SpringBoot 整合 MyBatis

使用mapper SQL映射文件和注解的方式

非注解版

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.garcon</groupId>
    <artifactId>hello-spring-boot-mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>hello-spring-boot-mybatis</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <mysql.version>5.1.38</mysql.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.0</version>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.12</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.18</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.8</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

application.yml配置文件

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test
    username: root
    password: garcon
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
    druid: #数据源
      initial-size: 8
      min-idle: 1
      max-active: 20
      max-wait: 60000
      time-between-eviction-runsMillis: 60000
      min-evictable-idle-timeMillis: 300000
      validation-query: select 'x' FROM DUAL
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
      pool-prepared-statements: true
      max-open-prepared-statements: 20
      max-pool-prepared-statement-per-connection-size: 20
      filters: stat
      connection-properties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
      use-global-data-source-stat: true

mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.garcon.hellospringbootmybatis.domain

配置Druid的监控

@Configuration
public class DruidConfig {

    @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");

        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<>();
        initParams.put("exclusions","*.js,*.css,/druid/*");

        bean.setInitParameters(initParams);

        bean.setUrlPatterns(Arrays.asList("/*"));

        return  bean;
    }
}

SpringBoot的启动类上需要扫描mapper接口所在的包

@MapperScan("com.garcon.hellospringbootmybatis.mapper")
@SpringBootApplication
public class HelloSpringBootMybatisApplication {

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

mapper接口上可以不使用@Mapper注解

public interface UserMapper {

    int insert(User user);
}

mapper配置文件

<?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.garcon.hellospringbootmybatis.mapper.UserMapper">
    <insert id="insert">
        insert into `user` values(#{id},#{username},#{password},#{email})
    </insert>
</mapper>

注解版

注解版的application.yml中不需要扫描实体类和mapper配置文件 , 去除以下配置

mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.garcon.hellospringbootmybatis.domain

只需要一个Mapper接口

public interface UserMapper {

    @Insert("insert into user values(#{id},#{username},#{password},#{email})")
    int insert(User user);
}