public override EtlStepResult Invoke(EtlContext context, IEtlLogger logger)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (logger == null)
{
throw new ArgumentNullException("logger");
}
if (this.Source == null)
{
throw new InvalidOperationException("Source cannot be null");
}
if (string.IsNullOrEmpty(this.Source.ConnectionString))
{
throw new InvalidOperationException("Source.ConnectionString cannot be empty");
}
if (string.IsNullOrEmpty(this.Source.ProviderName))
{
throw new InvalidOperationException("Source.ProviderName cannot be empty");
}
if (string.IsNullOrEmpty(this.Source.Text))
{
throw new InvalidOperationException("Source.Text cannot be empty");
}
var result = new EtlStepResult(EtlStatus.Succeeded, null);
var rowCounter = (this.Counters != null && this.Counters.RowCount != null && !string.IsNullOrEmpty(this.Counters.RowCount.CounterName))
? new EtlCounter
{
EtlPackageId = context.EtlPackageId,
EtlSessionId = context.EtlSessionId,
EntityName = this.Counters.RowCount.EntityName,
CounterName = this.Counters.RowCount.CounterName,
}
: null;
var hasOutputVariables = this.OutputVariables != null && this.OutputVariables.FirstRow.Count > 0;
var hasRowCounter = rowCounter != null;
using (var dbAccessor = new DBAccessor(this.Source.ConnectionString, this.Source.ProviderName))
{
if (hasOutputVariables || hasRowCounter)
{
using (var dbReader = dbAccessor.ExecuteQuery(this.Source.Text, EtlQueryParameter.ToDictionary(this.Source.Parameters), this.TimeoutMilliseconds))
{
if (dbReader.Read())
{
if (hasRowCounter)
{
rowCounter.CounterValue++;
}
if (hasOutputVariables)
{
foreach (var firstRowResult in this.OutputVariables.FirstRow)
{
var firstRowResultValue = EtlValueTranslation.Evaluate(firstRowResult.SourceFieldName, firstRowResult.SourceFieldTranslation, dbReader, firstRowResult.DefaultValue);
result.VariableAssignments.Add(new EtlVariableAssignment(firstRowResult.VariableName, EtlValueConverter.ToString(firstRowResultValue)));
}
}
}
if (hasRowCounter)
{
while (dbReader.Read())
{
rowCounter.CounterValue++;
}
rowCounter.DateTime = DateTime.Now;
rowCounter.UtcDateTime = rowCounter.DateTime.ToUniversalTime();
logger.LogEtlCounter(rowCounter);
}
}
}
else
{
dbAccessor.ExecuteNonQuery(this.Source.Text, EtlQueryParameter.ToDictionary(this.Source.Parameters), this.TimeoutMilliseconds);
}
}
return(result);
}