Application cases of Korm framework in the Java library

The Korm framework is a lightweight Java persistence framework. It provides a simple and easy -to -use API that can quickly map the Java object into a relational database.The following is an application case of the Korm framework in the Java library, covering a complete programming code and related configuration. Case background: Assuming that we are developing a student management system, we need to persist the data of the student object into a relational database.We choose to use the Korm framework to simplify the development of the data access layer. Step 1: Add dependencies First of all, we need to add the Korm framework to the project's Build.gradle file: groovy dependencies { implementation 'com.github.pengrad:korm:0.6.0' // Other dependencies ... } Step 2: Create a database table Next, we need to create a database table called "Students" to store data for student objects.You can use the following SQL statements to create tables in the database: sql CREATE TABLE students ( id INT PRIMARY KEY, name VARCHAR(255), age INT, class_id INT ); Step 3: Define the physical class Then, we need to define a Java class called "Student". This class represents students and uses the annotation of the Korm framework to mappore the attribute to the database table field. import com.github.pengrad.korm.Korm; public class Student { // omit other attributes @Korm.Id private int id; private String name; private int age; private int classId; // omit the constructive method, Getter and Setter method } Step 4: Configure the data source In the configuration file of the application, we need to configure the database connection information so that the Korm framework can be connected to the relational database.The following is a typical configuration example: properties # Database connection configuration db.url=jdbc:mysql://localhost:3306/mydatabase db.username=root db.password=123456 Step 5: Use the Korm framework for data access Now, we can use the Korm framework in the code to perform CRUD operations.Here are some common operation examples: import com.github.pengrad.korm.Korm; public class Main { public static void main(String[] args) { // Initialize the Korm framework Korm.initFromProperties("config.properties"); // Create a student object Student Student = New Student (1, "Zhang San", 18, 1); // Insert the student object into the database Korm.insert(student); // Check the student object through ID Student retrievedStudent = Korm.findById(Student.class, 1); System.out.println(retrievedStudent.getName()); // Update the attributes of the student object retrievedStudent.setAge(19); Korm.update(retrievedStudent); // Delete the student object from the database Korm.delete(retrievedStudent); } } The above example demonstrates how to use the Korm framework to map the student objects into the database and perform insertion, query, update and delete operations. In summary, the application cases of the Korm framework in the Java library include adding dependencies, creating database tables, defining entity classes, configuration data sources, and using the Korm framework for data access.Through simple annotations and API calls, we can quickly realize the persistent operation of relational databases.