java - 如何验证 hibernate.jdbc.batch_size 是否正常工作？

Question

在我的 hibernate 属性中 30

在我的代码中我做了类似的事情

final StatelessSession sSession = sessionFactory.openStatelessSession();
try {
    sSession.connection().setAutoCommit(false);
} catch (final SQLException se) {
    // log a message
}
final Transaction tx = sSession.beginTransaction();
try{
    for ( some loop ) {
        Customer customer = new Customer(.....);
        sSession.insert(customer);
        /* Do we need to flush a stateless session? It doesn't have methods for it
        if ( i % 30 == 0 ) { //30, same as the JDBC batch size
            //flush a batch of inserts and release memory:
            sSession.flush();
            sSession.clear();
        }
        */
    } 
    //sSession.flush();// Do we need to flush a stateless session? It doesn't have methods for it
    //sSession.clear();
} finally{
    tx.commit();
    sSession.close();
}

我的 Pojo 有以下内容

@Id
//@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ID", nullable = false, unique = true)
private Long id;

但是，当我更改批处理大小时，它似乎不会影响整体运行时间。我如何验证它是否确实有效？

谢谢!

Answer 1

注释掉 session.flush(); 并查看在 20 次循环交互后是否插入了任何内容

更新:更新问题

评论 //@GeneratedValue(strategy = GenerationType.AUTO) 应该回退到默认值，即 AFAIK Identity

尝试使用

@TableGenerator(name="TABLE_GEN", table="SEQUENCE_TABLE", pkColumnName="SEQ_NAME", valueColumnName="SEQ_COUNT", pkColumnValue="EMP_SEQ")
@GeneratedValue(strategy=GenerationType.TABLE, generator="TABLE_GEN")