Spring Boot 2.x基础教程：使用JdbcTemplate访问MySQL数据库

Author: dyc87112

2.1.x/chapter3-1/src/main/java/com/didispace/chapter31/UserServiceImpl.java

@@ -20,8 +20,7 @@ public class UserServiceImpl implements UserService {
 
     @Override
     public int create(String name, Integer age) {
-        int row = jdbcTemplate.update("insert into USER(NAME, AGE) values(?, ?)", name, age);
-        return row;
+        return jdbcTemplate.update("insert into USER(NAME, AGE) values(?, ?)", name, age);
     }
 
     @Override
@@ -37,20 +36,17 @@ public List<User> getByName(String name) {
 
     @Override
     public int deleteByName(String name) {
-        int row = jdbcTemplate.update("delete from USER where NAME = ?", name);
-        return row;
+        return jdbcTemplate.update("delete from USER where NAME = ?", name);
     }
 
     @Override
     public int getAllUsers() {
-        int row = jdbcTemplate.queryForObject("select count(1) from USER", Integer.class);
-        return row;
+        return jdbcTemplate.queryForObject("select count(1) from USER", Integer.class);
     }
 
     @Override
     public int deleteAllUsers() {
-        int row = jdbcTemplate.update("delete from USER");
-        return row;
+        return jdbcTemplate.update("delete from USER");
     }
 
 }

2.1.x/chapter3-1/src/test/java/com/didispace/chapter31/Chapter31ApplicationTests.java

@@ -14,6 +14,8 @@
 import org.springframework.test.web.servlet.setup.MockMvcBuilders;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.util.List;
+
 import static org.hamcrest.Matchers.equalTo;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
@@ -42,6 +44,10 @@ public void test() throws Exception {
         userSerivce.create("Oscar", 21);
         userSerivce.create("Linda", 17);
 
+        // 查询名为Oscar的用户，判断年龄是否匹配
+        List<User> userList = userSerivce.getByName("Oscar");
+        Assert.assertEquals(21, userList.get(0).getAge().intValue());
+
         // 查数据库，应该有5个用户
         Assert.assertEquals(5, userSerivce.getAllUsers());