5springcloud整合mybatis注解方式

Posted 2022-01-15 happyhuangjinjin

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1、上一篇学习了服务提供者provider，但是并不是单单就学习了服务提供者。中间还穿插使用了Hikari数据源和spring cloud整合mybatis。但是上篇使用mybatis时还是沿用了老的方式，需要配置mapper对应的xml文件。先来看看上篇使用mybatis的主要步骤

一、 pom.xml文件引用

<groupId>org.mybatis</groupId>

<artifactId>mybatis-spring</artifactId>

</dependency>

<groupId>org.mybatis.spring.boot</groupId>

<artifactId>mybatis-spring-boot-starter</artifactId>

</dependency>

二、application.yml配置文件加入mybtias配置项

mybatis:

mapperLocations: classpath:sc/provider/dao/*.xml

#configLocation: classpath:mybatis-config.xml

三、编写mapper文件user-mapper.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" >

select id, userName, age, position from t_user where id = #id,jdbcType=INTEGER

</select>

select id, userName, age, position from t_user

</select>

insert into t_user (

id, userName, age, position

) values (

#id,jdbcType=INTEGER,

#userName,jdbcType=VARCHAR,

#age,jdbcType=INTEGER,

#position,jdbcType=VARCHAR

)

</insert>

update t_user set

userName = #userName,jdbcType=VARCHAR,

age = #age,jdbcType=INTEGER,

position = #position,jdbcType=VARCHAR

where id = #id,jdbcType=INTEGER

</update>

delete from t_user

where id = #id,jdbcType=INTEGER

</delete>

</mapper>

四、编写UserDao.java

package sc.provider.dao;

import java.util.List;

import sc.provider.model.User;

public interface UserDao

User getUser(Long id);

List<User> listUser();

int addUser(User user);

int updateUser(User user);

int deleteUser(Long id);

五、在ProviderApplication.java添加@MapperScan(basePackages="sc.provider.dao")

经过上面五个步骤才能使用mybatis。本篇将和大家看看不能简化spring cloud 整合mybatis的步骤（在sc-eureka-client-provider工程上改造）

一、依赖必不可少

<groupId>org.mybatis</groupId>

<artifactId>mybatis-spring</artifactId>

</dependency>

<groupId>org.mybatis.spring.boot</groupId>

<artifactId>mybatis-spring-boot-starter</artifactId>

</dependency>

二、删除application.yml关于mybatis的配置

三、删除mapper文件user-mapper.xml文件

四、改造UserDao.java类

package sc.provider.dao;

import java.util.List;

import org.apache.ibatis.annotations.Delete;

import org.apache.ibatis.annotations.Insert;

import org.apache.ibatis.annotations.Mapper;

import org.apache.ibatis.annotations.Select;

import org.apache.ibatis.annotations.Update;

import sc.provider.model.User;

@Mapper

public interface UserDao

@Select(value="select id, userName, age, position from t_user where id = #id,jdbcType=INTEGER")

User getUser(Long id);

@Select(value="select id, userName, age, position from t_user")

List<User> listUser();

@Insert(value="insert into t_user (id, userName, age, position) values ( #id,jdbcType=INTEGER,#userName,jdbcType=VARCHAR,#age,jdbcType=INTEGER,#position,jdbcType=VARCHAR)")

int addUser(User user);

@Update(value="update t_user set userName = #userName,jdbcType=VARCHAR,age = #age,jdbcType=INTEGER,position = #position,jdbcType=VARCHAR where id = #id,jdbcType=INTEGER")

int updateUser(User user);

@Delete(value=" delete from t_user where id = #id,jdbcType=INTEGER")

int deleteUser(Long id);

五、 @MapperScan注解必不可少

package sc.provider;

import org.mybatis.spring.annotation.MapperScan;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication

@EnableEurekaClient

@MapperScan(basePackages="sc.provider.dao")