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This article will explain in detail how to use loyom-crud-spring-boot-starter to build CRUD back-end API. The content of the article is of high quality, so the editor will share it with you for reference. I hope you will have some understanding of the relevant knowledge after reading this article.

The framework loyom-crud-spring-boot-starter is built on SpringBoot's Web and JPA, so only SpringBoot projects are supported

First of all:

Let's set up a Java maven project first. The pom configuration is as follows:

4.0.0 org.springframework.boot spring-boot-starter-parent 2.2.1.RELEASE com.loyom crud-demo 1.0-SNAPSHOT UTF-8 UTF-8 1.8 UTF-8 1.8 1.8 com.loyom loyom-crud-spring- Boot-starter 1.1.RELEASE org.springframework.boot spring-boot-maven-plugin loyom-public loyom public http://oen.im/nexus/repository/maven-public/ True always warn true always warn

Because the framework jar has not been released to the central warehouse, it is now used

Http://oen.im/nexus/repository/maven-public/

Warehouse address

Configure the pom file before setting application.yml

Server: port: 8080 session-timeout: 1800 connection-timeout: 5000spring: application: name: CrudDemo profiles: dev jackson: # date format date-format: yyyy-MM-dd HH:mm:ss serialization: # format output indent_output: true # ignore unconvertible objects fail_on_empty_beans: true # set empty how to serialize defaultPropertyInclusion: ALWAYS Deserialization: # allows objects to ignore attributes that do not exist in json fail_on_unknown_properties: false parser: # allows special characters and escape character allow_unquoted_control_chars: true # allows single quotation marks allow_single_quotes: true datasource: url: jdbc:mysql://127.0.0.1:3306/db_test?useUnicode=true&autoReconnect=true&failOverReadOnly=false&characterEncoding=UTF-8& UseSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true username: root password: 123456789 driver-class-name: com.mysql.cj.jdbc.Driver max-active: 100 max-idle: 8 min-idle: 8 initial-size: 10 validation-query: select 1 max-wait-millis: 10000 jpa: generate-ddl: true show-sql: true database: mysql properties: {"hibernate.naming.physical-strategy": "org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy"} Hibernate: use-new-id-generator-mappings: false enable_lazy_load_no_trans: true naming: physical-strategy: org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy configuration: map-underscore-to-camel-case: truelogging: path:. / logs level: com.loyom: debug

After the configuration is done,

Need to set up an empty database db_test in the database

Create database `db_ test` default charset utf8mb4 collate utf8mb4_bin

Because automatic table creation is configured in the configuration, you don't have to create the table manually and now you can start writing code.

First, create a startup class:

Package com.loyom.crud.demo;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class DemoLauncher {public static void main (String [] args) {SpringApplication.run (DemoLauncher.class, args);}}

Write another database class:

Package com.loyom.crud.demo;import javax.persistence.*;@Entity@Table (name = "test_data") public class TestData {@ Id @ GeneratedValue (strategy = GenerationType.AUTO) @ Column (name = "id", nullable = false, length = 18) private Long id; @ Column (name = "name", nullable = false, length = 50) private String name; @ Column (name = "level", nullable = false) private Integer level Column (name = "create_time", nullable = false, length = 14) private Long createTime; public Long getId () {return id;} public void setId (Long id) {this.id = id;} public String getName () {return name;} public void setName (String name) {this.name = name;} public Integer getLevel () {return level } public void setLevel (Integer level) {this.level = level;} public Long getCreateTime () {return createTime;} public void setCreateTime (Long createTime) {this.createTime = createTime;}}

And create a database operation class:

Package com.loyom.crud.demo;import com.loyom.crud.annotation.CrudController;import com.loyom.crud.service.AbsDao;@CrudController ("test") public interface TestDao extends AbsDao {}

All right, it's done. Now start the project to access the Crud operation on TestData..

The API accessed is prefixed with / crud/ {name configured in CrudController} / operation

The name of the CrudController annotation configuration in this demo is test, so

The available API are:

/ crud/test/create create an object

/ crud/test/delete deletes an object according to ID

/ crud/test/update updates an object according to ID

/ crud/test/find queries the list of objects according to the criteria

/ crud/test/count counts the number of objects according to the condition

/ crud/test/findById queries objects according to ID

/ crud/test/page makes page turning query according to the conditions.

The front end can carry on the corresponding CRUD operation according to these API.

What don't you think is enough?

Then you can add the around attribute to the CrudController annotation

@ CrudController (value = "test", around = MethodAroundHandler.class)

You only need to inherit the MethodAroundHandler class and override the methods inside to implement your own customized query.

So the input data of the creation API in the above picture looks different from the created data. It is because the relevant methods are overwritten and modified in the custom MethodAroundHandler class, so the input class capacity is different from the actual creation. Support custom oh.

So much for sharing about how to use loyom-crud-spring-boot-starter to build CRUD back-end API. I hope the above content can be helpful to you and learn more. If you think the article is good, you can share it for more people to see.

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