SpringBoot中使用Mybatis

pom依赖

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
    </parent>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--数据库连接池-->
        <dependency>
            <groupId>com.zaxxer</groupId>
            <artifactId>HikariCP</artifactId>
        </dependency>
        <!--测试依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

springBoot启动类配置

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author springBoot启动类
 */
@SpringBootApplication
@MapperScan("cn.bufanli.mybatis.mapper") //扫描mapper接口位置
public class MybatisApplication {
     public static void main(String[] args) {
          SpringApplication.run(MybatisApplication.class,args);
     }
}

数据源配置类

import com.zaxxer.hikari.HikariDataSource;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

/**
 * @author 配置类
 */
@Configuration
@EnableConfigurationProperties(JdbcProperties.class)
public class JdbcConfig {

     @Bean
     public DataSource getDataSource(JdbcProperties jdbc){
          HikariDataSource dataSource = new HikariDataSource();
          dataSource.setJdbcUrl(jdbc.getUrl());
          dataSource.setDriverClassName(jdbc.getDriverClassName());
          dataSource.setUsername(jdbc.getUsername());
          dataSource.setPassword(jdbc.getPassword());
          return dataSource;
     }
}

/**
 * @author 这是一个jdbc配置类
 * prefix yml 里面的前缀 他会自动寻找位置并且赋值
 */
@ConfigurationProperties(prefix = "jdbc") 
public class JdbcProperties {
     private  String url;
     private String driverClassName;
     private String username;
     private String password;

     public String getUrl() {
          return url;
     }

     public void setUrl(String url) {
          this.url = url;
     }

     public String getDriverClassName() {
          return driverClassName;
     }

     public void setDriverClassName(String driverClassName) {
          this.driverClassName = driverClassName;
     }

     public String getUsername() {
          return username;
     }

     public void setUsername(String username) {
          this.username = username;
     }

     public String getPassword() {
          return password;
     }

     public void setPassword(String password) {
          this.password = password;
     }
}

mapper接口类

import cn.bufanli.mybatis.pojo.Order;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper  // mybatis组件注解
public interface MybatisMapper {
     /**
      * 查询订单详情方法
      * @return
      */
    // @Select("select * from order")
     List<Order> getOrderList();
}

配置yml文件

server:
  port: 8089  # 服务端口号
spring:
  application:
    name: mybatis-service  # 服务名称
jdbc:  # 数据源链接信息
  driverClassName: com.mysql.jdbc.Driver
  url: jdbc:mysql://127.0.0.1:3306/estore
  username: root
  password: mypassword
mybatis:
  type-aliases-package: cn.bufanli.mybatis.pojo # 别名扫描宝
  mapper-locations: classpath:mappers/*.xml # 映射文件的路径扫描

xxxmapper.xml映射文件

<?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="cn.bufanli.mybatis.mapper.MybatisMapper">
    <select id="getOrderList" resultType="order">
    select  * from  orders
    </select>
</mapper>

整体结构