execute raises an exception on error

ext/mysql2/statement.c

@@ -51,7 +51,8 @@ static VALUE execute(VALUE self)
   MYSQL_STMT * stmt;
   Data_Get_Struct(self, MYSQL_STMT, stmt);
 
-  mysql_stmt_execute(stmt);
+  if(mysql_stmt_execute(stmt))
+    rb_raise(cMysql2Error, "%s", mysql_stmt_error(stmt));
 
   return self;
 }

spec/mysql2/statement_spec.rb

@@ -50,4 +50,9 @@ describe Mysql2::Statement do
     stmt.prepare 'SELECT 1'
     stmt.execute.should == stmt
   end
+
+  it "should raise an exception on error" do
+    stmt = @client.create_statement
+    lambda { stmt.execute }.should raise_error(Mysql2::Error)
+  end
 end