Java後端愛上SpringBoot 第五節:SpringBoot 批量提交
阿新 • • 發佈:2019-01-01
Java後端愛上SpringBoot 第五節:Spring-Data-JPA批量提交
PS:因為專案中用到了批量提交,因此來記錄一下幾種批量提交的方式。
Spring-Data-JPA批量提交
隨便找一個實體的Repository來進行提交:
貼一下單元測試類:
@Test
public void test9() {
Optional<SysUser> optional = iSysUserRepository.findById("2c987c3167a23e990167a240e0c80008");
Long startTime=System.currentTimeMillis();
if (optional.isPresent()) {
List<SysUser> sysUsers = new ArrayList<>(10000);
// 提交1W個
for (int i = 0; i < 10000; i++) {
SysUser sysUser = new SysUser();
sysUser=optional.get ();
sysUser.setId(String.valueOf(i));
sysUsers.add(sysUser);
}
iSysUserRepository.saveAll(sysUsers);
}
Long endTime=System.currentTimeMillis();
System.out.println("耗時:"+(endTime-startTime)+"ms");
}
提交時間為:
又測了一次:
好慢啊!看一下saveAll()這個方法的原始碼。
於是我們找到了org.springframework.data.jpa.repository.support.SimpleJpaRepository<T, ID>的saveAll方法。
@Transactional
public <S extends T> List<S> saveAll(Iterable<S> entities) {
Assert.notNull(entities, "The given Iterable of entities not be null!");
List<S> result = new ArrayList<S>();
for (S entity : entities) {
result.add(save(entity));
}
return result;
}
再去看一下save方法:
@Transactional
public <S extends T> S save(S entity) {
if (entityInformation.isNew(entity)) {
em.persist(entity);
return entity;
} else {
return em.merge(entity);
}
}
發現每提交一個實體都會去 isNew 一下,去資料庫查詢這個實體是不是新的,如果是新的則進行提交,否則則進行update,於是乎我們自己實現一個EntityManager 提交的方法。
EntityManager批量提交
我們改造一下EntityManager的批量提交的方法,不用isNew來進行提交:
Optional<SysUser> optional = iSysUserRepository.findById("2c987c3167a23e990167a240e0c80008");
SysUser user = optional.get();
List<SysUser> sysUsers = new ArrayList<>();
Long startTime = System.currentTimeMillis();
if (optional.isPresent()) {
// 提交1W個
for (int i = 0; i < 10000; i++) {
SysUser sysUser = new SysUser();
sysUser.setEmail(user.getEmail());
sysUser.setLoginName(user.getLoginName());
sysUser.setPassword(user.getPassword());
sysUser.setPhone(user.getPhone());
sysUser.setStatus(user.getStatus());
sysUser.setUserName(user.getUserName());
sysUser.setModitime(new Date());
sysUser.setSysOrganization(user.getSysOrganization());
sysUser.setSysRoles(sysUser.getSysRoles());
sysUser.setSysStation(sysUser.getSysStation());
sysUsers.add(sysUser);
}
for (int i = 0; i < sysUsers.size(); i++) {
entityManager.persist(sysUsers.get(i));
if (i % 50 == 0) {
entityManager.flush();
entityManager.clear();
}
}
}
Long endTime = System.currentTimeMillis();
System.out.println("耗時:" + (endTime - startTime) + "ms");
效率略有提升。再測一下。
提交了10W資料,20秒。
NamedParameterJdbcTemplate批量提交
使用NamedParameterJdbcTemplate進行批量提交
@Autowired
private NamedParameterJdbcTemplate namedParameterJdbcTemplate;
//......
Optional<SysUser> optional = iSysUserRepository.findById("2c987c3167a23e990167a240e0c80008");
SysUser user = optional.get();
List<SysUser> sysUsers = new ArrayList<>();
Long startTime = System.currentTimeMillis();
if (optional.isPresent()) {
// 提交1W個
for (int i = 0; i < 10000; i++) {
SysUser sysUser = new SysUser();
sysUser.setId(String.valueOf(i));
sysUser.setEmail(user.getEmail());
sysUser.setLoginName(user.getLoginName());
sysUser.setPassword(user.getPassword());
sysUser.setPhone(user.getPhone());
sysUser.setStatus(user.getStatus());
sysUser.setUserName(user.getUserName());
sysUser.setModitime(new Date());
sysUser.setSysOrganization(user.getSysOrganization());
sysUser.setSysRoles(sysUser.getSysRoles());
sysUser.setSysStation(sysUser.getSysStation());
sysUsers.add(sysUser);
}
String sql = "insert into sys_user(id,email,login_name,moditime,password,phone,status,user_name) values (:id,:email,:loginName,:moditime,:password,:phone,:status,:userName)";
SqlParameterSource[] sqlParameterSource = SqlParameterSourceUtils.createBatch(sysUsers);
namedParameterJdbcTemplate.batchUpdate(sql, sqlParameterSource);
Long endTime = System.currentTimeMillis();
System.out.println("耗時:" + (endTime - startTime) + "ms");
}
再測一下
居然要50秒。