SpringBoot JdbcTemplate批量操作的示例代码

public class AppStudent {
 private Integer id;
 private Integer classId;
 private String name;
 private Integer age;
 //伪代码、省略构造和get、set方法
}

@Repository
public class DynamicQueryImpl implements DynamicQuery {

 @PersistenceContext
 private EntityManager em;

 public EntityManager getEntityManager() {
  return em;
 }
 //其实就是for循环、使用EntityManager的persist方法循环保存而已
 @Override
 public <T> void saveList(List<T> resultList) {
  for (int i = 0; i < resultList.size(); i++) {
   T t = resultList.get(i);
   em.persist(t);
  }
 }
}

@Autowired
private JdbcTemplate jdbcTemplate;

 public void batchSave(){
  List<Object[]> batchArgs=new ArrayList<Object[]>();
  batchArgs.add(new Object[]{1,"小明",21});
  batchArgs.add(new Object[]{2,"小红",22});
  batchArgs.add(new Object[]{3,"露西",23});
  String sql = "insert into user (username,password) values (?,?)";
  jdbcTemplate.batchUpdate(sql, batchArgs);
}

@Autowired
private NamedParameterJdbcTemplate namedParameterJdbcTemplate;

public void batchSave(){
 List<User> list = new ArrayList<User>();
 //新增用户
 list.add(new AppStudent(1,"张三",21));
 list.add(new AppStudent(1,"李四",22));
 list.add(new AppStudent(1,"王二麻子",23));
 //批量转数组
 SqlParameterSource[] beanSources = SqlParameterSourceUtils.createBatch(list.toArray());
 String sql = "INSERT INTO app_student(class_id,name,age) VALUES (:classId,:name,:age)";
 namedParameterJdbcTemplate.batchUpdate(sql, beanSources);
}

long start = System.currentTimeMillis();
//改造前后代码、自行补充
long end = System.currentTimeMillis();
System.out.println("花费时间:"+(end-start));