"最近用到了 MyBatis 配置多数据源，原以为简单配置下就行了，实际操作后发现还是要费些事的，这里记录下，以作备忘不多废话，直接上代码，后面会有简单的实现介绍 jdbc 和 log4j 的配置 [图片][图片] #定义输出格式 ConversionPattern=%d %-5p [%t] %c ...."

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Spring+MyBatis多数据源配置实现

最近用到了 MyBatis 配置多数据源，原以为简单配置下就行了，实际操作后发现还是要费些事的，这里记录下，以作备忘

不多废话，直接上代码，后面会有简单的实现介绍

jdbc 和 log4j 的配置

#定义输出格式
ConversionPattern=%d %-5p [%t] %c - %m%n
log4j.rootLogger=DEBUG,Console
log4j.logger.com.cnblogs.lzrabbit=DEBUG
log4j.logger.org.springframework=ERROR
log4j.logger.org.mybatis=ERROR
log4j.logger.org.apache.ibatis=ERROR
log4j.logger.org.quartz=ERROR
log4j.logger.org.apache.axis2=ERROR
log4j.logger.org.apache.axiom=ERROR
log4j.logger.org.apache=ERROR
log4j.logger.httpclient=ERROR
#log4j.additivity.org.springframework=false
#Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.Threshold=DEBUG
log4j.appender.Console.Target=System.out
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=${ConversionPattern}
#log4j.appender.Console.encoding=UTF-8
#org.apache.log4j.DailyRollingFileAppender
log4j.appender.DailyFile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.DailyFile.DatePattern='.'yyyy-MM-dd'.log'
log4j.appender.DailyFile.File=${myApp.root}/logs/daily.log
log4j.appender.DailyFile.Append=true
log4j.appender.DailyFile.Threshold=DEBUG
log4j.appender.DailyFile.layout=org.apache.log4j.PatternLayout
log4j.appender.DailyFile.layout.ConversionPattern=${ConversionPattern}
log4j.appender.DailyFile.encoding=UTF-8
%c 输出日志信息所属的类的全名
%d 输出日志时间点的日期或时间，默认格式为 ISO8601，也可以在其后指定格式，比如：%d{yyy-MM-dd HH🇲🇲ss}，输出类似：2002-10-18- 22：10：28
%f 输出日志信息所属的类的类名
%l 输出日志事件的发生位置，即输出日志信息的语句处于它所在的类的第几行
%m 输出代码中指定的信息，如 log(message) 中的 message
%n 输出一个回车换行符，Windows 平台为“rn”，Unix 平台为“n”
%p 输出优先级，即 DEBUG，INFO，WARN，ERROR，FATAL。如果是调用 debug() 输出的，则为 DEBUG，依此类推
%r 输出自应用启动到输出该日志信息所耗费的毫秒数
%t 输出产生该日志事件的线程名

log4j.properties

#============================================================================
# MySQL
#============================================================================
jdbc.mysql.driver=com.mysql.jdbc.Driver
jdbc.mysql.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
jdbc.mysql.username=root
jdbc.mysql.password=root
#============================================================================
MS SQL Server
#============================================================================
#jdbc.sqlserver.driver=com.microsoft.sqlserver.jdbc.SQLServerDriver
#jdbc.sqlserver.url=jdbc:sqlserver://127.0.0.1:1433;database=test;
#jdbc.sqlserver.username=sa
#jdbc.sqlserver.password=sa
#============================================================================
MS SQL Server (JTDS)
#============================================================================
jdbc.sqlserver.driver=net.sourceforge.jtds.jdbc.Driver
jdbc.sqlserver.url=jdbc:jtds:sqlserver://127.0.0.1:1433/test
jdbc.sqlserver.username=sa
jdbc.sqlserver.password=sa
#============================================================================
通用配置
#============================================================================
jdbc.initialSize=5
jdbc.minIdle=5
jdbc.maxIdle=20
jdbc.maxActive=100
jdbc.maxWait=100000
jdbc.defaultAutoCommit=false
jdbc.removeAbandoned=true
jdbc.removeAbandonedTimeout=600
jdbc.testWhileIdle=true
jdbc.timeBetweenEvictionRunsMillis=60000
jdbc.numTestsPerEvictionRun=20
jdbc.minEvictableIdleTimeMillis=300000

jdbc.properties

单数据源时的 Spring 配置文件

<?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: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-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
      http://www.springframework.org/schema/aop
          http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties"/>
    </bean>
       <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.mysql.driver}"/>
        <property name="url" value="${jdbc.mysql.url}"/>
        <property name="username" value="${jdbc.mysql.username}"/>
        <property name="password" value="${jdbc.mysql.password}"/>
        <property name="initialSize" value="${jdbc.initialSize}"/>
        <property name="minIdle" value="${jdbc.minIdle}"/>
        <property name="maxIdle" value="${jdbc.maxIdle}"/>
        <property name="maxActive" value="${jdbc.maxActive}"/>
        <property name="maxWait" value="${jdbc.maxWait}"/>
        <property name="defaultAutoCommit" value="${jdbc.defaultAutoCommit}"/>
        <property name="removeAbandoned" value="${jdbc.removeAbandoned}"/>
        <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}"/>
        <property name="testWhileIdle" value="${jdbc.testWhileIdle}"/>
        <property name="timeBetweenEvictionRunsMillis" value="${jdbc.timeBetweenEvictionRunsMillis}"/>
        <property name="numTestsPerEvictionRun" value="${jdbc.numTestsPerEvictionRun}"/>
        <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}"/>
    </bean>
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>
<span style="color: rgba(0, 128, 0, 1)">&lt;!--</span><span style="color: rgba(0, 128, 0, 1)"> mybatis.spring自动映射 </span><span style="color: rgba(0, 128, 0, 1)">--&gt;</span>
<span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">bean </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="org.mybatis.spring.mapper.MapperScannerConfigurer"</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
    <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">property </span><span style="color: rgba(255, 0, 0, 1)">name</span><span style="color: rgba(0, 0, 255, 1)">="basePackage"</span><span style="color: rgba(255, 0, 0, 1)"> value</span><span style="color: rgba(0, 0, 255, 1)">="com.cnblogs.lzrabbit"</span><span style="color: rgba(0, 0, 255, 1)">/&gt;</span>
<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">bean</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>

<span style="color: rgba(0, 128, 0, 1)">&lt;!--</span><span style="color: rgba(0, 128, 0, 1)"> 自动扫描，多个包以 逗号分隔 </span><span style="color: rgba(0, 128, 0, 1)">--&gt;</span>
<span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">context:component-scan </span><span style="color: rgba(255, 0, 0, 1)">base-package</span><span style="color: rgba(0, 0, 255, 1)">="com.cnblogs.lzrabbit"</span><span style="color: rgba(0, 0, 255, 1)">/&gt;</span>
<span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">aop:aspectj-autoproxy</span><span style="color: rgba(0, 0, 255, 1)">/&gt;</span>

</beans>

applicationContext.xml

多数据源时 Spring 配置文件

<?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: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-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
      http://www.springframework.org/schema/aop
          http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties"/>
    </bean>
    <bean id="sqlServerDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.sqlserver.driver}"/>
        <property name="url" value="${jdbc.sqlserver.url}"/>
        <property name="username" value="${jdbc.sqlserver.username}"/>
        <property name="password" value="${jdbc.sqlserver.password}"/>
        <property name="initialSize" value="${jdbc.initialSize}"/>
        <property name="minIdle" value="${jdbc.minIdle}"/>
        <property name="maxIdle" value="${jdbc.maxIdle}"/>
        <property name="maxActive" value="${jdbc.maxActive}"/>
        <property name="maxWait" value="${jdbc.maxWait}"/>
        <property name="defaultAutoCommit" value="${jdbc.defaultAutoCommit}"/>
        <property name="removeAbandoned" value="${jdbc.removeAbandoned}"/>
        <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}"/>
        <property name="testWhileIdle" value="${jdbc.testWhileIdle}"/>
        <property name="timeBetweenEvictionRunsMillis" value="${jdbc.timeBetweenEvictionRunsMillis}"/>
        <property name="numTestsPerEvictionRun" value="${jdbc.numTestsPerEvictionRun}"/>
        <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}"/>
    </bean>
    <bean id="mySqlDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.mysql.driver}"/>
        <property name="url" value="${jdbc.mysql.url}"/>
        <property name="username" value="${jdbc.mysql.username}"/>
        <property name="password" value="${jdbc.mysql.password}"/>
        <property name="initialSize" value="${jdbc.initialSize}"/>
        <property name="minIdle" value="${jdbc.minIdle}"/>
        <property name="maxIdle" value="${jdbc.maxIdle}"/>
        <property name="maxActive" value="${jdbc.maxActive}"/>
        <property name="maxWait" value="${jdbc.maxWait}"/>
        <property name="defaultAutoCommit" value="${jdbc.defaultAutoCommit}"/>
        <property name="removeAbandoned" value="${jdbc.removeAbandoned}"/>
        <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}"/>
        <property name="testWhileIdle" value="${jdbc.testWhileIdle}"/>
        <property name="timeBetweenEvictionRunsMillis" value="${jdbc.timeBetweenEvictionRunsMillis}"/>
        <property name="numTestsPerEvictionRun" value="${jdbc.numTestsPerEvictionRun}"/>
        <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}"/>
    </bean>
    <bean id="multipleDataSource" class="com.cnblogs.lzrabbit.MultipleDataSource">
        <property name="defaultTargetDataSource" ref="mySqlDataSource"/>
        <property name="targetDataSources">
            <map>
                <entry key="mySqlDataSource" value-ref="mySqlDataSource"/>
                <entry key="sqlServerDataSource" value-ref="sqlServerDataSource"/>
            </map>
        </property>
    </bean>
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="multipleDataSource"/>
    </bean>
<span style="color: rgba(0, 128, 0, 1)">&lt;!--</span><span style="color: rgba(0, 128, 0, 1)"> mybatis.spring自动映射 </span><span style="color: rgba(0, 128, 0, 1)">--&gt;</span>
<span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">bean </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="org.mybatis.spring.mapper.MapperScannerConfigurer"</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
    <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">property </span><span style="color: rgba(255, 0, 0, 1)">name</span><span style="color: rgba(0, 0, 255, 1)">="basePackage"</span><span style="color: rgba(255, 0, 0, 1)"> value</span><span style="color: rgba(0, 0, 255, 1)">="com.cnblogs.lzrabbit"</span><span style="color: rgba(0, 0, 255, 1)">/&gt;</span>
<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">bean</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>

<span style="color: rgba(0, 128, 0, 1)">&lt;!--</span><span style="color: rgba(0, 128, 0, 1)"> 自动扫描，多个包以 逗号分隔 </span><span style="color: rgba(0, 128, 0, 1)">--&gt;</span>
<span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">context:component-scan </span><span style="color: rgba(255, 0, 0, 1)">base-package</span><span style="color: rgba(0, 0, 255, 1)">="com.cnblogs.lzrabbit"</span><span style="color: rgba(0, 0, 255, 1)">/&gt;</span>
<span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">aop:aspectj-autoproxy</span><span style="color: rgba(0, 0, 255, 1)">/&gt;</span>

</beans>

applicationContext.xml

MultipleDataSource 实现

package com.cnblogs.lzrabbit;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
/**


Created by rabbit on 14-5-25.
*/
public class MultipleDataSource extends AbstractRoutingDataSource {
private static final ThreadLocal<String> dataSourceKey = new InheritableThreadLocal<String>();
public static void setDataSourceKey(String dataSource) {
dataSourceKey.set(dataSource);
}
@Override
protected Object determineCurrentLookupKey() {
return dataSourceKey.get();
}
}

MyBatis 接口 Mapper 定义，直接使用注解方式实现

public interface MySqlMapper {
    @Select("select * from MyTable")
    List<Map<String,Object>> getList();}
public interface SqlServerMapper {
@Select("select * from MyTable")
List<Map<String,Object>> getList();
}

手动数据源切换调用

package com.cnblogs.lzrabbit;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**


Created by rabbit on 14-5-25.
*/
public class Main {
public static void main(String[] args) {
//初始化 ApplicationContext
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
 MySqlMapper mySqlMapper </span>= applicationContext.getBean(MySqlMapper.<span style="color: rgba(0, 0, 255, 1)">class</span><span style="color: rgba(0, 0, 0, 1)">);

 SqlServerMapper sqlServerMapper </span>= applicationContext.getBean(SqlServerMapper.<span style="color: rgba(0, 0, 255, 1)">class</span><span style="color: rgba(0, 0, 0, 1)">);

 </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">设置数据源为MySql,使用了AOP测试时请将下面这行注释</span>
 MultipleDataSource.setDataSourceKey("mySqlDataSource"<span style="color: rgba(0, 0, 0, 1)">);
 mySqlMapper.getList();
 </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">设置数据源为SqlServer,使用AOP测试时请将下面这行注释</span>
 MultipleDataSource.setDataSourceKey("sqlServerDataSource"<span style="color: rgba(0, 0, 0, 1)">);
 sqlServerMapper.getList();

}
}

使用 SpringAOP 方式实现自动切换

package com.cnblogs.lzrabbit;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;
@Component
@Aspect
public class MultipleDataSourceAspectAdvice {
@Around(</span>"execution(* com.cnblogs.lzrabbit.*.*(..))"<span style="color: rgba(0, 0, 0, 1)">)
</span><span style="color: rgba(0, 0, 255, 1)">public</span> Object doAround(ProceedingJoinPoint jp) <span style="color: rgba(0, 0, 255, 1)">throws</span><span style="color: rgba(0, 0, 0, 1)"> Throwable {
    </span><span style="color: rgba(0, 0, 255, 1)">if</span> (jp.getTarget() <span style="color: rgba(0, 0, 255, 1)">instanceof</span><span style="color: rgba(0, 0, 0, 1)"> MySqlMapper) {
        MultipleDataSource.setDataSourceKey(</span>"mySqlDataSource"<span style="color: rgba(0, 0, 0, 1)">);
    } </span><span style="color: rgba(0, 0, 255, 1)">else</span> <span style="color: rgba(0, 0, 255, 1)">if</span> (jp.getTarget() <span style="color: rgba(0, 0, 255, 1)">instanceof</span><span style="color: rgba(0, 0, 0, 1)"> SqlServerMapper) {
        MultipleDataSource.setDataSourceKey(</span>"sqlServerDataSource"<span style="color: rgba(0, 0, 0, 1)">);
    }
    </span><span style="color: rgba(0, 0, 255, 1)">return</span><span style="color: rgba(0, 0, 0, 1)"> jp.proceed();
}

}

调用日志

2014-05-25 20:02:04,319 DEBUG [main] com.cnblogs.lzrabbit.MySqlMapper.getList - ooo Using Connection [jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true, UserName=root@192.168.1.32, MySQL Connector Java]
2014-05-25 20:02:04,333 DEBUG [main] com.cnblogs.lzrabbit.MySqlMapper.getList - ==>  Preparing: select * from MyTable 
2014-05-25 20:02:04,371 DEBUG [main] com.cnblogs.lzrabbit.MySqlMapper.getList - ==> Parameters: 
2014-05-25 20:02:04,396 DEBUG [main] com.cnblogs.lzrabbit.MySqlMapper.getList - <==      Total: 8
2014-05-25 20:02:04,620 DEBUG [main] com.cnblogs.lzrabbit.SqlServerMapper.getList - ooo Using Connection [jdbc:jtds:sqlserver://127.0.0.1:1433/test, UserName=sa, jTDS Type 4 JDBC Driver for MS SQL Server and Sybase]
2014-05-25 20:02:04,620 DEBUG [main] com.cnblogs.lzrabbit.SqlServerMapper.getList - ==>  Preparing: select * from TmallCityMap 
2014-05-25 20:02:04,621 DEBUG [main] com.cnblogs.lzrabbit.SqlServerMapper.getList - ==> Parameters: 
2014-05-25 20:02:04,681 DEBUG [main] com.cnblogs.lzrabbit.SqlServerMapper.getList - <==      Total: 397

这里就上面的实现做个简单解释，在我们配置单数据源时可以看到数据源类型使用了 org.apache.commons.dbcp.BasicDataSource，而这个代码实现了 javax.sql.DataSource 接口

配置 sqlSessionFactory 时 org.mybatis.spring.SqlSessionFactoryBean 注入参数 dataSource 类型就是 javax.sql.DataSource

实现多数据源的方法就是我们自定义了一个 MultipleDataSource，这个类继承自 AbstractRoutingDataSource，而 AbstractRoutingDataSource 继承自 AbstractDataSource ，AbstractDataSource 实现了 javax.sql.DataSource 接口，所以我们的 MultipleDataSource 也实现了 javax.sql.DataSource 接口，可以赋值给 sqlSessionFactory 的 dataSource 属性

public abstract class AbstractRoutingDataSource extends AbstractDataSource implements InitializingBean {
}
public abstract class AbstractDataSource implements DataSource {
}

再来说下 MultipleDataSource 的实现原理，MultipleDataSource 实现 AbstractRoutingDataSource 抽象类，然后实现了 determineCurrentLookupKey 方法，这个方法用于选择具体使用 targetDataSources 中的哪一个数据源

<bean id="multipleDataSource" class="com.cnblogs.lzrabbit.MultipleDataSource">
        <property name="defaultTargetDataSource" ref="mySqlDataSource"/>
        <property name="targetDataSources">
            <map>
                <entry key="mySqlDataSource" value-ref="mySqlDataSource"/>
                <entry key="sqlServerDataSource" value-ref="sqlServerDataSource"/>
            </map>
        </property>
    </bean>

可以看到 Spring 配置中 multipleDataSource 设置了两个属性 defaultTargetDataSource 和 targetDataSources，这两个属性定义在 AbstractRoutingDataSource，当 MyBatis 执行查询时会先选择数据源，选择顺序时现根据 determineCurrentLookupKey 方法返回的值到 targetDataSources 中去找，若能找到怎返回对应的数据源，若找不到返回默认的数据源 defaultTargetDataSource，具体参考 AbstractRoutingDataSource 的源码

public abstract class AbstractRoutingDataSource extends AbstractDataSource implements InitializingBean {
</span><span style="color: rgba(0, 0, 255, 1)">private</span> Map&lt;Object, Object&gt;<span style="color: rgba(0, 0, 0, 1)"> targetDataSources;

</span><span style="color: rgba(0, 0, 255, 1)">private</span><span style="color: rgba(0, 0, 0, 1)"> Object defaultTargetDataSource;


</span><span style="color: rgba(0, 128, 0, 1)">/**</span><span style="color: rgba(0, 128, 0, 1)">
 * Retrieve the current target DataSource. Determines the
 * {</span><span style="color: rgba(128, 128, 128, 1)">@link</span><span style="color: rgba(0, 128, 0, 1)"> #determineCurrentLookupKey() current lookup key}, performs
 * a lookup in the {</span><span style="color: rgba(128, 128, 128, 1)">@link</span><span style="color: rgba(0, 128, 0, 1)"> #setTargetDataSources targetDataSources} map,
 * falls back to the specified
 * {</span><span style="color: rgba(128, 128, 128, 1)">@link</span><span style="color: rgba(0, 128, 0, 1)"> #setDefaultTargetDataSource default target DataSource} if necessary.
 * </span><span style="color: rgba(128, 128, 128, 1)">@see</span><span style="color: rgba(0, 128, 0, 1)"> #determineCurrentLookupKey()
 </span><span style="color: rgba(0, 128, 0, 1)">*/</span>
<span style="color: rgba(0, 0, 255, 1)">protected</span><span style="color: rgba(0, 0, 0, 1)"> DataSource determineTargetDataSource() {
    Assert.notNull(</span><span style="color: rgba(0, 0, 255, 1)">this</span>.resolvedDataSources, "DataSource router not initialized"<span style="color: rgba(0, 0, 0, 1)">);
    Object lookupKey </span>=<span style="color: rgba(0, 0, 0, 1)"> determineCurrentLookupKey();
    DataSource dataSource </span>= <span style="color: rgba(0, 0, 255, 1)">this</span><span style="color: rgba(0, 0, 0, 1)">.resolvedDataSources.get(lookupKey);
    </span><span style="color: rgba(0, 0, 255, 1)">if</span> (dataSource == <span style="color: rgba(0, 0, 255, 1)">null</span> &amp;&amp; (<span style="color: rgba(0, 0, 255, 1)">this</span>.lenientFallback || lookupKey == <span style="color: rgba(0, 0, 255, 1)">null</span><span style="color: rgba(0, 0, 0, 1)">)) {
        dataSource </span>= <span style="color: rgba(0, 0, 255, 1)">this</span><span style="color: rgba(0, 0, 0, 1)">.resolvedDefaultDataSource;
    }
    </span><span style="color: rgba(0, 0, 255, 1)">if</span> (dataSource == <span style="color: rgba(0, 0, 255, 1)">null</span><span style="color: rgba(0, 0, 0, 1)">) {
        </span><span style="color: rgba(0, 0, 255, 1)">throw</span> <span style="color: rgba(0, 0, 255, 1)">new</span> IllegalStateException("Cannot determine target DataSource for lookup key [" + lookupKey + "]"<span style="color: rgba(0, 0, 0, 1)">);
    }
    </span><span style="color: rgba(0, 0, 255, 1)">return</span><span style="color: rgba(0, 0, 0, 1)"> dataSource;
}

</span><span style="color: rgba(0, 128, 0, 1)">/**</span><span style="color: rgba(0, 128, 0, 1)">
 * Determine the current lookup key. This will typically be
 * implemented to check a thread-bound transaction context.
 * &lt;p&gt;Allows for arbitrary keys. The returned key needs
 * to match the stored lookup key type, as resolved by the
 * {</span><span style="color: rgba(128, 128, 128, 1)">@link</span><span style="color: rgba(0, 128, 0, 1)"> #resolveSpecifiedLookupKey} method.
 </span><span style="color: rgba(0, 128, 0, 1)">*/</span>
<span style="color: rgba(0, 0, 255, 1)">protected</span> <span style="color: rgba(0, 0, 255, 1)">abstract</span><span style="color: rgba(0, 0, 0, 1)"> Object determineCurrentLookupKey();<br>　　<br>　　.............

}

在动态切换数据源方法时选择了 AOP 方式实现，这里实现的简单粗暴，具体应用时根据实际需要灵活变通吧

题外话，这里提下 SqlServer 驱动选择的问题，目前 SqlServer 的驱动主要有微软的官方驱动和 JTDS 驱动两种，关于这两个驱动我做过测试，批量更新，在小数据量 (100 以下) 时，JTDS 相对微软驱动性能稍微高一点点，在数据量增大时几万到上百万时，微软驱动有着明显优势，所以若对性能比较敏感，建议使用微软驱动，否则随意

微软驱动在 Maven 库找不到，这点比较郁闷，若使用 maven 的话还得先安装到本地，这点很不爽

JTDS 使用比较方便 Maven 直接引用即可

相关 jar maven 引用

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        <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">groupId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>org.mybatis<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">groupId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
        <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">artifactId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>mybatis-spring<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">artifactId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
        <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">version</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>1.2.2<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">version</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
    <span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">dependency</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
    <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">dependency</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
        <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">groupId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>org.slf4j<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">groupId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
        <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">artifactId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>slf4j-log4j12<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">artifactId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
        <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">version</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>1.7.6<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">version</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
    <span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">dependency</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
    <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">dependency</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
        <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">groupId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>net.sourceforge.jtds<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">groupId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
        <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">artifactId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>jtds<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">artifactId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
        <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">version</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>1.2.8<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">version</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
    <span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">dependency</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
    <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">dependency</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
        <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">groupId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>mysql<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">groupId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
        <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">artifactId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>mysql-connector-java<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">artifactId</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
        <span style="color: rgba(0, 0, 255, 1)">&lt;</span><span style="color: rgba(128, 0, 0, 1)">version</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>5.1.29<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">version</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
    <span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">dependency</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span>
<span style="color: rgba(0, 0, 255, 1)">&lt;/</span><span style="color: rgba(128, 0, 0, 1)">dependencies</span><span style="color: rgba(0, 0, 255, 1)">&gt;</span></pre>

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Spring+MyBatis多数据源配置实现

%c 输出日志信息所属的类的全名

%d 输出日志时间点的日期或时间，默认格式为 ISO8601，也可以在其后指定格式，比如：%d{yyy-MM-dd HH🇲🇲ss}，输出类似：2002-10-18- 22：10：28

%f 输出日志信息所属的类的类名

%l 输出日志事件的发生位置，即输出日志信息的语句处于它所在的类的第几行

%m 输出代码中指定的信息，如 log(message) 中的 message

%n 输出一个回车换行符，Windows 平台为“rn”，Unix 平台为“n”

%p 输出优先级，即 DEBUG，INFO，WARN，ERROR，FATAL。如果是调用 debug() 输出的，则为 DEBUG，依此类推

%r 输出自应用启动到输出该日志信息所耗费的毫秒数

%t 输出产生该日志事件的线程名

MS SQL Server

MS SQL Server (JTDS)

通用配置

相关帖子

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Spring+MyBatis多数据源配置实现