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Spring Boot 2.x基础教程：使用PostgreSQL
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‎2.x/README.md‎

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- [Spring Boot 2.x基础教程：使用MongoDB](http://blog.didispace.com/spring-boot-learning-24-6-1/)
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- [Spring Boot 2.x基础教程：使用LDAP来管理用户与组织数据](http://blog.didispace.com/spring-boot-learning-24-6-2/)
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- [Spring Boot 2.x基础教程：使用时序数据库InfluxDB](http://blog.didispace.com/spring-boot-learning-2-6-3/)
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- [Spring Boot 2.x基础教程：使用PostgreSQL](http://blog.didispace.com/spring-boot-learning-2-6-4/)
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### Web开发
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‎2.x/README_zh.md‎

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- [Spring Boot 2.x基础教程：使用MongoDB](http://blog.didispace.com/spring-boot-learning-24-6-1/)
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- [Spring Boot 2.x基础教程：使用LDAP来管理用户与组织数据](http://blog.didispace.com/spring-boot-learning-24-6-2/)
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- [Spring Boot 2.x基础教程：使用时序数据库InfluxDB](http://blog.didispace.com/spring-boot-learning-2-6-3/)
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- [Spring Boot 2.x基础教程：使用PostgreSQL](http://blog.didispace.com/spring-boot-learning-2-6-4/)
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### Web开发
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‎2.x/chapter6-4/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.didispace</groupId>
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<artifactId>chapter6-4</artifactId>
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<version>1.0.0</version>
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<packaging>jar</packaging>
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<description>使用PostgreSQL数据库</description>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.5.1</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-jpa</artifactId>
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</dependency>
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<dependency>
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<groupId>org.postgresql</groupId>
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<artifactId>postgresql</artifactId>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎2.x/chapter6-4/src/main/java/com/didispace/chapter64/Chapter64Application.java‎

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package com.didispace.chapter64;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.scheduling.annotation.EnableScheduling;
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@SpringBootApplication
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public class Chapter64Application {
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public static void main(String[] args) {
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SpringApplication.run(Chapter64Application.class, args);
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}
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}

‎2.x/chapter6-4/src/main/java/com/didispace/chapter64/UserInfo.java‎

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package com.didispace.chapter64;
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import lombok.Data;
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import lombok.NoArgsConstructor;
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import javax.persistence.Entity;
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import javax.persistence.GeneratedValue;
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import javax.persistence.Id;
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@Entity
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@Data
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@NoArgsConstructor
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public class UserInfo {
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@Id
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@GeneratedValue
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private Long id;
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private String name;
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private Integer age;
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public UserInfo(String name, Integer age) {
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this.name = name;
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this.age = age;
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}
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}

‎2.x/chapter6-4/src/main/java/com/didispace/chapter64/UserInfoRepository.java‎

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package com.didispace.chapter64;
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import org.springframework.data.jpa.repository.JpaRepository;
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import org.springframework.data.jpa.repository.Query;
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import org.springframework.data.repository.query.Param;
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/**
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* Created by 程序猿DD/翟永超 on 2021/10/08.
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* <p>
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* Blog: http://blog.didispace.com/
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* Github: https://github.com/dyc87112/
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*/
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public interface UserInfoRepository extends JpaRepository<UserInfo, Long> {
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UserInfo findByName(String name);
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UserInfo findByNameAndAge(String name, Integer age);
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@Query("from UserInfo u where u.name=:name")
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UserInfo findUser(@Param("name") String name);
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}

‎2.x/chapter6-4/src/main/resources/application.properties‎

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spring.datasource.url=jdbc:postgresql://localhost:5432/test
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spring.datasource.username=postgres
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spring.datasource.password=123456
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spring.datasource.driver-class-name=org.postgresql.Driver
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spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
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spring.jpa.properties.hibernate.hbm2ddl.auto=create

‎2.x/chapter6-4/src/test/java/com/didispace/chapter64/ApplicationTests.java‎

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package com.didispace.chapter64;
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import lombok.extern.slf4j.Slf4j;
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import org.junit.jupiter.api.Assertions;
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import org.junit.jupiter.api.Test;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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@Slf4j
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@SpringBootTest
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public class ApplicationTests {
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@Autowired
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private UserInfoRepository userRepository;
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@Test
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public void test() throws Exception {
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// 创建10条记录
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userRepository.save(new UserInfo("AAA", 10));
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userRepository.save(new UserInfo("BBB", 20));
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userRepository.save(new UserInfo("CCC", 30));
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userRepository.save(new UserInfo("DDD", 40));
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userRepository.save(new UserInfo("EEE", 50));
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userRepository.save(new UserInfo("FFF", 60));
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userRepository.save(new UserInfo("GGG", 70));
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userRepository.save(new UserInfo("HHH", 80));
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userRepository.save(new UserInfo("III", 90));
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userRepository.save(new UserInfo("JJJ", 100));
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// 测试findAll, 查询所有记录
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Assertions.assertEquals(10, userRepository.findAll().size());
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// 测试findByName, 查询姓名为FFF的User
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Assertions.assertEquals(60, userRepository.findByName("FFF").getAge().longValue());
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// 测试findUser, 查询姓名为FFF的User
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Assertions.assertEquals(60, userRepository.findUser("FFF").getAge().longValue());
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// 测试findByNameAndAge, 查询姓名为FFF并且年龄为60的User
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Assertions.assertEquals("FFF", userRepository.findByNameAndAge("FFF", 60).getName());
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// 测试删除姓名为AAA的User
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userRepository.delete(userRepository.findByName("AAA"));
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// 测试findAll, 查询所有记录, 验证上面的删除是否成功
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Assertions.assertEquals(9, userRepository.findAll().size());
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}
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}

‎2.x/pom.xml‎

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<module>chapter5-5</module> <!-- 使用Redis的发布订阅-->
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<!-- 5-6 Redis + EhCache的二连组合拳 -->
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<!-- 非关系型的数据储存的使用 -->
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<!-- 其他常见数据储存的使用 -->
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<module>chapter6-1</module> <!-- 6-1 使用MongoDB -->
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<module>chapter6-2</module> <!-- 6-2 使用轻量级树状存储 LDAP -->
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<module>chapter6-3</module> <!-- 6-3 使用时序数据库 InfluxDB -->
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<!-- 6-4 使用Elasticsearch -->
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<module>chapter6-4</module> <!-- 6-4 使用PostgreSQL数据库 -->
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<!-- 6-5 使用Elasticsearch -->
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<!-- 任务管理 -->
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<module>chapter7-1</module> <!-- 7-1 使用@Scheduled实现定时任务 -->

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