Java 使用hibernate本机查询进行批插入

下面是在迭代中执行insert查询的代码：

session = sessionFactory.getCurrentSession();

        for (SampleBO items : listCTN) {    
            try {    
                query = session
                        .createSQLQuery("insert into xyx values(.......) where items="+items.getItem());

                OBJLOG.info("query executed is" + query);               
                query.executeUpdate();
                result = "success";
            }

---

这里查询一个接一个地执行。如何批量执行查询

首先，如果要在hibernate中使用正确的JDBC语句批处理，必须在hibernate的配置中设置batch size参数。根据Hibernate的文档，“5到30之间的建议值”：

然后，在循环中，必须每插入X次刷新会话（X应与为批大小设置的数字相匹配）。应该是这样的：

int count = 0;
for (SampleBO items : listCTN) {      
    query = session
            .createSQLQuery("insert into xyx values(.......) where items="+items.getItem());
    OBJLOG.info("query executed is" + query);               
    query.executeUpdate();
    result = "success";

    if (++count % 30 == 0){
        session.flush();
        session.clear();
    }
}
//optional - I've seen issues in hibernate caused by not flushing data for the last iteration, for example -  the last 10 inserts.
session.flush();
session.clear();

另请参见：

int count = 0;
for (SampleBO items : listCTN) {      
    query = session
            .createSQLQuery("insert into xyx values(.......) where items="+items.getItem());
    OBJLOG.info("query executed is" + query);               
    query.executeUpdate();
    result = "success";

    if (++count % 30 == 0){
        session.flush();
        session.clear();
    }
}
//optional - I've seen issues in hibernate caused by not flushing data for the last iteration, for example -  the last 10 inserts.
session.flush();
session.clear();