Integrate Mybatis

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.2</version>
</dependency>

Steps:

1) . configure data source related properties (see Druid in the previous section)

2) . creating tables for databases

3) , create a JavaBean

4) , annotated version

//Specify that this is a mapper that operates the database
//@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(department_name) values(#{departmentName})")
    public int insertDept(Department department);

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

Question:

Define the configuration rules of Mybatis; add a ConfigurationCustomizer to the container;

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

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

            @Override
            public void customize(Configuration configuration) {
                configuration.setMapUnderscoreToCamelCase(true);
            }
        };
    }
}

//Use MapperScan to scan all Mapper interfaces in batches
@MapperScan(value = "com.eppear.springboot.mapper")
@SpringBootApplication
public class SpringBoot06DataMybatisApplication {

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

5) , profile version

mybatis:
  # Specify global profile location
  config-location: classpath:mybatis/mybatis-config.xml
  # Specify sql mapping file location
  mapper-locations: classpath:mybatis/mapper/*.xml

More references

http://mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/index.html

6.4. Integrating SpringData JPA

6.4.1 introduction to SpringData

6.4.2 integrate SpringData JPA

JPA: ORM ( Object Relational Mapping) ; 1) Write an entity class (bean) and data table for mapping, and configure the mapping relationship;

//Using JPA annotations to configure mapping relationships
@Entity //Tell JPA that this is an entity class (a class mapped to a data table)
@Table(name = "tbl_user") //@Table to specify which data table to correspond to; if the default table name is omitted, it is user;
public class User {

    @Id //This is a primary key
    @GeneratedValue(strategy = GenerationType.IDENTITY)//Self increasing primary key
    private Integer id;

    @Column(name = "last_name",length = 50) //This is a column corresponding to the data table
    private String lastName;
    @Column //Omitting the default column name is the property name
    private String email;

2) Write a Dao interface to operate the data table (Repository) corresponding to the entity class

//Inherit JpaRepository to complete the operation of database
public interface UserRepository extends JpaRepository<User,Integer> {
}

3) . basic configuration

spring:
  datasource:
    url: jdbc:mysql://192.168.15.22/jpa
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
  jpa:
    hibernate:
#     Update or create data table structure
      ddl-auto: update
#   Console display SQL
    show-sql: true