diff --git a/Chapter 3/mybatis-demo/src/main/java/geektime/spring/data/mybatisdemo/MybatisDemoApplication.java b/Chapter 3/mybatis-demo/src/main/java/geektime/spring/data/mybatisdemo/MybatisDemoApplication.java
index f94b33e..5454d2f 100644
--- a/Chapter 3/mybatis-demo/src/main/java/geektime/spring/data/mybatisdemo/MybatisDemoApplication.java	
+++ b/Chapter 3/mybatis-demo/src/main/java/geektime/spring/data/mybatisdemo/MybatisDemoApplication.java	
@@ -27,11 +27,16 @@ public class MybatisDemoApplication implements ApplicationRunner {
 	public void run(ApplicationArguments args) throws Exception {
 		Coffee c = Coffee.builder().name("espresso")
 				.price(Money.of(CurrencyUnit.of("CNY"), 20.0)).build();
-		Long id = coffeeMapper.save(c);
-		log.info("Coffee {} => {}", id, c);
+		int count = coffeeMapper.save(c);
+		log.info("Save {} Coffee: {}", count, c);
 
-		c = coffeeMapper.findById(id);
-		log.info("Coffee {}", c);
+		c = Coffee.builder().name("latte")
+				.price(Money.of(CurrencyUnit.of("CNY"), 25.0)).build();
+		count = coffeeMapper.save(c);
+		log.info("Save {} Coffee: {}", count, c);
+
+		c = coffeeMapper.findById(c.getId());
+		log.info("Find Coffee: {}", c);
 	}
 }
 
diff --git a/Chapter 3/mybatis-demo/src/main/java/geektime/spring/data/mybatisdemo/mapper/CoffeeMapper.java b/Chapter 3/mybatis-demo/src/main/java/geektime/spring/data/mybatisdemo/mapper/CoffeeMapper.java
index e869dd5..0148f13 100644
--- a/Chapter 3/mybatis-demo/src/main/java/geektime/spring/data/mybatisdemo/mapper/CoffeeMapper.java	
+++ b/Chapter 3/mybatis-demo/src/main/java/geektime/spring/data/mybatisdemo/mapper/CoffeeMapper.java	
@@ -14,7 +14,7 @@ public interface CoffeeMapper {
     @Insert("insert into t_coffee (name, price, create_time, update_time)"
             + "values (#{name}, #{price}, now(), now())")
     @Options(useGeneratedKeys = true)
-    Long save(Coffee coffee);
+    int save(Coffee coffee);
 
     @Select("select * from t_coffee where id = #{id}")
     @Results({