我正在尝试使用 Hibernate(JPA) 在 5 秒内向 MYSQL 表中插入 100,000 行。我已经尝试了 hibernate 提供的所有技巧，但仍然无法做得比 35 秒更好。
第一个优化：我从 IDENTITY 序列生成器开始，这导致插入需要 60 秒。后来我放弃了序列生成器并开始分配@Id通过阅读来充实自己MAX(id)并使用AtomicInteger.incrementAndGet()自己分配字段。这将插入时间缩短至 35 秒。
第二次优化：我通过添加启用了批量插入
<prop key="hibernate.jdbc.batch_size">30</prop>
<prop key="hibernate.order_inserts">true</prop>
<prop key="hibernate.current_session_context_class">thread</prop>
<prop key="hibernate.jdbc.batch_versioned_data">true</prop>
到配置。我惊讶地发现批量插入完全没有减少插入时间。还有35秒！
现在，我正在考虑尝试使用多线程插入。
有人有任何指点吗？我应该选择 MongoDB 吗？
下面是我的配置：
1.休眠配置
`
<bean id="entityManagerFactoryBean" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.progresssoft.manishkr" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
<prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
<prop key="hibernate.jdbc.batch_size">30</prop>
<prop key="hibernate.order_inserts">true</prop>
<prop key="hibernate.current_session_context_class">thread</prop>
<prop key="hibernate.jdbc.batch_versioned_data">true</prop>
</props>
</property>
</bean>
<bean class="org.springframework.jdbc.datasource.DriverManagerDataSource"
id="dataSource">
<property name="driverClassName" value="${database.driver}"></property>
<property name="url" value="${database.url}"></property>
<property name="username" value="${database.username}"></property>
<property name="password" value="${database.password}"></property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactoryBean" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
`
- 实体配置：
`
@Entity
@Table(name = "myEntity")
public class MyEntity {
@Id
private Integer id;
@Column(name = "deal_id")
private String dealId;
....
....
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "timestamp")
private Date timestamp;
@Column(name = "amount")
private BigDecimal amount;
@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "source_file")
private MyFile sourceFile;
public Deal(Integer id,String dealId, ....., Timestamp timestamp, BigDecimal amount, SourceFile sourceFile) {
this.id = id;
this.dealId = dealId;
...
...
...
this.amount = amount;
this.sourceFile = sourceFile;
}
public String getDealId() {
return dealId;
}
public void setDealId(String dealId) {
this.dealId = dealId;
}
...
...
....
public BigDecimal getAmount() {
return amount;
}
public void setAmount(BigDecimal amount) {
this.amount = amount;
}
....
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
`
- 持久代码（服务）：
`
@Service
@Transactional
public class ServiceImpl implements MyService{
@Autowired
private MyDao dao;
....
`void foo(){
for(MyObject d : listOfObjects_100000){
dao.persist(d);
}
}
`
4.Dao类：
`
@Repository
public class DaoImpl implements MyDao{
@PersistenceContext
private EntityManager em;
public void persist(Deal deal){
em.persist(deal);
}
}
`
Logs:
`
DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:32.906 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:32.906 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:32.906 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:32.906 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:32.906 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:32.906 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:32.906 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:32.906 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:32.906 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:32.906 [http-nio-8080-exec-2]
...
...
DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:34.002 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:34.002 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:34.002 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:34.002 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:34.002 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:34.002 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:34.002 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:34.002 [http-nio-8080-exec-2] DEBUG o.h.e.j.batch.internal.BatchingBatch - Executing batch size: 27
18:26:34.011 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - update deal_source_file set invalid_rows=?, source_file=?, valid_rows=? where id=?
18:26:34.015 [http-nio-8080-exec-2] DEBUG o.h.e.j.batch.internal.BatchingBatch - Executing batch size: 1
18:26:34.018 [http-nio-8080-exec-2] DEBUG o.h.e.t.i.jdbc.JdbcTransaction - committed JDBC Connection
18:26:34.018 [http-nio-8080-exec-2] DEBUG o.h.e.t.i.jdbc.JdbcTransaction - re-enabling autocommit
18:26:34.032 [http-nio-8080-exec-2] DEBUG o.s.orm.jpa.JpaTransactionManager - Closing JPA EntityManager [org.hibernate.jpa.internal.EntityManagerImpl@2354fb09] after transaction
18:26:34.032 [http-nio-8080-exec-2] DEBUG o.s.o.jpa.EntityManagerFactoryUtils - Closing JPA EntityManager
18:26:34.032 [http-nio-8080-exec-2] DEBUG o.h.e.j.internal.JdbcCoordinatorImpl - HHH000420: Closing un-released batch
18:26:34.032 [http-nio-8080-exec-2] DEBUG o.h.e.j.i.LogicalConnectionImpl - Releasing JDBC connection
18:26:34.033 [http-nio-8080-exec-2] DEBUG o.h.e.j.i.LogicalConnectionImpl - Released JDBC connection
'
