这期内容当中小编将会给大家带来有关如何解析springboot整合JPA过程,文章内容丰富且以专业的角度为大家分析和叙述,阅读完这篇文章希望大家可以有所收获。
接下来具体看看是怎么弄的。
1、新建一个springboot项目,选择web、data jdbc、data jpa、mysql driver。
2、建立以下目录及结构:
pom.xml
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.4.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.gong</groupId> <artifactId>springbootjpa</artifactId> <version>0.0.1-SNAPSHOT</version> <name>springbootjpa</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jdbc</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.41</version> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>
3、在application.yml中配置连接数据库和jpa相关配置
spring: datasource: url: jdbc:mysql://192.168.124.22:3306/jpa username: root password: 123456 driver-class-name: com.mysql.jdbc.Driver jpa: hibernate: #更新或者创建数据表结构 ddl-auto: update #控制台显示SQL show-sql: true
4、新建一个entity包,新建实体类User.java
package com.gong.springbootjpa.entity;import com.fasterxml.jackson.annotation.JsonIgnoreProperties;import javax.persistence.*;//使用JPA注解配置映射关系@Entity //告诉JPA这是一个实体类(和数据表映射的类)@Table(name = "tbl_user") //@Table来指定和哪个数据表对应;如果省略默认表名就是user;@JsonIgnoreProperties(value = {"hibernateLazyInitializer","handler"})public class User { @Id //这是一个主键 @GeneratedValue(strategy = GenerationType.IDENTITY)//自增主键 private Integer id; @Column(name = "last_name",length = 50) //这是和数据表对应的一个列 private String lastName; @Column //省略默认列名就是属性名 private String email; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; }}
5、新建一个repository包,新建一个UserRepository.java
package com.gong.springbootjpa.repository;import com.gong.springbootjpa.entity.User;import org.springframework.data.jpa.repository.JpaRepository;//继承JpaRepository来完成对数据库的操作,在JdbcRepository中指定实体类,数据库中主键对应的java类型public interface UserRepository extends JpaRepository<User,Integer> {}
6、新建一个controller包,新建一个UserController.java
经过上述配置之后,我们就可以直接利用UserRepository中的一些方法进行数据库的操作啦,是不是很方便。
package com.gong.springbootjpa.controller;import com.gong.springbootjpa.entity.User;import com.gong.springbootjpa.repository.UserRepository;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class UserController { @Autowired UserRepository userRepository; @GetMapping("/user/{id}") public User getUser(@PathVariable("id") Integer id){ User user = userRepository.getOne(id); return user; } @GetMapping("/user") public User insertUser(User user){ User save = userRepository.save(user); return save; }}
7、启动服务器
插入一条数据
查询一条数据
上述就是小编为大家分享的如何解析springboot整合JPA过程了,如果刚好有类似的疑惑,不妨参照上述分析进行理解。如果想知道更多相关知识,欢迎关注亿速云行业资讯频道。
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