Java基础之《JdbcTemplate多数据源配置和事务管理》_多个jdbctemplate切换怎么保证事务

1、DataSourceConfig.java

package cn.xxx.coupon.pay.config;
 
import javax.sql.DataSource;
 
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
 
import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
 
 
@Configuration
public class DataSourceConfig {
 
	@Primary
	@ConfigurationProperties(prefix = "spring.datasource.druid.one")
	@Bean(name = "dsOne")
	public DataSource dsOne() {
		return DruidDataSourceBuilder.create().build();
	}
 
	@ConfigurationProperties(prefix = "spring.datasource.druid.two")
	@Bean(name = "dsTwo")
	public DataSource dsTwo() {
		return DruidDataSourceBuilder.create().build();
	}
}

2、JdbcTemplateConfig.java

package cn.xxx.coupon.pay.config;
 
import javax.sql.DataSource;
 
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.core.JdbcTemplate;
 
@Configuration
public class JdbcTemplateConfig {
 
	@Bean
	public JdbcTemplate jdbcTemplateOne(@Qualifier("dsOne") DataSource dataSource) {
		return new JdbcTemplate(dataSource);
	}
 
	@Bean
	public JdbcTemplate jdbcTemplateTwo(@Qualifier("dsTwo") DataSource dataSource) {
		return new JdbcTemplate(dataSource);
	}
}

3、yml文件配置

#定义两个数据源
spring:
  datasource:
    druid:
      one:
        driverClassName: com.mysql.cj.jdbc.Driver
        type: com.alibaba.druid.pool.DruidDataSource
        url: jdbc:mysql://localhost:3306/db1?serverTimezone=UTC
        username: db1
        password: db1
      two:
        driverClassName: com.mysql.cj.jdbc.Driver
        type: com.alibaba.druid.pool.DruidDataSource
        url: jdbc:mysql://localhost:3306/db2?serverTimezone=UTC
        username: db2
        password: db2

4、pom.xml文件配置

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
</dependency>

5、注意事项
Spring Boot 2.X 版本不再支持配置继承，多数据源的话每个数据源的所有配置都需要单独配置，否则配置不会生效
https://github.com/alibaba/druid/tree/master/druid-spring-boot-starter

6、事务管理
JdbcTemplate单数据源可以用@Transactional管理事务
多数据源@Transactional只对标识@Primary的数据源有效

7、事务管理器默认会绑定
当引入jdbc依赖之后，SpringBoot会自动默认分别注入DataSourceTransactionManager或JpaTransactionManager，所以我们不需要任何额外配置就可以用@Transactional注解进行事务的使用。spring-boot-starter-jdbc会触发DataSourceTransactionManagerAutoConfiguration这个自动化配置类，构造事务管理器

8、添加事务管理器TransactionManagerConfig.java

package cn.okcard.coupon.pay.config;
 
import javax.sql.DataSource;
 
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
 
@Configuration
public class TransactionManagerConfig {
 
	@Bean
	public DataSourceTransactionManager transactionManagerTwo(@Qualifier("dsTwo") DataSource dataSource) {
		return new DataSourceTransactionManager(dataSource);
	}
}

调用方式：

@Transactional(value="transactionManagerTwo")

参考资料：https://blog.csdn.net/liu19900205/article/details/84972595