I have a simple application that uses an XML file to store it's data. That
means I don't have a seperate database. In order to read the data I created a
DataSet that reads my XML file with the .ReadXml() method.
1.
I want to manipulate the resulting dataset, preferably with SQL queries. But
the documentation states that I need to have a data connection to do this.
But if I am only using an XML file, how do I do this without a data
connection?
2.
When I fill the dataset I have no trouble reading the column names, but how
do I read the attributes? For instance, this is a portion of my XML file:
<partyList xmlns="http://tempuri.org/DataSchema.xsd" >
<party xmlns="http://tempuri.org/DataSchema.xsd" >
<Name>CDA</Name>
<Leader>
<Name>J.P. Balkenende</Name>
</Leader>
</Name>
</party>
</partyList>
To read the Party Name I use dsParties.Table s("Party").Rows (0).Item("Name" ),
but how do I access the Leader Name ?
Any help on these 2 questions would be appreciated!
-Chris 3 2291
"C. Hughes" <C. Hu****@discussi ons.microsoft.c om> schrieb 1. I want to manipulate the resulting dataset, preferably with SQL queries.
But the documentation states that I need to have a data connection to do this. But if I am only using an XML file, how do I do this without a data connection?
you can't modify a DataSet with SQL queries. You can only fill it by an
SqlCommand or DataAdapter which uses SQL queries and a data connection to
get data from a database.
If you want to filter the data of a DataSet, you can use DataViews. 2. When I fill the dataset I have no trouble reading the column names, but
how do I read the attributes? For instance, this is a portion of my XML file:
<partyList xmlns="http://tempuri.org/DataSchema.xsd" > <party> <Name>CDA</Name> <Leader> <Name>J.P. Balkenende</Name> </Leader> </Name> </party> </partyList>
To read the Party Name I use
dsParties.Table s("Party").Rows (0).Item("Name" ), but how do I access the Leader Name ?
dsParties.Table s("Leader").Row s(0).Item("Name ")
(Remark: Leader is not an attribut, it is an element)
Or if you have set the DataRelation between the Tables "Party" and "Leader"
(in C#):
dsParties.Table s["Party"].Rows[0].GetChildRows(r elationPartyLea der)[0]["Name
"]
Roughly: Elements (with complex type) will be readed as a table, and
Attributes (and Elements with simple type) as columns to the Element-tables.
Jaga
Hi Jaga,
Thanks for your reply. It has helped me, but there is one thing is still
don't understand.
If in my previous example "Leader" is loaded as a seperate table to "Party",
then how do I maintain a relation between these two? If I were to extend the
XML file so that each Party could have N number of leaders then how do i
still know which leader belongs to which party ?
"C. Hughes" <CH*****@discus sions.microsoft .com> wrote If in my previous example "Leader" is loaded as a seperate table to
"Party", then how do I maintain a relation between these two? If I were to extend
the XML file so that each Party could have N number of leaders then how do i still know which leader belongs to which party ?
Both tables ("Party" and "Leader") receives a column "Party_Id" with the
attribute ColumnMapping=H idden.
Each Party receives an unique Party_Id and each Leader receives the Party_Id
of his Party.
The DataSet receives a DataRelation "Party_Lead er" between the columns
Party.Party_Id and Leader.Party_Id .
Jaga This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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