整合MyBatis

官方文件：http://mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/

Maven倉庫地址：https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter/2.1.1

整合測試

 1、匯入 MyBatis 所需要的依賴

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

2、配置資料庫連線資訊

spring:
  datasource:
    username: root
    password: 123456
    #?serverTimezone=UTC解決時區的報錯
    url: jdbc:mysql://localhost:3306/springboot?serverTimezone=UTC&useUnicode=true&characterEncoding
 
=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource

    #Spring Boot 預設是不注入這些屬性值的，需要自己繫結
    #druid 資料來源專有配置
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true

    #配置監控統計攔截的filters，stat:監控統計、log4j：日誌記錄、wall：防禦sql注入
    #如果允許時報錯  java.lang.ClassNotFoundException: org.apache.log4j.Priority
    #則匯入 log4j 依賴即可，Maven 地址：https://mvnrepository.com/artifact/log4j/log4j
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
 

3、建立mapper目錄以及對應的 Mapper 介面

DepartmentMapper.java

//@Mapper : 表示本類是一個 MyBatis 的 Mapper
@Mapper
@Repository
public interface DepartmentMapper {

    // 獲取所有部門資訊
    List<Department> getDepartments();

    // 通過id獲得部門
    Department getDepartment(Integer id);

}

4、對應的Mapper對映檔案

DepartmentMapper.xml

<?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.kuang.mapper.DepartmentMapper">

    <select id="getDepartments" resultType="Department">
       select * from department;
    </select>

    <select id="getDepartment" resultType="Department" parameterType="int">
       select * from department where id = #{id};
    </select>

</mapper>

5、maven配置資源過濾問題

<resources>
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.xml</include>
        </includes>
        <filtering>true</filtering>
    </resource>
</resources>

6、配置檔案中新增實體類別名包掃描以及xml檔案掃描

mybatis.type-aliases-package=com.david.pojo
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

7、編寫部門的 DepartmentController 進行測試！

@RestController
public class DepartmentController {
    
    @Autowired
    DepartmentMapper departmentMapper;
    
    // 查詢全部部門
    @GetMapping("/getDepartments")
    public List<Department> getDepartments(){
        return departmentMapper.getDepartments();
    }

    // 查詢全部部門
    @GetMapping("/getDepartment/{id}")
    public Department getDepartment(@PathVariable("id") Integer id){
        return departmentMapper.getDepartment(id);
    }
    
}