SpringBoot2 MyBatis集成Apache Camel路由與集成

在Spring Boot 2中集成MyBatis和Apache Camel路由是一個相對復雜的過程，但通過以下步驟，你可以成功實現這一集成。

1. 添加依賴

首先，在你的pom.xml文件中添加必要的依賴項。

MyBatis依賴

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

Apache Camel依賴

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

2. 配置MyBatis

創建一個MyBatis配置類來配置數據源和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

創建一個Camel配置類來定義路由和組件。

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. 創建Mapper接口和XML文件

創建一個Mapper接口和對應的XML文件來定義SQL查詢。

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. 測試集成

創建一個簡單的Spring Boot應用程序來測試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. 運行應用程序

啟動你的Spring Boot應用程序，然后通過Camel路由發送一個請求到direct:start端點。你應該能夠看到MyBatis從數據庫中查詢數據并返回結果。

通過以上步驟，你已經成功地在Spring Boot 2中集成了MyBatis和Apache Camel路由。