Home > Java > javaTutorial > body text

How to configure dual data sources in MVC in Spring to realize a Java project connecting to two databases at the same time

黄舟
Release: 2018-05-17 13:41:52
Original
2962 people have browsed it

This article mainly introduces you to the relevant information about Spring MVCHow to configure dual data sources to implement a java project to connect two databases at the same time. The article introduces it in detail through sample code, which is of great help to everyone. It has certain reference and learning value. Friends who need it can take a look below.

Preface

This article mainly introduces the method of configuring dual data sources with Spring MVC to realize a java project connecting two databases at the same time. Share Come out for your reference and study. Let’s take a look at the detailed introduction:

Implementation method:

The data source is in Configuration in configuration file

<pre name="code" class="java"><?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" 
 xmlns:cache="http://www.springframework.org/schema/cache" 
 xmlns:context="http://www.springframework.org/schema/context" 
 xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee" 
 xmlns:jms="http://www.springframework.org/schema/jms" xmlns:lang="http://www.springframework.org/schema/lang" 
 xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:oxm="http://www.springframework.org/schema/oxm" 
 xmlns:p="http://www.springframework.org/schema/p" xmlns:task="http://www.springframework.org/schema/task" 
 xmlns:tx="http://www.springframework.org/schema/tx" xmlns:util="http://www.springframework.org/schema/util" 
 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 
 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd 
 http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-3.1.xsd 
 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd 
 http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd 
 http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd 
 http://www.springframework.org/schema/jms http://www.springframework.org/schema/jms/spring-jms-3.1.xsd 
 http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-3.1.xsd 
 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd 
 http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm-3.1.xsd 
 http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.1.xsd 
 http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd 
 http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd"> 
 
 <context:annotation-config /> 
 
 <context:component-scan base-package="com"></context:component-scan> 
 
 <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 
  <property name="locations"> 
   <list> 
    <value>classpath:com/resource/config.properties</value> 
   </list> 
  </property> 
 </bean> 
 
 <bean id="dataSourceOne" class="com.mchange.v2.c3p0.ComboPooledDataSource" 
  destroy-method="close"> 
  <property name="driverClass" value="${dbOne.jdbc.driverClass}" /> 
  <property name="jdbcUrl" value="${dbOne.jdbc.url}" /> 
  <property name="user" value="${dbOne.jdbc.user}" /> 
  <property name="password" value="${dbOne.jdbc.password}" /> 
  <property name="initialPoolSize" value="${dbOne.jdbc.initialPoolSize}" /> 
  <property name="minPoolSize" value="${dbOne.jdbc.minPoolSize}" /> 
  <property name="maxPoolSize" value="${dbOne.jdbc.maxPoolSize}" /> 
 </bean> 
 
 <bean id="dataSourceTwo" class="com.mchange.v2.c3p0.ComboPooledDataSource" 
  destroy-method="close"> 
  <property name="driverClass" value="${dbTwo.jdbc.driverClass}" /> 
  <property name="jdbcUrl" value="${dbTwo.jdbc.url}" /> 
  <property name="user" value="${dbTwo.jdbc.user}" /> 
  <property name="password" value="${dbTwo.jdbc.password}" /> 
  <property name="initialPoolSize" value="${dbTwo.jdbc.initialPoolSize}" /> 
  <property name="minPoolSize" value="${dbTwo.jdbc.minPoolSize}" /> 
  <property name="maxPoolSize" value="${dbTwo.jdbc.maxPoolSize}" /> 
 </bean> 
 
 <bean id="dynamicDataSource" class="com.core.DynamicDataSource"> 
  <property name="targetDataSources"> 
   <map key-type="java.lang.String"> 
    <entry value-ref="dataSourceOne" key="dataSourceOne"></entry> 
    <entry value-ref="dataSourceTwo" key="dataSourceTwo"></entry> 
   </map> 
  </property> 
  <property name="defaultTargetDataSource" ref="dataSourceOne"> 
  </property> 
 </bean> 
 
 <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> 
  <property name="dataSource" ref="dynamicDataSource" /> 
  <property name="hibernateProperties"> 
   <props> 
    <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop> 
    <prop key="hibernate.current_session_context_class">org.springframework.orm.hibernate4.SpringSessionContext</prop> 
    <prop key="hibernate.show_sql">false</prop> 
    <prop key="hibernate.format_sql">true</prop> 
    <prop key="hbm2ddl.auto">create</prop> 
   </props> 
  </property> 
  <property name="packagesToScan"> 
   <list> 
    <value>com.po</value> 
   </list> 
  </property> 
 </bean> 
 
 <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"> 
  <property name="sessionFactory" ref="sessionFactory" /> 
 </bean> 
 
 <aop:config> 
  <aop:pointcut id="transactionPointCut" expression="execution(* com.dao..*.*(..))" /> 
  <aop:advisor advice-ref="txAdvice" pointcut-ref="transactionPointCut" /> 
 </aop:config> 
 
 <tx:advice id="txAdvice" transaction-manager="transactionManager"> 
  <tx:attributes> 
   <tx:method name="add*" propagation="REQUIRED" /> 
   <tx:method name="save*" propagation="REQUIRED" /> 
   <tx:method name="update*" propagation="REQUIRED" /> 
   <tx:method name="delete*" propagation="REQUIRED" /> 
   <tx:method name="*" read-only="true" /> 
  </tx:attributes> 
 </tx:advice> 
 
 <aop:config> 
  <aop:aspect id="dataSourceAspect" ref="dataSourceInterceptor"> 
   <aop:pointcut id="daoOne" expression="execution(* com.dao.one.*.*(..))" /> 
   <aop:pointcut id="daoTwo" expression="execution(* com.dao.two.*.*(..))" /> 
   <aop:before pointcut-ref="daoOne" method="setdataSourceOne" /> 
   <aop:before pointcut-ref="daoTwo" method="setdataSourceTwo" /> 
  </aop:aspect> 
 </aop:config> 
</beans>
Copy after login

DynamicDataSource.class

package com.core; 
 
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; 
 
public class DynamicDataSource extends AbstractRoutingDataSource{ 
 
 @Override 
 protected Object determineCurrentLookupKey() { 
  return DatabaseContextHolder.getCustomerType(); 
 } 
 
}
Copy after login

DatabaseContextHolder.class sets the class of the data source

package com.core; 
 
public class DatabaseContextHolder { 
 
 private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>(); 
<span style="white-space:pre"> </span>//设置要使用的数据源 
 public static void setCustomerType(String customerType) { 
  contextHolder.set(customerType); 
 } 
<span style="white-space:pre"> </span>//获取数据源 
 public static String getCustomerType() { 
  return contextHolder.get(); 
 } 
<span style="white-space:pre"> </span>//清除数据源,使用默认的数据源 
 public static void clearCustomerType() { 
  contextHolder.remove(); 
 } 
}
Copy after login

DataSourceInterceptor.class

package com.core; 
 
import org.aspectj.lang.JoinPoint; 
import org.springframework.stereotype.Component; 
 
@Component 
public class DataSourceInterceptor { 
<span style="white-space:pre"> </span>//数据源1 
 public static final String SOURCE_PLAN = "<span style="font-family: Arial, Helvetica, sans-serif;">dataSourceOne</span><span style="font-family: Arial, Helvetica, sans-serif;">";</span> 
 //数据源2 
<pre name="code" class="java"><span style="white-space:pre"> </span>public static final String SOURCE_FUND = "<span style="font-family: Arial, Helvetica, sans-serif;">dataSourceTwo</span>"; 
}
Copy after login

springMVC Data Source

jdbc_driverClassName=com.microsoft.sqlserver.jdbc.SQLServerDriver 
<pre name="code" class="java">dataSourceOne<span style="font-family: Arial, Helvetica, sans-serif;">=jdbc:sqlserver://115.29.***.**;DatabaseName=DB_GuiHua</span>
Copy after login

jdbc_username=**jdbc_password=**


dataSourceTwo<span style="font-family: Arial, Helvetica, sans-serif;">=jdbc:sqlserver://115.29.***.*;DatabaseName=DB_Fund</span>
Copy after login

Spring MVC will have a data source by default. When you need to change the data source, you must configure it before calling the transaction

DataSourceContextHolder.setDbType(DataSourceType.SOURCE_FUND);//更换数据源
Copy after login
/** 
 * @ClassName: DataSourceContextHolder 
 * @Description: 数据库切换工具类 
 * @author: wzx 
 * @date: 2016-07-27 上午10:26:01 
 */ 
public class DataSourceContextHolder { 
 private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>(); 
 
 public static void setDbType(String dbType) { 
  contextHolder.set(dbType); 
 } 
 
 public static String getDbType() { 
  return ((String) contextHolder.get()); 
 } 
 
 public static void clearDbType() { 
  contextHolder.remove(); 
 } 
}
Copy after login

Summarize

The above is the detailed content of How to configure dual data sources in MVC in Spring to realize a Java project connecting to two databases at the same time. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!