如何使用spring的2个或更多数据库？

Question

我有一个运行Spring MVC的应用程序。

我需要它来访问我的应用程序中的2个不同的数据库（一个是PostgreSQL，另一个是MySQL数据库）。

如何仅使用注释或application.properties文件配置它？

问候。

Answer 1

以下是multiple Database/datasource上Spring-Boot的示例代码我希望它有所帮助！

<强> application.properties

spring.ds_items.driverClassName=org.postgresql.Driver 
spring.ds_items.url=jdbc:postgresql://srv0/test 
spring.ds_items.username=test0 
spring.ds_items.password=test0 


spring.ds_users.driverClassName=org.postgresql.Driver 
spring.ds_users.url=jdbc:postgresql://srv1/test 
spring.ds_users.username=test1 
spring.ds_users.password=test1 

<强> DatabaseItemsConfig.java

package sb; 

import org.springframework.boot.autoconfigure.jdbc.TomcatDataSourceConfiguration; 
import org.springframework.boot.context.properties.ConfigurationProperties; 
import org.springframework.context.annotation.Bean; 
import org.springframework.context.annotation.Configuration; 
import org.springframework.jdbc.core.JdbcTemplate; 

import javax.sql.DataSource; 

@Configuration 
@ConfigurationProperties(name = "spring.ds_items") 
public class DatabaseItemsConfig extends TomcatDataSourceConfiguration { 

    @Bean(name = "dsItems") 
    public DataSource dataSource() { 
        return super.dataSource(); 
    } 

    @Bean(name = "jdbcItems") 
    public JdbcTemplate jdbcTemplate(DataSource dsItems) { 
        return new JdbcTemplate(dsItems); 
    } 
} 

<强> DatabaseUsersConfig.java

package sb; 

import org.springframework.boot.autoconfigure.jdbc.TomcatDataSourceConfiguration; 
import org.springframework.boot.context.properties.ConfigurationProperties; 
import org.springframework.context.annotation.Bean; 
import org.springframework.context.annotation.Configuration; 
import org.springframework.jdbc.core.JdbcTemplate; 

import javax.sql.DataSource; 

@Configuration 
@ConfigurationProperties(name = "spring.ds_users") 
public class DatabaseUsersConfig extends TomcatDataSourceConfiguration { 

    @Bean(name = "dsUsers") 
    public DataSource dataSource() { 
        return super.dataSource(); 
    } 

    @Bean(name = "jdbcUsers") 
    public JdbcTemplate jdbcTemplate(DataSource dsUsers) { 
        return new JdbcTemplate(dsUsers); 
    } 

} 

<强> ItemRepository.java

package sb; 

import org.slf4j.Logger; 
import org.slf4j.LoggerFactory; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.beans.factory.annotation.Qualifier; 
import org.springframework.jdbc.core.JdbcTemplate; 
import org.springframework.jdbc.core.RowMapper; 
import org.springframework.stereotype.Repository; 

import java.sql.ResultSet; 
import java.sql.SQLException; 

@Repository 
public class ItemRepository { 
    protected final Logger log = LoggerFactory.getLogger(getClass()); 

    @Autowired 
    @Qualifier("jdbcItems") 
    protected JdbcTemplate jdbc; 

    public Item getItem(long id) { 
        return jdbc.queryForObject("SELECT * FROM sb_item WHERE id=?", itemMapper, id); 
    } 

    private static final RowMapper<Item> itemMapper = new RowMapper<Item>() {
        public Item mapRow(ResultSet rs, int rowNum) throws SQLException { 
            Item item = new Item(rs.getLong("id"), rs.getString("title")); 
            item.price = rs.getDouble("id"); 
            return item; 
        } 
    }; 
} 

<强> UserRepository.java

package sb; 

import org.slf4j.Logger; 
import org.slf4j.LoggerFactory; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.beans.factory.annotation.Qualifier; 
import org.springframework.jdbc.core.JdbcTemplate; 
import org.springframework.jdbc.core.RowMapper; 
import org.springframework.stereotype.Repository; 

import java.sql.ResultSet; 
import java.sql.SQLException; 

@Repository 
public class UserRepository { 
    protected final Logger log = LoggerFactory.getLogger(getClass()); 

    @Autowired 
    @Qualifier("jdbcUsers") 
    protected JdbcTemplate jdbc; 

    public User getUser(long id) { 
        return jdbc.queryForObject("SELECT * FROM sb_user WHERE id=?", userMapper, id); 
    } 

    private static final RowMapper<User> userMapper = new RowMapper<User>() {
        public User mapRow(ResultSet rs, int rowNum) throws SQLException { 
            User user = new User(rs.getLong("id"), rs.getString("name")); 
            user.alias = rs.getString("alias"); 
            return user; 
        } 
    }; 
} 

<强> Controller.java

package sb; 

import org.slf4j.Logger; 
import org.slf4j.LoggerFactory; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestParam; 
import org.springframework.web.bind.annotation.RestController; 

@RestController 
public class Controller { 
    protected final Logger log = LoggerFactory.getLogger(getClass()); 

    @Autowired 
    private UserRepository users; 

    @Autowired 
    private ItemRepository items; 

    @RequestMapping("test") 
    public String test() { 
        log.info("Test"); 
        return "OK"; 
    } 

    @RequestMapping("user") 
    public User getUser(@RequestParam("id") long id) { 
        log.info("Get user"); 
        return users.getUser(id); 
    } 

    @RequestMapping("item") 
    public Item getItem(@RequestParam("id") long id) { 
        log.info("Get item"); 
        return items.getItem(id); 
    } 

} 

<强> Application.java

package sb; 

import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.EnableAutoConfiguration; 
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration; 
import org.springframework.context.annotation.ComponentScan; 
import org.springframework.context.annotation.Configuration; 

@EnableAutoConfiguration(exclude = DataSourceAutoConfiguration.class) 
@Configuration 
@ComponentScan(basePackages = "sb") 
public class Application { 

    public static void main(String[] args) throws Throwable { 
        SpringApplication app = new SpringApplication(Application.class); 
        app.run(); 
    } 
} 

Answer 2

这是你在spring xml文件上设置多个数据源的方法，这里是我的例子，希望有所帮助

<bean id="dataSource"
      class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url"
              value="jdbc:mysql://localhost:3306/gl?characterEncoding=UTF-8" />
    <property name="username" value="root" />
    <property name="password" value="2238295" />
</bean>



<bean id="mainDataSource"
      class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url"
              value="jdbc:mysql://localhost:3306/gl_main?characterEncoding=UTF-8" />
    <property name="username" value="root" />
    <property name="password" value="2238295" />
</bean>

<!-- Hibernate 4 SessionFactory Bean definition -->
<bean id="sfAccounting"
      class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="packagesToScan" value="com.gl.domain.accounting" />
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.connection.useUnicode">true</prop>
            <prop key="hibernate.connection.characterEncoding">UTF-8</prop>
            <prop key="hibernate.connection.charSet">UTF-8</prop>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect
            </prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.show_sql">false</prop>
        </props>
    </property>
</bean>



<!-- Hibernate 4 SessionFactory Bean definition -->
<bean id="sfCommon"
      class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="mainDataSource" />
    <property name="packagesToScan" value="com.gl.domain.common" />
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.connection.useUnicode">true</prop>
            <prop key="hibernate.connection.characterEncoding">UTF-8</prop>
            <prop key="hibernate.connection.charSet">UTF-8</prop>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect
            </prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.show_sql">false</prop>
        </props>
    </property>
</bean>



<tx:annotation-driven transaction-manager="txnManagerAccounting"/>
<tx:annotation-driven transaction-manager="txnManagerCommon"/>

<bean id="txnManagerAccounting"
      class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sfAccounting" />

</bean>


<bean id="txnManagerCommon"
      class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sfCommon" />

</bean>

<bean id="persistenceExceptionTranslationPostProcessor"
      class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />

Answer 3

您还可以尝试定义多个数据源＆amp;将其中一个指定为主要。

这是演示代码。

主数据源：

@MapperScan(basePackages = "com.demo.mysqldao",
sqlSessionFactoryRef = "mysqlSqlSessionFactory")
@Configuration
public class MysqlDatabaseConfig {

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

  @Value("${mysql.datasource.username}")
  String jdbcUser;

  @Value("${mysql.datasource.password}")
  String jdbcPass;

  @Value("${mysql.datasource.driverClassName}")
  String jdbcProvider;

  BasicDataSource src = null;

  Logger log = LoggerFactory.getLogger(MysqlDatabaseConfig.class);

  @Bean(name = "mysqlDataSource")
  @Primary
  @PostConstruct
  public DataSource mysqlDataSource() {
    if (jdbcUrl == null) {
      throw new RuntimeException("initialization datasource error with null jdbcUrl");
    }
    log.info("Using JDBC ------------> " + jdbcUrl);
    if (src == null) {
      BasicDataSource dataSource = new BasicDataSource();
      dataSource.setDriverClassName(jdbcProvider);
      dataSource.setUrl(jdbcUrl);
      dataSource.setUsername(jdbcUser);
      dataSource.setPassword(jdbcPass);
      dataSource.setMaxActive(100);
      dataSource.setMinIdle(3);
      dataSource.setMaxIdle(10);
      dataSource.setMinEvictableIdleTimeMillis(60 * 1000);
      dataSource.setNumTestsPerEvictionRun(100);
      dataSource.setRemoveAbandoned(true);
      dataSource.setRemoveAbandonedTimeout(60 * 1000);
      dataSource.setTestOnBorrow(true);
      dataSource.setTestOnReturn(true);
      dataSource.setTestWhileIdle(true);
      dataSource.setTimeBetweenEvictionRunsMillis(30 * 60 * 1000);
      src = dataSource;
    }
    return src;
  }

  @Autowired
  @Qualifier(value = "mysqlDataSource")
  DataSource mysqlDataSource;

  @Bean("mysqlTransactionManager")
  @Primary
  public DataSourceTransactionManager mysqlTransactionManager() {
    return new DataSourceTransactionManager(mysqlDataSource);
  }

  @Bean("mysqlSqlSessionFactory")
  @Primary
  public SqlSessionFactory mysqlSqlSessionFactory() throws Exception {
    SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
    sessionFactory.setDataSource(mysqlDataSource);
    return sessionFactory.getObject();
  }

另一个数据源（在我的演示中，它的sqlserver）

@MapperScan(basePackages = "com.demo.sqlserverdao",
sqlSessionFactoryRef = "sqlserverSqlSessionFactory")
@Configuration
public class SQLServerDatabaseConfig {

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

  @Value("${sqlserver.datasource.username}")
  String jdbcUser;

  @Value("${sqlserver.datasource.password}")
  String jdbcPass;

  @Value("${sqlserver.datasource.driverClassName}")
  String jdbcProvider;


  BasicDataSource src = null;

  @Bean(name = "sqlServerDataSource")
  @PostConstruct
  public DataSource sqlServerDataSource() {

    if (jdbcUrl == null) {
      throw new RuntimeException("initialization sqlserver datasource error with null jdbcUrl");
    }
    if (src == null) {
      BasicDataSource dataSource = new BasicDataSource();
      dataSource.setDriverClassName(jdbcProvider);
      dataSource.setUrl(jdbcUrl);
      dataSource.setUsername(jdbcUser);
      dataSource.setPassword(jdbcPass);
      dataSource.setMaxActive(100);
      dataSource.setMinIdle(3);
      dataSource.setMaxIdle(10);
      dataSource.setMinEvictableIdleTimeMillis(60 * 1000);
      dataSource.setNumTestsPerEvictionRun(100);
      dataSource.setRemoveAbandoned(true);
      dataSource.setRemoveAbandonedTimeout(60 * 1000);
      dataSource.setTestOnBorrow(true);
      dataSource.setTestOnReturn(true);
      dataSource.setTestWhileIdle(true);
      dataSource.setTimeBetweenEvictionRunsMillis(30 * 60 * 1000);
      src = dataSource;
    }
    return src;
  }

  @Autowired
  @Qualifier(value = "sqlServerDataSource")
  DataSource sqlServerDataSource;

  @Bean("sqlserverTransactionManager")
  public DataSourceTransactionManager sqlserverTransactionManager() {
    return new DataSourceTransactionManager(sqlServerDataSource);
  }

  @Bean("sqlserverSqlSessionFactory")
  public SqlSessionFactory sqlserverSqlSessionFactory() throws Exception {
    SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
    sessionFactory.setDataSource(sqlServerDataSource);
    return sessionFactory.getObject();
  }

价：https://stackoverflow.com/a/27679997/6037575

Answer 4

我提供了另一个版本，该版本仅适用于Java类和注释。我必须连接到postgresql数据库和mysql数据库。

这是我的RootConfiguration类，在其中定义了数据源和SessionFactories

@Configuration
@ComponentScan(basePackages="com.netzwerge.nzadmin")
@EnableTransactionManagement
public class RootConfiguration {

  @Autowired
  ServletContext context;

  @Bean
  @Qualifier(value="postgre")
  public HibernateTransactionManager txManagerPostgre() {
      HibernateTransactionManager txManager = new HibernateTransactionManager();
      txManager.setSessionFactory(sessionFactoryPostgre().getObject());

      return txManager;
  }

  @Bean
  @Qualifier(value="postgre")
  public LocalSessionFactoryBean sessionFactoryProvab() {
      LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();

      Properties hibernateProperties = new Properties();
      hibernateProperties.setProperty("hibernate.show_sql", "false");
      hibernateProperties.setProperty("hibernate.format_sql", "true");
      hibernateProperties.setProperty("hibernate.current_session_context_class", "org.springframework.orm.hibernate5.SpringSessionContext");
      hibernateProperties.setProperty("hibernate.dialect", "org.hibernate.dialect.PostgreSQL95Dialect");
      hibernateProperties.setProperty("hibernate.connection.datasource", "java:comp/env/jdbc/postgres");
      sessionFactory.setHibernateProperties(hibernateProperties);

      sessionFactory.setPackagesToScan("com.programname.model");
      sessionFactory.setDataSource(dataSourcePostgre());

      return sessionFactory;
  }

  @Bean
  public DataSource dataSourcePostgre() {
      JndiObjectFactoryBean dataSource = new JndiObjectFactoryBean();
      dataSource.setJndiName("java:comp/env/jdbc/postgres");
      dataSource.setResourceRef(true);

      return (DataSource) dataSource.getObject();
  }



  @Bean
  @Qualifier(value="mysql")
  public HibernateTransactionManager txManagerMySql() {
      HibernateTransactionManager txManager = new HibernateTransactionManager();
      txManager.setSessionFactory(sessionFactoryMysql().getObject());

      return txManager;
  }

  @Bean
  @Qualifier(value="mysql")
  public LocalSessionFactoryBean sessionFactorySystemdaten() {
      LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();

      Properties hibernateProperties = new Properties();
      hibernateProperties.setProperty("hibernate.show_sql", "false");
      hibernateProperties.setProperty("hibernate.format_sql", "true");
      hibernateProperties.setProperty("hibernate.current_session_context_class", "org.springframework.orm.hibernate5.SpringSessionContext");
      hibernateProperties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect");
      hibernateProperties.setProperty("hibernate.connection.datasource", "java:comp/env/jdbc/mysql");
      sessionFactory.setHibernateProperties(hibernateProperties);

      sessionFactory.setPackagesToScan("com.programname.model");
      sessionFactory.setDataSource(dataSourceSystemdaten());

      return sessionFactory;
  }

  @Bean
  public DataSource dataSourceMysql() {
      JndiObjectFactoryBean dataSource = new JndiObjectFactoryBean();
      dataSource.setJndiName("java:comp/env/jdbc/mysql");
      dataSource.setResourceRef(true);

      return (DataSource) dataSource.getObject();
  }

  // Other definitions etc.
}

这是在DAO中访问不同数据库的方式。选择访问正确数据库所需的限定符，并选择正确的事务管理器。就我而言，我在两种情况下都使用休眠模式，但是您可以随意使用任何适合您的方式。

@Repository
@Transactional("mysql")
public class CustomerDaoImplMySql implements CustomerDao {


  @Autowired
  @Qualifier("mysql")
  private SessionFactory sessionFactory;

  // The Routines to access the data like CRUD go here

}