An UPSERT statement updates an existing record or creates a new record if an existing record is not identified.

UPSERT Syntax

The UPSERT syntax is the same as for INSERT. HarperDB uses the input provided in the VALUES clause to determine whether the record already exists. If the record does not exist, all columns required to insert the record must be specified. See Data Model for any table-specific information.

UPSERT INTO <table_name> 
( <column_reference> [ , ... ] )
VALUES 
( { <expression> | NULL } [ , ... ] ) 
  

<expression> ::=
  | @ <parameter> 
  | ?
  | <literal>

You can use the ExecuteNonQuery method to issue data manipulation commands and retrieve the rows affected, as shown in the following example:

C#

String connectionString = "Server=127.0.0.1;User=admin;Password=1234;Port=9925;";
int rowsAffected;
using (HarperDBConnection connection = new HarperDBConnection(connectionString)) {
  HarperDBCommand cmd = new HarperDBCommand("UPSERT INTO [HarperDB].[cstest].Cutomers (CompanyName) VALUES ('RSSBus Inc.')", connection);
  rowsAffected = cmd.ExecuteNonQuery();
}

VB.NET

Dim connectionString As [String] = "Server=127.0.0.1;User=admin;Password=1234;Port=9925;"
Dim rowsAffected As [Integer]
Using connection As New HarperDBConnection(connectionString)
  Dim cmd As New HarperDBCommand("UPSERT INTO [HarperDB].[cstest].Cutomers (CompanyName) VALUES ('RSSBus Inc.')", connection)
  rowsAffected = cmd.ExecuteNonQuery()
End Using