FieldCount Property (PgSqlDataReader)

In This Topic

Gets the number of columns in the current row.

Syntax

Visual Basic
C#

'Declaration
 
Public Overrides ReadOnly Property FieldCount As Integer

public override int FieldCount {get;}

Property Value

When not positioned in a valid record set, 0; otherwise the number of columns in the current record. The default value is -1.

Remarks

After executing a query that does not return rows, FieldCount returns 0.

Example

This sample demonstrates how to iterate through fields in a row using FieldCount property.

csharp

public void FetchResults(PgSqlConnection pgConnection)
{
  PgSqlCommand cmd = new PgSqlCommand("SELECT * FROM Test.Dept");
  cmd.FetchSize = 100;
  cmd.Connection = pgConnection;
  pgConnection.Open();
  try
  {
    PgSqlDataReader reader = cmd.ExecuteReader();
    while (reader.Read())
    {
      for (int i=0;i<reader.FieldCount;i++)
      {
        Console.Write("\t"+reader[i]);
      }
      Console.WriteLine();
    }
  }
  finally
  {
    pgConnection.Close();
  }
}

Visual Basic

Public Sub FetchResults(ByVal pgConnection As PgSqlConnection)
  Dim cmd As PgSqlCommand = New PgSqlCommand("SELECT * FROM Test.Dept")
  cmd.FetchSize = 100
  cmd.Connection = pgConnection
  pgConnection.Open()
  Try
    Dim reader As PgSqlDataReader = cmd.ExecuteReader()
    While reader.Read()
      Dim i
      For i = 0 To reader.FieldCount - 1
        Console.Write(String.Concat(" ", reader(i)))
      Next i
      Console.WriteLine()
    End While
  Finally
    pgConnection.Close()
  End Try
End Sub

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

PgSqlDataReader Class
PgSqlDataReader Members

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