Web应用全栈之旅Spring篇二集成mybatis

一、pom 文件

引入 mybatis

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.0</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

二、yml 配置

添加数据库配置和 mybatis 配置：

database.url=127.0.0.1:3306
spring.datasource.url=jdbc:mysql://${database.url}/demodb?allowMultiQueries=true&useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false
spring.datasource.username=root
spring.datasource.password=admin123

mybatis.mapper-locations=classpath:mapper/*.xml

三、DAO

定义 DAO 接口，添加 @Mapper 注解:

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

import com.javashizhan.demo.mybatis.domain.User;

@Mapper
public interface UserDAO {User findUserByName(@Param(value = "name") String name) throws Exception;

    void createUser(@Param(value = "user") User user) throws Exception;

    int deleteUserByName(@Param(value = "name") String name) throws Exception;
}

四、mybatis 数据库脚本配置文件

脚本配置文件 User.xml：

<?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">
<!-- 命名空间应该是对应接口的包名 + 接口名 -->
<mapper namespace="com.javashizhan.demo.mybatis.dao.UserDAO">
    
    <!-- id 值和 DAO 方法名保持一致，返回类型和 DAO 返回对象一致，字段别名和 User 字段名一致 -->
    <select id="findUserByName" resultType="com.javashizhan.demo.mybatis.domain.User">
        select
          NAME name,
          AGE age,
          GENDER gender
        from USER where name = #{name}
    </select>
    
    <insert id="createUser">
        insert USER(
          NAME,
          AGE,
          GENDER
        ) values(#{user.name},
          #{user.age},
          #{user.gender}
         )
    </insert>
    
    <insert id="deleteUserByName">
        delete from USER where name = #{name}
    </insert>
</mapper>

将此文件放到 resources 目录的子目录 mapper 下，和 yml 配置文件中的路径一致。

五、Service 中调用 DAO

@Service
public class UserService {

    @Autowired
    private UserDAO userDAO;

    public User findUserByName(@Param(value = "name") String name) throws Exception {return userDAO.findUserByName(name);
    }

    public void createUser(@Param(value = "user") User user) throws Exception {userDAO.createUser(user);
    }

    public int deleteUserByName(@Param(value = "name") String name) throws Exception {return userDAO.deleteUserByName(name);
    }
}

以上为 spring 集成 mybatis 的所有步骤，完整实例代码扫码加入微信公众号并回复：<font color=”RED”>webfullstack</font>，获取仓库地址。

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