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>
DynamicDataSource.class
package com.core; import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; public class DynamicDataSource extends AbstractRoutingDataSource{ @Override protected Object determineCurrentLookupKey() { return DatabaseContextHolder.getCustomerType(); } }
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(); } }
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>"; }
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>
jdbc_username=**jdbc_password=**
dataSourceTwo<span style="font-family: Arial, Helvetica, sans-serif;">=jdbc:sqlserver://115.29.***.*;DatabaseName=DB_Fund</span>
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
/** * @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(); } }
Summarize
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