Added back in basic benchmark support. To run:

ruby benchmark/benchmark.rb --adapter mysql --num 1000
  ruby benchmark/benchmark.rb --adapter mysql --num 1000 --to-csv /tmp/results.csv
  ruby benchmark/benchmark.rb --adapter mysql --num 1000 --to-html /tmp/results.html

benchmarks/lib/mysql_benchmark.rb

@@ -0,0 +1,22 @@
+class MysqlBenchmark < BenchmarkBase
+    
+  def benchmark_all( array_of_cols_and_vals )
+    methods = self.methods.find_all { |m| m =~ /benchmark_/ }
+    methods.delete_if{ |m| m =~ /benchmark_(all|model)/ }
+    methods.each { |method| self.send( method, array_of_cols_and_vals ) }
+  end
+  
+  def benchmark_myisam( array_of_cols_and_vals )
+    bm_model( TestMyISAM, array_of_cols_and_vals )
+  end
+    
+  def benchmark_innodb( array_of_cols_and_vals )
+    bm_model( TestInnoDb, array_of_cols_and_vals )
+  end
+  
+  def benchmark_memory( array_of_cols_and_vals )
+    bm_model( TestMemory, array_of_cols_and_vals )
+  end
+    
+end
+