You can use the SELECT INTO statement to export formatted data to a file.

Data Export with an SQL Query

The following query exports data into a file formatted in comma-separated values (CSV):

SELECT City, CompanyName INTO [csv://[HarperDB].[cstest].Cutomers.txt] FROM [[HarperDB].[cstest].Cutomers] WHERE Country = 'US'

You can specify other formats in the file URI. The possible delimiters are tab, semicolon, and comma with the default being a comma. The following example exports tab-separated values:

SELECT City, CompanyName INTO [csv://[HarperDB].[cstest].Cutomers.txt;delimiter=tab] FROM [[HarperDB].[cstest].Cutomers] WHERE Country = 'US'

C#

String connectionString = "Server=127.0.0.1;User=admin;Password=1234;Port=9925;";

using (HarperDBConnection connection = new HarperDBConnection(connectionString)) {
  HarperDBCommand cmd = new HarperDBCommand("SELECT City, CompanyName INTO [csv://[HarperDB].[cstest].Cutomers.txt] FROM [[HarperDB].[cstest].Cutomers] WHERE Country = 'US' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "Server=127.0.0.1;User=admin;Password=1234;Port=9925;" 

Using connection As New HarperDBConnection(connectionString)
  Dim cmd As New HarperDBCommand("SELECT City, CompanyName INTO [csv://[HarperDB].[cstest].Cutomers.txt] FROM [[HarperDB].[cstest].Cutomers] WHERE Country = 'US'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using

You can specify other file formats in the URI. The following example exports tab-separated values:

C#

String connectionString = "Server=127.0.0.1;User=admin;Password=1234;Port=9925;";

using (HarperDBConnection connection = new HarperDBConnection(connectionString)) {
  HarperDBCommand cmd = new HarperDBCommand("SELECT * INTO [[HarperDB].[cstest].Cutomers] IN [csv://filename=c:/[HarperDB].[cstest].Cutomers.csv;delimiter=tab] FROM [[HarperDB].[cstest].Cutomers] WHERE Country = 'US'", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "Server=127.0.0.1;User=admin;Password=1234;Port=9925;" 

Using connection As New HarperDBConnection(connectionString)
  Dim cmd As New HarperDBCommand("SELECT * INTO [[HarperDB].[cstest].Cutomers] IN [csv://filename=c:/[HarperDB].[cstest].Cutomers.csv;delimiter=tab] FROM [[HarperDB].[cstest].Cutomers] WHERE Country = 'US'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using