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hibernate mysql dialect 8 unexpected tag: ENGINE

I'm using hibernate to connect to mysql database. As suggested in various tutorials, I set my application properties as follows: spring.datasource.jdbcUrl=jdbc:mysql://localhost:3306/test_schemaspring.datasource.username=rootspring.datasource.password =spring.jpa.properti

P粉938936304 2024-03-26 13:41:02 0  1  655

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...}

我想大聲告訴你 2017-06-12 09:22:23 0  2  1190

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  667

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(xí)慣沉默 2017-05-17 10:04:34 0  1  726

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...

我想大聲告訴你 2017-05-17 10:06:59 0  1  678

One-to-many mapping Hibernate

I'm trying to keep 6 comments in the Comment table of the database using a foreign key to the post id, but the last 3 comments overwrite the first 3 comments with the newly added foreign key. Test class: Commentscomments=newComments("1stComment",newDate(System.currentTimeMillis()));Comment...

P粉770375450 2024-04-01 19:57:24 0  2  892

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...

淡淡煙草味 2017-05-17 10:07:17 0  1  674

Disable local connection query for Hibernate NonUniqueDiscoveredSqlAliasException

I want to join some tables using native queries in SpringBoot. The query looks like this: SELECT*FROMemployeeASeINNERJOINcONe.id=c.employee_idINNERJOINbONc.arw_id=b.arw_idINNERJOINaONb.ap_id=a.id Now, I receive HibernateNonUniqueDiscoveredSqlAliasExcep on [id] and [arw_id]

P粉852114752 2024-02-21 13:50:47 0  1  707

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  729

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?

女神的閨蜜愛上我 2017-06-23 09:14:37 0  1  1365

Unable to insert values ??into mysql database using spring boo

Hibernate: Inserting employee (age, name) values ??(?,?) I don't know how to fix it, I tried everything but until I get this error. How to solve this problem, I searched on google, stack overflow but I didn't find the exact solution.

P粉488464731 2024-03-22 13:11:21 0  1  834

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  821

angular.js - Using angularjs on the backend does not work. Is there a conflict or something? Does anyone have experience with it?

Mine is made of springMVC, hibernate, etc. I started to make a lot of things using easyui, and then I wanted to try using angularjs to do some functions. However, after adding the angularjs file, angularjs did not work in the code. ........ What exactly is a conflict? Or angularjs...

迷茫 2017-05-15 17:00:51 0  1  632

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  683

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...

為情所困 2017-05-17 10:03:54 0  2  729

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'...

僅有的幸福 2017-07-05 10:46:15 0  1  1479

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...

天蓬老師 2017-06-23 09:13:55 0  2  1012

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...

我想大聲告訴你 2017-05-17 10:04:01 0  1  667

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  703

Laravel Modal does not return data

I don't know why I'm not getting the value from the modal in my Laravel controller. Please check it for me. However, I use the same code for other modes and controllers. It's working and returning the value from the property without any issues. I'm using Laravel8 and php8.1; below is my code. app\Ht...

P粉174151913 2024-03-29 10:31:31 0  1  592