronous request that is to be submitted to Teradata. This method differs from TdCommand.BeginExecuteReader in that it should not be used when retrieving data. A TdDataReader object is not returned when the corresponding TdCommand.EndExecuteNonQuery method is called.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Public Overloads Function BeginExecuteNonQuery() As IAsyncResult

'Usage
 
Dim instance As TdCommand
Dim value As IAsyncResult
 
value = instance.BeginExecuteNonQuery()

public IAsyncResult BeginExecuteNonQuery()

public:
IAsyncResult^ BeginExecuteNonQuery();

Return Value

Returns a IAsyncResult object.

Exceptions

Exception	Description
System.IndexOutOfRangeException	The `TdParameter.Offset` is outside of 0 through array size � 1.
System.InvalidCastException	One or more parameters cannot be converted to Teradata Database native types.
System.InvalidOperationException	Can be thrown because of one of the following errors: 1) `TdConnection` is not in Open state or is null or 2) The local transaction associated with the `TdCommand` is not the same local transaction associated with the `TdConnection`. Assign the local transaction to `Transaction` property.
System.ObjectDisposedException	The `TdCommand` is closed / disposed.
TdException	Can be thrown because the Data Provider detected an error.

Remarks

The call to BeginExecuteNonQuery returns after the request has been successfully sent to Teradata. Any exceptions that are generated by the provider while initializing the request will be thrown during the call to BeginExecuteNonQuery. Exceptions that are generated by the provider or Teradata during the processing of the request will be thrown when TdCommand.EndExecuteNonQuery is called.

The DDL statement CREATE PROCEDURE cannot be specified in an asynchronous execution. If it has been specified a TdException will be thrown when TdCommand.EndExecuteNonQuery is called.

A connection can only have one active request. Therefore, if an asynchronous request is being processed by the provider an exception will be thrown when an attempt is made to start another asynchronous request.

The TdCommand.CommandTimeout property is not applicable to asynchronous execution and will be ignored when a command is asynchronously executed.

Refer to TdCommand.ExecuteNonQuery for more information.

Example

The following example invokes an asynchronous request.

public void BeginExecute(String connectionString, String CommandText)
{
    TdConnection cn = new TdConnection(connectionString);
    cn.Open();
    
    IAsyncResult asyncResult;
            
    TdCommand cmd = new TdCommand(commandText, cn);
            
    //going to start asynchronous request
    asyncResult = cmd.BeginExecuteNonQuery();
            
    // going to perform other tasks
            
    //waiting for asynchronous execute to finish
    asyncResult.AsyncWaitHandle.WaitOne();
            
    //going to end the asynchronous request
    cmd.EndExecuteNonQuery(asyncResult);
            
     cn.Close();
}

Requirements

Product	Versions	Platforms
.NET	6, 7	Windows, Linux, MacOS
.NET Framework	4.6.2, 4.7, 4.7.1, 4.7.2, 4.8	Windows
.NET Standard	2.0	Windows, Linux, MacOS

Reference

TdCommand Class
TdCommand Members
Overload List
ExecuteNonQuery Method