无论如何，我无法在Hibernate中批处理MySQL INSERT语句
2022-09-01 12:12:29
我目前正面临着众所周知的常见休眠插入批处理问题。
我需要保存 500 万行长的批次。我首先尝试使用更轻的有效载荷。由于我必须插入只有 2 种类型的实体（首先是 A 类型的所有记录，然后是 B 类型的所有记录，都指向通用类型 C 父项），因此我想充分利用 JDBC 批量插入的优势。ManyToOne
我已经阅读了很多文档，但是我尝试过的任何文档都没有工作。
-
我知道为了使用批处理插入，我不得使用实体生成器。所以我删除了ID，我用一个技巧设置ID：每次都递增。
AUTO_INCREMENTSELECT MAX(ID) FROM ENTITIES - 我知道我必须定期刷新会话。我会提前发布代码，但无论如何，我每500个元素执行一次交易。
-
我知道我必须设置与应用程序的批量大小一致，所以我将其设置为（Spring ORM集成）
hibernate.jdbc.batch_sizeLocalSessionFactoryBean - 我知道我必须启用在连接URL中重写批处理语句。
这是我的实体
公共父实体。这将首先插入到单个事务中。我在这里不关心自动增量列。每个批处理作业只有一条记录
@Entity
@Table(...)
@SequenceGenerator(...)
public class Deal
{
@Id
@Column(
name = "DEAL_ID",
nullable = false)
@GeneratedValue(
strategy = GenerationType.AUTO)
protected Long id;
................
}
其中一个子级（假设每批 250 万条记录）
@Entity
@Table(
name = "TA_LOANS")
public class Loan
{
@Id
@Column(
name = "LOAN_ID",
nullable = false)
protected Long id;
@ManyToOne(
optional = false,
targetEntity = Deal.class,
fetch = FetchType.LAZY)
@JoinColumn(
name = "DEAL_ID",
nullable = false)
protected Deal deal;
.............
}
其他子类型。假设其他250万条记录
@Entity
@Table(
name = "TA_BONDS")
public class Bond
{
@Id
@Column(
name = "BOND_ID")
@ManyToOne(
fetch = FetchType.LAZY,
optional = false,
targetEntity = Deal.class)
@JoinColumn(
name = "DEAL_ID",
nullable = false,
updatable = false)
protected Deal deal;
}
插入记录的简化代码
long loanIdCounter = loanDao.getMaxId(), bondIdCounter = bondDao.getMaxId(); //Perform SELECT MAX(ID)
Deal deal = null;
List<Bond> bondList = new ArrayList<Bond>(COMMIT_BATCH_SIZE); //500 constant value
List<Loan> loanList = new ArrayList<Loan>(COMMIT_BATCH_SIZE);
for (String msg: inputStreamReader)
{
log.debug(msg.toString());
if (this is a deal)
{
Deal deal = parseDeal(msg.getMessage());
deal = dealManager.persist(holder.deal); //Called in a separate transaction using Spring annotation @Transaction(REQUIRES_NEW)
}
else if (this is a loan)
{
Loan loan = parseLoan(msg.getMessage());
loan.setId(++loanIdCounter);
loan.setDeal(deal);
loanList.add(loan);
if (loanList.size() == COMMIT_BATCH_SIZE)
{
loanManager.bulkInsert(loanList); //Perform a bulk insert in a single transaction, not annotated but handled manually this time
loanList.clear();
}
}
else if (this is a bond)
{
Bond bond = parseBond(msg.getMessage());
bond.setId(++bondIdCounter);
bond.setDeal(deal);
bondList.add(bond);
if (bondList.size() == COMMIT_BATCH_SIZE) //As above
{
bondManager.bulkInsert(bondList);
bondList.clear();
}
}
}
if (!bondList.isEmpty())
bondManager.bulkInsert(bondList);
if (!loanList.isEmpty())
loanManager.bulkInsert(loanList);
//Flush remaining items, not important
实现：bulkInsert
@Override
public void bulkInsert(Collection<Bond> bonds)
{
// StatelessSession session = sessionFactory.openStatelessSession();
Session session = sessionFactory.openSession();
try
{
Transaction t = session.beginTransaction();
try
{
for (Bond bond : bonds)
// session.persist(bond);
// session.insert(bond);
session.save(bond);
}
catch (RuntimeException ex)
{
t.rollback();
}
finally
{
t.commit();
}
}
finally
{
session.close();
}
}
正如您从评论中看到的，我已经尝试了有状态/无状态的几种组合。没有一个奏效。session
My 是具有以下 URL 的组合池数据源dataSource
<b:property name="jdbcUrl" value="jdbc:mysql://server:3306/db?autoReconnect=true&rewriteBatchedStatements=true" />
我SessionFactory
<b:bean id="sessionFactory" class="class.that.extends.org.springframework.orm.hibernate3.LocalSessionFactoryBean" lazy-init="false" depends-on="dataSource">
<b:property name="dataSource" ref="phoenixDataSource" />
<b:property name="hibernateProperties">
<b:props>
<b:prop key="hibernate.dialect">${hibernate.dialect}</b:prop> <!-- MySQL5InnoDb-->
<b:prop key="hibernate.show_sql">${hibernate.showSQL}</b:prop>
<b:prop key="hibernate.jdbc.batch_size">500</b:prop>
<b:prop key="hibernate.jdbc.use_scrollable_resultset">false</b:prop>
<b:prop key="hibernate.cache.use_second_level_cache">false</b:prop>
<b:prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</b:prop>
<b:prop key="hibernate.cache.use_query_cache">false</b:prop>
<b:prop key="hibernate.validator.apply_to_ddl">false</b:prop>
<b:prop key="hibernate.validator.autoregister_listeners">false</b:prop>
<b:prop key="hibernate.order_inserts">true</b:prop>
<b:prop key="hibernate.order_updates">true</b:prop>
</b:props>
</b:property>
</b:bean>
即使我的项目范围类扩展，它也不会覆盖其方法（只添加一些项目范围的方法）LocalSessionFactoryBean
几天后我就生气了。我读了几篇文章，但没有一篇帮助我启用批量插入。我从使用Spring上下文检测的JUnit测试中运行我的所有代码（所以我可以我的类）。我所有的尝试都只产生了很多单独的陈述。@AutowireINSERT
- https://stackoverflow.com/questions/12011343/how-do-you-enable-batch-inserts-in-hibernate
- https://stackoverflow.com/questions/3469364/faster-way-to-batch-saves-with-hibernate
- https://forum.hibernate.org/viewtopic.php?p=2374413
- https://stackoverflow.com/questions/3026968/high-performance-hibernate-insert
我错过了什么？
