public override VfpExpression Visit(VfpScanExpression expression)
{
WriteLine(Indentation.Inner);
//this.Write(" FROM ");
var definingQuery = expression.Target.TryGetValueForMetadataProperty <string>("DefiningQuery");
if (!string.IsNullOrEmpty(definingQuery))
{
Write("(");
Write(definingQuery);
Write(")");
}
else
{
var tableName = expression.Target.TryGetValueForMetadataProperty <string>("Table");
Write(string.IsNullOrEmpty(tableName) ? expression.Target.Name : tableName);
}
return(expression);
}
public override VfpExpression Visit(VfpScanExpression expression)
{
_expressions.Add(expression);
return(base.Visit(expression));
}
private VfpLimitExpression GetVfpLimitExpression(VfpLimitExpression limitExpression, VfpScanExpression scanExpression)
{
if (scanExpression == null)
{
return(null);
}
var keyMembers = GetKeyMembers(scanExpression.Target.ElementType.KeyMembers);
if (!keyMembers.Any())
{
return(null);
}
var variableReference = new VfpVariableReferenceExpression(scanExpression.ResultType, GetUniqueVariableName());
var expressionBinding = new VfpExpressionBinding(scanExpression, variableReference);
var sortClauses = GetSortClauses(keyMembers, expressionBinding).ToList().AsReadOnly();
var sortExpression = new VfpSortExpression(scanExpression.ResultType, expressionBinding, sortClauses);
return(new VfpLimitExpression(limitExpression.ResultType,
sortExpression,
limitExpression.Limit,
limitExpression.WithTies));
}
public virtual VfpExpression Visit(VfpScanExpression expression)
{
return(expression);
}
