Detailed introduction of the Korm framework in the Java Class Library

The Korm framework is a Java -based ORM (object relationship mapping) tool for simplifying the development process of interacting with relational databases.ORM is a programming technology that allows developers to operate the database in an object -oriented manner without having to directly write SQL query statements. Korm provides a set of simple and easy -to -use APIs that allow developers to use the Java class and objects to represent database tables and records.It simplifies the database operation by automatically mapped the Java object to the database table and provides common addition, deletion, and investigation operations.Therefore, developers can focus more on business logic rather than database details. The following is the example code and related configuration files using the Korm framework: 1. Import Korm framework: First of all, to use the Korm framework, you need to add the following dependencies in the construction configuration file (such as Maven's pom.xml): <dependency> <groupId>com.korm</groupId> <artifactId>korm-core</artifactId> <version>1.0.0</version> </dependency> 2. Create a physical class: Use the Korm framework to define the physical class corresponding to the database table.For example, consider a physical class that represents the user `user`: @Table(name = "users") public class User { @Id private Long id; @Column(name = "username") private String username; // Getters and setters } In the above code, the `@table` annotation is used to specify the table name,`@id` annotation specifies the main key field, and the name of the note specifies the name name. 3. Configure database connection: In the application file (such as Application.properties), you need to add a database connection related configuration information, such as database URL, user name and password. properties # Database Connection Settings db.url=jdbc:mysql://localhost:3306/mydb db.username=root db.password=123456 4. Use Korm for database operation: The database operation using the Korm framework is very simple.Here are some common examples: -An query all users: List<User> users = Korm.select(User.class).list(); -Find the user according to the condition: User user = Korm.select(User.class) .where("username", "admin") .getFirst(); -In insert new users: User newUser = new User(); newUser.setUsername("john.doe"); Korm.insert(newUser); -Update user information: User userToUpdate = Korm.select(User.class) .where("username", "john.doe") .getFirst(); if (userToUpdate != null) { userToUpdate.setUsername("jane.doe"); Korm.update(userToUpdate); } - delete users: User userToDelete = Korm.select(User.class) .where("username", "jane.doe") .getFirst(); if (userToDelete != null) { Korm.delete(userToDelete); } Summarize: The Korm framework simplifies the interaction between Java and relational databases, providing a high -level abstract layer that enables developers to perform database operations in an object -oriented way.This article introduces the basic concepts and use examples of the Korm framework, including the definition of physical class, database connection configuration, and common database operations.Using the Korm framework can make developers easier to use Java to interact with databases to improve development efficiency.