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Recently, I have to digest a little more knowledge. I write notes in my blog for easy viewing You can download the hibernate jar package you need on the official website Configuring Sqlserver database in Hibernate <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernat ...

HQL statement In Hibernate, although simple primary key query statements can be generated directly by Hibernate using the API, complex query statements need our own handwriting. Hibernate provides us with an HQL statement to use. HQL is the abbreviation of Hibernate Query Language, HQL is a statement close to SQL, b ...

1. Project construction preparation 1. Build Maven web project 2. Import the jar package required by the project <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="h ...

HQL is the abbreviation of Hibernate Query Language, which provides more flexible and powerful query capabilities; HQL is closer to SQL query syntax. query Query all (persistent data) // s: aliases must be aliased to objects, not *. Not in hibernate* String hql="select s from Student s"; //The Que ...

Compared with spring, one of the most important characteristics of spring boot is automatic configuration, which makes the Convention larger than the configuration idea successfully implemented. XXX spring boot starter a series of bootstrappers can be used out of the box, or only need a few configurations (for beginners) because the default aut ...

title: Delete foreign key constraint fails date: 2018-08-02 21:59:06 tags: database --- When I was learning hibernate at that time, I just learned one to many, many to many related operations. It happens that there is an item just in time, and the structure of the tables should be sorted out. As the saying goes, we need to use it when we learn ...

1.find method First, override the toString method in the entity class @Override public String toString() { return "Customer{" + "id=" + id + ", lastName='" + lastName + '\'' + ", email='" + email + '\'' + ", age=" + age + ", createdTime=" ...

1. what is correlation (association) 1.1 Association refers to the reference relationship between classes. If class A is associated with class B, the referenced class B will be defined as the property of class A. For example: t_hibernate_order t_hibernate_order_item An order corresponds to multiple or ...

I. Preface In some scenarios, we need to verify whether the code is duplicated, whether the account number is duplicated, whether the ID number is duplicated, etc. Codes like validation are as follows: So is there any way to solve this similar amount of duplicate code? We can achieve this by customizing annotation validation, as follows by add ...

Two of the most attractive things about Go, besides goroutine, that is, channel, I've been wondering how select ion actually works. As in my previous article, some irrelevant code is omitted directly 1. Overview of structure 1.1. hchan This is the structure of channel. type hchan struct { qcount uint // Total data in queues da ...