在基于springboot构建的maven工程中使用mybatis框架

1.在pom.xml文件下引用相关依赖包

        <!-- 数据源-->
        <dependency>
            <groupId>com.zaxxer</groupId>
            <artifactId>HikariCP</artifactId>
        </dependency>

        <!-- mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>

        <!-- mybatis-spring -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>

2.在application.properties文件中配置数据库和mybatis的连接
在本实例中使用的是mysql数据库，需要配置数据库名称、地址等相关信息。

#配置数据源
spring.datasource.name=shoesshopping
spring.datasource.url=jdbc:mysql://localhost:3306/shoesshopping
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

#mybatis
mybatis.type-aliases-package=com.lzr.model

3.创建实体，编写mybatis的mapper映射

在创建好数据模型对应的实体类(如下面代码里的Member类)后，使用注解配置SQL语句。

package com.lzr.dao.mapper;

import com.lzr.model.Member;
import org.apache.ibatis.annotations.*;

import java.util.List;

@Mapper
public interface MemberMapper {

    @Insert("INSERT INTO member (name, pwd, userType) VALUES (#{name}, #{pwd}, '1')")
    int save(Member member);

    @Select("SELECT * FROM member WHERE userId = #{userId}")
    Member selectById(int id);

    @Select("SELECT * FROM member WHERE name = #{name}")
    Member selectByName(String name);

    @Update("UPDATE member SET pwd = #{pwd} WHERE userId = #{userId}")
    int updateById(Member member);

    @Delete("DELETE FROM member WHERE userId = #{userId}")
    int deleteById(Member member);

    @Select("SELECT * FROM member")
    List<Member> queryAll();
}

4.在controller层或service层编写逻辑，调用mapper

    @Autowired
    MemberMapper mapper;

    @Override
    public String login(String name) {
        if(StringUtils.isEmpty(mapper.selectByName(name))){
            return "index";
        }else {
            return "success";
        }

    }

运行程序，就可以成功连接数据库，对数据进行操作。