Spring and druid can realize the functions of dynamic data source, library query, read-write separation and so on. Now let's talk about the configuration:
1. You need to configure multiple spring data sources
spring-data.xml
<!-- Dynamic data source -->
<bean id="dynamicDataSource" class="com.myproject.common.db.util.DynamicDataSource">
<!-- Associate the data source by key-value-->
<property name="targetDataSources">
<map>
<entry value-ref="dataSourceWrite" key="dataSourceWrite"></entry>
<entry value-ref="dataSourceRead" key="dataSourceRead"></entry>
</map>
</property>
<property name="defaultTargetDataSource" ref="dataSourceWrite" />
</bean>
<!--mybatis integration with Spring -->
<bean id="sqlSessionFactory" name="sqlSessionFactory"
class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:mybatis.xml"></property>
<property name="mapperLocations" value="classpath*:mapper/*.xml" />
<property name="dataSource" ref="dynamicDataSource" />
</bean>
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="sqlSessionFactory" />
</bean>
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dynamicDataSource" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
<!-- DruidDataSource -->
<bean id="dataSourceWrite" class="com.alibaba.druid.pool.DruidDataSource"
init-method="init" destroy-method="close">
<property name="url" value="${urlOracle}" />
<property name="username" value="${usernameOracle}" />
<property name="password" value="${passwordOracle}" />
<!-- Initialize connection size -->
<property name="initialSize" value="5" />
<!-- The maximum number of connections used in the connection pool-->
<property name="maxActive" value="200" />
<!-- Connection pool minimum idle-->
<property name="minIdle" value="5" />
<!-- Get the maximum wait time for connection-->
<property name="maxWait" value="60000" />
<!-- <property name="poolPreparedStatements" value="true" /> <property
name="maxPoolPreparedStatementPerConnectionSize" value="33" /> -->
<!-- <property name="validationQuery" value="${jdbc.validationQuery}" /> -->
<property name="testOnBorrow" value="false" />
<property name="testOnReturn" value="false" />
<property name="testWhileIdle" value="true" />
<!-- How long is the configuration interval to perform detection, and detect idle connections that need to be closed, in milliseconds-->
<property name="timeBetweenEvictionRunsMillis" value="60000" />
<!-- Configure the minimum lifetime of a connection in the pool, in milliseconds-->
<property name="minEvictableIdleTimeMillis" value="25200000" />
<!-- Open the removeAbandoned function-->
<property name="removeAbandoned" value="true" />
<!-- 1800 seconds, or 30 minutes -->
<property name="removeAbandonedTimeout" value="1800" />
<!-- Output the error log when closing the abandoned connection-->
<property name="logAbandoned" value="true" />
<!-- Monitoring database -->
<!-- <property name="filters" value="mergeStat" /> -->
<property name="filters" value="stat" />
<property name="defaultAutoCommit" value="true" />
</bean>
<bean id="dataSourceRead" class="com.alibaba.druid.pool.DruidDataSource"
init-method="init" destroy-method="close">
<property name="url" value="${urlMysql}" />
<property name="username" value="${usernameMysql}" />
<property name="password" value="${passwordMysql}" />
<!-- Initialize connection size -->
<property name="initialSize" value="5" />
<!-- The maximum number of connections used in the connection pool-->
<property name="maxActive" value="200" />
<!-- Connection pool minimum idle-->
<property name="minIdle" value="5" />
<!-- Get the maximum wait time for connection-->
<property name="maxWait" value="60000" />
<!-- <property name="poolPreparedStatements" value="true" /> <property
name="maxPoolPreparedStatementPerConnectionSize" value="33" /> -->
<!-- <property name="validationQuery" value="${jdbc.validationQuery}" /> -->
<property name="testOnBorrow" value="false" />
<property name="testOnReturn" value="false" />
<property name="testWhileIdle" value="true" />
<!-- How long is the configuration interval to perform detection, and detect idle connections that need to be closed, in milliseconds-->
<property name="timeBetweenEvictionRunsMillis" value="60000" />
<!-- Configure the minimum lifetime of a connection in the pool, in milliseconds-->
<property name="minEvictableIdleTimeMillis" value="25200000" />
<!-- Open the removeAbandoned function-->
<property name="removeAbandoned" value="true" />
<!-- 1800 seconds, or 30 minutes -->
<property name="removeAbandonedTimeout" value="1800" />
<!-- Output the error log when closing the abandoned connection-->
<property name="logAbandoned" value="true" />
<!-- Monitoring database -->
<!-- <property name="filters" value="mergeStat" /> -->
<property name="filters" value="stat" />
<property name="defaultAutoCommit" value="true" />
</bean>
2. You need to write a DynamicDataSource class to inherit AbstractRoutingDataSource and implement the determineCurrentLookupKey method
public class DynamicDataSource extends AbstractRoutingDataSource {
/**
*
* override determineCurrentLookupKey
* <p>
* Title: determineCurrentLookupKey
* </p>
* <p>
* Description: Automatically find datasource
* </p>
*
* @return
*/
@Override
protected Object determineCurrentLookupKey() {
return DBContextHolder.getDSType();
}
}
3. Referring to spring transaction management, use thread variables to switch data sources
public class DBContextHolder {
/**
* thread threadlocal
*/
private static ThreadLocal<String> contextHolder = new ThreadLocal<>();
private static Logger logger = LoggerFactory
.getLogger(DBContextHolder.class);
public static String getDSType() {
try {
} catch (Exception e) {
e.printStackTrace ();
logger.error("get DBTYPE faild with error:[" + e.getMessage() + "]");
}
String db = contextHolder.get();
if (db == null) {
db =UrlConnect.getKey(ConfigHelper.getToWriteKey());// The default is the read and write library
}
return db;
}
/**
*
* Set the dbtype of this thread
*
* @param str
* @see [related class/method] (optional)
* @since [product/module version] (optional)
*/
public static boolean setDSType(String str) {
try {
clearDBType();
if (str != null&&!str.equals("")) {
contextHolder.set(str);
logger.info("change thread[" + str + "] success!");
return true;
} else {
logger.info("change thread[" + str + "] faild!");
return false;
}
} catch (Exception e) {
e.printStackTrace ();
logger.error("change thread[" + str + "] faild!");
return false;
}
}
/**
* clearDBType
*
* @Title: clearDBType
* @Description: clean up the connection type
*/
public static void clearDSType() {
contextHolder.remove();
}
}
4. Switch data sources in dao
@Repository
public class BaseDAO extends SqlSessionDaoSupport {
@Resource
private SqlSessionTemplate sqlSessionTemplate;
@Resource
public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate) {
super.setSqlSessionTemplate(sqlSessionTemplate);
}
public <T> PageList<T> selectPublicListPage(String countSqlID,String sqlID,
PageList<T> page, Object obj) {
DBContextHolder.setDbType("dataSourceRead");
// total number of queries
Integer total = this.getSqlSession().selectOne(countSqlID, obj);
RowBounds rowBounds=new RowBounds(page.getFirstResult(),page.getPageSize());
// Query list information
List<T> list = this.getSqlSession().selectList(
sqlID, obj,rowBounds);
page.setTotalRecord(total!=null?total:0);
page.setDataSource(list);
page.setTotalPage((total + page.getPageSize() - 1)
/ page.getPageSize());
return page;
}
public int insert(String sqlID, Object paramObj) {
DBContextHolder.setDbType("dataSourceWrite");
return this.getSqlSession().insert(sqlID, paramObj);
}
}