protected DeleteCommandExpression UpdateDelete(DeleteCommandExpression delete, IdentifiableExpression table, Expression where)
{
if (table != delete.Identifiable || where != delete.Where)
{
return new DeleteCommandExpression(table, where);
}
return delete;
}
protected virtual Expression VisitDelete(DeleteCommandExpression delete)
{
var table = (IdentifiableExpression)this.Visit(delete.Identifiable);
var where = this.Visit(delete.Where);
return this.UpdateDelete(delete, table, where);
}
protected override Expression VisitDelete(DeleteCommandExpression delete)
{
if (delete.Identifiable.Entity.EntityType.Implements<IThing>())
{
this.Write("DELETE Vertex ");
}
else if (delete.Identifiable.Entity.EntityType.Implements<IAssociation>())
{
this.Write("DELETE Edge ");
}
else throw new NotSupportedException("Only Association and Thing types are supported.");
bool saveHideIdentifiable = this.HideIdentifiableAliases;
bool saveHideField = this.HideFieldAliases;
this.HideIdentifiableAliases = true;
this.HideFieldAliases = true;
this.VisitSource(delete.Identifiable);
if (delete.Where != null)
{
this.WriteLine(Indentation.Same);
this.Write("WHERE ");
this.VisitPredicate(delete.Where);
}
this.HideIdentifiableAliases = saveHideIdentifiable;
this.HideFieldAliases = saveHideField;
return delete;
}
protected override Expression VisitDelete(DeleteCommandExpression delete)
{
this.Write("DELETE FROM ");
bool saveHideIdentifiable = this.HideIdentifiableAliases;
bool saveHideField = this.HideFieldAliases;
this.HideIdentifiableAliases = true;
this.HideFieldAliases = true;
this.VisitSource(delete.Identifiable);
if (delete.Where != null)
{
this.WriteLine(Indentation.Same);
this.Write("WHERE ");
this.VisitPredicate(delete.Where);
}
this.HideIdentifiableAliases = saveHideIdentifiable;
this.HideFieldAliases = saveHideField;
return delete;
}
protected virtual bool CompareDelete(DeleteCommandExpression x, DeleteCommandExpression y)
{
return this.Compare(x.Identifiable, y.Identifiable) && this.Compare(x.Where, y.Where);
}