1. 使用maven構(gòu)建SpringBoot的名叫spring-boot-jpa項目

2. Spring Data jpa的啟動器、mysq數(shù)據(jù)庫和c3p0緩存池的jar

3. pom.xml

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.bjbs</groupId><artifactId>spring-boot-jpa</artifactId><version>0.0.1-SNAPSHOT</version><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.13.RELEASE</version></parent><!-- 修改jdk版本 --><properties><java.version>1.8</java.version></properties><dependencies><!-- springBoot的啟動器 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- springBoot jpa的啟動器 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency><!-- mysql --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.27</version></dependency><dependency><groupId>com.mchange</groupId><artifactId>c3p0</artifactId><version>0.9.2</version></dependency></dependencies> </project>

4. 在src/main/resources下, 新建application.properties, 在這里配置數(shù)據(jù)庫信息即可。

spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver spring.datasource.url=jdbc:mysql://192.168.25.138:3306/StudyMybatis?useSSL=true&useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai spring.datasource.username=root spring.datasource.password=lyw123456spring.datasource.type=com.mchange.v2.c3p0.ComboPooledDataSourcespring.jpa.hibernate.ddl-auto=update spring.jpa.show-sql=true

5. 新建User.java

package com.bjbs.pojo;import java.io.Serializable; import java.util.Date; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.Table; import org.springframework.format.annotation.DateTimeFormat;@Entity//實體類 @Table(name = "user")//指定數(shù)據(jù)庫表名 public class User implements Serializable {private static final long serialVersionUID = 1L;@Id//主鍵@GeneratedValue(strategy = GenerationType.IDENTITY)// 主鍵生成策略@Column(name = "id")//指定表中的列名private Integer id;@Column(name = "name")private String name;@Column(name = "sex")private String sex;@Column(name = "birthday")@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")private Date birthday;@Column(name = "address")private String address;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Overridepublic String toString() {return "User [id=" + id + ", name=" + name + ", sex=" + sex + ", birthday=" + birthday + ", address=" + address+ "]";} }

6. 新建UserRepository.java

package com.bjbs.dao;import org.springframework.data.jpa.repository.JpaRepository; import com.bjbs.pojo.User;/*** 參數(shù)一T: 當前需要映射的實體; 參數(shù)二 T: 當前映射的實體中的id的類型*/ public interface UserRepository extends JpaRepository<User, Integer> {}

7. 新建UserService.java

package com.bjbs.service;import com.bjbs.pojo.User;public interface UserService {User updateUserById(Integer id); }

8. 新建UserServiceImpl.java

package com.bjbs.service.impl;import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import com.bjbs.dao.UserRepository; import com.bjbs.pojo.User; import com.bjbs.service.UserService;@Service @Transactional public class UserServiceImpl implements UserService {@Autowiredprivate UserRepository userRepository;@Overridepublic User updateUserById(Integer id) {User userDb = userRepository.findOne(id);userDb.setAddress("河南省鄭州市高新區(qū)");return userRepository.save(userDb);} }

9. 新建UserController.java

package com.bjbs.controller;import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.bjbs.pojo.User; import com.bjbs.service.UserService;@RestController public class UserController {@Autowiredprivate UserService userService;@RequestMapping("update")public User update() {return userService.updateUserById(32);} }

10. 新建App.java

package com.bjbs;import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication;/*** springBoot啟動類*/ @SpringBootApplication public class App {public static void main(String[] args) {SpringApplication.run(App.class, args);} }

11. 數(shù)據(jù)庫user表

12. 運行項目?

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