Question

Data Relations Question - how I can update a field on the parent table from the child table

Asked by: Hojoformo

I have a dataset with table relations for a parent and 2 childern.  I want to know how I can update a field on the parent  table from the child table.

Parent      Dataset1.Table[Item]    

Child 1     Dataset1.Table[Descriptions]  (Parent Relation Name  is Item_Descriptions,  
                                                                     Parent Column  is Item_id)
Child 2     Dataset1.Table[Description]    (Parent Relation Name is Descriptions_Description,    
                                                                    Parent Column  is Descriptions_ID)

My Logic:
foreach (DataRow dr2 in XmlData1.Tables["Description"].Rows)
         {
//Set the status on the Parent Row
//This does not work but I thought it would be something like this
             XmlData1.Tables["Description"].Rows[0].GetParentRow("Descriptions_Description").GetParentRow("Item_Descriptons")["Part_Status"].ToString() = "Test";

All I want to do is update a field on the Parent table Item from the Child 2 table.

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Asked On
2009-11-03 at 08:16:18ID24867614
Topic

.NET

Participating Experts
1
Points
500
Comments
4

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Answers

 

by: x77Posted on 2009-11-03 at 09:53:08ID: 25731566

You are assign "Test" To a Function - ToString()
Try Supress "ToString()"

 

by: HojoformoPosted on 2009-11-03 at 14:37:08ID: 25734608

This still does not work.

XmlData1.Tables["Description"].Rows[0].GetParentRow("Descriptions_Description").GetParentRow("Item_Descriptons")["PartNumber"] = "Test

All I need to do is change the field value of a column in the parent table from the child table.  I have the child table row now I need to change the Part Number column on the parent table named Item.  What is the best way for doing this?

 

by: x77Posted on 2009-11-03 at 14:59:44ID: 25734843

DataRow R = XmlData1.Tables["Description"].Rows[0];
// if ParentTable has PrimaryKey
DataRow ParentRow = ParentTable.Find(R[ColumnKeyOnChildTable]);
ParentRow["PartNumber"] = "Test"
I Do not know about a GetParentRow Function, Use Find (PrimariKey of Parent Table)

 

by: x77Posted on 2009-11-03 at 15:08:37ID: 25734910

If the relation is not based on primarikey of Parent Table then
Use Select(Condition) to obtain the parent row / rows of parent table.
DataRow[] Rows= ParentTable.Select("ParentColumn=" & r["ChildColumn"].tostring & """")
Then Update each row
ParentColumn and ChildColumn are columns of relation.

20120131-EE-VQP-002

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