Verwenden mehrerer DataSource mit Spring Boot und RoutingDataSource

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1- Das Zweck des Unterlagen

Manchmal sollen Sie eine Web-Applikation verbindend mit vielen unterchiedlichen Database erstellen. Und Sie können es im Spring Boot einfach machen.
Spring bietet Sie die Klasse  AbstractRoutingDataSource, Sie sollen eine Klasse schreiben, die aus der Klasse ausgeweitert wird. Routing Datasource enthaltet ein Map der echten Datasource.
Note: Routing Datasource is also a Datasource but it is a special one.
Und DataSource Interceptor entscheidet, welche entspechende  DataSource der Anforderung aus dem Benutzer benutzt werden.
Im Dokument bezeichne ich eine Website benutzend 2 datasource. Jede  datasource verbindet mit einer verschiedenen Database. Eine Database speichert die Information für das System  Publisher und eine Database speichert die Information für das System Advertiser 
In einiger Situation können Sie eine MultispracheWebsite machen. Sie können viele Database erstellen. Jede Database speichert den Artikel einer bestimmten Sprache
Wenn Ihre Applikation in einem anderen Fall viel  DataSource brauchen und jede Funktion (jede Seite) kann mit vielen  DataSource gleichzeitig arbeiten, brauchen Sie die folgenden Anleitungen lernen:

2- Die Database vorbereiten

Ich werde 2 Database erstellen. Eine Database ist für das System PUBLISHER  und eine Database für das System ADVERTISER . 2 Database können die gleichen Typ sein. Sie können   Oracle, MySQL oder  SQL Server, ... benutzen

Database1:

Das DB System vom PUBLISHER hat eine Tabelle Publishers.
Database1 - (MySQL, SQL Server, PostGres)
-- ===========================================
-- DATABASE FOR PUBLISHER SYSTEM
-- ===========================================
create table PUBLISHERS
(
  ID Bigint,
  NAME VARCHAR(255),
  Primary key (ID)
);

insert into publishers (ID, NAME)
values (1, 'publisher 1');

insert into publishers (ID, NAME)
values (2, 'publisher 2');
Database1 - (ORACLE)
-- ===========================================
-- DATABASE FOR PUBLISHER SYSTEM
-- ===========================================
create table PUBLISHERS
(
  ID NUMBER(19),
  NAME VARCHAR(255),
  Primary key (ID)
);

insert into publishers (ID, NAME)
values (1, 'publisher 1');

insert into publishers (ID, NAME)
values (2, 'publisher 2');

Commit;

Database 2:

Das DB System vom   ADVERTISER hat eine Tabelle Advertisers.

Database2 (MySQL, SQL Server, PostGres)
-- ===========================================
-- DATABASE FOR ADVERTISER SYSTEM
-- ===========================================
create table ADVERTISERS
(
  ID Bigint,
  NAME VARCHAR(255),
  Primary key (ID)
);

insert into advertisers (ID, NAME)
values (1, 'Advertiser 1');

insert into advertisers (ID, NAME)
values (2, 'Advertiser 2');
Database2 - (ORACLE)
-- ===========================================
-- DATABASE FOR ADVERTISER SYSTEM
-- ===========================================
create table ADVERTISERS
(
  ID NUMBER(19),
  NAME VARCHAR(255),
  Primary key (ID)
);

insert into advertisers (ID, NAME)
values (1, 'Advertiser 1');

insert into advertisers (ID, NAME)
values (2, 'Advertiser 2');

Commit;

3- Die Konfiguration von DataSource & RoutingDataSource

Die Information von Database wird in die File datasource-cfg.properties konfiguriert
datasource-cfg.properties (MySQL + MySQL)

# DataSource (PUBLISHER System).

spring.datasource.driver-class-name.1=com.mysql.jdbc.Driver
spring.datasource.url.1=jdbc:mysql://localhost:3306/publisher
spring.datasource.username.1=root
spring.datasource.password.1=12345



# DataSource (ADVERTISER System).

spring.datasource.driver-class-name.2=com.mysql.jdbc.Driver
spring.datasource.url.2=jdbc:mysql://localhost:3306/advertiser
spring.datasource.username.2=root
spring.datasource.password.2=12345
datasource-cfg.properties (SQL Server + SQL Server) (JTDS Driver)

# DataSource  (PUBLISHER System).

spring.datasource.driver-class-name.1=net.sourceforge.jtds.jdbc.Driver
spring.datasource.url.1=jdbc:jtds:sqlserver://localhost:1433/publisher;instance=SQLEXPRESS
spring.datasource.username.1=sa
spring.datasource.password.1=12345


# DataSource  (ADVERTISER System).

spring.datasource.driver-class-name.2=net.sourceforge.jtds.jdbc.Driver
spring.datasource.url.2=jdbc:jtds:sqlserver://localhost:1433/advertiser;instance=SQLEXPRESS
spring.datasource.username.2=sa
spring.datasource.password.2=12345
datasource-cfg.properties (SQL Server + SQL Server) (Mssql-Jdbc Driver)

# DataSource  (PUBLISHER System).

spring.datasource.driver-class-name.1=com.microsoft.sqlserver.jdbc.SQLServerDriver
spring.datasource.url.1=jdbc:sqlserver://tran-vmware-pc\\SQLEXPRESS:1433;databaseName=publisher
spring.datasource.username.1=sa
spring.datasource.password.1=12345


# DataSource  (ADVERTISER System).

spring.datasource.driver-class-name.2=com.microsoft.sqlserver.jdbc.SQLServerDriver
spring.datasource.url.2=jdbc:sqlserver://tran-vmware-pc\\SQLEXPRESS:1433;databaseName=advertiser
spring.datasource.username.2=sa
spring.datasource.password.2=12345
datasource-cfg.properties (ORACLE + ORACLE)


# DataSource (PUBLISHER System).

spring.datasource.driver-class-name.1=oracle.jdbc.driver.OracleDriver
spring.datasource.url.1=jdbc:oracle:thin:@localhost:1521:db12c
spring.datasource.username.1=publisher
spring.datasource.password.1=12345


# DataSource (ADVERTISER System).

spring.datasource.driver-class-name.2=oracle.jdbc.driver.OracleDriver
spring.datasource.url.2=jdbc:oracle:thin:@localhost:1521:db12c
spring.datasource.username.2=advertiser
spring.datasource.password.2=12345
datasource-cfg.properties (PostGres + PostGres)

# DataSource (PUBLISHER System).

spring.datasource.driver-class-name.1=org.postgresql.Driver
spring.datasource.url.1=jdbc:postgresql://tran-vmware-pc:5432/publisher
spring.datasource.username.1=postgres
spring.datasource.password.1=12345



# DataSource (ADVERTISER System).

spring.datasource.driver-class-name.2=org.postgresql.Driver
spring.datasource.url.2=jdbc:postgresql://tran-vmware-pc:5432/advertiser
spring.datasource.username.2=postgres
spring.datasource.password.2=12345
 
Nach dem Standard wird  Spring Boot eine  DataSource konfigurieren,deshalb sollen Sie es deaktivieren damit es Ihre  DataSource konfigurieren kann. Die automatischen Konfigurationen schließt ein:
  1. DataSourceAutoConfiguration
  2. DataSourceTransactionManagerAutoConfiguration
SpringBootRoutingDsApplication.java
package org.o7planning.sbroutingds;

import java.sql.SQLException;

import javax.sql.DataSource;

import org.o7planning.sbroutingds.routing.MyRoutingDataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.PropertySource;
import org.springframework.context.annotation.PropertySources;
import org.springframework.core.env.Environment;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.jdbc.datasource.DriverManagerDataSource;

@SpringBootApplication

// Disable Auto Config DataSource & DataSourceTransactionManager
@EnableAutoConfiguration(exclude = { //
		DataSourceAutoConfiguration.class, //
		DataSourceTransactionManagerAutoConfiguration.class })

// Load to Environment
// (@see resources/datasource-cfg.properties).
@PropertySources({ @PropertySource("classpath:datasource-cfg.properties") })
public class SpringBootRoutingDsApplication {

	// Stores all the properties loaded by the @PropertySource
	@Autowired
	private Environment env;

	public static void main(String[] args) {
		SpringApplication.run(SpringBootRoutingDsApplication.class, args);
	}

	// Returns Routing DataSource (MyRoutingDataSource)
	@Autowired
	@Bean(name = "dataSource")
	public DataSource getDataSource(DataSource dataSource1, DataSource dataSource2) {

		System.out.println("## Create DataSource from dataSource1 & dataSource2");

		MyRoutingDataSource dataSource = new MyRoutingDataSource();

		dataSource.initDataSources(dataSource1, dataSource2);

		return dataSource;
	}

	@Bean(name = "dataSource1")
	public DataSource getDataSource1() throws SQLException {
		DriverManagerDataSource dataSource = new DriverManagerDataSource();

		// See: datasouce-cfg.properties
		dataSource.setDriverClassName(env.getProperty("spring.datasource.driver-class-name.1"));
		dataSource.setUrl(env.getProperty("spring.datasource.url.1"));
		dataSource.setUsername(env.getProperty("spring.datasource.username.1"));
		dataSource.setPassword(env.getProperty("spring.datasource.password.1"));

		System.out.println("## DataSource1: " + dataSource);
		return dataSource;
	}

	@Bean(name = "dataSource2")
	public DataSource getDataSource2() throws SQLException {
		DriverManagerDataSource dataSource = new DriverManagerDataSource();

		// See: datasouce-cfg.properties
		dataSource.setDriverClassName(env.getProperty("spring.datasource.driver-class-name.2"));
		dataSource.setUrl(env.getProperty("spring.datasource.url.2"));
		dataSource.setUsername(env.getProperty("spring.datasource.username.2"));
		dataSource.setPassword(env.getProperty("spring.datasource.password.2"));

		System.out.println("## DataSource2: " + dataSource);

		return dataSource;
	}

	@Autowired
	@Bean(name = "transactionManager")
	public DataSourceTransactionManager getTransactionManager(DataSource dataSource) {
		DataSourceTransactionManager txManager = new DataSourceTransactionManager();

		txManager.setDataSource(dataSource);

		return txManager;
	}

}
MyRoutingDataSource íst eine  DataSource, die ein Map zwischen die Schlüssel und die echtlichen Datasource enthaltet.
MyRoutingDataSource.java
package org.o7planning.sbroutingds.routing;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.sql.DataSource;

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

// This is a DataSource.
public class MyRoutingDataSource extends AbstractRoutingDataSource {

   @Override
   protected Object determineCurrentLookupKey() {

      HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes())
            .getRequest();

      // See more: DataSourceInterceptor
      String keyDS = (String) request.getAttribute("keyDS");

      System.out.println("KeyDS=" + keyDS);

      if (keyDS == null) {
         keyDS = "PUBLISHER_DS";
      }

      return keyDS;
   }

   public void initDataSources(DataSource dataSource1, DataSource dataSource2) {
      Map<Object, Object> dsMap = new HashMap<Object, Object>();
      dsMap.put("PUBLISHER_DS", dataSource1);
      dsMap.put("ADVERTISER_DS", dataSource2);

      this.setTargetDataSources(dsMap);
   }

}

4- DataSourceInterceptor & die Konfiguration

DataSourceInterceptor wird   URL vom Request analysieren und entscheidet, welche D atasource verwendet wird.
DataSourceIntercetor.java
package org.o7planning.sbroutingds.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class DataSourceIntercetor extends HandlerInterceptorAdapter {

    // Request:

    // /publisher/list
    // /advertiser/list
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {

        String contextPath = request.getServletContext().getContextPath();

        // /SomeContextPath/publisher
        String prefixPublisher = contextPath + "/publisher";
        
        // /SomeContextPath/advertiser
        String prefixAdvertiser = contextPath + "/advertiser";

        // /SomeContextPath/publisher/dashboard
        // /SomeContextPath/advertiser/dashboard
        
        String uri = request.getRequestURI();
        System.out.println("URI:"+ uri);
        
        if(uri.startsWith(prefixPublisher)) {
            request.setAttribute("keyDS", "PUBLISHER_DS");
        }
        
        else if(uri.startsWith(prefixAdvertiser)) {
            request.setAttribute("keyDS", "ADVERTISER_DS");
        }

        return true;
    }

}
Im  WebMvcConfig sollen Sie  DataSourceInterceptor registrieren.
WebMvcConfig.java
package org.o7planning.sbroutingds.config;

import org.o7planning.sbroutingds.interceptor.DataSourceIntercetor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {

        registry.addInterceptor(new DataSourceIntercetor())//
                .addPathPatterns("/publisher/*", "/advertiser/*");
    }

}

5- DAO, Controller

DataDAO ist eine Utility Klasse, die die Daten aus der Database abfragen
DataDAO.java
package org.o7planning.sbroutingds.dao;

import java.util.List;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

@Repository
@Transactional
public class DataDAO extends JdbcDaoSupport {

    @Autowired
    public DataDAO(DataSource dataSource) {
        this.setDataSource(dataSource);
    }

    public List<String> queryPublishers() {
        String sql = "Select name from Publishers";

        List<String> list = this.getJdbcTemplate().queryForList(sql, String.class);
        return list;
    }

    public List<String> queryAdvertisers() {
        String sql = "Select name from Advertisers";

        List<String> list = this.getJdbcTemplate().queryForList(sql, String.class);
        return list;
    }
    
}
MainController.java
package org.o7planning.sbroutingds.controller;

import java.sql.SQLException;
import java.util.List;

import org.o7planning.sbroutingds.dao.DataDAO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class MainController {

    @Autowired
    private DataDAO dataDAO;
    
    
    @RequestMapping(value = { "/" }, method = RequestMethod.GET)
    public String home(Model model) throws SQLException {
 
        return "home";
    }

    @RequestMapping(value = { "/advertiser/list" }, method = RequestMethod.GET)
    public String advertiser(Model model) throws SQLException {

        List<String> list = dataDAO.queryAdvertisers();
        model.addAttribute("advertisers", list);

        return "advertiser";
    }

    @RequestMapping(value = { "/publisher/list" }, method = RequestMethod.GET)
    public String publisher(Model model) throws SQLException {

        List<String> list = dataDAO.queryPublishers();
        model.addAttribute("publishers", list);

        return "publisher";
    }

}

6- Thymeleaf Template

home.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
   <head>
      <meta charset="UTF-8"/>
      <title>Home</title>
   </head>
   <body>
   
      <h2>Multi DataSource with RoutingDataSource</h2>
      
      <h3>/publisher/* ==> Using Publisher-DB</h3>
      <ul>
         <li><a th:href="@{/publisher/list}">Show Publisher List</a></li>
      </ul>
      
      <h3>/advertiser/* ==> Using Advertiser-DB</h3>
      <ul>
         <li> <a th:href="@{/advertiser/list}">Show Advertiser Lists</a>   </li>
      </ul>
      
   </body>
   
</html>
publisher.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
   <head>
      <meta charset="UTF-8"/>
      <title>Publisher System</title>
   </head>
  
   <body>
      <a th:href="@{/}">Home</a>
      
      <h2>Using Publisher-DB</h2>
      
      <ul>
         <li th:each="publisher : ${publishers}" th:utext="${publisher}"></li>
      </ul>
   </body>
  
</html>
advertiser.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
   <head>
      <meta charset="UTF-8"/>
      <title>Advertiser System</title>
   </head>
   <body>
      <a th:href="@{/}">Home</a>
      
      <h2>Using Advertiser-DB</h2>
      
      <ul>
         <li th:each="advertiser : ${advertisers}" th:utext="${advertiser}"></li>
      </ul>
      
   </body>
   
</html>

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