SpringMVC + Mybatis 多数据源配置

比较常用的配置，多数据源、主从等等。

大概的逻辑是：

1、spring-mybatis.xml中配置多个数据源

2、使用Spring提供的AbstractRoutingDataSource类来根据请求路由到不同的数据源

3、ThreadLocal解决线程安全问题

详情参考：

【Java】一次SpringMVC+ Mybatis 配置多数据源经历

利用Spring的AbstractRoutingDataSource解决多数据源的问题

spring官网demo：Dynamic DataSource Routing

一直没调通，切换后仍是默认数据库！！！

=================放弃spring动态数据源，用mybatis的environments来解决=============

关于mybatis的environments，请查询官网文档：http://www.mybatis.org/mybatis-3/zh/configuration.html#environments

一、mybatis-conf.xml 配置两个数据源：<environment id="env_stg">，<environment id="env_vtp">

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC
        "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!-- 引入配置文件 -->
    <properties resource="jdbc.properties"/>
    <settings>
        <!-- 驼峰命名自动映射 -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
    <!-- bean短别名 -->
    <typeAliases>
        <package name="qa.vop.model" />
    </typeAliases>
    <!-- 多环境配置 -->
    <environments default="env_stg">
        <environment id="env_stg">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${driver}" />
                <property name="url" value="${url}" />
                <property name="username" value="${username}" />
                <property name="password" value="${password}" />
            </dataSource>
        </environment>
        <environment id="env_vtp">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${driver}" />
                <property name="url" value="${url_vtp}" />
                <property name="username" value="${username_vtp}" />
                <property name="password" value="${password_vtp}" />
            </dataSource>
        </environment>
    </environments>
     <!-- xml映射文件 -->
     <mappers>
        <package name="qa.vop.dao"/>
    </mappers>
</configuration>

二、写一个类，根据不同的环境来build SqlSessionFactory

public class MySQLSessionFactory {

    private SqlSessionFactory sqlSessionFactory = null;

    public SqlSessionFactory getSqlSessionFactory(String cfgFilePath,String env) {
        InputStream is = null;
        try {
            is = Resources.getResourceAsStream("mybatis-conf.xml");
            if (null == env || env.isEmpty()) {
                sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
            } else {
                sqlSessionFactory = new SqlSessionFactoryBuilder().build(is,env);
            }
        } catch (IOException e) {
            System.out.println(e.getMessage());
        }
        return sqlSessionFactory;
    }
}

三、controller中，根据不同环境，来切换数据源。

@Controller
public class SuperController{

    private static final String MYBATIS_CFG = "mybatis-conf.xml";
    private static SqlSession session = new MySQLSessionFactory().getSqlSessionFactory(MYBATIS_CFG,null).openSession();

    @RequestMapping("/queryJit")
    public ModelAndView getJit(ModelAndView mv){
        mv.addObject("jitList", session.getMapper(JitMapper.class).selectAllJits() );
        mv.setViewName("jit");
        return mv;
    }

    @RequestMapping("/queryVTP")
    public ModelAndView getVTPRunResult(ModelAndView mv){
        SqlSession session1 = new MySQLSessionFactory().getSqlSessionFactory(MYBATIS_CFG,"env_vtp").openSession();
        mv.addObject("vtpRunResultList", session1.getMapper(VtpRunResultMapper.class).selectAllResults() );
        mv.setViewName("quality-vtp");
        return mv;
    }
}