十四、SpringBoot之数据访问整合MyBatis

pom.xml

        <!--引入mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!-- 引入druid数据源-->
        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>

application.yml(配置数据源相关属性)

spring:
  datasource:
    #数据源基本配置
    username: root
    password: 123456
    url: jdbc:mysql://172.16.40.146:3306/mybatis
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
    #数据源其他配置
    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
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
#注解版
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

DruidConfig(配置数据源相关属性)

@Configuration
public class DruidConfig {
    //绑定配置文件里的spring.datasource.xxx
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druid(){
        return  new DruidDataSource();
    }

    //配置Druid的监控
    //1、配置一个管理后台的Servlet
    @Bean
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
        Map<String,String> initParams = new HashMap<>();
        initParams.put("loginUsername","admin");
        initParams.put("loginPassword","123456");
        initParams.put("allow","");//默认就是允许所有访问
        initParams.put("deny","192.168.15.21");//拒绝谁访问
        bean.setInitParameters(initParams);
        return bean;
    }


    //2、配置一个web监控的filter
    @Bean
    public FilterRegistrationBean webStatFilter(){
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new WebStatFilter());
        Map<String,String> initParams = new HashMap<>();
        //设置初始化参数
        initParams.put("exclusions","*.js,*.css,/druid/*");
        bean.setInitParameters(initParams);
        //设置拦截请求
        bean.setUrlPatterns(Arrays.asList("/*"));
        return  bean;
    }
}

JavaBean(创建JavaBean)

public class Department {
    private Integer id;
    private String departmentName;

public class Employee {
    private Integer id;
    private String lastName;
    private Integer gender;
    private String email;
    private Integer dId;

Controller

@RestController
public class DeptController {
    @Autowired
    DepartmentMapper departmentMapper;
    @Autowired
    EmployeeMapper employeeMapper;
    @GetMapping("/dept/{id}")
    public Department getDepartment(@PathVariable("id") Integer id){
        return departmentMapper.getDeptById(id);
    }
    @GetMapping("/dept")
    public Department insertDept(Department department){
        departmentMapper.insertDept(department);
        return department;
    }
    @GetMapping("/emp/{id}")
    public Employee getEmp(@PathVariable("id") Integer id){
       return employeeMapper.getEmpById(id);
    }
}

Mapper

//1.注解版
//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(department_name) values(#{departmentName})")
    public int insertDept(Department department);
    @Update("update department set department_name=#{departmentName} where id=#{id}")
    public int updateDept(Department department);
}

2.配置版
//@Mapper或者@MapperScan将接口扫描装配到容器中
//@Mapper
public interface EmployeeMapper {
    public Employee getEmpById(Integer id);
    public void insertEmp(Employee employee);
}

//使用MapperScan批量扫描所有的Mapper接口；
@MapperScan(value = "com.atguigu.springboot.mapper")
@SpringBootApplication
public class SpringBootMybatisApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringBootMybatisApplication.class, args);
    }
}

<!--配置版-->
<?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.atguigu.springboot.mapper.EmployeeMapper">
    <select id="getEmpById" resultType="com.atguigu.springboot.bean.Employee">
        SELECT * FROM employee WHERE id=#{id}
    </select>

    <insert id="insertEmp">
        INSERT INTO employee(lastName,email,gender,d_id) VALUES (#{lastName},#{email},#{gender},#{dId})
    </insert>
</mapper>

MybatisConfig

//注解版
//自定义MyBatis的配置规则；给容器中添加一个ConfigurationCustomizer；
@org.springframework.context.annotation.Configuration
public class MyBatisConfig {

    @Bean
    public ConfigurationCustomizer configurationCustomizer(){
        return new ConfigurationCustomizer(){
            @Override
            public void customize(Configuration configuration) {
                //配置驼峰命名法
                configuration.setMapUnderscoreToCamelCase(true);
            }
        };
    }
}

配置版mybatis-config.xml
<?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>
    <!--配置驼峰命名法-->
    <setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
</configuration>

mybatis操作文档

十四、SpringBoot之数据访问整合MyBatis

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