SpringMVC4+MyBatis+SQL Server2014实现读写分离
前言
基于mybatis的AbstractRoutingDataSource和Interceptor用拦截器的方式实现读写分离,根据MappedStatement的boundsql,查询sql的select、insert、update、delete,根据起判断使用读写连接串。
开发环境
SpringMVC4、mybatis3
项目结构
读写分离实现
1、pom.xml
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.3.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.3.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.3.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.3.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.3.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity</artifactId>
<version>1.6.2</version>
</dependency>
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity-tools</artifactId>
<version>2.0</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.2</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.0</version>
</dependency>
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>sqljdbc4</artifactId>
<version>4.0</version>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency> <dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.25</version>
</dependency>
</dependencies>
2、jdbc.properties
sqlserver.driver=com.microsoft.sqlserver.jdbc.SQLServerDriver
sqlserver.url=jdbc:sqlserver://127.0.0.1:1433;databaseName=test sqlserver.read.username=sa
sqlserver.read.password=000000 sqlserver.writer.username=sa
sqlserver.writer.password=000000
3、springmvc-serlvet.xml,主要配置都在这里
<?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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
"> <!--从配置文件加载数据库信息-->
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations" value="classpath:config/jdbc.properties"/>
<property name="fileEncoding" value="UTF-8"/>
</bean> <!--配置数据源,这里使用Spring默认-->
<bean id="abstractDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${sqlserver.driver}"/>
<property name="url" value="${sqlserver.url}"/>
</bean> <!--读-->
<bean id="shawnTimeDataSourceRead" parent="abstractDataSource">
<property name="username" value="${sqlserver.read.username}"/>
<property name="password" value="${sqlserver.read.password}"/>
</bean> <!--写-->
<bean id="shawnTimeDataSourceWiter" parent="abstractDataSource">
<property name="username" value="${sqlserver.writer.username}"/>
<property name="password" value="${sqlserver.writer.password}"/>
</bean> <bean id="shawnTimeDataSource" class="com.autohome.rwdb.DynamicDataSource">
<property name="readDataSource" ref="shawnTimeDataSourceRead"/>
<property name="writeDataSource" ref="shawnTimeDataSourceRead"/>
</bean> <bean id="shawnTimeTransactionManager" class="com.autohome.rwdb.DynamicDataSourceTransactionManager">
<property name="dataSource" ref="shawnTimeDataSource"/>
</bean> <!--配置sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:springmvc-mybatis.xml"/>
<property name="dataSource" ref="shawnTimeDataSource"/>
<property name="plugins">
<array>
<bean class="com.autohome.rwdb.DynamicPlugin"/>
</array>
</property>
</bean> <!--扫描Mapper-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.autohome.dao"/>
</bean> <!--启用最新的注解器、映射器-->
<mvc:annotation-driven/> <context:component-scan base-package="com.autohome.*"/> <!--jsp视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"/>
<property name="suffix" value=".jsp"/>
</bean> </beans>
4、DynamicDataSource。实现AbstractRoutingDataSource
package com.autohome.rwdb; import java.util.HashMap;
import java.util.Map; import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; public class DynamicDataSource extends AbstractRoutingDataSource { private Object writeDataSource; //写数据源 private Object readDataSource; //读数据源 @Override
public void afterPropertiesSet() {
if (this.writeDataSource == null) {
throw new IllegalArgumentException("Property 'writeDataSource' is required");
}
setDefaultTargetDataSource(writeDataSource);
Map<Object, Object> targetDataSources = new HashMap<Object, Object>();
targetDataSources.put(DynamicDataSourceGlobal.WRITE.name(), writeDataSource);
if(readDataSource != null) {
targetDataSources.put(DynamicDataSourceGlobal.READ.name(), readDataSource);
}
setTargetDataSources(targetDataSources);
super.afterPropertiesSet();
} @Override
protected Object determineCurrentLookupKey() { DynamicDataSourceGlobal dynamicDataSourceGlobal = DynamicDataSourceHolder.getDataSource(); if(dynamicDataSourceGlobal == null
|| dynamicDataSourceGlobal == DynamicDataSourceGlobal.WRITE) {
return DynamicDataSourceGlobal.WRITE.name();
} return DynamicDataSourceGlobal.READ.name();
} public void setWriteDataSource(Object writeDataSource) {
this.writeDataSource = writeDataSource;
} public Object getWriteDataSource() {
return writeDataSource;
} public Object getReadDataSource() {
return readDataSource;
} public void setReadDataSource(Object readDataSource) {
this.readDataSource = readDataSource;
}
}
5、DynamicDataSourceGlobal
package com.autohome.rwdb; public enum DynamicDataSourceGlobal {
READ, WRITE;
}
6、DynamicDataSourceHolder
package com.autohome.rwdb; public final class DynamicDataSourceHolder { private static final ThreadLocal<DynamicDataSourceGlobal> holder = new ThreadLocal<DynamicDataSourceGlobal>(); private DynamicDataSourceHolder() {
//
} public static void putDataSource(DynamicDataSourceGlobal dataSource){
holder.set(dataSource);
} public static DynamicDataSourceGlobal getDataSource(){
return holder.get();
} public static void clearDataSource() {
holder.remove();
} }
7、DynamicDataSourceTransactionManager
package com.autohome.rwdb; import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.TransactionDefinition; public class DynamicDataSourceTransactionManager extends DataSourceTransactionManager { /**
* 只读事务到读库,读写事务到写库
* @param transaction
* @param definition
*/
@Override
protected void doBegin(Object transaction, TransactionDefinition definition) { //设置数据源
boolean readOnly = definition.isReadOnly();
if(readOnly) {
DynamicDataSourceHolder.putDataSource(DynamicDataSourceGlobal.READ);
} else {
DynamicDataSourceHolder.putDataSource(DynamicDataSourceGlobal.WRITE);
}
super.doBegin(transaction, definition);
} /**
* 清理本地线程的数据源
* @param transaction
*/
@Override
protected void doCleanupAfterCompletion(Object transaction) {
super.doCleanupAfterCompletion(transaction);
DynamicDataSourceHolder.clearDataSource();
}
}
8、DynamicPlugin
package com.autohome.rwdb; import java.util.Locale;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.executor.keygen.SelectKeyGenerator;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.plugin.*;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.transaction.support.TransactionSynchronizationManager; @Intercepts({
@Signature(type = Executor.class, method = "update", args = {
MappedStatement.class, Object.class }),
@Signature(type = Executor.class, method = "query", args = {
MappedStatement.class, Object.class, RowBounds.class,
ResultHandler.class }) })
public class DynamicPlugin implements Interceptor { protected static final Logger logger = LoggerFactory.getLogger(DynamicPlugin.class); private static final String REGEX = ".*insert\\u0020.*|.*delete\\u0020.*|.*update\\u0020.*"; private static final Map<String, DynamicDataSourceGlobal> cacheMap = new ConcurrentHashMap<String, DynamicDataSourceGlobal>(); @Override
public Object intercept(Invocation invocation) throws Throwable { boolean synchronizationActive = TransactionSynchronizationManager.isSynchronizationActive();
if(!synchronizationActive) {
Object[] objects = invocation.getArgs();
MappedStatement ms = (MappedStatement) objects[0]; DynamicDataSourceGlobal dynamicDataSourceGlobal = null; if((dynamicDataSourceGlobal = cacheMap.get(ms.getId())) == null) {
//读方法
if(ms.getSqlCommandType().equals(SqlCommandType.SELECT)) {
//!selectKey 为自增id查询主键(SELECT LAST_INSERT_ID() )方法,使用主库
if(ms.getId().contains(SelectKeyGenerator.SELECT_KEY_SUFFIX)) {
dynamicDataSourceGlobal = DynamicDataSourceGlobal.WRITE;
} else {
BoundSql boundSql = ms.getSqlSource().getBoundSql(objects[1]);
//获取MappedStatement 的sql语句,select update delete insert
String sql = boundSql.getSql().toLowerCase(Locale.CHINA).replaceAll("[\\t\\n\\r]", " "); if(sql.matches(REGEX)) {
dynamicDataSourceGlobal = DynamicDataSourceGlobal.WRITE;
} else {
dynamicDataSourceGlobal = DynamicDataSourceGlobal.READ;
}
}
}else{
dynamicDataSourceGlobal = DynamicDataSourceGlobal.WRITE;
}
System.out.println("设置方法["+ms.getId()+"] use ["+ dynamicDataSourceGlobal.name()+"] Strategy, SqlCommandType ["+ms.getSqlCommandType().name()+"]..");
cacheMap.put(ms.getId(), dynamicDataSourceGlobal);
}
DynamicDataSourceHolder.putDataSource(dynamicDataSourceGlobal);
} return invocation.proceed();
} @Override
public Object plugin(Object target) {
if (target instanceof Executor) {
return Plugin.wrap(target, this);
} else {
return target;
}
} @Override
public void setProperties(Properties properties) { }
}
测试分离是否实现
运行UserController.index方法,然后从控制台看打印结果
参考
https://github.com/shawntime/shawn-rwdb
http://www.jianshu.com/p/2222257f96d3
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