基于SpringBoot实现动态配置数据库的加载

spring:
  datasource:
    #开启MySQL
    enabled: true
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?createDatabaseIfNotExist=true&useSSL=false&serverTimezone=GMT%2b8&characterEncoding=utf8&connectTimeout=30000&socketTimeout=30000&autoReconnect=true&cachePrepStmts=true&useServerPrepStmts=true
    username: root
    password: 123456
    type: com.zaxxer.hikari.HikariDataSource
    hikari:
      # 连接池名称
      pool-name: MyHikariCP
      #最小空闲连接，默认值10，小于0或大于maximum-pool-size，都会重置为maximum-pool-size
      minimum-idle: 10
      #连接池最大连接数，默认是10 (cpu核数量 * 2 + 硬盘数量)
      maximum-pool-size: 30
      #空闲连接超时时间，默认值600000（10分钟），大于等于max-lifetime且max-lifetime>0，会被重置为0；不等于0且小于10秒，会被重置为10秒。
      idle-timeout: 600000
      #连接最大存活时间，不等于0且小于30秒，会被重置为默认值30分钟.设置应该比mysql设置的超时时间短
      max-lifetime: 1800000
      #连接超时时间：毫秒，小于250毫秒，否则被重置为默认值30秒
      connection-timeout: 30000
      #用于测试连接是否可用的查询语句
      connection-test-query: SELECT 1

  jpa:
    database: mysql
    show-sql: false
    hibernate:
      naming:
        physical-strategy: org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
      ddl-auto: update
    properties:
      hibernate:
        jdbc:
          batch_size: 100
        dialect: org.hibernate.dialect.MySQL5InnoDBDialect
        enable_lazy_load_no_trans: true
    open-in-view: false

@SpringBootApplication(exclude = { DataSourceAutoConfiguration.class })
public class OcrsrvcApplication {
    public static void main(String[] args) {
        SpringApplication.run(OcrsrvcApplication.class, args);
    }
}

@Configuration
@ConditionalOnProperty(name = "spring.datasource.enabled", havingValue = "true")
@Slf4j
public class DataSourceConfig {

    @Value("${spring.datasource.url}")
    private String jdbcUrl;

    @Value("${spring.datasource.driver-class-name}")
    private String driverClassName;

    @Value("${spring.datasource.username}")
    private String username;

    @Value("${spring.datasource.password}")
    private String password;

    @Value("${spring.datasource.hikari.pool-name}")
    private String poolName;

    @Value("${spring.datasource.hikari.minimum-idle}")
    private int minimumIdle;

    @Value("${spring.datasource.hikari.maximum-pool-size}")
    private int maximumPoolSize;

    @Value("${spring.datasource.hikari.idle-timeout}")
    private long idleTimeout;

    @Value("${spring.datasource.hikari.max-lifetime}")
    private long maxLifetime;

    @Value("${spring.datasource.hikari.connection-timeout}")
    private long connectionTimeout;

    @Value("${spring.datasource.hikari.connection-test-query}")
    private String connectionTestQuery;

    @Bean
    public DataSource dataSource() {

        log.info("====加载数据库===");
        HikariConfig hikariConfig = new HikariConfig();

        hikariConfig.setJdbcUrl(jdbcUrl);
        hikariConfig.setDriverClassName(driverClassName);
        hikariConfig.setUsername(username);
        hikariConfig.setPassword(password);
        hikariConfig.setPoolName(poolName);
        hikariConfig.setMinimumIdle(minimumIdle);
        hikariConfig.setMaximumPoolSize(maximumPoolSize);
        hikariConfig.setIdleTimeout(idleTimeout);
        hikariConfig.setMaxLifetime(maxLifetime);
        hikariConfig.setConnectionTimeout(connectionTimeout);
        hikariConfig.setConnectionTestQuery(connectionTestQuery);

        return new HikariDataSource(hikariConfig);
    }
}

@Autowired(required = false)  
private XxxRepository xxxRepository;