public static string Copy(Program program, TableNode sourceTable, TableNode targetTable, GenerateStatementHandler generateStatement)
{
Statement targetStatement =
generateStatement
(
sourceTable,
targetTable,
(Expression)targetTable.EmitStatement(Alphora.Dataphor.DAE.Language.D4.EmitMode.ForCopy)
);
Schema.Key displaySourceKey = program.FindClusteringKey(sourceTable.TableVar);
StringBuilder result = new StringBuilder();
long succeededUpdateCount = 0;
long failedUpdateCount = 0;
bool maxResultLengthMessageWritten = false;
// Start a new process so that we don't mess with the transaction context of this one
ProcessInfo info = new ProcessInfo(program.ServerProcess.ServerSession.SessionInfo);
info.UseImplicitTransactions = false;
IServerProcess targetProcess = ((IServerSession)program.ServerProcess.ServerSession).StartProcess(info);
try
{
Program targetProgram = new Program((ServerProcess)targetProcess);
targetProgram.Code = targetTable;
targetProgram.Start(null);
try
{
// Have the target program use the main program's context
Stack oldTargetContext = targetProgram.SwitchContext(program.Stack);
try
{
info.DefaultIsolationLevel = IsolationLevel.Browse;
IServerProcess sourceProcess = ((IServerSession)program.ServerProcess.ServerSession).StartProcess(info);
try
{
Program sourceProgram = new Program((ServerProcess)sourceProcess);
sourceProgram.Code = sourceTable;
sourceProgram.Start(null);
try
{
// Have the source program use the main program's context
Stack oldSourceContext = sourceProgram.SwitchContext(program.Stack);
try
{
ITable source = (ITable)sourceTable.Execute(sourceProgram);
try
{
source.Open();
// TODO: IBAS Project #26790 - allow cross-process row copies for streamed types
// There is a MarshalRow call in the LocalProcess, would that solve this problem?
using (Row row = new Row(targetProcess.ValueManager, sourceTable.DataType.CreateRowType()))
{
DataParams paramsValue = new DataParams();
paramsValue.Add(new DataParam("ASourceRow", row.DataType, DAE.Language.Modifier.Const, row));
IServerStatementPlan target = targetProcess.PrepareStatement(new D4TextEmitter().Emit(targetStatement), paramsValue);
try
{
target.CheckCompiled();
while (source.Next())
{
row.ClearValues();
targetProcess.BeginTransaction(IsolationLevel.Isolated);
try
{
source.Select(row);
target.Execute(paramsValue);
targetProcess.CommitTransaction();
succeededUpdateCount++;
}
catch (Exception exception)
{
failedUpdateCount++;
targetProcess.RollbackTransaction();
if (result.Length < 100000)
{
result.Append(KeyValuesToString(displaySourceKey, row) + " - " + exception.Message + "\r\n");
}
else
{
if (!maxResultLengthMessageWritten)
{
result.Append(Strings.Get("MaxResultLengthExceeded"));
maxResultLengthMessageWritten = true;
}
}
}
// Yield in case our process is aborted.
program.CheckAborted();
}
}
finally
{
targetProcess.UnprepareStatement(target);
}
}
}
finally
{
source.Close();
}
}
finally
{
sourceProgram.SwitchContext(oldSourceContext); // Don't let the source program cleanup the main context
}
}
finally
{
sourceProgram.Stop(null);
}
}
finally
{
((IServerSession)program.ServerProcess.ServerSession).StopProcess(sourceProcess);
}
result.AppendFormat(Strings.Get("Results"), succeededUpdateCount, failedUpdateCount);
return(result.ToString());
}
finally
{
targetProgram.SwitchContext(oldTargetContext); // Don't let the target program cleanup the main context
}
}
finally
{
targetProgram.Stop(null);
}
}
finally
{
((IServerSession)program.ServerProcess.ServerSession).StopProcess(targetProcess);
}
}