Spring Boot多数据源的配置

在实际的项目开发过程中，随着项目业务量的不断扩大，我们通常会进行数据库拆分或是引入其他数据库，从而我们需要配置多个数据源

手工配置两组DataSource及相关内容

与Spring Boot协同工作

• 配置@Primary类型的Bean
• 排除Spring Boot的自动配置
  • DataSourceAutoConfiguration
  • DataSourceTransactionManagerAutoConfiguration
  • JdbcTemplateAutoConfiguration

pom.xml引入相关依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.james.demo</groupId>
    <artifactId>multi-datasource-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>multi-datasource-demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.properties分别配置两组数据源，不同数据源的配置要分开

spring.output.ansi.enabled=always

## foo datasource
foo.datasource.url=jdbc:h2:mem:foo
foo.datasource.username=sa
foo.datasource.password=

## bar datasource
bar.datasource.url=jdbc:h2:mem:bar
bar.datasource.username=sa
bar.datasource.password=

具体代码实现

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;

import javax.annotation.Resource;
import javax.sql.DataSource;

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class,
        DataSourceTransactionManagerAutoConfiguration.class, JdbcTemplateAutoConfiguration.class})
public class MultiDatasourceDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(MultiDatasourceDemoApplication.class, args);
    }

    @Bean
    public DataSource fooDataSource(){
        DataSourceProperties dataSourceProperties = fooDataSourceProperties();
        System.out.println("fooDataSource: {} "+dataSourceProperties.getUrl());
        return dataSourceProperties.initializeDataSourceBuilder().build();
    }

    @Bean
    @ConfigurationProperties("foo.datasource")
    public DataSourceProperties fooDataSourceProperties() {
       return new DataSourceProperties();
    }

    @Bean
    @Resource
    public PlatformTransactionManager fooTxManager(DataSource fooDataSource){
        return new DataSourceTransactionManager(fooDataSource);
    }


    @Bean
    @Primary
    public DataSource barDataSource(){
        DataSourceProperties dataSourceProperties = barDataSourceProperties();
        System.out.println("barDataSource: {} "+dataSourceProperties.getUrl());
        return dataSourceProperties.initializeDataSourceBuilder().build();
    }

    @Bean
    @ConfigurationProperties("bar.datasource")
    public DataSourceProperties barDataSourceProperties() {
        return new DataSourceProperties();
    }

    @Bean
    @Resource
    public PlatformTransactionManager barTxManager(DataSource barDataSource){
        return new DataSourceTransactionManager(barDataSource);
    }

运行结果如下所示

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