在SPRING BOOT中配置多个数据库

我正在尝试为我的 Spring Boot 应用程序连接 2 个不同的数据库，但出现此错误：

应用程序无法启动

描述：

com.SyncFibertToolSpring.SyncFibertTool.MydbDB.Config.MydbDbConfig 中的方法entityManagerFactory 的参数 0 需要类型为“org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder”的 bean，但无法找到。

Action:

考虑在配置中定义“org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder”类型的 bean。

下面您将找到我的 2 个数据库配置类

package com.SyncFibertToolSpring.SyncFibertTool.MydbDB.Config;

import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;


@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(entityManagerFactoryRef = "mydbEntityManagerFactory",
    basePackages = {"com.SyncFibertToolSpring.SyncFibertTool.MydbDB.DAO"})
public class MydbDbConfig {


  @Primary
  @Bean(name = "mydbDataSource")
  @ConfigurationProperties(prefix = "spring.mydb.datasource")
  public DataSource dataSource() {
    return DataSourceBuilder.create().build();
  }

  @Primary
  @Bean(name = "mydbEntityManagerFactory")
  public LocalContainerEntityManagerFactoryBean entityManagerFactory(
      EntityManagerFactoryBuilder builder, @Qualifier("mydbDataSource") DataSource dataSource) {
    return builder.dataSource(dataSource)
        .packages("com.SyncFibertToolSpring.SyncFibertTool.MydbDB.entities").

        build();
  }

  @Primary
  @Bean(name = "mydbTransactionManager")
  public PlatformTransactionManager transactionManager(
      @Qualifier("mydbEntityManagerFactory") EntityManagerFactory entityManagerFactory) {
    return new JpaTransactionManager(entityManagerFactory);
  }

}

package com.SyncFibertToolSpring.SyncFibertTool.fibertoolSyncDB.Config;

import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(entityManagerFactoryRef = "fibertoolSyncEntityManagerFactory",
    basePackages = {"com.SyncFibertToolSpring.SyncFibertTool.fibertoolSyncDB.DAO"})
public class FibertToolDbConfig {

  @Primary
  @Bean(name = "fibertoolSyncDataSource")
  @ConfigurationProperties(prefix = "spring.fibertoolsync.datasource")
  public DataSource dataSource() {
    return DataSourceBuilder.create().build();
  }

  @Primary
  @Bean(name = "fibertoolSyncEntityManagerFactory")
  public LocalContainerEntityManagerFactoryBean entityManagerFactory(
      EntityManagerFactoryBuilder builder,
      @Qualifier("fibertoolSyncDataSource") DataSource dataSource) {
    return builder.dataSource(dataSource)
        .packages("com.SyncFibertToolSpring.SyncFibertTool.fibertoolSyncDB.entities").

        build();
  }

  @Primary
  @Bean(name = "fibertoolSyncTransactionManager")
  public PlatformTransactionManager transactionManager(
      @Qualifier("fibertoolSyncEntityManagerFactory") EntityManagerFactory entityManagerFactory) {
    return new JpaTransactionManager(entityManagerFactory);
  }


}

这里的第一个错误是您定义了两个@Primary数据源。删除注释@Primary从两者之一@Configuration类并将其留给一个类