首先导入mybatis等包，这里就不多说。
下面是配置多数据源和mybatis，每个数据源对应一套mybatis模板
数据源1：
1 package com.aaaaaaa.config.datasource;
2
3 import javax.sql.DataSource;
4
5 import org.apache.ibatis.session.SqlSessionFactory;
6 import org.mybatis.spring.SqlSessionFactoryBean;
7 import org.mybatis.spring.SqlSessionTemplate;
8 import org.mybatis.spring.annotation.MapperScan;
9 import org.springframework.beans.factory.annotation.Qualifier;
10 import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
11 import org.springframework.boot.context.properties.ConfigurationProperties;
12 import org.springframework.context.annotation.Bean;
13 import org.springframework.context.annotation.Configuration;
14 import org.springframework.context.annotation.Primary;
15 import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
16 import org.springframework.jdbc.datasource.DataSourceTransactionManager;
17
18 /**
19 *
20 * @desc 支持多数据源配置，复制一份代码修改所有appdb即可<br>
21 * 以该数据源为主数据源。只能设置@Primary到一份数据源作为主数据源
22 * @author josnow
23 * @date 2018年1月12日 下午9:58:18
24 * @version 1.0.0
25 */
26 @Configuration
27 @MapperScan(basePackages = "com.aaaaaaa.mapper.appdb", sqlSessionTemplateRef = "appdbSqlSessionTemplate")
28 public class DataSourceConfigappdb {
29
30 @Bean(name = "appdbDataSource")
31 @ConfigurationProperties(prefix = "spring.datasource.appdb")
32 @Primary
33 public DataSource testDataSource() {
34 return DataSourceBuilder.create().build();
35 }
36
37 @Bean(name = "appdbSqlSessionFactory")
38 @Primary
39 public SqlSessionFactory testSqlSessionFactory(@Qualifier("appdbDataSource") DataSource dataSource)
40 throws Exception {
41 SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
42 bean.setDataSource(dataSource);
43 bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/appdb/*.xml"));
44 return bean.getObject();
45 }
46
47 @Bean(name = "appdbTransactionManager")
48 @Primary
49 public DataSourceTransactionManager testTransactionManager(@Qualifier("appdbDataSource") DataSource dataSource) {
50 return new DataSourceTransactionManager(dataSource);
51 }
52
53 @Bean(name = "appdbSqlSessionTemplate")
54 @Primary
55 public SqlSessionTemplate testSqlSessionTemplate(
56 @Qualifier("appdbSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
57 return new SqlSessionTemplate(sqlSessionFactory);
58 }
59
60 }
application.yml配置
spring:
datasource:
appdb:
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://********:3306/******?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true
username: ********
password: ********
initialSize: 5
minIdle: 5
maxActive: 20
testWhileIdle: true
validationQuery: select 1
filters: stat,wall,log4j
就这样配置完了第一个数据源和mybatis。
第一个数据源由appdbTransactionManager来管理事务，在使用事务的时候用@Transactional(value = "appdbTransactionManager")注解来表明使用哪个事务管理器。
这里并未采用分布式事务管理器，分布式事务管理器是个大话题，如果你考虑分布式事务可以自己改造。
下面进行第二个数据源和mybatis的配置
1 package com.aaaaaaa.config.datasource;
2
3 import javax.sql.DataSource;
4
5 import org.apache.ibatis.session.SqlSessionFactory;
6 import org.mybatis.spring.SqlSessionFactoryBean;
7 import org.mybatis.spring.SqlSessionTemplate;
8 import org.mybatis.spring.annotation.MapperScan;
9 import org.springframework.beans.factory.annotation.Qualifier;
10 import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
11 import org.springframework.boot.context.properties.ConfigurationProperties;
12 import org.springframework.context.annotation.Bean;
13 import org.springframework.context.annotation.Configuration;
14 import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
15 import org.springframework.jdbc.datasource.DataSourceTransactionManager;
16
17 @Configuration
18 @MapperScan(basePackages = "com.aaaaaaa.mapper.testdb", sqlSessionTemplateRef = "testdbSqlSessionTemplate")
19 public class DataSourceConfigtestdb {
20
21 @Bean(name = "testdbDataSource")
22 @ConfigurationProperties(prefix = "spring.datasource.testdb")
23 public DataSource testDataSource() {
24 return DataSourceBuilder.create().build();
25 }
26
27 @Bean(name = "testdbSqlSessionFactory")
28 public SqlSessionFactory testSqlSessionFactory(@Qualifier("testdbDataSource") DataSource dataSource)
29 throws Exception {
30 SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
31 bean.setDataSource(dataSource);
32 bean.setMapperLocations(
33 new PathMatchingResourcePatternResolver().getResources("classpath:mapper/testdb/*.xml"));
34 return bean.getObject();
35 }
36
37 @Bean(name = "testdbTransactionManager")
38 public DataSourceTransactionManager testTransactionManager(@Qualifier("testdbDataSource") DataSource dataSource) {
39 return new DataSourceTransactionManager(dataSource);
40 }
41
42 @Bean(name = "testdbSqlSessionTemplate")
43 public SqlSessionTemplate testSqlSessionTemplate(
44 @Qualifier("testdbSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
45 return new SqlSessionTemplate(sqlSessionFactory);
46 }
47
48 }
数据源2的配置
application.yml配置
spring:
datasource:
appdb:
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://********:3306/******?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true
username: ********
password: ********
initialSize: 5
minIdle: 5
maxActive: 20
testWhileIdle: true
validationQuery: select 1
filters: stat,wall,log4j testdb:
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://********:3306/******?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true
username: ********
password: ********
initialSize: 5
minIdle: 5
maxActive: 20
testWhileIdle: true
validationQuery: select 1
filters: stat,wall,log4j
看一下两个数据源有哪些不同之处：
1：数据源2其实是由数据源1copy了一份代码，并将全部appdb改为testdb
2：此外数据源1有@Primary注解，而数据源2没有@Primary注解。使用@Primary注解是将数据源1作为默认数据源，并且多个数据源必须指定一个默认的数据源，否则会启动报错。
mybatis多数据源就是这么简单
来源：https://www.cnblogs.com/wulm/p/8446430.html