How to Use ActiveJDBC in Java to Implement Database Operations

ActiveJDBC is a lightweight Java ORM framework primarily used to simplify interaction with databases. It is based on the ActiveRecord mode and provides a concise and intuitive API, making it very convenient to use. The main advantages of ActiveJDBC include: 1. Easy to use: ActiveJDBC's API design is very concise, providing methods similar to database operations, allowing developers to easily perform database operations such as adding, deleting, modifying, and querying. 2. Lightweight: ActiveJDBC is a very lightweight framework without too many additional dependencies, making it very concise and efficient to use. 3. High performance: ActiveJDBC can provide high performance at the data access level by using dynamic proxy and cache technology. 4. Flexibility: ActiveJDBC supports the execution of custom SQL statements and provides rich query syntax to meet the needs of complex queries. 5. Support for multiple databases: ActiveJDBC supports various popular relational databases, including MySQL, Oracle, PostgreSQL, etc. Some drawbacks of ActiveJDBC include: 1. Relatively small community support: Compared to other mainstream Java ORM frameworks, ActiveJDBC has relatively small community support and relatively few related documents and resources. 2. Relatively incomplete documentation: There are relatively few official documents for ActiveJDBC, and many issues need to be resolved through source code or other channels. The following is the complete sample code for implementing database operations using ActiveJDBC: Firstly, we need to add the dependency of ActiveJDBC in the pom.xml file of the project: <dependency> <groupId>org.javalite</groupId> <artifactId>activejdbc</artifactId> <version>2.1</version> </dependency> Then, create a data representation example, for example, create a data table named "users" with the following table structure: sql CREATE TABLE `users` ( `id` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(255) NOT NULL, `password` varchar(255) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; Next, create the User class, inherit the ActiveRecord class, and define the corresponding data table mapping relationship. The code is as follows: import org.javalite.activejdbc.Model; public class User extends Model { static { validatePresenceOf("username", "password"); } } Next, in Java code, the User class can be used for database operations, such as: public class Main { public static void main(String[] args) { //Initialize database connection Base.open("com.mysql.jdbc.Driver", "jdbc:mysql://localhost/mydb", "root", "password"); //Create a new user User user = new User(); user.set("username", "admin"); user.set("password", "123456"); user.save(); //Query users based on criteria List<User> users = User.where("username = ?", "admin"); for (User u : users) { System.out.println("Username: " + u.get("username")); System.out.println("Password: " + u.get("password")); } //Update user information User user = User.findFirst("username = ?", "admin"); user.set("password", "newpassword"); user.save(); //Delete User User user = User.findFirst("username = ?", "admin"); user.delete(); //Close database connection Base.close(); } } In the above code, we first initialize the database connection using the 'Base. open()' method, then use the User class to perform database operations, such as creating users, querying users, updating users, and deleting users. Finally, we close the database connection using the 'Base. close()' method. Reference link: ActiveJDBC official website: http://javalite.io/activejdbc