• Spring Boot 系列教程2-Data JPA

    Spring Data JPA

    用来简化创建 JPA 数据访问层和跨存储的持久层功能。

    官网文档连接

    http://docs.spring.io/spring-data/jpa/docs/current/reference/html/

    Spring Data JPA提供的接口

    • Repository：最顶层的接口，是一个空的接口，目的是为了统一所有Repository的类型，且能让组件扫描的时候自动识别
    • CrudRepository ：是Repository的子接口，提供CRUD的功能
    • PagingAndSortingRepository：是CrudRepository的子接口，添加分页和排序的功能
    • JpaRepository：是PagingAndSortingRepository的子接口，增加了一些实用的功能，比如：批量操作等
    • JpaSpecificationExecutor：用来做负责查询的接口
    • Specification：是Spring Data JPA提供的一个查询规范，要做复杂的查询，只需围绕这个规范来设置查询条件即可
      这里写图片描述

    项目图片

    这里写图片描述

    pom.xml

    -只需要在pom.xml引入需要的数据库配置，就会自动访问此数据库，如果需要配置其他数据库，可以在application.properties进行添加
    -默认使用org.apache.tomcat.jdbc.pool.DataSource创建连接池

    <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.jege.spring.boot</groupId>
    <artifactId>spring-boot-data-jpa</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-boot-data-jpa</name>
    <url>http://maven.apache.org</url>

    <!-- 公共spring-boot配置，下面依赖jar文件不用在写版本号 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.1.RELEASE</version>
        <relativePath />
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>

        <!-- 持久层 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <!-- h2内存数据库 -->
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <finalName>spring-boot-data-jpa</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

    User.java

    package com.jege.spring.boot.data.jpa.entity;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

/**
 * @author JE哥
 * @email 1272434821@qq.com
 * @description:jpa模型对象
 */
@Entity
@Table(name = "t_user")
public class User {
  @Id
  @GeneratedValue
  private Long id;
  private String name;
  private Integer age;

  public User() {

  }

  public User(String name, Integer age) {
    this.name = name;
    this.age = age;
  }

  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 getAge() {
    return age;
  }

  public void setAge(Integer age) {
    this.age = age;
  }

}

    UserRepository.java

    package com.jege.spring.boot.data.jpa.repository;

import java.util.List;

import org.springframework.data.jpa.repository.JpaRepository;

import com.jege.spring.boot.data.jpa.entity.User;

/**
 * @author JE哥
 * @email 1272434821@qq.com
 * @description:持久层接口，由spring自动生成其实现
 */
public interface UserRepository extends JpaRepository<User, Long> {

  List<User> findByNameLike(String name);

}

    Repository接口查询规则

    关键字 案例 效果
    And findByLastnameAndFirstname … where x.lastname = ?1 and x.firstname = ?2
    Or findByLastnameOrFirstname … where x.lastname = ?1 or x.firstname = ?2
    Is,Equals findByFirstname,findByFirstnameIs,findByFirstnameEquals … where x.firstname = ?1
    Between findByStartDateBetween … where x.startDate between ?1 and ?2
    LessThan findByAgeLessThan … where x.age < ?1
    LessThanEqual findByAgeLessThanEqual … where x.age <= ?1
    GreaterThan findByAgeGreaterThan … where x.age > ?1
    GreaterThanEqual findByAgeGreaterThanEqual … where x.age >= ?1
    After findByStartDateAfter … where x.startDate > ?1
    Before findByStartDateBefore … where x.startDate < ?1
    IsNull findByAgeIsNull … where x.age is null
    IsNotNull,NotNull findByAge(Is)NotNull … where x.age not null
    Like findByFirstnameLike … where x.firstname like ?1
    NotLike findByFirstnameNotLike … where x.firstname not like ?1
    StartingWith findByFirstnameStartingWith … where x.firstname like ?1 (parameter bound with appended %)
    EndingWith findByFirstnameEndingWith … where x.firstname like ?1 (parameter bound with prepended %)
    Containing findByFirstnameContaining … where x.firstname like ?1 (parameter bound wrapped in %)
    OrderBy findByAgeOrderByLastnameDesc … where x.age = ?1 order by x.lastname desc
    Not findByLastnameNot … where x.lastname <> ?1
    In findByAgeIn(Collection ages) … where x.age in ?1
    NotIn findByAgeNotIn(Collection age) … where x.age not in ?1
    TRUE findByActiveTrue() … where x.active = true
    FALSE findByActiveFalse() … where x.active = false
    IgnoreCase findByFirstnameIgnoreCase … where UPPER(x.firstame) = UPPER(?1)

    Application.java

    package com.jege.spring.boot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author JE哥
 * @email 1272434821@qq.com
 * @description:spring boot 启动类
 */

@SpringBootApplication
public class Application {

  public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
  }

}

    application.properties

    ## JPA Settings
spring.jpa.generate-ddl: true
spring.jpa.show-sql: true
spring.jpa.hibernate.ddl-auto: create
spring.jpa.properties.hibernate.format_sql: false

    UserRepositoryTest.java

    package com.jege.spring.boot.data.jpa;

import static org.assertj.core.api.Assertions.assertThat;

import org.junit.After;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.jege.spring.boot.data.jpa.entity.User;
import com.jege.spring.boot.data.jpa.repository.UserRepository;

/**
 * @author JE哥
 * @email 1272434821@qq.com
 * @description:
 */
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest()
public class UserRepositoryTest {
  @Autowired
  UserRepository userRepository;

  // 打印出class com.sun.proxy.$Proxy66表示spring注入通过jdk动态代理获取接口的子类
  @Test
  public void proxy() throws Exception {
    System.out.println(userRepository.getClass());
  }

  @Test
  public void save() throws Exception {
    for (int i = 0; i < 10; i++) {
      User user = new User("jege" + i, 25 + i);
      userRepository.save(user);
    }
  }

  @Test
  public void all() throws Exception {
    save();
    assertThat(userRepository.findAll()).hasSize(10);
  }

  @Test
  public void findByName() throws Exception {
    save();
    assertThat(userRepository.findByNameLike("jege%")).hasSize(10);
  }

  @After
  public void destroy() throws Exception {
    userRepository.deleteAll();
  }

}

    源码地址

    https://github.com/je-ge/spring-boot

    如果觉得我的文章对您有帮助,请予以打赏。您的支持将鼓励我继续创作!谢谢！
    微信打赏
    支付宝打赏
  • 相关阅读:
    Maven项目中Spring整合Mybatis
    java中，方法可以访问他的类对象的任何私有特性
    SpringBoot之整合Mybatis（增，改，删）
    SpringBoot之整合Mybatis
    SpringBoot之简单入门
    puppet-master搭建
    基于weka的文本分类实现
    static关键字用法
    Vmware /CentOS访问Windows中的文件
    异常备忘
  • 原文地址：https://www.cnblogs.com/je-ge/p/6106748.html
Copyright © 2020-2023  润新知