How to view the SQL queries issued by Hibernate to set transaction level and autocommit

On my MySQL server, in the general logs I see a large number of logs that look like this: 2023-03-31T09:31:23.208-07:002023-03-31T16:31:23.208345Z37028QuerySETautocommit=02023-03-31T09: 31:23.211-07:002023-03-31T16:31:23.211201Z36956Querysetsessiontransaction

P粉734486718 2023-09-13 10:04:00 0 1 231

What does the number 6 in the MySQL DATETIME field mean?

I can't find it in DATETIME, but usually I define it as DATETIME without precision specifier. When running Hibernate automatic DDL update, I noticed that it changes the table to DATETIME(6)

P粉147747637 2023-08-09 14:34:58 0 2 227

java - When a web application built using Springboot is running, can the database table be automatically generated and used?

1. Let’s talk about the premise first: the spring application is built using spring boot; Hibernate is used, and spring-boot-starter-data-jpa is added to the pom; the database is MySql; the development tool is IDEA. I've never done web development before, and I don't know much about databases, so I'...

仅有的幸福 2017-07-05 10:46:15 0 1 1067

java - Distributed transaction processing solution

Do you need distributed transactions when deploying hibernate on multiple web servers to operate the database? Will there be any problems using the traditional stand-alone method to access the database? How does the industry deal with this problem?

女神的闺蜜爱上我 2017-06-23 09:14:37 0 1 784

java - When SpringMVC integrates hibernate validator for parameter verification, why doesn't it throw an exception directly?

Hello everyone, I have a question: 1. Environment {code...} 2. The configuration is as follows {code...} 3. Bean and Controller {code...} {code...} Question: Why must it be in the code Use result.hasErrors() to display judgment? Can't it be verified that the fields in the UserRequest do not meet the...

天蓬老师 2017-06-23 09:13:55 0 2 609

java - Partial thread SessionException: Session is closed! when Hibernate adds operation under high concurrency conditions.

Servlet + hibernate will cause org.hibernate.SessionException: Session is closed! in some threads under high concurrency conditions, but it will not occur under single-threaded conditions. {code...} BaseDAO.java {code...}

我想大声告诉你 2017-06-12 09:22:23 0 2 732

java - Is hibernate's setString method obsolete?

There is a strikethrough in setString. Is there any alternative?

高洛峰 2017-06-10 09:49:04 0 2 578

How to solve Hibernate's multi-threading problem?

I have a page that implements a function. Triggering this function will execute two java functions at the same time, thereby triggering two Hibernate operations. After executing this function, the system will issue this Exception from time to time: {code...} I personally think It's because the sessi...

淡淡烟草味 2017-05-17 10:07:17 0 1 369

How Hibernate handles entity classes with variable number of parameters

Assume that an object Object has several parameters, and the name and number of the parameters are uncertain. In this case, I would like to know how the data table should be designed to be more suitable for Hibernate to operate. I have worked out a solution before (I want to hear the master complain...

我想大声告诉你 2017-05-17 10:06:59 0 1 374

java - Is the data queried by Hibernate stored in the session?

I just learned Hibernate for a while, but after learning about Java serialization, I learned that Hibernate's persistence is serialized into memory, and the last time the data is taken out is deserialization. However, I have a question. Hibernate's get and other queries are through serialization. Is...

習慣沉默 2017-05-17 10:04:34 0 1 358

java - hibernate forward engineering generates one-to-many relationship model without error, but only one table is generated

I am now going to do forward engineering. The one-to-many relationship between User customers and Order orders. Below is their entity class {code...} Below is the hbm.xml configuration file {code...} Have I checked all other configurations? Problem, there is no problem with hibernate.cfg.xml (two en...

我想大声告诉你 2017-05-17 10:04:01 0 1 378

java - Is there any verification annotation to detect duplicate content in the list?

A certain interface requires the caller to pass a list. A certain string attribute in the object in the list cannot be repeated. Is there such an annotation to quickly determine whether there is duplicate data? I searched for hibernate verification and found no such thing. How do you usually deal wi...

为情所困 2017-05-17 10:03:54 0 2 444

java - What is the difference between select and subselect in Hibernate's fetch attribute? Are there any usage scenarios?

As mentioned, thank you for your pointers

高洛峰 2017-05-17 10:03:48 0 1 336

java - In hibernate bidirectional many-to-many relationship, how to automatically update the intermediate table when one of the parties is modified?

In the many-to-many relationship between the employee table and the department table, when setting up the department collection through the employee table, it was found that the intermediate table automatically deleted records, but no updated data was inserted, as follows: Reference: Employee table:...

阿神 2017-05-17 10:03:35 0 2 381

java - Hibernate batch insert data always inserts incompletely

When using hibernate to insert data into the database, I found that only a part of the total of more than 2,000 pieces of data could be inserted into the database. When debugging, I found that the object was indeed created in the loop and the save() method was called. My code is as follows {code. .....

某草草 2017-05-17 09:59:07 0 1 396

Does jdbcTemplate support mapping of complex objects?

{Code...} Can you use jdbcTemplate to map the result set into the above complex objects (that is, an object is also associated with an object or a collection of objects)? If you don't use mybatis or hibernate, is there any other way to facilitate mapping?

PHPz 2017-05-17 09:58:27 0 1 534

angular.js - 后端使用angularjs不起作用，应该是哪里冲突还是怎么地，有经验的吗

我的是springMVC、hibernate之类做的，开始做了一大堆用easyui做的，后来又想试试用angularjs去做一点功能，但是，加入angularjs的文件后，在 代码中angularjs都不起作用的........ 到底是冲突呢？还是angularjs...

迷茫 2017-05-15 17:00:51 0 1 378

redis - hibernate 映射实体，里面有多对一，一般用实体，还是实体ID

我现在在开发一套系统,在orm时打算用hibernate。 {代码...} 的确用类的话，查询会比较方便，但是后期分布式部署,要把mission放入缓存，打算用redis,可是redis不能序列化mission中的member。所以用那个方案比较健...

给我你的怀抱 2017-04-24 16:01:00 0 0 496

Hibernate3.X源码转换成本地Eclipse项目

由于最近想研究Hibernate的运行原理，从Github上搞了一份Hibernate的源码，可是整理到本地Eclipse里总是报错，不知有没有大神研究过Hibernate项目的分支开发？

PHPz 2017-04-21 10:58:04 0 1 524

java - mybatis中的n+1问题和hibernate中的n+1问题时什么原因引起的？

mybatis中的n+1问题和hibernate中的n+1问题时什么原因引起的呢？为啥用join就能解决

阿神 2017-04-18 10:56:40 0 0 319