Spring Boot 數據整合MyBatis

本文章主要記錄Spring Boot 數據整合MyBatis的關鍵步驟

一、整合註解版的Mybatis

1、pom文件引入對應的依賴

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.1</version>
</dependency>

2、指定一個數據庫的mapper，@Options(useGeneratedKeys = true,keyProperty = "id")代表的是表明主鍵，主鍵自增

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);

}

3、編寫配置類

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

    @Bean
    public ConfigurationCustomizer configurationCustomizer(){
        return new ConfigurationCustomizer() {
            @Override
            public void customize(Configuration configuration) {
                configuration.setMapUnderscoreToCamelCase(true);
            }
        };
    }
}

4、編寫對應的Controller來做測試，這裏需要注意當方法傳入的參數爲對象時候，瀏覽器上的URL傳入的參數會自動對應到對象的屬性

例如:http://localhost:8087/dept?departmentName=AA

departmentName爲Department 的屬性

@RestController
public class DeptController {

    @Autowired
    DepartmentMapper departmentMapper;

    @GetMapping("/dept/{id}")
    public Department getDepartment(@PathVariable("id") Integer id){
        Department department = departmentMapper.getDeptById(id);
        return department;
    }

    @GetMapping("/dept")
    public Department insertDepartment(Department department){
        departmentMapper.insertDept(department);
        return department;
    }
}

二、整合配置版MyBatis

1、添加配置文件

mybatis:
  config-location: classpath:mybatis-config.xml
  mapper-locations: classpath:mybatis/mapper/*.xml

mybatis-config.xml配置

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
</configuration>

這裏需要注意mybatis的配置文件mybatis-config.xml不能和mapper文件放在一起

2、建立對應的對象類

public class Employee {

    private Integer id;
    private String lastName;
    private Integer gender;
    private String email;
    private Integer dID;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public Integer getGender() {
        return gender;
    }

    public void setGender(Integer gender) {
        this.gender = gender;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Integer getdID() {
        return dID;
    }

    public void setdID(Integer dID) {
        this.dID = dID;
    }
}

3、新建mapper類

public interface EmployeeMapper {

    public Employee getEmpById(Integer id);

    public void insertEmp(Employee employee);
}

4、編寫mapper.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.springboot.mapper.EmployeeMapper">
    <!--public Employee getEmpById(Integer id);

    public void insertEmp(Employee employee);
    -->
    <select id="getEmpById" resultType="com.example.springboot.bean.Employee">
        SELECT * FROM employee WHERE id=#{id}
    </select>
    
    <insert id="insertEmp">
        INSERT INTO employee(lastName,email,gender,d_id) VALUES (#{lasrName},#{email},#{gender},#{did})
    </insert>
</mapper>

5、編寫Controller測試

@RestController
public class DeptController {

    @Autowired
    EmployeeMapper employeeMapper;

    @GetMapping("/emp/{id}")
    public Employee getEmp(@PathVariable("id") Integer id){
        return employeeMapper.getEmpById(id);
    }
}