mybatis基础框架搭建

前言：基于springboot，使用mysql数据库，druid连接池

1. 引入依赖

   <dependency>
           <groupId>org.mybatis.spring.boot</groupId>
           <artifactId>mybatis-spring-boot-starter</artifactId>
           <version>2.1.2</version>
   </dependency>
   
   <dependency>
           <groupId>mysql</groupId>
           <artifactId>mysql-connector-java</artifactId>
           <scope>runtime</scope>
   </dependency>
   
   <dependency>
           <groupId>com.alibaba</groupId>
           <artifactId>druid-spring-boot-starter</artifactId>
           <version>1.1.14</version>
   </dependency>
   

2. 配置application.yml

   spring:
     datasource:
       driver-class-name: com.mysql.cj.jdbc.Driver
       url: jdbc:mysql://localhost:3306/easy_mybatis? serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
       username: root
       password: ccc+022599
       type: com.alibaba.druid.pool.DruidDataSource
   mybatis:
     type-aliases-package: cn.ccb.pojo
     mapper-locations: classpath:mapper/*.xml
   

3. 编写实体类、mapper接口、mapper映射文件

mapper接口

@Repository
@Mapper
public interface UserMapper {
    public User queryUserByName(String name);
}

实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User implements Serializable {

    private String username;
    private String password;
}

mapper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.ccb.mapper.UserMapper">
    <select id="queryUserByName" resultType="user" parameterType="string">
        select * from userinfo where username=#{name}
    </select>
</mapper>