Attribute "resultType" must be declared for element type

在mybatis的文件中声明resultType之后，才可以使用resultType。

在xml文件的开头一般有两行代码：

DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"

将http://mybatis.org/dtd/mybatis-3-mapper.dtd复制到浏览器中，会自动下载dtd文件，打开后，搜索update和insert和select，会发现之间的区别：

select的声明如下：

ATTLIST select
id CDATA #REQUIRED
parameterMap CDATA #IMPLIED
parameterType CDATA #IMPLIED
resultMap CDATA #IMPLIED
resultType CDATA #IMPLIED
resultSetType (FORWARD_ONLY | SCROLL_INSENSITIVE | SCROLL_SENSITIVE) #IMPLIED
statementType (STATEMENT|PREPARED|CALLABLE) #IMPLIED
fetchSize CDATA #IMPLIED
timeout CDATA #IMPLIED
flushCache (true|false) #IMPLIED
useCache (true|false) #IMPLIED
databaseId CDATA #IMPLIED
lang CDATA #IMPLIED
resultOrdered (true|false) #IMPLIED
resultSets CDATA #IMPLIED 

insert的声明如下：

ATTLIST insert
id CDATA #REQUIRED
parameterMap CDATA #IMPLIED
parameterType CDATA #IMPLIED
timeout CDATA #IMPLIED
flushCache (true|false) #IMPLIED
statementType (STATEMENT|PREPARED|CALLABLE) #IMPLIED
keyProperty CDATA #IMPLIED
useGeneratedKeys (true|false) #IMPLIED
keyColumn CDATA #IMPLIED
databaseId CDATA #IMPLIED
lang CDATA #IMPLIED

update的声明如下：

ATTLIST update
id CDATA #REQUIRED
parameterMap CDATA #IMPLIED
parameterType CDATA #IMPLIED
timeout CDATA #IMPLIED
flushCache (true|false) #IMPLIED
statementType (STATEMENT|PREPARED|CALLABLE) #IMPLIED
keyProperty CDATA #IMPLIED
useGeneratedKeys (true|false) #IMPLIED
keyColumn CDATA #IMPLIED
databaseId CDATA #IMPLIED
lang CDATA #IMPLIED