Hi Julien,
this appears to be a bug in mapguide. I ran into the same problem
and discussed it with the core developers and they agree that the
resulting feature reader does not contain the ids of the inserted
features.
I do not know of a work around at this time. Actually, I just
thought of one. Add an attribute to your sdf file called
'uniqueid'. Create a unique value (uuid perhaps) and use it as the
value of that attribute when you insert the new feature. Then, after
you insert it, you can select it using a filter than selects only
that record. Then you can get the id.
Cheers
Paul
On 3-Oct-07, at 8:09 AM, julienltr wrote:
Hi,
I have a SDF file with three attributes :
- Id Int32 Autogenerated
- Name String
- Data Geometry
When a I want to add new value I insert a string for "Name" and a
geometry
for "Data".
Id is an integer auto-generated.
My question is how to know which Id was generated?
In the documentation, I find this in MgFeatureService::UpdateFeatures:
"Returns an MgPropertyCollection object. Each property in the
collection
corresponds to a command in the MgFeatureCommandCollection
argument. The
property name is the index of the command in the feature command
collection.
If the command is of type MgInsertFeatures, the property type is an
MgPropertyType::Feature, and its value is a MgFeatureReader object.
The
feature reader object contains the set of properties inserted into the
datastore by the insert command."
My problem is that I can't read into this feature reader?
I get an MgNullReferenceException whereas the feature reader isn't
null!
But I don't think I can find the id inside this reader...
Here's my code in C# (not to hard to understand ;))
// new values (name & data)
MgPropertyCollection propertyValues = new MgPropertyCollection();
propertyValues.Add(new MgStringProperty("Name",
DateTime.Now.ToString()));
propertyValues.Add(new MgGeometryProperty("Data", byteReader));
// insert new values
MgFeatureCommandCollection commands = new MgFeatureCommandCollection
();
commands.Add(new MgInsertFeatures(ClassName, propertyValues));
MgPropertyCollection propertyCollection =
featureService.UpdateFeatures(featureSourceId, commands, false);
// read the result
for (i = 0; i < propertyCollection.Count; i++)
{
// if MgInsertFeatures, PropertyType == MgPropertyType.Feature
if (propertyCollection.GetItem(i).PropertyType ==
MgPropertyType.Feature)
{
MgFeatureProperty featureProperty =
(MgFeatureProperty)propertyCollection.GetItem(i);
MgFeatureReader featureReader = featureProperty.GetValue();
for (int j = 0; j < featureReader.GetPropertyCount(); j++)
// GetPropertyCount() throw an MgNullReferenceException
{
string propertyName = featureReader.GetPropertyName
(j);
object propertyValue = Tools.GetProperty(featureReader,
propertyName);
// own function to do GetString or GetInt32, etc.
}
}
}
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