SpringBoot JPA使用配置过程详解

jpa是什么? jpa(java persistence api)是sun官方提出的java持久化规范. 为java开发人员提供了一种对象/关联映射工具来管理java应用中的关系数据. 它的出现是为了简化现有的持久化开发工作和整合orm技术. 结束各个orm框架各自为营的局面.
jpa 其实是一种规范，它的实现中比较出名的是 hibernate 框架；

1、pom 引入依赖：

<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>
      <scope>runtime</scope>
      <version>5.1.18</version>
    </dependency>
    <dependency>
      <groupid>com.alibaba</groupid>
      <artifactid>druid-spring-boot-starter</artifactid>
      <version>1.1.10</version>
    </dependency>

2、添加配置文件

#数据库连接信息
spring.datasource.type=com.alibaba.druid.pool.druiddatasource
spring.datasource.username=root
spring.datasource.password=521hui
spring.datasource.url=jdbc:mysql://localhost:3306/test
#jpa设置
spring.jpa.show-sql=true
spring.jpa.database=mysql
spring.jpa.database-platform=mysql
spring.jpa.hibernate.ddl-auto=update
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.mysql57dialect

3、编写 bean

@entity(name = "t_book")
public class book {
  @id
  @generatedvalue(strategy = generationtype.identity)
  private integer id;
  private string name;
  private string author;

  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 getauthor() {
    return author;
  }

  public void setauthor(string author) {
    this.author = author;
  }

  @override
  public string tostring() {
    return "book{" +
        "id=" + id +
        ", name='" + name + '\'' +
        ", author='" + author + '\'' +
        '}';
  }
}

4、编写 接口

public interface bookdao extends jparepository<book,integer> {
}

5、启动程序，数据库创建表

6、进行 crud 测试

@autowired
  bookdao bookdao;
  @test
  void testinsert() {
    book book = new book();
    book.setname("孔雀翎");
    book.setauthor("古龙");

    bookdao.save(book);
  }
  @test
  void testupdate() {
    book book = new book();
    book.setname("笑傲江湖");
    book.setauthor("金庸");
    book.setid(1);
    bookdao.saveandflush(book);
  }
  @test
  void testdelete() {
    bookdao.deletebyid(1);
  }

  @test
  void testfind() {
    system.out.println(bookdao.findbyid(4).tostring());
  }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。