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<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.1</version>
</dependency>

步骤:

​ 1)、配置数据源相关属性(见上一节Druid)

​ 2)、给数据库建表

​ 3)、创建JavaBean

4)、注解版

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//指定这是一个操作数据库的mapper
@Mapper
public interface DepartmentMapper {

@Select("select * from department where id=#{id}")
public Department getDeptById(Integer id);

@Delete("delete from department where id=#{id}")
public int deleteDeptById(Integer id);

@Options(useGeneratedKeys = true,keyProperty = "id")
@Insert("insert into department(departmentName) values(#{departmentName})")
public int insertDept(Department department);

@Update("update department set departmentName=#{departmentName} where id=#{id}")
public int updateDept(Department department);
}

问题:

自定义MyBatis的配置规则;给容器中添加一个ConfigurationCustomizer;

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@org.springframework.context.annotation.Configuration
public class MyBatisConfig {

@Bean
public ConfigurationCustomizer configurationCustomizer(){
return new ConfigurationCustomizer(){

@Override
public void customize(Configuration configuration) {
configuration.setMapUnderscoreToCamelCase(true);
}
};
}
}
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使用MapperScan批量扫描所有的Mapper接口;
@MapperScan(value = "com.atguigu.springboot.mapper")
@SpringBootApplication
public class SpringBoot06DataMybatisApplication {

public static void main(String[] args) {
SpringApplication.run(SpringBoot06DataMybatisApplication.class, args);
}
}

5)、配置文件版

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mybatis:
config-location: classpath:mybatis/mybatis-config.xml 指定全局配置文件的位置
mapper-locations: classpath:mybatis/mapper/*.xml 指定sql映射文件的位置

更多使用参照

http://www.mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/

4、整合SpringData JPA

1)、SpringData简介

2)、整合SpringData JPA

JPA:ORM(Object Relational Mapping);

1)、编写一个实体类(bean)和数据表进行映射,并且配置好映射关系;

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//使用JPA注解配置映射关系
@Entity //告诉JPA这是一个实体类(和数据表映射的类)
@Table(name = "tbl_user") //@Table来指定和哪个数据表对应;如果省略默认表名就是user;
public class User {

@Id //这是一个主键
@GeneratedValue(strategy = GenerationType.IDENTITY)//自增主键
private Integer id;

@Column(name = "last_name",length = 50) //这是和数据表对应的一个列
private String lastName;
@Column //省略默认列名就是属性名
private String email;

2)、编写一个Dao接口来操作实体类对应的数据表(Repository)

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//继承JpaRepository来完成对数据库的操作
public interface UserRepository extends JpaRepository<User,Integer> {
}

3)、基本的配置JpaProperties

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spring:  
jpa:
hibernate:
# 更新或者创建数据表结构
ddl-auto: update
# 控制台显示SQL
show-sql: true