IBCPSession::BCPExec (OLE DB)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
Performs the bulk copy operation.
Syntax
HRESULT BCPExec(
DBROWCOUNT *pRowsCopied);
Remarks
The BCPExec method copies data from a user file to a database table or vice versa, depending on the value of the eDirection parameter used with the IBCPSession::BCPInit method.
Before calling BCPExec, call the BCPInit method with a valid user file name. Failure to do so results in an error. The only exception is if a query is to be used for a bulk copy out operation. In that case specify NULL for the table name in the BCPInit method and then specify the query using the BCP_OPTION_HINTS option.
The BCPExec method is the only bulk copy method that is likely to be outstanding for any length of time. It is therefore the only bulk copy method that supports asynchronous mode. To use asynchronous mode, set the provider specific session property SSPROP_ASYNCH_BULKCOPY to VARIANT_TRUE before calling the BCPExec method. This property is available in the DBPROPSET_SQLSERVERSESSION property set. To test for completion, call the BCPExec method with the same parameters. If the bulk copy has not yet completed, the BCPExec method returns DB_S_ASYNCHRONOUS. It also returns in the pRowsCopied argument a status count of the number of rows that have been sent to or received from the server. Rows sent to the server are not committed until the end of a batch has been reached.
Arguments
pRowsCopied[out]
A pointer to a DWORD. The BCPExec method fills the DWORD with the number of rows successfully copied. If the pRowsCopied argument is set to NULL, it is ignored by the BCPExec method.
Return Code Values
S_OK
The method succeeded.
E_FAIL
A provider-specific error occurred; for detailed information, use the ISQLServerErrorInfo interface.
E_UNEXPECTED
The call to the method was unexpected. For example, the BCPInit method was not called before calling this method. Also occurs if the operation has been aborted through using the BCP_OPTION_ABORT option, and the BCPExec method was called afterwards.
E_OUTOFMEMORY
Out-of-memory error.
DB_S_ENDOFROWSET
The bulk copy operation finished, and all the data transfer was completed.
DB_S_ASYNCHRONOUS
The current batch of rows has been copied. Call the BCPExec method again to transfer the next batch.
DB_S_ERRORSOCCURRED
Errors occurred during the bulk copy operation, and some rows might not have been copied. The number of errors is still less than the maximum errors allowed.