springboot-jpa|hibernate|springdata

Dear 丶 2022-05-14 15:46 210阅读 0赞

# 一、Concept #

**JPA** java persistence API  
通过5.0的注解或者xml描述对象到关系表的映射关系,并将运行期的实体对象持久化到数据库中  
**Hibernate**  
jpa是一种规范,hibernate是它的实现  
对jdbc轻量级封装,将pojo与数据库表建立映射关系,全自动orm框架  
**springData**  
简化对数据库访问,支持云服务的开源框架  
**springDataJpa**  
是springData的一个模块, 简化jpa的写法,除了curd外,还有分页、排序功能,只需要实现一个接口就可以curd操作

# 二、springboot+jpa #

### 1.add pom dependencies ###

<dependency>
    		<groupId>mysql</groupId>
    		<artifactId>mysql-connector-java</artifactId>
    	</dependency>
    	
    	<dependency>
    	    <groupId>org.springframework.boot</groupId>
    	    <artifactId>spring-boot-starter-data-jpa</artifactId>
    	</dependency>

### 2.Add database configuration information in application.properties ###

########################################################
    ###datasource config
    ########################################################
    spring.datasource.url = jdbc:mysql://localhost:3306/test
    spring.datasource.username = root
    spring.datasource.password = root
    spring.datasource.driverClassName = com.mysql.jdbc.Driver
    spring.datasource.max-active=20
    spring.datasource.max-idle=8
    spring.datasource.min-idle=8
    spring.datasource.initial-size=10
    
    
    ########################################################
    ### Java Persistence Api -- Spring jpa config
    ########################################################
    # Specify the DBMS
    spring.jpa.database = MYSQL
    # Show or not log for each sql query
    spring.jpa.show-sql = true
    # Hibernate ddl auto (create, create-drop, update)
    spring.jpa.hibernate.ddl-auto = update
    # Naming strategy
    #[org.hibernate.cfg.ImprovedNamingStrategy #org.hibernate.cfg.DefaultNamingStrategy]
    spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
    # stripped before adding them to the entity manager)
    spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

### 3.Entity class ###

@Entity//标注实体类
    @Id//主键
    @GeneratedValue(Strategy=GenerationType.AUTO)//主键生成策略

### 4.Reponsitory interface ###

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![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzYyNjc3_size_27_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzYyNjc3_size_27_color_FFFFFF_t_70 2]

//最顶层空接口Reponstory
    public interface XxxReponsitory extends CurdReponsitory<Xxx,Integer>{ 
    	//已经继承了curd接口的所有方法
    
    	//可以两种方法自定义查询
    	//1.查询方法以find,get,read开头
    	public Xxx findByXxxName(String xxxName);
    	//2.JPQL语句 类似hql
    	@Query("from Xxx where xxxName = :na);
    	public Xxx findByXxxName2(@Params("na" String xxxName);
    }

in service

@Autowired
    private XxxReponsitory xxxReponsitory;
    
    @Transaction//进行事务绑定
    
    xxxReponsitory.save(Xxx);
    xxxReponsitory.delete(1)
    List<Xxx> list = xxxReponsitory.findAll();

# 三、springboot + jdbcTemplate #

### 1.add pom dependencies ###

<dependency>
    		<groupId>mysql</groupId>
    		<artifactId>mysql-connector-java</artifactId>
    	</dependency>
    	
    	
    	<dependency>
    	    <groupId>org.springframework.boot</groupId>
    	    <artifactId>spring-boot-starter-data-jdbc</artifactId>
    	</dependency>

### 2.Method of use ###

@Reponsitory
    public class DemoDao{ 
    	@Resource
    	private JdbcTemplate jdbcTemplate;
    	
    	public Demo getById(long id){ 
    		String sql = "select * from Demo where id=?";
    		RowMapper<Demo> rowMapper = new BeanPropertyRowMapper<Demo>(Demo.class);
    		return jdbcTemplate.queryForObject(sql,rowMapper);
    	}
    }

--------------------

### springboot+mybatis|自动生成mapper ###

依赖  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzYyNjc3_size_16_color_FFFFFF_t_70][]  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzYyNjc3_size_16_color_FFFFFF_t_70 1][]

自动生成代码generator-详细:[https://www.imooc.com/video/18334][https_www.imooc.com_video_18334]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzYyNjc3_size_27_color_FFFFFF_t_70]: /images/20220503/a8f764f156b040aaa7d8fe298a159ec3.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzYyNjc3_size_27_color_FFFFFF_t_70 1]: /images/20220503/479e0fedb68145d4a4e77ba1d80739cb.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzYyNjc3_size_27_color_FFFFFF_t_70 2]: /images/20220503/3c1d1eae273c49c39274b8d6d80d70ab.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzYyNjc3_size_16_color_FFFFFF_t_70]: /images/20220503/97eb966db523470eba1bba17c6d8134b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzYyNjc3_size_16_color_FFFFFF_t_70 1]: /images/20220503/c8364f72001245acbc55ff0fdfea16c0.png
[https_www.imooc.com_video_18334]: https://www.imooc.com/video/18334

springboot-jpa|hibernate|springdata

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