SpringBoot2 MyBatis集成Apache Camel路由与集成

在Spring Boot 2中集成MyBatis和Apache Camel路由是一个相对复杂的过程，但通过以下步骤，你可以成功实现这一集成。

1. 添加依赖

首先，在你的pom.xml文件中添加必要的依赖项。

MyBatis依赖

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.4</version>
</dependency>

Apache Camel依赖

<dependency>
    <groupId>org.apache.camel.springboot</groupId>
    <artifactId>camel-spring-boot-starter</artifactId>
    <version>3.14.0</version>
</dependency>

2. 配置MyBatis

创建一个MyBatis配置类来配置数据源和Mapper接口。

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import javax.sql.DataSource;

@Configuration
@MapperScan("com.example.demo.mapper")
public class MyBatisConfig {

    @Bean
    public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {
        SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource);
        sessionFactory.setTypeAliasesPackage("com.example.demo.entity");
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/*.xml"));
        return sessionFactory.getObject();
    }
}

3. 配置Apache Camel

创建一个Camel配置类来定义路由和组件。

import org.apache.camel.builder.RouteBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class CamelConfig {

    @Bean
    public RouteBuilder routeBuilder() {
        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                from("direct:start")
                        .to("mybatis:selectUserById?mapper=com.example.demo.mapper.UserMapper");
            }
        };
    }
}

4. 创建Mapper接口和XML文件

创建一个Mapper接口和对应的XML文件来定义SQL查询。

UserMapper接口

package com.example.demo.mapper;

import com.example.demo.entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

import java.util.List;

@Mapper
public interface UserMapper {
    @Select("SELECT * FROM users WHERE id = #{id}")
    User selectUserById(Long id);
}

UserMapper.xml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="com.example.demo.mapper.UserMapper">
    <select id="selectUserById" resultType="com.example.demo.entity.User">
        SELECT * FROM users WHERE id = #{id}
    </select>
</mapper>

5. 测试集成

创建一个简单的Spring Boot应用程序来测试MyBatis和Apache Camel的集成。

package com.example.demo;

import org.apache.camel.CamelContext;
import org.apache.camel.ProducerTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication implements CommandLineRunner {

    @Autowired
    private ProducerTemplate producerTemplate;

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

    @Override
    public void run(String... args) throws Exception {
        User user = new User();
        user.setId(1L);
        producerTemplate.sendBody("direct:start", user);
    }
}

6. 运行应用程序

启动你的Spring Boot应用程序，然后通过Camel路由发送一个请求到direct:start端点。你应该能够看到MyBatis从数据库中查询数据并返回结果。

通过以上步骤，你已经成功地在Spring Boot 2中集成了MyBatis和Apache Camel路由。