Core concepts and key components in the UJO ORM framework

The UJO ORM framework, called Universal Java Object Framework, is a lightweight Java ORM (object relationship mapping) framework.It provides a simple and easy -to -use way to handle the mapping relationship between the Java object and the relational database. The UJO ORM framework has some core concepts and key components, which will be introduced below. 1. Ujo UJO is the core interface of the UJO ORM framework, which indicates the mapping relationship between a Java object and the database table.By implementing the UJO interface, we can define and operate the attributes of the Java object. 2. UjoManager Ujomanager is a manager of the UJO ORM framework, which provides some static methods to manage UJO objects.Through UJOMANAGER, we can create, save, update, and delete the UJO object. 3. UjoAction UjoAction is the behavior interface of the UJO ORM framework, which is used to define a series of functions related to database operations.By implementing the UjoACTION interface, we can customize the code logic that requires execution before and after database operations, such as verification and log records. 4. UjoEntityManager UjoentityManager is a physical manager of the UJO ORM framework, which is used to manage the physical object of the UJO framework.Through UjoentityManager, we can perform the persistence, merger, refreshing and deleting operation of the physical object. 5. MetaUjo Metaujo is the meta object of the UJO ORM framework, which is used to describe the metadata information of the UJO object.Metal data includes information names, types, length and other information.Through Metaujo, we can obtain and modify the attribute metadata of the UJO object. The above is the core concept and key components in the UJO ORM framework.The following will show how to use the UJO ORM framework for programming and related configurations in a simple example. First of all, we need to import the related dependencies of the UJO ORM framework into our Java project.Then, we can define a Java class as our physical object, implement the UJO interface, and define some attributes and methods. public class User implements Ujo { private int id; private String name; // Getters and setters public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } } Next, we can use Ujomanager to create and save our User object. public class Main { public static void main(String[] args) { User user = new User(); user.setId(1); user.setName("John Doe"); UjoManager.getInstance().save(user); } } In the above example, we created a User object, set its ID and name properties, and then saved it into the database using the SAVE method of Ujomanager. In addition to the above code examples, we also need to configure the UJO ORM framework, such as database connection information and mapping rules.The specific configuration method can be determined according to the actual situation, and the configuration can usually be configured through the configuration file. To sum up, the UJO ORM framework is a simple and easy to use Java ORM framework that provides some core concepts and key components to handle the mapping relationship between the Java object and the database.By understanding and using these concepts and components, we can more conveniently perform database operations and avoid complicated SQL statements.