UJO ORM framework technical principle and its application analysis in the Java class library

UJO ORM framework technical principle and its application analysis in the Java class library introduction: ORM (object relationship mapping) is a technology that maps the object and the relationship database, which aims to simplify the database operation.UJO ORM is an ORM framework based on the Java language. It provides powerful data access and persistent functions, and has some high -level features.This article will introduce the technical principles of Ujo ORM and analyze its application in the Java class library. 1. Technical principle of the UJO ORM framework: The design of the UJO ORM framework is object -oriented data access and persistence.It maps the Tables in the Java object and a relationship database to implement the conversion between the object and the database.The UJO ORM framework is mainly based on the following principles: 1. Comment driver: UJO ORM identifies the mapping relationship between the Java object and the database table.Using annotations can simplify the development process. Developers only need to add annotations to the attributes of the Java class to specify the corresponding relationship between attributes and table fields. 2. Object relationship mapping: UJO ORM uses metadata to define the relationship between objects, mapping the tables in the relational database as the Java object, and map the field in the table to the attributes of the Java object.In this way, developers can directly operate the database operation by operating the Java object without manually writing the SQL statement. 3. Database connection management: The UJO ORM framework provides a unified database connection management to realize the ease of use and efficiency of database access.It uses the connection pool technology to manage the database connection object, which can effectively reduce the number of creation and destruction of the database connection, and improve the performance and resource utilization rate of the system. 4. Affairs management: The UJO ORM framework has built -in transaction management functions, and supports developers to manage database operations.By adding transaction annotations to the code, automatic transaction management of database operations can be achieved to ensure the consistency and integrity of the operation. 2. UJO ORM's application analysis in the Java class library: The UJO ORM framework, as a powerful data access and persistence tool, is widely used in the Java class library.The following is several typical application scenarios of UJO ORM in the Java library: 1. Database access: Using the UJO ORM framework, developers can easily access database access.By defining the mapping relationship between the Java object and the database table, developers can operate the database through simple Java code.UJO ORM provides some commonly used database operation methods, such as querying, inserting, updating and deleting, which greatly simplifies the process and code of database operations. The following is a simple example code that demonstrates the process of using UJO ORM for database query operations: @Table(name = "user") public class User { @Id @Column(name = "id") private Long id; @Column(name = "name") private String name; // omit the getter and setter method } // Query all users public List<User> getAllUsers() { return UjoManager.getInstance().createQuery(User.class).list(); } // Query the user according to the ID public User getUserById(Long id) { return UjoManager.getInstance().find(User.class, id); } 2. Object persistence: The UJO ORM framework can persist the Java object into a relational database.By defining the mapping relationship between objects and tables, developers can store the Java object into the database, or read the Java object from the database.UJO ORM can automatically handle operations such as increasedness, modification and deletion of objects, which greatly simplifies the persistence process of the object. Below is a simple example code that shows the process of using UJO ORM for the persistence operation of objects: @Table(name = "user") public class User { @Id @Column(name = "id") private Long id; @Column(name = "name") private String name; // omit the getter and setter method } // Create a user public void createUser(User user) { UjoManager.getInstance().save(user); } // Update users public void updateUser(User user) { UjoManager.getInstance().update(user); } // delete users public void deleteUser(User user) { UjoManager.getInstance().delete(user); } in conclusion: The UJO ORM framework is a powerful ORM technology, which is widely used in the Java class library.By mapping between Java objects and relational databases, Ujo Orm implements simplified data access and persistence functions.By learning and application of the UJO ORM framework, developers can improve development efficiency, simplify database operations, and achieve object -oriented data access and persistence.