The CData ADO.NET providers are easy-to-use, standards-based controls that can be used
from any platform or development technology that supports Microsoft .NET, including
PowerBuilder. This article shows how to use the CData ADO.NET Provider for HDFS
in PowerBuilder.
This article shows how to create a basic PowerBuilder application that uses the CData ADO.NET Provider for HDFS to retrieve data.
- In a new WPF Window Application solution, add all the Visual Controls needed for the connection properties. Below is a typical connection string:
Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;User=root;
In order to authenticate, set the following connection properties:
- Host: Set this value to the host of your HDFS installation.
- Port: Set this value to the port of your HDFS installation. Default port: 50070
- Add the DataGrid control from the .NET controls.
-
Configure the columns of the DataGrid control. Below are several columns from the Account table:
<DataGrid AutoGenerateColumns="False" Margin="13,249,12,14" Name="datagrid1" TabIndex="70" ItemsSource="{Binding}">
<DataGrid.Columns>
<DataGridTextColumn x:Name="idColumn" Binding="{Binding Path=Id}" Header="Id" Width="SizeToHeader" />
<DataGridTextColumn x:Name="nameColumn" Binding="{Binding Path=FileId}" Header="FileId" Width="SizeToHeader" />
...
</DataGrid.Columns>
</DataGrid>
- Add a reference to the CData ADO.NET Provider for HDFS assembly.
Connect the DataGrid
Once the visual elements have been configured, you can use standard ADO.NET
objects like Connection, Command, and DataAdapter to populate a DataTable with the results
of an SQL query:
System.Data.CData.HDFS.HDFSConnection conn
conn = create System.Data.CData.HDFS.HDFSConnection(connectionString)
System.Data.CData.HDFS.HDFSCommand comm
comm = create System.Data.CData.HDFS.HDFSCommand(command, conn)
System.Data.DataTable table
table = create System.Data.DataTable
System.Data.CData.HDFS.HDFSDataAdapter dataAdapter
dataAdapter = create System.Data.CData.HDFS.HDFSDataAdapter(comm)
dataAdapter.Fill(table)
datagrid1.ItemsSource=table.DefaultView
The code above can be used to bind data from the specified query to the DataGrid.