springboot整合mybatis非常非常的简单,简直简单到发指。但是也有一些坑,这里我会详细的指出会遇到什么问题,并且这些配置的作用
整合mybatis,无疑需要mapper文件,实体类,dao层,数据库连接池。。。。。也就没了。
先放配置application.yml
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spring: datasource: type: com.alibaba.druid.pool.DruidDataSource driver-class-name: com.mysql.jdbc.Driver filters: stat maxActive: 20 initialSize: 1 maxWait: 60000 minIdle: 1 timeBetweenEvictionRunsMillis: 60000 minEvictableIdleTimeMillis: 300000 validationQuery: select 'x' testWhileIdle: true testOnBorrow: false testOnReturn: false poolPreparedStatements: true maxOpenPreparedStatements: 20 name: test url: jdbc:mysql://localhost:3306/mama-bike?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull username: root password: root mybatis: #告诉spring你的mapper的位置。 mapper-locations: classpath:com/coder520/mamabike/**/**.xml #告诉spring你的实体类的位置 type-aliases-package: classpath:com.coder520.mamabike.**.entity logging: config: classpath:logback.xml
dao层接口 //就简单的写一个方法
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public interface UserMapper { int insert(User record); }
mapper
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<?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.coder520.mamabike.user.dao.UserMapper" > <resultMap id="BaseResultMap" type="com.coder520.mamabike.user.entity.User" > <id column="id" property="id" jdbcType="BIGINT" /> <result column="nickname" property="nickname" jdbcType="VARCHAR" /> <result column="enable_flag" property="enableFlag" jdbcType="TINYINT" /> <result column="verify_flag" property="verifyFlag" jdbcType="TINYINT" /> <result column="head_img" property="headImg" jdbcType="VARCHAR" /> <result column="mobile" property="mobile" jdbcType="VARCHAR" /> </resultMap> <sql id="Base_Column_List" > id, nickname, enable_flag, verify_flag, head_img, mobile </sql> <insert id="insert" parameterType="com.coder520.mamabike.user.entity.User" > insert into user (id, nickname, enable_flag, verify_flag, head_img, mobile ) values (#{id,jdbcType=BIGINT}, #{nickname,jdbcType=VARCHAR}, #{enableFlag,jdbcType=TINYINT}, #{verifyFlag,jdbcType=TINYINT}, #{headImg,jdbcType=VARCHAR}, #{mobile,jdbcType=VARCHAR} ) </insert> </mapper>
main方法
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@SpringBootApplication @ComponentScan(basePackages={"com.coder520.mamabike"}) @MapperScan(basePackages="com.demo.user.mapper") public class MamaBikeApplication { public static void main(String[] args) { SpringApplication.run(MamaBikeApplication.class, args); } }
需要注意的是,dao层接口spring怎么会知道呢?这里就需要@MapperScan(basePackages="com.demo.user.mapper") 这个注解来指定mapper接口的位置。用@ComponentScan(basePackages={"com.coder520.mamabike"})这个注解来让spring扫描我们指定包下的注解。
如果我们不用@MapperScan这个注解的话,也可以在接口类的上方加上@Mapper这个注解也可以。