如何度量hibernate性能？

如何在hibernate中度量性能？我想知道hibernate执行一个查询需要多少时间？

你的意思是字面上的查询还是查询+将数据转换成Java对象

无论哪种方式，如果你想科学化，使用像JProbe这样的分析工具可能是一种选择。您不必花钱，Eclipse中也有一些免费工具

在最简单的情况下，只要在所讨论的代码周围添加一些print语句就足够了，前提是您所测量的内容是主要的处理

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要真正彻底地进行性能分析，需要非常小心。通常，您需要多次重复您正在测试的内容，以确保您不会被初始开销（例如打开与数据库的连接）误导。不要忘记，数据库和性能可能是至关重要的，hibernate本身无法对调优不好的数据库采取任何措施。

我建议使用以下一种或几种选项：

• 数据库探查器（e.q.SqlServer探查器）
• Hibernate的内置统计信息（请参阅：）
• Hibernate分析器（请参阅：，）

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JProfiler 7.1有一个JPA/Hibernate探测器：

下面是一个显示其工作原理的屏幕演示：

热点视图如下所示：

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免责声明：当我使用Spring Hibernate进行开发时，我的公司会开发JProfiler 我通常使用以下属性
在my application.properties文件中查看 查询执行时间和查询执行方式：

spring.jpa.properties.hibernate.show_sql=true
spring.jpa.properties.hibernate.use_sql_comments=true
spring.jpa.properties.hibernate.format_sql=true
spring.jpa.properties.hibernate.generate_statistics=true

日志输出示例如下所示：

Hibernate: 
select
    order0_.OrderID as OrderID1_4_0_,
    order0_.customerID as customer2_4_0_,
    order0_.employeeID as employee3_4_0_,
    order0_.freight as freight4_4_0_,
    order0_.orderDate as orderDat5_4_0_,
    order0_.requiredDate as required6_4_0_,
    order0_.shipAddress as shipAddr7_4_0_,
    order0_.shipCity as shipCity8_4_0_,
    order0_.shipCountry as shipCoun9_4_0_,
    order0_.shipName as shipNam10_4_0_,
    order0_.shipPostalCode as shipPos11_4_0_,
    order0_.shipRegion as shipReg12_4_0_,
    order0_.shipVia as shipVia13_4_0_,
    order0_.shippedDate as shipped14_4_0_,
    customer1_.customerID as customer1_2_1_,
    customer1_.address as address2_2_1_,
    customer1_.city as city3_2_1_,
    customer1_.companyName as companyN4_2_1_,
    customer1_.contactName as contactN5_2_1_,
    customer1_.contactTitle as contactT6_2_1_,
    customer1_.country as country7_2_1_,
    customer1_.fax as fax8_2_1_,
    customer1_.phone as phone9_2_1_,
    customer1_.postalCode as postalC10_2_1_,
    customer1_.region as region11_2_1_ 
from
    orders order0_ 
left outer join
    customers customer1_ 
        on order0_.customerID=customer1_.customerID 
where
    order0_.OrderID=?
Hibernate: 
select
    orderdetai0_.OrderID as OrderID6_3_0_,
    orderdetai0_.ID as ID1_3_0_,
    orderdetai0_.ID as ID1_3_1_,
    orderdetai0_.discount as discount2_3_1_,
    orderdetai0_.OrderID as OrderID6_3_1_,
    orderdetai0_.productID as productI3_3_1_,
    orderdetai0_.quantity as quantity4_3_1_,
    orderdetai0_.unitPrice as unitPric5_3_1_ 
from
    order_details orderdetai0_ 
where
    orderdetai0_.OrderID=?

Session Metrics {
281879 nanoseconds spent acquiring 1 JDBC connections;
0 nanoseconds spent releasing 0 JDBC connections;
276015 nanoseconds spent preparing 2 JDBC statements;
1702274 nanoseconds spent executing 2 JDBC statements;
0 nanoseconds spent executing 0 JDBC batches;
0 nanoseconds spent performing 0 L2C puts;
0 nanoseconds spent performing 0 L2C hits;
0 nanoseconds spent performing 0 L2C misses;
0 nanoseconds spent executing 0 flushes (flushing a total of 0 entities and 0 collections);
0 nanoseconds spent executing 0 partial-flushes (flushing a total of 0 entities and 0 collections)}

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谢谢你的回复。你有没有在hibernate中为性能分析提供任何特定的免费工具或eclipse插件？我在谷歌上看到过，我自己从未使用过，但肯定值得一看？