The technical principles and applications of Pojava's persistent framework

Pojava is a persistent framework that provides a simple and powerful way to achieve the persistence of the Java object.Its technical principles and application scenarios are as follows: Technical principle: Pojava's reflection mechanism based on Java realizes the mapping relationship between objects and databases.It uses annotations to identify the mapping relationship between the attributes of the Java object and the field of the database table.By using the POJAVA API, developers can easily save the Java object into the database or obtain the Java object from the database without having to write tedious SQL statements. Application scenario: 1. The persistence storage of the object: Use POJAVA to save the Java object directly into the database without manually writing the SQL statement to perform the insertion operation.For example, assuming that there is a Java class called User, which is used to represent user information.Using Pojava, you can save user information into the database in the following way: @DBTable("users") public class User { @DBField("id") private int id; @DBField("name") private String name; // getters and setters } // Save user information to the database User user = new User(); user.setId(1); user.setName("John Doe"); POJava.save(user); 2. Database query operation: By using the POJAVA query API, you can easily obtain the Java object from the database without writing complex query statements.The following is an example code that is used to obtain user information called "John Doe" from the database: // Inquiry users who are called "John Doe" User user = POJava.query(User.class) .where("name", "=", "John Doe") .findFirst(); 3. Database update operation: Use Pojava to easily update the Java object information in the database.The following is an example code, which is used to update the user's name to "Jane Smith": // Update the user name as "Jane Smith" User user = POJava.query(User.class) .where("name", "=", "John Doe") .findFirst(); user.setName("Jane Smith"); POJava.update(user); Summarize: Pojava is a powerful framework for the persistence of the Java object. It is based on the reflection mechanism and annotation identification to achieve a mapping relationship between the object and the database.By using Pojava, developers can easily save the Java object into the database, obtain the Java object from the database, and perform database update operations, thereby simplifying the development process.