java - Multi-Tenancy 数据源之间的动态切换不起作用

Question

我正在尝试在我的 Spring Boot 应用程序中实现 Multi-Tenancy 。我指的是“http://anakiou.blogspot.com/2015/08/multi-tenant-application-with-spring.html ”示例。在此示例中，一切正常。但在我的代码中，数据源之间的切换没有发生。

在我的 DataSourceConfig.java 中，我面临着声明 3 个 Bean 的问题，所以我使用 @Primary 注释。如果我删除 @Primary 注释，我会收到以下错误

' Parameter 1 of method liquibase in com.config.DatabaseConfiguration required a single bean, but 3 were found:
- dataSource: defined by method 'dataSource1' in class path resource [com/config/DataSourceConfig.class]
- dataSource2: defined by method 'dataSource2' in class path resource [com/config/DataSourceConfig.class]
- dataSource3: defined by method 'dataSource3' in class path resource [com/config/DataSourceConfig.class] ' 

但是，如果我使用 @Primary 注释，无论租户 id 是什么，它都会将数据存储在用 @Primary 注释的 DataSource 中。所以数据源的切换没有发生。

这是我的 DataSourceConfig 类

package com.config;
import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Required;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
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.netflix.governator.annotations.binding.Secondary;

@Configuration
public class DataSourceConfig {

@Autowired
private MultitenancyProperties multitenancyProperties;

@Primary
@Bean(name =  {"dataSource" , "dataSource1"})
@ConfigurationProperties(prefix = "spring.datasource.datasource1")
public DataSource dataSource1() {
    DataSourceBuilder factory = DataSourceBuilder
            .create(this.multitenancyProperties.getDatasource1().getClassLoader())
            //.driverClassName(this.multitenancyProperties.getDatasource1().getDriverClassName())
            .username(this.multitenancyProperties.getDatasource1().getUsername())
            .password(this.multitenancyProperties.getDatasource1().getPassword())
            .url(this.multitenancyProperties.getDatasource1().getUrl());
    return factory.build();
}


@Bean(name = {"dataSource2"})
@ConfigurationProperties(prefix = "spring.datasource.datasource2")
public DataSource dataSource2(@Qualifier("dataSource1") DataSource dataSource1) {
    System.out.println("Entered to 2");
    DataSourceBuilder factory = DataSourceBuilder
            .create(this.multitenancyProperties.getDatasource2().getClassLoader())
            //.driverClassName(this.multitenancyProperties.getDatasource2().getDriverClassName())
            .username(this.multitenancyProperties.getDatasource2().getUsername())
            .password(this.multitenancyProperties.getDatasource2().getPassword())
            .url(this.multitenancyProperties.getDatasource2().getUrl());
    return factory.build();
}


@Bean(name = {"dataSource3"})
@ConfigurationProperties(prefix = "spring.datasource.datasource3")
public DataSource dataSource3() {
    DataSourceBuilder factory = DataSourceBuilder
            .create(this.multitenancyProperties.getDatasource3().getClassLoader())
            //.driverClassName(this.multitenancyProperties.getDatasource3().getDriverClassName())
            .username(this.multitenancyProperties.getDatasource3().getUsername())
            .password(this.multitenancyProperties.getDatasource3().getPassword())
            .url(this.multitenancyProperties.getDatasource3().getUrl());
    return factory.build();
}}

Answer 1

禁用Spring的DataSourceAutoConfiguration并提供我们的 Multi-Tenancy DataSourceConfig。这将从 MultitenancyProperties 加载属性，而该属性又由 application.properties 配置并相应地配置我们的数据源。要排除 DataSourceAutoConfiguration 使用 @EnableAutoConfiguration

@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class})