SpringMVC配置多个数据源

多数据源,说白了,就是多数据库。

想要实现多数据库查询,只需简单四步即可实现! 但这种实现方式有缺点,不能够实时切换数据库。有时间我会补一篇,通过AOP实现数据库切换的博客,通过aop+注解实现比较好。

第一步: 配置 jdbc.properties;

 1 # MySQL
 2 #============================================================================
 3 jdbc.mysql.driver=com.mysql.jdbc.Driver
 4 jdbc.mysql.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
 5 jdbc.mysql.username=root
 6 jdbc.mysql.password=root
 7 
 8 # MS SQL Server (JTDS)
 9 #============================================================================
10 jdbc.sqlserver.driver=net.sourceforge.jtds.jdbc.Driver
11 jdbc.sqlserver.url=jdbc:jtds:sqlserver://127.0.0.1:1433/test
12 jdbc.sqlserver.username=sa
13 jdbc.sqlserver.password=sa
14 
15 # 通用配置
16 #============================================================================
17 jdbc.initialSize=5
18 jdbc.minIdle=5
19 jdbc.maxIdle=20
20 jdbc.maxActive=100
21 jdbc.maxWait=100000

 

第二步:配置 spring-mybatis.xml;

 1  <!-- 多数据源配置 -->
 2     <bean id="sqlServerDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
 3         <property name="driverClassName" value="${jdbc.sqlserver.driver}"/>
 4         <property name="url" value="${jdbc.sqlserver.url}"/>
 5         <property name="username" value="${jdbc.sqlserver.username}"/>
 6         <property name="password" value="${jdbc.sqlserver.password}"/>
 7         <property name="initialSize" value="${jdbc.initialSize}"/>
 8         <property name="minIdle" value="${jdbc.minIdle}"/>
 9         <property name="maxIdle" value="${jdbc.maxIdle}"/>
10         <property name="maxActive" value="${jdbc.maxActive}"/>
11         <property name="maxWait" value="${jdbc.maxWait}"/>
12         <property name="defaultAutoCommit" value="${jdbc.defaultAutoCommit}"/>
13         <property name="removeAbandoned" value="${jdbc.removeAbandoned}"/>
14         <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}"/>
15         <property name="testWhileIdle" value="${jdbc.testWhileIdle}"/>
16         <property name="timeBetweenEvictionRunsMillis" value="${jdbc.timeBetweenEvictionRunsMillis}"/>
17         <property name="numTestsPerEvictionRun" value="${jdbc.numTestsPerEvictionRun}"/>
18         <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}"/>
19     </bean>
20     <bean id="mySqlDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
21         <property name="driverClassName" value="${jdbc.mysql.driver}"/>
22         <property name="url" value="${jdbc.mysql.url}"/>
23         <property name="username" value="${jdbc.mysql.username}"/>
24         <property name="password" value="${jdbc.mysql.password}"/>
25         <property name="initialSize" value="${jdbc.initialSize}"/>
26         <property name="minIdle" value="${jdbc.minIdle}"/>
27         <property name="maxIdle" value="${jdbc.maxIdle}"/>
28         <property name="maxActive" value="${jdbc.maxActive}"/>
29         <property name="maxWait" value="${jdbc.maxWait}"/>
30         <property name="defaultAutoCommit" value="${jdbc.defaultAutoCommit}"/>
31         <property name="removeAbandoned" value="${jdbc.removeAbandoned}"/>
32         <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}"/>
33         <property name="testWhileIdle" value="${jdbc.testWhileIdle}"/>
34         <property name="timeBetweenEvictionRunsMillis" value="${jdbc.timeBetweenEvictionRunsMillis}"/>
35         <property name="numTestsPerEvictionRun" value="${jdbc.numTestsPerEvictionRun}"/>
36         <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}"/>
37     </bean>
38                     
39     <bean id="dataSource" class="xx.xxx.DynamicDataSource"><!--注意: 这里写选择数据源的类地址 下面跟着给出-->
40         <property name="defaultTargetDataSource" ref="mySqlDataSource"/><!-- 设置默认为此mySqlDataSource数据源-->
41         <property name="targetDataSources">
42             <map>
43                 <entry key="mySqlDataSource" value-ref="mySqlDataSource"/>
44                 <entry key="sqlServerDataSource" value-ref="sqlServerDataSource"/>
45             </map>
46         </property>
47     </bean>

 

第三步:添加数据源的类;(借助ThreadLocal类,通过ThreadLocal类传递数据源的参数)

 1 import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;  
 2 /* 
 3  * 配置多数据源 
 4  */  
 5 
 6 public class DynamicDataSource extends AbstractRoutingDataSource{  
 7   
 8     public static final String  mySqlDataSource= "mySqlDataSource";  
 9       
10     public static final String sqlServerDataSource = "sqlServerDataSource";  
11     //本地线程,获取当前正在执行的currentThread  
12     public static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();   
13       
14     public static void setCustomerType(String customerType) {  
15   
16         contextHolder.set(customerType);  
17       
18     }  
19   
20     public static String getCustomerType() {  
22         return contextHolder.get();       
24     }  
25   
26     public static void clearCustomerType() {  
28         contextHolder.remove();  
30     }  
31   
32     @Override  
33     protected Object determineCurrentLookupKey() {  
35         return getCustomerType();    
37     }  
38 }

 

最后一步:使用;

 public void  findOrder(){
          List<PayOrder> list = new ArrayList<>();
DynamicDataSource.clearCustomerType();//重点: 实际操作证明,切换的时候最好清空一下
DynamicDataSource.setCustomerType(DynamicDataSource.sqlServerDataSource);//切换数据源,设置后 就OK了。可以随时切换过来(在controller层切换)
      list =mapper.findByUid("-14663");
      System.out.println(list);
      DynamicDataSource.clearCustomerType();//
      DynamicDataSource.setCustomerType(DynamicDataSource.sqlServerDataSource);//切换回主数据源 

6 }

 

posted @ 2018-04-25 17:09  现世安稳。  阅读(18718)  评论(0编辑  收藏  举报