Mybatis编写配置文件时，需要注意配置节点的顺序

mybatis-config.xml配置文件配置时，要注意节点顺序

<properties>...</properties>
<settings>...</settings>
<typeAliases>...</typeAliases>
<typeHandlers>...</typeHandlers>
<objectFactory>...</objectFactory>
<objectWrapperFactory>...</objectWrapperFactory>
<plugins>...</plugins>
<environments>...</environments>
<databaseIdProvider>...</databaseIdProvider>
<mappers>...</mappers>