公众号:java乐园

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

<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis-spring</artifactId>
			<version>1.3.2</version>
		</dependency>

		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.2</version>
		</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" >
<mapper namespace="sc.provider.dao.UserDao" >

	<select id="getUser" parameterType="java.lang.Long"  resultType="sc.provider.model.User">
		select id, userName, age, position from t_user where id = #{id,jdbcType=INTEGER}
	</select>

	<select id="listUser" resultType="sc.provider.model.User">
		select id, userName, age, position from t_user
	</select>

	<insert id="addUser" parameterType="sc.provider.model.User">
		insert into t_user (
			 id, userName, age, position
		) values (
			 #{id,jdbcType=INTEGER},
			 #{userName,jdbcType=VARCHAR},
			 #{age,jdbcType=INTEGER},
			 #{position,jdbcType=VARCHAR}
		)
	</insert>

	<update id="updateUser" parameterType="sc.provider.model.User">
			 update t_user set 
			 userName = #{userName,jdbcType=VARCHAR},
			 age = #{age,jdbcType=INTEGER},
			 position = #{position,jdbcType=VARCHAR}
			 where id = #{id,jdbcType=INTEGER}
	</update>

	<delete id="deleteUser" parameterType="java.lang.Long">
	 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

<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis-spring</artifactId>
			<version>1.3.2</version>
		</dependency>

		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.2</version>
		</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")
public class ProviderApplication {

	public static void main(String[] args) {
		SpringApplication.run(ProviderApplication.class, args);
	}

}

经过以上步骤就把使用xml方式的mybatis改造成使用annotation方式的mybatis了。

2、启动注册中心sc-eureka-server,启动sc-eureka-client-provider-annotation(使用sc-eureka-client-provider项目改造),验证是否改造成功 方式一:

方式二:

圈住的名字是在application.yml配置的

3、使用postman方法相应restful接口,这里就不一一访问了,可以参考上一篇文章的访问方式 添加: http://127.0.0.1:8300/user/addUser 查询: http://127.0.0.1:8300/user/getUser/4 列表: http://127.0.0.1:8300/user/listUser 更新: http://127.0.0.1:8300/user/updateUser 删除: http://127.0.0.1:8300/user/deleteUser/2