[MyBatis]mapperLocations属性通配符的使用

mapperLocations属性通配符的使用

示例：

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="configLocation" value="classpath:sqlMapConfig.xml"></property>
    <property name="mapperLocations" value="classpath*:com/huaxin/**/*Mapper.xml"></property>
</bean>

	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="configLocation" value="classpath:sqlMapConfig.xml"></property>
		<property name="mapperLocations" value="classpath*:com/huaxin/**/*Mapper.xml"></property>
	</bean>

注意点：在classpath后面的*必不可少，缺少型号的话后面的通配符不起作用。

                **表示可以表示任意多级目录，如：上述配置可以查到【com/huaxin/framework/system/dao/UserDaoMapper.xml】

                *表示多个任意字符

               缺少classpath后面的*会报以下的错误：

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
### Error querying database.  Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for framework.system.dao.UserDao.getNextUserId_MySQL
### Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for framework.system.dao.UserDao.getNextUserId_MySQL
    at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:75)
    at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:371)
    at com.sun.proxy.$Proxy18.selectOne(Unknown Source)
    at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:163)
    at com.huaxin.framework.core.dao.impl.BaseDaoImpl.selectOne(BaseDaoImpl.java:298)
    at com.huaxin.framework.system.dao.impl.UserDaoImpl.getNextUserId(UserDaoImpl.java:41)

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for framework.system.dao.UserDao.getNextUserId_MySQL
### Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for framework.system.dao.UserDao.getNextUserId_MySQL
	at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:75)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:371)
	at com.sun.proxy.$Proxy18.selectOne(Unknown Source)
	at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:163)
	at com.huaxin.framework.core.dao.impl.BaseDaoImpl.selectOne(BaseDaoImpl.java:298)
	at com.huaxin.framework.system.dao.impl.UserDaoImpl.getNextUserId(UserDaoImpl.java:41)