如何在 Spring Boot 中使用 HikariCP 与 Flyway 结合使用两个数据源

Question

我想在我的 Spring 启动应用程序中使用 HikariCP 作为 JDBC 连接池。 我有两个数据源（MySQL 数据库作为主数据库并通过 Hibernate 访问这些数据，另外还有一个 Oracle 数据库用于通过 JDBCTemplate 读取一些其他数据）。

我将 MySQL 数据源设置为主 bean：

@Bean
@Primary
@ConfigurationProperties("spring.datasource")
public DataSourceProperties mySQLDataSourceProperties() {
    return new DataSourceProperties();
}


@Bean
@Primary
@ConfigurationProperties("spring.datasource")
public DataSource mySQLDataSource() {
    return mySQLDataSourceProperties().initializeDataSourceBuilder().build();
}

@Bean
@ConfigurationProperties("oracle.datasource")
public DataSourceProperties oracleDataSourceProperties() {
    return new DataSourceProperties();
}

@Bean(name = "oracleDatabase")
@ConfigurationProperties("oracle.datasource")
public DataSource oracleDataSource() {
    return oracleDataSourceProperties().initializeDataSourceBuilder().build();
}

 @Bean
 public JdbcTemplate oracleJdbcTemplate(@Qualifier("oracleDatabase") DataSource oracleDb) {
     return new JdbcTemplate(oracleDb);
 }

我将以下配置放在我的 application.properties 中：

spring.datasource.type=com.zaxxer.hikari.HikariDataSource

spring.datasource.hikari.minimum-idle=7
spring.datasource.hikari.pool-name=Test-1

spring.datasource.hikari.data-source-properties.prepStmtCacheSize=250
spring.datasource.hikari.data-source-properties.prepStmtCacheSqlLimit=2048
spring.datasource.hikari.data-source-properties.cachePrepStmts=true
spring.datasource.hikari.data-source-properties.useServerPrepStmts=true

不幸的是，这些 HikariCP 配置没有被读取：

 HikariConfig - dataSourceJNDI..................none
 HikariConfig - dataSourceProperties............{password=<masked>}
 HikariConfig - driverClassName................."com.mysql.jdbc.Driver"
 HikariConfig - healthCheckProperties...........{}
 HikariConfig - healthCheckRegistry.............none
 HikariConfig - idleTimeout.....................600000
 HikariConfig - initializationFailFast..........true
 HikariConfig - initializationFailTimeout.......1
 HikariConfig - isolateInternalQueries..........false
 HikariConfig - jdbc4ConnectionTest.............false
 HikariConfig - jdbcUrl........................."jdbc:mysql://localhost:3306/testDB"
 HikariConfig - leakDetectionThreshold..........0
 HikariConfig - maxLifetime.....................1800000
 HikariConfig - maximumPoolSize.................10
 HikariConfig - metricRegistry..................none
 HikariConfig - metricsTrackerFactory...........none
 HikariConfig - minimumIdle.....................10
 HikariConfig - password........................<masked>
 HikariConfig - poolName........................"HikariPool-1"

创建 HikariCP bean 并停用 DataSource 自动配置并删除“spring.datasource”：

@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class})
@SpringBootApplication
@ComponentScan
public class SpringApplication {


@Bean
@Primary
@ConfigurationProperties(prefix = "spring.datasource.hikari")
public HikariConfig hikariConfig() {
    return new HikariConfig();
}

@Bean
public DataSource dataSource() {
    return new HikariDataSource(hikariConfig());
}

解决了我的问题：

 HikariConfig - dataSourceJNDI..................none
 HikariConfig - dataSourceProperties............{password=<masked>, prepStmtCacheSqlLimit=2048, cachePrepStmts=true, useServerPrepStmts=true, prepStmtCacheSize=250}
 HikariConfig - driverClassName................."com.mysql.jdbc.Driver"
 HikariConfig - healthCheckProperties...........{}
 HikariConfig - healthCheckRegistry.............none
 HikariConfig - idleTimeout.....................600000
 HikariConfig - initializationFailFast..........true
 HikariConfig - initializationFailTimeout.......1
 HikariConfig - isolateInternalQueries..........false
 HikariConfig - jdbc4ConnectionTest.............false
 HikariConfig - jdbcUrl........................."jdbc:mysql://localhost:3306/testDB?autoReconnect=true"
 HikariConfig - leakDetectionThreshold..........0
 HikariConfig - maxLifetime.....................1800000
 HikariConfig - poolName........................"Test-1"

但是随后 Flyway 显示了一些以前未显示的奇怪警告，我必须在运行 Spring 应用程序之前手动创建数据库模式，即：创建模式不再起作用。

[WARN ] JdbcTemplate - DB: Can't create database 'test'; database exists (SQL State: HY000 - Error Code: 1007)
[WARN ] JdbcTemplate - DB: Unknown table 'testSchema.tenant' (SQL State: 42S02 - Error Code: 1051)
[WARN ] JdbcTemplate - DB: Unknown table 'testSchema.user' (SQL State: 42S02 - Error Code: 1051) 

我的 Flyway SQL 脚本是普通的 DDL 脚本：

CREATE SCHEMA IF NOT EXISTS `testSchema` DEFAULT CHARACTER SET utf8 ;

DROP TABLE IF EXISTS `testSchema`.`tenant`;

CREATE TABLE `testSchema`.`tenant` (
  `id` int NOT NULL AUTO_INCREMENT,

我认为禁用自动数据源配置不是最好的解决方案，因为 Flyway 停止创建模式并显示警告。 有没有其他方法可以解决这个问题？

Answer 1

声明您自己的DataSource已经隐式禁用了 Spring Boot 对数据源的自动配置。 换句话说，这不会产生任何影响：

@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class})

我认为问题在于您没有将特定于 Hikari 的配置绑定到您的 MySQL DataSource 。 你需要做这样的事情：

@Bean
@Primary
@ConfigurationProperties("spring.datasource.hikari")
public DataSource mySQLDataSource() {
    return mySQLDataSourceProperties().initializeDataSourceBuilder().build();
}

这意味着您的mySQLDataSourceProperties配置了通用数据源配置。 然后他们创建一个HikariDataSource ，它进一步配置了 Hikari 特定的配置。

Answer 2

感谢安迪快速而有价值的回答！ 你让我走上了正轨。 在摆弄之后，我发现这个配置对我有用：

    @Bean
    @Primary
    @ConfigurationProperties("spring.datasource") 
  //@ConfigurationProperties("spring.datasource.hikari") can also be used, no difference
    public DataSourceProperties mySQLDataSourceProperties() {
        return new DataSourceProperties();
    }

    @Bean
    @Primary
    @ConfigurationProperties("spring.datasource.hikari")
    public DataSource mySQLDataSource() {
        return mySQLDataSourceProperties().initializeDataSourceBuilder().build();
    }

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource.hikari")
    public HikariConfig hikariConfig() {
        return new HikariConfig();
    }

    @Bean
    public DataSource dataSource() {
        return new HikariDataSource(hikariConfig());
    }

我必须在 application.properties 中添加这些设置：

# this is absolutely mandatory otherwise BeanInstantiationException in mySQLDataSource ! 
spring.datasource.url=${JDBC_CONNECTION_STRING}

spring.datasource.hikari.jdbc-url=${JDBC_CONNECTION_STRING}

spring.datasource.hikari.username=user
spring.datasource.hikari.password=pass

Answer 3

我使用了以下方法

    first.datasource.jdbc-url=jdbc-url
    first.datasource.username=username
    first.datasource.password=password
    .
    .
    .
    .
    =================== In Java Configuration File ==================
    
    @Primary
   @Bean(name = "firstDataSource")
        @ConfigurationProperties(prefix = "first.datasource")
        public DataSource dataSource() {
            return DataSourceBuilder.create().build();
        }
    

@Primary
        @Bean(name = "firstEntityManagerFactory")
        public LocalContainerEntityManagerFactoryBean barEntityManagerFactory(EntityManagerFactoryBuilder builder,
                @Qualifier("firstDataSource") DataSource dataSource) {
            Map<String, String> props = new HashMap<String, String>();
            props.put("spring.jpa.database-platform",  "org.hibernate.dialect.Oracle12cDialect");
    .
    .
    .
    
            return builder.dataSource(dataSource).packages("com.first.entity").persistenceUnit("firstDB")
                    .properties(props)
                    .build();
        }

    @Primary
        @Bean(name = "firstTransactionManager")
        public PlatformTransactionManager firstTransactionManager(
                @Qualifier("firstEntityManagerFactory") EntityManagerFactory firstEntityManagerFactory) {
            return new JpaTransactionManager(firstEntityManagerFactory);
        }

second.datasource.jdbc-url=jdbc-url
second.datasource.username=username
second.datasource.password=password
.
.
.
.
=================== In Java Configuration File ==================

   @Bean(name = "secondDataSource")
    @ConfigurationProperties(prefix = "second.datasource")
    public DataSource dataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "secondEntityManagerFactory")
    public LocalContainerEntityManagerFactoryBean barEntityManagerFactory(EntityManagerFactoryBuilder builder,
            @Qualifier("secondDataSource") DataSource dataSource) {
        Map<String, String> props = new HashMap<String, String>();
        props.put("spring.jpa.database-platform",  "org.hibernate.dialect.Oracle12cDialect");
.
.
.

        return builder.dataSource(dataSource).packages("com.second.entity").persistenceUnit("secondDB")
                .properties(props)
                .build();
    }

    @Bean(name = "secondTransactionManager")
    public PlatformTransactionManager secondTransactionManager(
            @Qualifier("secondEntityManagerFactory") EntityManagerFactory secondEntityManagerFactory) {
        return new JpaTransactionManager(secondEntityManagerFactory);
    }