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  • 1.springboot配置多数据源的极简实现

    一种办法是手工切换多个数据源,此处不做介绍。
    另一种方法是一定程度上与SpringBoot配合使用。

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

        DataSourceAutoConfiguration

        DataSourceTransactionManagerAutoCongfiguration
        jdbcTemplateAutoConfiguration

     以下程序使用H2数据库。H2创建完 foo 和 bar 数据库之后要关闭,否则启动springboot会报错。

    启动程序:

    package com.example.MultiDataSourceDemoApplication;
    
    import lombok.extern.slf4j.Slf4j;
    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.jdbc.datasource.DataSourceTransactionManager;
    import org.springframework.transaction.PlatformTransactionManager;
    
    import javax.annotation.Resource;
    import javax.sql.DataSource;
    
    @SpringBootApplication(exclude = {DataSourceAutoConfiguration.class,
            DataSourceTransactionManagerAutoConfiguration.class,
            JdbcTemplateAutoConfiguration.class})
    @Slf4j
    public class MultiDataSourceDemoApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(MultiDataSourceDemoApplication.class, args);
        }
    
        @Bean
        @ConfigurationProperties("foo.datasource")
        public DataSourceProperties fooDataSourceProperties() {
            return new DataSourceProperties();
        }
    
        @Bean
        public DataSource fooDataSource() {
            DataSourceProperties dataSourceProperties = fooDataSourceProperties();
            log.info("foo datasource: {}", dataSourceProperties.getUrl());
            return dataSourceProperties.initializeDataSourceBuilder().build();
        }
    
        @Bean
        @Resource
        public PlatformTransactionManager fooTxManager(DataSource fooDataSource) {
            return new DataSourceTransactionManager(fooDataSource);
        }
    
        @Bean
        @ConfigurationProperties("bar.datasource")
        public DataSourceProperties barDataSourceProperties() {
            return new DataSourceProperties();
        }
    
        @Bean
        public DataSource barDataSource() {
            DataSourceProperties dataSourceProperties = barDataSourceProperties();
            log.info("bar datasource: {}", dataSourceProperties.getUrl());
            return dataSourceProperties.initializeDataSourceBuilder().build();
        }
    
        @Bean
        @Resource
        public PlatformTransactionManager barTxManager(DataSource barDataSource) {
            return new DataSourceTransactionManager(barDataSource);
        }
    }

    application.properties文件:

    management.endpoints.web.exposure.include=*
    spring.output.ansi.enabled=always
    
    foo.datasource.url=jdbc:h2:F:/h2data/foo
    foo.datasource.username=sa
    foo.datasource.password=
    
    bar.datasource.url=jdbc:h2:F:/h2data/bar
    bar.datasource.username=sa
    bar.datasource.password=

    pom.xml文件:

    <?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>2.4.3</version>
            <relativePath/> <!-- lookup parent from repository -->
        </parent>
        <groupId>com.example</groupId>
        <artifactId>MultiDataSourceDemoApplication</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>MultiDataSourceDemoApplication</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-actuator</artifactId>
            </dependency>
            <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>com.h2database</groupId>
                <artifactId>h2</artifactId>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

    执行日志:

     

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  • 原文地址:https://www.cnblogs.com/tzzt01/p/14509759.html
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