private void ExecuteDeleteStatement(RequestExecutionContext context, RequestExecutionBuffer buffer, IDriverDataEnumerator sourceEnumerator)
{
if (sourceEnumerator == null)
{
return;
}
buffer.RowsOutput = 0;
var cts = context.CancellationTokenSource;
context.ClauseEvaluationContext.RowNumber = 0;
context.ClauseEvaluationContext.RowNumberInOutput = context.ClauseEvaluationContext.RowNumber;
var changeBuffer = context.ClauseEvaluationContext.ChangeBuffer;
var changeset = m_storageDriver.CreateChangeset(changeBuffer, context.ParsedRequest.IsBulk);
try
{
changeBuffer.ChangeType = DriverChangeType.Delete;
while (!cts.IsCancellationRequested && sourceEnumerator.MoveNext())
{
// if record satisfies WHERE criteria, compute updated values and give them to driver
if (ApplyWhereClause(context))
{
// load internal ID, it is needed
sourceEnumerator.FetchAdditionalFields();
sourceEnumerator.FetchInternalEntityIdIntoChangeBuffer(changeBuffer, context);
m_storageDriver.AddChange(changeset);
}
// row number is needed for "rownum()" Pql function
context.ClauseEvaluationContext.RowNumber++;
// output row number is needed for "rownumoutput()" Pql function
context.ClauseEvaluationContext.RowNumberInOutput = context.ClauseEvaluationContext.RowNumber;
}
if (!cts.IsCancellationRequested)
{
context.RecordsAffected = m_storageDriver.Apply(changeset);
}
}
catch
{
m_storageDriver.Discard(changeset);
throw;
}
}
private void ExecuteInsertUpdateStatement(RequestExecutionContext context, RequestExecutionBuffer buffer, IDriverDataEnumerator sourceEnumerator, DriverChangeType changeType)
{
if (sourceEnumerator == null)
{
return;
}
buffer.RowsOutput = 0;
var cts = context.CancellationTokenSource;
var updates = context.ParsedRequest.Modify.UpdateAssignments;
context.ClauseEvaluationContext.RowNumber = 0;
context.ClauseEvaluationContext.RowNumberInOutput = context.ClauseEvaluationContext.RowNumber;
var changeBuffer = context.ClauseEvaluationContext.ChangeBuffer;
var changeset = m_storageDriver.CreateChangeset(changeBuffer, context.ParsedRequest.IsBulk);
try
{
changeBuffer.ChangeType = changeType;
while (!cts.IsCancellationRequested && sourceEnumerator.MoveNext())
{
// if record satisfies WHERE criteria, compute updated values and give them to driver
if (ApplyWhereClause(context))
{
// make sure we have values for fields in SET expressions
sourceEnumerator.FetchAdditionalFields();
BitVector.SetAll(changeBuffer.Data.NotNulls, false);
for (var ordinal = 0; ordinal < updates.Count; ordinal++)
{
if (updates[ordinal].CompiledExpression != null)
{
updates[ordinal].CompiledExpression(context.ClauseEvaluationContext);
}
}
// this will either take internal entity id from current data row
// or from the computed change buffer data (for non-bulk inserts)
sourceEnumerator.FetchInternalEntityIdIntoChangeBuffer(changeBuffer, context);
m_storageDriver.AddChange(changeset);
}
// row number is needed for "rownum()" Pql function
context.ClauseEvaluationContext.RowNumber++;
// output row number is needed for "rownumoutput()" Pql function
context.ClauseEvaluationContext.RowNumberInOutput = context.ClauseEvaluationContext.RowNumber;
}
if (!cts.IsCancellationRequested)
{
context.RecordsAffected = m_storageDriver.Apply(changeset);
}
}
catch
{
m_storageDriver.Discard(changeset);
throw;
}
}
private void ExecuteDeleteStatement(RequestExecutionContext context, RequestExecutionBuffer buffer, IDriverDataEnumerator sourceEnumerator)
{
if (sourceEnumerator == null)
{
return;
}
buffer.RowsOutput = 0;
var cts = context.CancellationTokenSource;
context.ClauseEvaluationContext.RowNumber = 0;
context.ClauseEvaluationContext.RowNumberInOutput = context.ClauseEvaluationContext.RowNumber;
var changeBuffer = context.ClauseEvaluationContext.ChangeBuffer;
var changeset = m_storageDriver.CreateChangeset(changeBuffer, context.ParsedRequest.IsBulk);
try
{
changeBuffer.ChangeType = DriverChangeType.Delete;
while (!cts.IsCancellationRequested && sourceEnumerator.MoveNext())
{
// if record satisfies WHERE criteria, compute updated values and give them to driver
if (ApplyWhereClause(context))
{
// load internal ID, it is needed
sourceEnumerator.FetchAdditionalFields();
sourceEnumerator.FetchInternalEntityIdIntoChangeBuffer(changeBuffer, context);
m_storageDriver.AddChange(changeset);
}
// row number is needed for "rownum()" Pql function
context.ClauseEvaluationContext.RowNumber++;
// output row number is needed for "rownumoutput()" Pql function
context.ClauseEvaluationContext.RowNumberInOutput = context.ClauseEvaluationContext.RowNumber;
}
if (!cts.IsCancellationRequested)
{
context.RecordsAffected = m_storageDriver.Apply(changeset);
}
}
catch
{
m_storageDriver.Discard(changeset);
throw;
}
}
private void ExecuteInsertUpdateStatement(RequestExecutionContext context, RequestExecutionBuffer buffer, IDriverDataEnumerator sourceEnumerator, DriverChangeType changeType)
{
if (sourceEnumerator == null)
{
return;
}
buffer.RowsOutput = 0;
var cts = context.CancellationTokenSource;
var updates = context.ParsedRequest.Modify.UpdateAssignments;
context.ClauseEvaluationContext.RowNumber = 0;
context.ClauseEvaluationContext.RowNumberInOutput = context.ClauseEvaluationContext.RowNumber;
var changeBuffer = context.ClauseEvaluationContext.ChangeBuffer;
var changeset = m_storageDriver.CreateChangeset(changeBuffer, context.ParsedRequest.IsBulk);
try
{
changeBuffer.ChangeType = changeType;
while (!cts.IsCancellationRequested && sourceEnumerator.MoveNext())
{
// if record satisfies WHERE criteria, compute updated values and give them to driver
if (ApplyWhereClause(context))
{
// make sure we have values for fields in SET expressions
sourceEnumerator.FetchAdditionalFields();
BitVector.SetAll(changeBuffer.Data.NotNulls, false);
for (var ordinal = 0; ordinal < updates.Count; ordinal++)
{
if (updates[ordinal].CompiledExpression != null)
{
updates[ordinal].CompiledExpression(context.ClauseEvaluationContext);
}
}
// this will either take internal entity id from current data row
// or from the computed change buffer data (for non-bulk inserts)
sourceEnumerator.FetchInternalEntityIdIntoChangeBuffer(changeBuffer, context);
m_storageDriver.AddChange(changeset);
}
// row number is needed for "rownum()" Pql function
context.ClauseEvaluationContext.RowNumber++;
// output row number is needed for "rownumoutput()" Pql function
context.ClauseEvaluationContext.RowNumberInOutput = context.ClauseEvaluationContext.RowNumber;
}
if (!cts.IsCancellationRequested)
{
context.RecordsAffected = m_storageDriver.Apply(changeset);
}
}
catch
{
m_storageDriver.Discard(changeset);
throw;
}
}
