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

1 pom.xml文件：
2 <dependency>
3    <groupId>com.microsoft.sqlserver</groupId>
4    <artifactId>mssql-jdbc</artifactId>
5    <version>6.4.0.jre8</version>
6    <scope>runtime</scope>
7 </dependency>

二.在application.properties中配置

1 spring.datasource.second.jdbc-url=jdbc:sqlserver://xxxxx:1433;DatabaseName=test
2 spring.datasource.second.username=xxx
3 spring.datasource.second.password=xxxx
4 spring.datasource.second.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver
5 
6 注意1：连接数据库的方式不一样，mysql是/test ,sqlServer是;DatabaseName=test
7 spring.datasource.url=jdbc:mysql://xxxx/test  
8 spring.datasource.second.jdbc-url=jdbc:sqlserver://xxxxx:1433;DatabaseName=test

三.配置sqlServer数据源

 1 package com.ieou.qmt.common;
 2 import org.apache.ibatis.session.SqlSessionFactory;
 3 import org.mybatis.spring.SqlSessionFactoryBean;
 4 import org.springframework.beans.factory.annotation.Qualifier;
 5 import org.springframework.boot.context.properties.ConfigurationProperties;
 6 import org.springframework.boot.jdbc.DataSourceBuilder;
 7 import org.springframework.context.annotation.Bean;
 8 import org.springframework.context.annotation.Configuration;
 9 import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
10 import org.springframework.core.io.support.ResourcePatternResolver;
11 import org.springframework.jdbc.core.JdbcTemplate;
12 import org.springframework.jdbc.datasource.DataSourceTransactionManager;
13 import org.springframework.transaction.PlatformTransactionManager;
14 import javax.sql.DataSource;
15 
16 @Configuration
17 public class SqlServerDataSourceConfig {
18 
19     @Bean(name = "sqlServerDataSource")
20     @Qualifier("sqlServerDataSource")
21     @ConfigurationProperties(prefix="spring.datasource.second")
22     public DataSource getMyDataSource(){
23         return DataSourceBuilder.create().build();
24     }
25 
26     @Bean(name = "secondaryJdbcTemplate")
27     public JdbcTemplate secondaryJdbcTemplate(
28             @Qualifier("sqlServerDataSource") DataSource dataSource) {
29         return new JdbcTemplate(dataSource);
30     }
31 }

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：

1 "org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 
2 
3 'org.springframework.transaction.PlatformTransactionManager' available
	at 
4 
5 org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:347)
	at 
6 
7 org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:334)
	at 
8 
9 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：

 1 spring.datasource.first.jdbc-url=jdbc:mysql://xxxx:3306/test
 2 （这里要是jdbc-url，不然会报jdbcUrl is required with driverClassName的错误）
 3 spring.datasource.first.type=com.alibaba.druid.pool.DruidDataSource
 4 spring.datasource.first.driver-class-name=com.mysql.jdbc.Driver
 5 spring.datasource.first.username=xxx
 6 spring.datasource.first.password=xxx
 7 
 8 spring.datasource.second.jdbc-url=jdbc:sqlserver://xxxx:1433;DatabaseName=test
 9 spring.datasource.second.username=xxx
10 spring.datasource.second.password=xxx
11 spring.datasource.second.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver

2.原来的SqlServerDataSourceConfig改为如下：

 1 package com.ieou.qmt.common;
 2 
 3 import org.apache.ibatis.session.SqlSessionFactory;
 4 import org.mybatis.spring.SqlSessionFactoryBean;
 5 import org.springframework.beans.factory.annotation.Qualifier;
 6 import org.springframework.boot.context.properties.ConfigurationProperties;
 7 import org.springframework.boot.jdbc.DataSourceBuilder;
 8 import org.springframework.context.annotation.Bean;
 9 import org.springframework.context.annotation.Configuration;
10 import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
11 import org.springframework.core.io.support.ResourcePatternResolver;
12 import org.springframework.jdbc.core.JdbcTemplate;
13 import org.springframework.jdbc.datasource.DataSourceTransactionManager;
14 import org.springframework.transaction.PlatformTransactionManager;
15 
16 import javax.sql.DataSource;
17 
18 @Configuration
19 public class SqlServerDataSourceConfig {
20 
21     private static final String MAPPER_PATH = "classpath:mybatis/mapping/mapper/*.xml";
22 
23     private static final String ENTITY_PACKAGE = "com.ieou.qmt.mapper";
24 
25     @Bean(name = "sqlServerDataSource")
26     @Qualifier("sqlServerDataSource")
27     @ConfigurationProperties(prefix="spring.datasource.second")
28     public DataSource getMyDataSource(){
29         return DataSourceBuilder.create().build();
30     }
31 
32     @Bean(name = "secondaryJdbcTemplate")
33     public JdbcTemplate secondaryJdbcTemplate(
34             @Qualifier("sqlServerDataSource") DataSource dataSource) {
35         return new JdbcTemplate(dataSource);
36     }
37 
38     @Bean(name = "second.SqlSessionTemplate")
39     public SqlSessionFactory devSqlSessionFactory(
40             @Qualifier("sqlServerDataSource") DataSource ddataSource)
41             throws Exception {
42         final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
43         sessionFactory.setDataSource(ddataSource);
44         ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
45         sessionFactory.setMapperLocations(resolver.getResources(MAPPER_PATH));
46         sessionFactory.setTypeAliasesPackage(ENTITY_PACKAGE);
47         return sessionFactory.getObject();
48     }
49 
50     @Bean
51     public PlatformTransactionManager sqlServerTransactionManager(@Qualifier("sqlServerDataSource") DataSource sqlServerDataSource)
52     {
53         return new DataSourceTransactionManager(sqlServerDataSource);
54     }
55 
56 }

3.新建mysql配置文件如下：

 1 package com.ieou.qmt.common;
 2 
 3 import org.apache.ibatis.session.SqlSessionFactory;
 4 import org.mybatis.spring.SqlSessionFactoryBean;
 5 import org.springframework.beans.factory.annotation.Qualifier;
 6 import org.springframework.boot.context.properties.ConfigurationProperties;
 7 import org.springframework.boot.jdbc.DataSourceBuilder;
 8 import org.springframework.context.annotation.Bean;
 9 import org.springframework.context.annotation.Configuration;
10 import org.springframework.context.annotation.Primary;
11 import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
12 import org.springframework.core.io.support.ResourcePatternResolver;
13 import org.springframework.jdbc.datasource.DataSourceTransactionManager;
14 import org.springframework.transaction.PlatformTransactionManager;
15 
16 import javax.sql.DataSource;
17 
18 @Configuration
19 public class MysqlDataSourceConfig {
20 
21     private static final String MAPPER_PATH = "classpath:mybatis/mapping/*.xml";
22 
23     private static final String ENTITY_PACKAGE = "com.ieou.qmt.mapper";
24 
25 
26     @Bean(name = "dataSource")
27     @Primary
28     @Qualifier("dataSource")
29     @ConfigurationProperties(prefix="spring.datasource.first")
30     public DataSource getMyDataSource(){
31         return DataSourceBuilder.create().build();
32     }
33 
34     @Bean(name = "first.SqlSessionTemplate")
35     @Primary
36     public SqlSessionFactory devSqlSessionFactory(
37             @Qualifier("dataSource") DataSource ddataSource)
38             throws Exception {
39         final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
40         sessionFactory.setDataSource(ddataSource);
41         ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
42         sessionFactory.setMapperLocations(resolver.getResources(MAPPER_PATH));
43         sessionFactory.setTypeAliasesPackage(ENTITY_PACKAGE);
44         return sessionFactory.getObject();
45     }
46 
47     @Bean
48     @Primary
49     public PlatformTransactionManager mysqlTransactionManager(@Qualifier("dataSource") DataSource mysqlDataSource)
50     {
51         return new DataSourceTransactionManager(mysqlDataSource);
52     }
53 }

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。