public AverageAggregator(IAggregator sumAggregator, Expression <object> avgExpression, ParameterBinding sumParameter, ParameterBinding countParameter)
{
if (sumAggregator == null)
{
throw ExceptionBuilder.ArgumentNull("sumAggregator");
}
if (avgExpression == null)
{
throw ExceptionBuilder.ArgumentNull("avgExpression");
}
if (sumParameter == null)
{
throw ExceptionBuilder.ArgumentNull("sumParam");
}
if (countParameter == null)
{
throw ExceptionBuilder.ArgumentNull("countParam");
}
_sumAggregator = sumAggregator;
_avgExpression = avgExpression;
_returnType = avgExpression.Resolve();
_sumParameter = sumParameter;
_countParameter = countParameter;
}
public SumAggregator(Expression <object> addExpression, ParameterBinding leftParameter, ParameterBinding rightParameter, Expression <object> convertInputToSumExpression)
{
if (addExpression == null)
{
throw ExceptionBuilder.ArgumentNull("addExpr");
}
if (leftParameter == null)
{
throw ExceptionBuilder.ArgumentNull("leftParam");
}
if (rightParameter == null)
{
throw ExceptionBuilder.ArgumentNull("rightParam");
}
if (convertInputToSumExpression == null)
{
throw ExceptionBuilder.ArgumentNull("convertInputToSumExpr)");
}
_addExpression = addExpression;
_returnType = addExpression.Resolve();
_leftParameter = leftParameter;
_rightParameter = rightParameter;
_convertInputToSumExpression = convertInputToSumExpression;
}
public override IAggregator CreateAggregator(Type inputType)
{
if (inputType == null)
{
throw ExceptionBuilder.ArgumentNull("inputType");
}
SumAggregateBinding sumAggregate = new SumAggregateBinding(String.Empty);
IAggregator sumAggregator = sumAggregate.CreateAggregator(inputType);
if (sumAggregator == null)
{
return(null);
}
Expression <object> avgExpression = new Expression <object>();
ParameterBinding sumParam = avgExpression.Parameters.Add("@Sum", sumAggregator.ReturnType);
ParameterBinding countParam = avgExpression.Parameters.Add("@Count", typeof(int));
avgExpression.Text = "@Sum / @Count";
try
{
avgExpression.Resolve();
}
catch (CompilationException)
{
return(null);
}
return(new AverageAggregator(sumAggregator, avgExpression, sumParam, countParam));
}
private static void EditParameter(ParameterBinding parameter)
{
using (EditParameterForm dlg = new EditParameterForm(false, parameter.Name, parameter.DataType, parameter.Value))
{
if (dlg.ShowDialog() == DialogResult.OK)
parameter.Value = dlg.ParameterValue;
}
}
private void NewParameter()
{
string parameterName = "Param" + (_evaluatable.Parameters.Count + 1);
Type parameterType = typeof(string);
string parameterValue = null;
using (EditParameterForm dlg = new EditParameterForm(true, parameterName, parameterType, parameterValue))
{
if (dlg.ShowDialog() == DialogResult.OK)
{
ParameterBinding newParameter = new ParameterBinding(dlg.ParameterName, dlg.ParameterType);
newParameter.Value = dlg.ParameterValue;
_evaluatable.Parameters.Add(newParameter);
}
}
}
public SumAggregator(Expression<object> addExpression, ParameterBinding leftParameter, ParameterBinding rightParameter, Expression<object> convertInputToSumExpression)
{
if (addExpression == null)
throw ExceptionBuilder.ArgumentNull("addExpr");
if (leftParameter == null)
throw ExceptionBuilder.ArgumentNull("leftParam");
if (rightParameter == null)
throw ExceptionBuilder.ArgumentNull("rightParam");
if (convertInputToSumExpression == null)
throw ExceptionBuilder.ArgumentNull("convertInputToSumExpr)");
_addExpression = addExpression;
_returnType = addExpression.Resolve();
_leftParameter = leftParameter;
_rightParameter = rightParameter;
_convertInputToSumExpression = convertInputToSumExpression;
}
public AverageAggregator(IAggregator sumAggregator, Expression<object> avgExpression, ParameterBinding sumParameter, ParameterBinding countParameter)
{
if (sumAggregator == null)
throw ExceptionBuilder.ArgumentNull("sumAggregator");
if (avgExpression == null)
throw ExceptionBuilder.ArgumentNull("avgExpression");
if (sumParameter == null)
throw ExceptionBuilder.ArgumentNull("sumParam");
if (countParameter == null)
throw ExceptionBuilder.ArgumentNull("countParam");
_sumAggregator = sumAggregator;
_avgExpression = avgExpression;
_returnType = avgExpression.Resolve();
_sumParameter = sumParameter;
_countParameter = countParameter;
}
public void DictionaryProperties()
{
Query query = QueryFactory.CreateQuery();
query.Text = @"
SELECT e.EmployeeID,
e.FirstName,
e.LastName
FROM Employees e
WHERE e.EmployeeID BETWEEN 1 AND 2
ORDER BY 1
";
Hashtable hashtable = new Hashtable();
hashtable["EmployeeID"] = -1;
hashtable["FirstName"] = "";
hashtable["LastName"] = "";
ParameterBinding param = new ParameterBinding("@ROW", typeof (IDictionary), DictionaryPropertyProvider.GetProperties(hashtable));
Expression<object> expr = new Expression<object>();
expr.DataContext = query.DataContext;
expr.Parameters.Add(param);
DataTable dataTable = query.ExecuteDataTable();
foreach (DataRow row in dataTable.Rows)
{
Hashtable rowHashtable = new Hashtable();
param.Value = rowHashtable;
foreach (DataColumn col in dataTable.Columns)
rowHashtable[col.ColumnName] = row[col];
foreach (DataColumn col in dataTable.Columns)
{
expr.Text = "@ROW.[" + col.ColumnName + "]";
Assert.AreEqual(row[col], expr.Evaluate());
}
}
}
public void DataRowProperties()
{
Query query = QueryFactory.CreateQuery();
query.Text = @"
SELECT e.EmployeeID,
e.FirstName,
e.LastName
FROM Employees e
WHERE e.EmployeeID BETWEEN 1 AND 2
ORDER BY 1
";
DataTable result = query.ExecuteDataTable();
Assert.AreEqual(2, result.Rows.Count);
Expression<object> expr = new Expression<object>();
expr.DataContext = query.DataContext;
ParameterBinding param = new ParameterBinding("@ROW", typeof (DataRow), DataRowPropertyProvider.GetProperties(result));
expr.Parameters.Add(param);
param.Value = result.Rows[0];
expr.Text = "@ROW.EmployeeID";
Assert.AreEqual(1, expr.Evaluate());
expr.Text = "@ROW.FirstName";
Assert.AreEqual("Nancy", expr.Evaluate());
expr.Text = "@ROW.LastName";
Assert.AreEqual("Davolio", expr.Evaluate());
param.Value = result.Rows[1];
expr.Text = "@ROW.EmployeeID";
Assert.AreEqual(2, expr.Evaluate());
expr.Text = "@ROW.FirstName";
Assert.AreEqual("Andrew", expr.Evaluate());
expr.Text = "@ROW.LastName";
Assert.AreEqual("Fuller", expr.Evaluate());
}
public void AcceptParameter(ParameterBinding parameter)
{
Add("@" + parameter.Name, parameter.GetFullName(), parameter.DataType.Name, PARAMETER_IMG_INDEX);
Add(parameter.Name, parameter.GetFullName(), parameter.DataType.Name, PARAMETER_IMG_INDEX);
}
void IErrorReporter.AmbiguousParameter(SourceRange sourceRange, Identifier identifier, ParameterBinding[] candidates)
{
string message = String.Format(CultureInfo.CurrentCulture, Resources.AmbiguousParameter, identifier, FormattingHelpers.FormatBindingList(candidates));
HandleError(sourceRange, ErrorId.AmbiguousParameter, message);
}
public MyFunctionParameter(ParameterBinding parameter)
{
_parameter = parameter;
}
public override IAggregator CreateAggregator(Type inputType)
{
if (inputType == null)
{
throw ExceptionBuilder.ArgumentNull("inputType");
}
// Create an expression to determine the type of inputType + inputType
Expression <object> addExpr = new Expression <object>();
addExpr.Parameters.Add("@Left", inputType);
addExpr.Parameters.Add("@Right", inputType);
addExpr.Text = "@Left + @Right";
Type sumType;
try
{
sumType = addExpr.Resolve();
}
catch (CompilationException)
{
return(null);
}
// Now change the type of the first argument to the result type of 'inputType + inputType'
addExpr.Parameters.Clear();
ParameterBinding leftParam = addExpr.Parameters.Add("@Left", sumType);
ParameterBinding rightParam = addExpr.Parameters.Add("@Right", inputType);
addExpr.Text = "@Left + @Right";
try
{
Type newSumType = addExpr.Resolve();
if (newSumType != sumType)
{
return(null);
}
}
catch (CompilationException)
{
return(null);
}
// Conversion from inputType to sumType
Expression <object> convertInputToSumExpr = new Expression <object>();
convertInputToSumExpr.Parameters.Add("@Input", inputType);
convertInputToSumExpr.Text = "@Input";
convertInputToSumExpr.TargetType = sumType;
try
{
convertInputToSumExpr.Resolve();
}
catch (CompilationException)
{
return(null);
}
return(new SumAggregator(addExpr, leftParam, rightParam, convertInputToSumExpr));
}
public void AcceptParameter(ParameterBinding parameter)
{
}
