/// <summary>
/// We want to print the results out to a file.
/// </summary>
/// <param name="resultOperator"></param>
/// <param name="queryModel"></param>
/// <param name="_codeEnv"></param>
/// <param name="_codeContext"></param>
/// <param name="container"></param>
/// <returns></returns>
/// <remarks>
/// We can handle several types of streams here:
/// 1) a stream of double's - this is just one column.
/// 2) A stream of Tuples
/// 3) A stream of custom objects
/// </remarks>
public override Expression ProcessResultOperator(ResultOperatorBase resultOperator, QueryModel queryModel, IGeneratedQueryCode gc, ICodeContext cc, CompositionContainer container)
{
// Argument checking
var asCSV = resultOperator as AsCSVResultOperator;
if (asCSV == null)
{
throw new ArgumentException("resultOperaton");
}
// Declare the includes.
gc.AddIncludeFile("<fstream>");
gc.AddIncludeFile("<iostream>");
// The output filename. How we do this is a little funny because we need the hash from the completely
// done query, which isn't ready just yet.
var outputFile = GenerateUniqueFile(asCSV.OutputFile, cc);
var stream = DeclarableParameter.CreateDeclarableParameterExpression(typeof(OutputCSVTextFileType));
stream.InitialValue = new OutputCSVTextFileType(outputFile);
var headerline = new StringBuilder();
bool first = true;
foreach (var h in asCSV.HeaderColumns)
{
if (!first)
{
headerline.Append(",");
}
headerline.Append(h);
first = false;
}
gc.AddInitalizationStatement(new Statements.StatementSimpleStatement($"{stream.RawValue} << \"{headerline.ToString()}\" << std::endl;", dependentVars: new string[0], resultVars: new string[] { stream.RawValue }));
// Get the list of item values we are going to need here.
List <Expression> itemValues = ExtractItemValueExpressions(queryModel);
// We are just going to print out the line with the item in it.
var itemAsValues = itemValues.Select(iv => ExpressionToCPP.GetExpression(iv, gc, cc, container));
var pstatement = new StatementCSVDump(stream, itemAsValues.ToArray());
gc.Add(pstatement);
// The return is a file path in the C# world. But here in C++, what should be returned?
// We will use a string.
return(stream);
}
/// <summary>
/// We want to print the results out to a file.
/// </summary>
/// <param name="resultOperator"></param>
/// <param name="queryModel"></param>
/// <param name="_codeEnv"></param>
/// <param name="_codeContext"></param>
/// <param name="container"></param>
/// <returns></returns>
/// <remarks>
/// We can handle several types of streams here:
/// 1) a stream of double's - this is just one column.
/// 2) A stream of Tuples
/// 3) A stream of custom objects
/// </remarks>
public override Expression ProcessResultOperator(ResultOperatorBase resultOperator, QueryModel queryModel, IGeneratedQueryCode gc, ICodeContext cc, CompositionContainer container)
{
// Argument checking
var asCSV = resultOperator as AsCSVResultOperator;
if (asCSV == null)
throw new ArgumentException("resultOperaton");
// Declare the includes.
gc.AddIncludeFile("<fstream>");
gc.AddIncludeFile("<iostream>");
// The output filename. How we do this is a little funny because we need the hash from the completely
// done query, which isn't ready just yet.
var outputFile = GenerateUniqueFile(asCSV.OutputFile, cc);
var stream = DeclarableParameter.CreateDeclarableParameterExpression(typeof(OutputCSVTextFileType));
stream.InitialValue = new OutputCSVTextFileType(outputFile);
var headerline = new StringBuilder();
bool first = true;
foreach (var h in asCSV.HeaderColumns)
{
if (!first)
{
headerline.Append(", ");
}
headerline.Append(h);
first = false;
}
gc.AddInitalizationStatement(new Statements.StatementSimpleStatement($"{stream.RawValue} << \"{headerline.ToString()}\" << std::endl;", dependentVars: new string[0], resultVars: new string[] { stream.RawValue }));
// Get the list of item values we are going to need here.
List<Expression> itemValues = ExtractItemValueExpressions(queryModel);
// We are just going to print out the line with the item in it.
var itemAsValues = itemValues.Select(iv => ExpressionToCPP.GetExpression(iv, gc, cc, container));
var pstatement = new StatementCSVDump(stream, itemAsValues.ToArray());
gc.Add(pstatement);
// The return is a file path in the C# world. But here in C++, what should be returned?
// We will use a string.
return stream;
}
