Korm framework Introduction: Practical tools in the Java class library

Korm framework Introduction: Practical tools in the Java class library The Korm framework is a class library for Java developers.It aims to simplify the development process and improve the maintenance and readability of the code.This article will introduce the Korm framework and some functions provided, and provide the corresponding Java code example. 1. Object-Relationship Map (ORM) function The Korm framework provides a powerful ORM function, making the mapping between the Java object and the relational database easier.Developers can use Korm to define the mapping relationship between the physical class and the database table, as well as the mapping relationship between the field and the column.The following is a simple example: import com.korm.annotations.*; @Entity(tableName = "users") public class User { @Id @Column(name = "id") private int id; @Column(name = "name") private String name; // omit other fields and methods } Using the Korm framework, developers can easily perform CRUD operations by writing a physical class similar to the above example without manually writing SQL statements. 2. Data verification and verification function The Korm framework also provides the function of data verification and verification to help developers ensure the correctness and integrity of the data.Developers can use Korm to check the fields in the physical class, and can customize the verification rules.The following is a simple example: import com.korm.annotations.*; @Entity(tableName = "users") public class User { @Id @Column(name = "id") private int id; @Column(name = "name") @NotNull @Size (min = 2, max = 20, message = "User name length should be between 2 and 20") private String name; // omit other fields and methods } In the above examples, Korm Note @Notnull and @size are used to verify whether the value of the name field is empty and the length is within the specified range.By using these annotations, developers can effectively verify data. 3. Query the builder The Korm framework also provides a powerful query construct to build a complex database query statement.Developers can use simple methods chain calls to combine query conditions, sorting rules, etc., without the need to stitch string string.The following is an example: import com.korm.query.*; // ... Query<User> query = new QueryBuilder<>(User.class); query.where("age", ">", 18) .where("gender", "=", "Female") .orderBy("name", SortOrder.ASC) .limit(10); List<User> users = query.execute(); By using the Korm's query construct, developers can easily build complex query statements and obtain qualified results sets. Summarize: The Korm framework provides Java developers with many practical tools and functions, including object-relationship mapping, data verification and verification, query builder, etc.By using the Korm framework, developers can simplify the development process, improve the maintenance and readability of the code, and complete the project more efficiently.