ory' is required");
notNull(executorType, "Property 'executorType' is required");
this.sqlSessionFactory = sqlSessionFactory;
this.executorType = executorType;
this.exceptionTranslator = exceptionTranslator;
this.sqlSessionProxy = (SqlSession) newProxyInstance(
SqlSessionFactory.class.getClassLoader(),
new Class[] { SqlSession.class },
new SqlSessionInterceptor());
}
所以最终数据库操作有被代理SqlSessionInterceptor执行：
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
//有TransactionSynchronizationManager管理
SqlSession sqlSession = getSqlSession(
SqlSessionTemplate.this.sqlSessionFactory,
SqlSessionTemplate.this.executorType,
SqlSessionTemplate.this.exceptionTranslator);
try {
Object result = method.invoke(sqlSession, args);
if (!isSqlSessionTransactional(sqlSession, SqlSessionTemplate.this.sqlSessionFactory)) {
// force commit even on non-dirty sessions because some databases require
// a commit/rollback before calling close()
sqlSession.commit(true);
}
return result;
} catch (Throwable t) {
.....
}
}
public static SqlSession getSqlSession(SqlSessionFactory sessionFactory, ExecutorType executorType, PersistenceExceptionTranslator exceptionTranslator) {
notNull(sessionFactory, NO_SQL_SESSION_FACTORY_SPECIFIED);
notNull(executorType, NO_EXECUTOR_TYPE_SPECIFIED);
SqlSessionHolder holder = (SqlSessionHolder) TransactionSynchronizationManager.getResource(sessionFactory);
SqlSession session = sessionHolder(executorType, holder);
if (session != null) {
return session;
}
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Creating a new SqlSession");
}
//这里看到了使用sessionfactory熟悉的打开了一个session
session = sessionFactory.openSession(executorType);
registerSessionHolder(sessionFactory, executorType, exceptionTranslator, session);
return session;
}
关于事务配置可移步：http://www.jianshu.com/p/1d882343c036
三、Spring中Mybatis的配置方案二
2.1 多数据源配置案例
（1）数据源配置
<bean id="dataSourceForA" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
<property name="url" value="${db1_url}" />
<property name="username" value="$db1_user}" />
<property name="password" value="${db1_passwd}" />
<property name="maxWait" value="${db1_maxWait}" />
<property name="maxActive" value="28" />
<property name="initialSize" value="2" />
<property name="minIdle" value="0" />
<property name="timeBetweenEvictionRunsMillis" value="300000" />
<property name="testOnBorrow" value="false" />
<property name="testWhileIdle" value="true" />
<property name="validationQuery" value="select 1 from dual" />
<property name="filters" value="stat" />
</bean>
（2）创建sql