// Executes a Select SQL statement.
 private static function SQLRetrieve(LJCDataManager $manager)
 {
   $nameValue = "NameValue";
   $methodName = "SQLRetrieve()";
 
   $data = new LJCDbColumns();
   $data->Add("Name", value: $nameValue);
   $affectedCount = $manager->Add($data);
 
   // Retrieve with SQLRetrieve().
   // See constructor for how to create $manager.
   $keys = new LJCDbColumns();
   $keys->Add("Name", value: $nameValue);
   $sql = $manager->RetrieveSQL($keys);
   $rows = $manager->SQLRetrieve($sql);
   if (null == $rows
     || !is_array($rows)
     || 0 == count($rows))
   {
     echo($manager->SQL);
     echo("\r\n{$methodName} No data retrieved.");
   }
 
   // $sql =
   // select
   //   TableName.ID,
   //   TableName.Name
   // from TableName
   // where TableName.Name = 'NameValue'
 
   $keys = new LJCDbColumns();
   $keys->Add("Name", value: $nameValue);
   $affectedCount = $manager->Delete($keys);
 }