ADO.NET Provider for Apache HBase

Build 21.0.7930

Result Sets

You can access the same column information about the results of a query that you can for table schemas. See Columns for the columns returned.

Retrieving Result Set Metadata

You can use the GetSchemaTable method of the ApacheHBaseDataReader to retrieve result set metadata. Call GetSchemaTable after calling ExecuteReader.

Each row of the DataTable describes a column in the query's result.

C#

string connectionString = "Server=127.0.0.1;Port=8080;";

using (ApacheHBaseConnection conn = new ApacheHBaseConnection(connectionString)) {
  ApacheHBaseCommand cmd = new ApacheHBaseCommand("SELECT * FROM Account WHERE Industry = 'Floppy Disks'", conn);
  ApacheHBaseDataReader rdr = cmd.ExecuteReader();
  DataTable schemaTable = rdr.GetSchemaTable();
  foreach (DataRow row in schemaTable.Rows) {
    foreach (DataColumn col in schemaTable.Columns) {
      Console.WriteLine("{0}: {1}", col.ColumnName, row[col]);
    }
  }
}

VB.NET

Dim connectionString As String = "Server=127.0.0.1;Port=8080;"

Using conn As New ApacheHBaseConnection(connectionString)
  Dim cmd As New ApacheHBaseCommand("SELECT * FROM Account WHERE Industry = 'Floppy Disks'", conn)
  Dim rdr As ApacheHBaseDataReader = cmd.ExecuteReader()
  Dim schemaTable As DataTable = rdr.GetSchemaTable()
  For Each row As DataRow In schemaTable.Rows
    For Each col As DataColumn In schemaTable.Columns
      Console.WriteLine("{0}: {1}", col.ColumnName, row(col))
    Next
  Next
End Using

Copyright (c) 2021 CData Software, Inc. - All rights reserved.
Build 21.0.7930