spring boot 配置双数据源mysql、sqlServer

背景：原来一直都是使用mysql数据库，在application.properties 中配置数据库信息

spring.datasource.url=jdbc:mysql://xxxx/test

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

spring.datasource.driver-class-name=com.mysql.jdbc.Driver

spring.datasource.username=xxx

spring.datasource.password=xxx

这样spring boot会自动化配置，我们用spring boot 约定的配置，现在由于业务的需要，另加一个数据源sqlServer。下面是具体步骤以及遇到的一系列问题。

一、导入依赖

 pom.xml文件：
 <dependency>
    <groupId>com.microsoft.sqlserver</groupId>
    <artifactId>mssql-jdbc</artifactId>
    <version>6.4.0.jre8</version>
    <scope>runtime</scope>
 </dependency>

二.在application.properties中配置

 spring.datasource.second.jdbc-url=jdbc:sqlserver://xxxxx:1433;DatabaseName=test
 spring.datasource.second.username=xxx
 spring.datasource.second.password=xxxx
 spring.datasource.second.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver

 注意1：连接数据库的方式不一样，mysql是/test ,sqlServer是;DatabaseName=test
 spring.datasource.url=jdbc:mysql://xxxx/test
 spring.datasource.second.jdbc-url=jdbc:sqlserver://xxxxx:1433;DatabaseName=test

三.配置sqlServer数据源

 package com.ieou.qmt.common;
 import org.apache.ibatis.session.SqlSessionFactory;
 import org.mybatis.spring.SqlSessionFactoryBean;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.boot.jdbc.DataSourceBuilder;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
 import org.springframework.core.io.support.ResourcePatternResolver;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.jdbc.datasource.DataSourceTransactionManager;
 import org.springframework.transaction.PlatformTransactionManager;
 import javax.sql.DataSource;

 @Configuration
 public class SqlServerDataSourceConfig {

     @Bean(name = "sqlServerDataSource")
     @Qualifier("sqlServerDataSource")
     @ConfigurationProperties(prefix="spring.datasource.second")
     public DataSource getMyDataSource(){
         return DataSourceBuilder.create().build();
     }

     @Bean(name = "secondaryJdbcTemplate")
     public JdbcTemplate secondaryJdbcTemplate(
             @Qualifier("sqlServerDataSource") DataSource dataSource) {
         return new JdbcTemplate(dataSource);
     }
 }

总结：

配置到这里就可以使用JdbcTemplate来操作sqlServer了，（mysql是spring boot的自动化配置，sqlServer是我们手动配置的）只要在类中注入即可

例如：（JdbcTemplate 的用法自行百度）

public class IEOUMallServiceImpl implements IEOUMallService{

@Autowired

@Qualifier("secondaryJdbcTemplate")

protected JdbcTemplate jdbcTemplate2;

}

四.以上配置完成后在执行带有@Transactional 事务的接口时会发现报错：

 "org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 

 'org.springframework.transaction.PlatformTransactionManager' available\n\tat 

 org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:347)\n\tat 

 org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:334)\n\tat 

 org.springframework.transaction.interceptor.TransactionAspectSupport.determineTransactionManage

所以：我们必须手动分别配置mysql与sqlServer

1.配置文件：application.properties 需要改为如下：

 spring.datasource.first.jdbc-url=jdbc:mysql://xxxx:3306/test
 （这里要是jdbc-url，不然会报jdbcUrl is required with driverClassName的错误）
 spring.datasource.first.type=com.alibaba.druid.pool.DruidDataSource
 spring.datasource.first.driver-class-name=com.mysql.jdbc.Driver
 spring.datasource.first.username=xxx
 spring.datasource.first.password=xxx

 spring.datasource.second.jdbc-url=jdbc:sqlserver://xxxx:1433;DatabaseName=test
 spring.datasource.second.username=xxx
 spring.datasource.second.password=xxx
 spring.datasource.second.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver

2.原来的SqlServerDataSourceConfig改为如下：

 package com.ieou.qmt.common;

 import org.apache.ibatis.session.SqlSessionFactory;
 import org.mybatis.spring.SqlSessionFactoryBean;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.boot.jdbc.DataSourceBuilder;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
 import org.springframework.core.io.support.ResourcePatternResolver;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.jdbc.datasource.DataSourceTransactionManager;
 import org.springframework.transaction.PlatformTransactionManager;

 import javax.sql.DataSource;

 @Configuration
 public class SqlServerDataSourceConfig {

     private static final String MAPPER_PATH = "classpath:mybatis/mapping/mapper/*.xml";

     private static final String ENTITY_PACKAGE = "com.ieou.qmt.mapper";

     @Bean(name = "sqlServerDataSource")
     @Qualifier("sqlServerDataSource")
     @ConfigurationProperties(prefix="spring.datasource.second")
     public DataSource getMyDataSource(){
         return DataSourceBuilder.create().build();
     }

     @Bean(name = "secondaryJdbcTemplate")
     public JdbcTemplate secondaryJdbcTemplate(
             @Qualifier("sqlServerDataSource") DataSource dataSource) {
         return new JdbcTemplate(dataSource);
     }

     @Bean(name = "second.SqlSessionTemplate")
     public SqlSessionFactory devSqlSessionFactory(
             @Qualifier("sqlServerDataSource") DataSource ddataSource)
             throws Exception {
         final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
         sessionFactory.setDataSource(ddataSource);
         ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
         sessionFactory.setMapperLocations(resolver.getResources(MAPPER_PATH));
         sessionFactory.setTypeAliasesPackage(ENTITY_PACKAGE);
         return sessionFactory.getObject();
     }

     @Bean
     public PlatformTransactionManager sqlServerTransactionManager(@Qualifier("sqlServerDataSource") DataSource sqlServerDataSource)
     {
         return new DataSourceTransactionManager(sqlServerDataSource);
     }

 }

3.新建mysql配置文件如下：

 package com.ieou.qmt.common;

 import org.apache.ibatis.session.SqlSessionFactory;
 import org.mybatis.spring.SqlSessionFactoryBean;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.boot.jdbc.DataSourceBuilder;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Primary;
 import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
 import org.springframework.core.io.support.ResourcePatternResolver;
 import org.springframework.jdbc.datasource.DataSourceTransactionManager;
 import org.springframework.transaction.PlatformTransactionManager;

 import javax.sql.DataSource;

 @Configuration
 public class MysqlDataSourceConfig {

     private static final String MAPPER_PATH = "classpath:mybatis/mapping/*.xml";

     private static final String ENTITY_PACKAGE = "com.ieou.qmt.mapper";

     @Bean(name = "dataSource")
     @Primary
     @Qualifier("dataSource")
     @ConfigurationProperties(prefix="spring.datasource.first")
     public DataSource getMyDataSource(){
         return DataSourceBuilder.create().build();
     }

     @Bean(name = "first.SqlSessionTemplate")
     @Primary
     public SqlSessionFactory devSqlSessionFactory(
             @Qualifier("dataSource") DataSource ddataSource)
             throws Exception {
         final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
         sessionFactory.setDataSource(ddataSource);
         ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
         sessionFactory.setMapperLocations(resolver.getResources(MAPPER_PATH));
         sessionFactory.setTypeAliasesPackage(ENTITY_PACKAGE);
         return sessionFactory.getObject();
     }

     @Bean
     @Primary
     public PlatformTransactionManager mysqlTransactionManager(@Qualifier("dataSource") DataSource mysqlDataSource)
     {
         return new DataSourceTransactionManager(mysqlDataSource);
     }
 }

4.从事务管理器中选择一个事务，在方法上加@Transactional(value = "mysqlTransactionManager",rollbackFor = Exception.class)

 

至此：配置完毕，如有不足或不对的地方，请补充。