1. ibatis3.*版本以后正式改名为mybaits，它也从apache转到了google code下；也就是说ibatis2.*，mybatis3.*。

2. 映射文件的不同

ibatis的配置文件如下

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE sqlMapConfig      PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"      "http://ibatis.apache.org/dtd/sql-map-config-2.dtd"><sqlMapConfig><!-- 公共配置 --><settings useStatementNamespaces="true" maxRequests="3000"maxSessions="1000" maxTransactions="3000" /><!-- 配置文件        begin -->    <sqlMap resource="com/test/biz/dao/sql/AA_SqlMap.xml" />

<pre name="code" class="html"> <sqlMap resource="com/test/biz/dao/sql/BB_SqlMap.xml" />

</sqlMapConfig>
mybatis的配置文件如下

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><settings><!-- changes from the defaults for testing --><setting name="cacheEnabled" value="false" /><setting name="useGeneratedKeys" value="true" /><setting name="defaultExecutorType" value="REUSE" /><!-- 延迟加载 --><setting name="lazyLoadingEnabled" value="true" /><setting name="aggressiveLazyLoading" value="false" /></settings><mappers><mapper resource="com/test/biz/dao/sql/AAMapper.xml"/></mappers>
</configuration>

从以上两个配置文件，大致分析有哪些不同点：

2.1 dtd约束文件不同

2.2 ibatis中根元素是sqlMapConfig，mybatis中是configuration；

2.3 settings属性的不同配置

ibatis中是

<settings 属性1="属性值1" 属性2="属性值2"  属性x="属性值x"/>

mybatis中是

<settings>

<setting name="属性1" value="属性值1"/>

<setting name="属性2" value="属性值2"/>

<setting name="属性x" value="属性值x"/>

</settings>
2.4 ibatis中是使用sqlMap元素，mybatis中是使用mappers元素；

2.5 数据库表的映射区别

ibatis中某表的映射文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd" >
<sqlMap namespace="PP_CLASS_PROPERTY"><resultMap id="BaseResultMap" class="com.test.biz.dto.PpClassProperty"><result column="ID" property="id" jdbcType="VARCHAR" /><result column="CLASS_ID" property="classId" jdbcType="VARCHAR" /><result column="PROPERTY_ID" property="propertyId" jdbcType="VARCHAR" /><result column="INPUT_TYPE" property="inputType" jdbcType="VARCHAR" /><result column="SORT_NUM" property="sortNum" jdbcType="DECIMAL" /><result column="DESCRIPTION" property="description" jdbcType="VARCHAR" /><result column="CREATED_DATE" property="createdDate" jdbcType="TIMESTAMP" /><result column="CREATED_BY" property="createdBy" jdbcType="VARCHAR" /><result column="UPDATED_DATE" property="updatedDate" jdbcType="TIMESTAMP" /><result column="UPDATED_BY" property="updatedBy" jdbcType="VARCHAR" /><result column="STATUS" property="status" jdbcType="DECIMAL" /><result column="IS_KEY" property="isKey" jdbcType="DECIMAL" /><result column="IS_SPU" property="isSpu" jdbcType="DECIMAL" /><result column="IS_SALE" property="isSale" jdbcType="DECIMAL" /><result column="IS_PRODUCT" property="isProduct" jdbcType="DECIMAL" /><result column="CHANNEL_ID" property="channelId" jdbcType="VARCHAR" /><result column="COMPANY_ID" property="companyId" jdbcType="VARCHAR" /></resultMap><resultMap id="ResultMapWithClassName" class="com.test.biz.dto.PpClassProperty"extends="PP_CLASS_PROPERTY.BaseResultMap"><result property="propertyName" jdbcType="VARCHAR" /><result property="className" jdbcType="VARCHAR" /></resultMap><resultMap id="ResultMapWithClassNameForPage" class="com.test.biz.dto.PpClassProperty"extends="PP_CLASS_PROPERTY.BaseResultMap"><result property="propertyName" jdbcType="VARCHAR" /><result property="className" jdbcType="VARCHAR" /><result column="rnum" property="rnum" jdbcType="VARCHAR" /></resultMap><sql id="Base_Column_List">ID, CLASS_ID, PROPERTY_ID, INPUT_TYPE, SORT_NUM,DESCRIPTION,CREATED_DATE, CREATED_BY,UPDATED_DATE, UPDATED_BY, STATUS,IS_KEY, IS_SPU, IS_SALE, IS_PRODUCT,CHANNEL_ID,COMPANY_ID</sql><sql id="p_Base_Column_List">P.ID, P.CLASS_ID, P.PROPERTY_ID, P.INPUT_TYPE, P.SORT_NUM,P.DESCRIPTION,P.CREATED_DATE,P.CREATED_BY, P.UPDATED_DATE,P.UPDATED_BY, P.STATUS, P.IS_KEY, P.IS_SPU,P.IS_SALE,P.IS_PRODUCT,P.CHANNEL_ID,P.COMPANY_ID</sql><!-- 0：未删除 1：已删除 --><select id="selectByPrimaryKey" resultMap="BaseResultMap"parameterClass="com.test.biz.dto.PpClassProperty">SELECT<include refid="PP_CLASS_PROPERTY.Base_Column_List" />FROM PP_CLASS_PROPERTYWHERE ID = #id:VARCHAR# AND<include refid="COMMON_JUDGEMENT_RULE.Judge_Status_ChannelId_CompanyId" /></select><!-- 删除执行的是修改状态为1，表示已删除 --><update id="deleteByPrimaryKey" parameterClass="com.test.biz.dto.PpClassProperty">UPDATEPP_CLASS_PROPERTYSET STATUS = 1where ID = #id:VARCHAR# AND<include refid="COMMON_JUDGEMENT_RULE.Judge_Status_ChannelId_CompanyId" /></update><!-- 全字段 添加 --><insert id="insert" parameterClass="com.test.biz.dto.PpClassProperty">INSERT INTO PP_CLASS_PROPERTY(<include refid="PP_CLASS_PROPERTY.Base_Column_List" />)VALUES (#id:VARCHAR#, #classId:VARCHAR#,#propertyId:VARCHAR#,#inputType:VARCHAR#,#sortNum:DECIMAL#,#description:VARCHAR#,#createdDate:TIMESTAMP#,#createdBy:VARCHAR#,#updatedDate:TIMESTAMP#,#updatedBy:VARCHAR#, 0,#isKey:DECIMAL#,#isSpu:DECIMAL#,#isSale:DECIMAL#, #isProduct:DECIMAL#,#channelId:VARCHAR#,#companyId:VARCHAR#)</insert><!-- 动态修改 --><update id="updateByPrimaryKeySelective" parameterClass="com.test.biz.dto.PpClassProperty">UPDATE PP_CLASS_PROPERTY<dynamic prepend="set"><isNotNull prepend="," property="classId">CLASS_ID =#classId:VARCHAR#</isNotNull><isNotNull prepend="," property="propertyId">PROPERTY_ID =#propertyId:VARCHAR#</isNotNull><isNotNull prepend="," property="inputType">INPUT_TYPE =#inputType:VARCHAR#</isNotNull><isNotNull prepend="," property="sortNum">SORT_NUM =#sortNum:DECIMAL#</isNotNull><isNotNull prepend="," property="description">DESCRIPTION =#description:VARCHAR#</isNotNull><isNotNull prepend="," property="createdDate">CREATED_DATE =#createdDate:TIMESTAMP#</isNotNull><isNotNull prepend="," property="createdBy">CREATED_BY =#createdBy:VARCHAR#</isNotNull><isNotNull prepend="," property="updatedDate">UPDATED_DATE =#updatedDate:TIMESTAMP#</isNotNull><isNotNull prepend="," property="updatedBy">UPDATED_BY =#updatedBy:VARCHAR#</isNotNull><isNotNull prepend="," property="status">STATUS = #status:DECIMAL#</isNotNull><isNotNull prepend="," property="isKey">IS_KEY = #isKey:DECIMAL#</isNotNull><isNotNull prepend="," property="isSpu">IS_SPU = #isSpu:DECIMAL#</isNotNull><isNotNull prepend="," property="isSale">IS_SALE = #isSale:DECIMAL#</isNotNull><isNotNull prepend="," property="isProduct">IS_PRODUCT =#isProduct:DECIMAL#</isNotNull></dynamic>WHERE ID = #id:VARCHAR# AND<include refid="COMMON_JUDGEMENT_RULE.Judge_Status_ChannelId_CompanyId" /></update><!--查询类目已经关联的属性 0：未删除 1：已删除 --><select id="selectByClassId" resultMap="BaseResultMap"parameterClass="com.test.biz.dto.PpClassProperty">SELECT<include refid="PP_CLASS_PROPERTY.Base_Column_List" />FROM PP_CLASS_PROPERTYWHERE CLASS_ID = #classId:VARCHAR# AND<include refid="COMMON_JUDGEMENT_RULE.Judge_Status_ChannelId_CompanyId" /></select><!-- 统计 查询类目已经关联的属性的数量 0：未删除 1：已删除 --><select id="countByClassId" resultClass="integer"parameterClass="com.test.biz.dto.PpClassProperty">SELECTCOUNT(ID)FROM PP_CLASS_PROPERTYWHERE CLASS_ID =#classId:VARCHAR# AND<include refid="COMMON_JUDGEMENT_RULE.Judge_Status_ChannelId_CompanyId" /></select><!--根据类目id查询类目属性(包含类目名称和属性名称) 0：未删除 1：已删除 --><select id="selectWithClassNameByClassId" resultMap="ResultMapWithClassName"parameterClass="map">SELECT<include refid="p_Base_Column_List" />,PP.PROPERTY_NAME PROPERTYNAME,PC.CLASS_NAME CLASSNAMEFROMPP_CLASS_PROPERTY P,PP_PROPERTY PP,PP_CLASS PCWHERE P.CLASS_ID =#classId# AND P.CHANNEL_ID = #channelId# AND P.COMPANY_ID =#companyId#<isNotNull property="likeName">AND PP.PROPERTY_NAME LIKE '%'||#likeName#||'%'</isNotNull>AND P.CLASS_ID = PC.ID AND P.PROPERTY_ID = PP.IDAND P.CHANNEL_ID =PC.CHANNEL_ID AND P.CHANNEL_ID = PP.CHANNEL_IDAND P.COMPANY_ID =PC.COMPANY_ID AND P.COMPANY_ID = PP.COMPANY_IDAND P.STATUS=0 ANDPP.STATUS=0 AND PC.STATUS=0</select><!--根据类目id查询类目属性(包含类目名称和属性名称) 查询总数 --><select id="countPageFindPpClassPropertyByClassId" resultClass="integer"parameterClass="map">SELECTCOUNT(1)FROMPP_CLASS_PROPERTY P,PP_PROPERTY PP,PP_CLASS PCWHERE P.CLASS_ID =#classId# AND P.CHANNEL_ID = #channelId# AND P.COMPANY_ID =#companyId#<isNotNull property="likeName">AND PP.PROPERTY_NAME LIKE '%'||#likeName#||'%'</isNotNull>AND P.CLASS_ID = PC.ID AND P.PROPERTY_ID = PP.IDAND P.CHANNEL_ID =PC.CHANNEL_ID AND P.CHANNEL_ID = PP.CHANNEL_IDAND P.COMPANY_ID =PC.COMPANY_ID AND P.COMPANY_ID = PP.COMPANY_IDAND P.STATUS=0 ANDPP.STATUS=0 AND PC.STATUS=0</select><!-- 根据类目id查询该条记录时关键属性并且时type类型是input的值的信息 --><select id="findInputClassProperty" resultClass="java.util.HashMap"parameterClass="com.test.biz.dto.PpClassProperty">SELECT INPUT_TYPE AS "inputType" FROM PP_CLASS_PROPERTYWHERECLASS_ID=#classId# AND IS_KEY=1 AND (INPUT_TYPE='input' OR INPUT_TYPE='textarea') AND<include refid="COMMON_JUDGEMENT_RULE.Judge_Status_ChannelId_CompanyId" /></select></sqlMap>

mybatis的数据库表映射文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" ><mapper namespace="com.ilvyou.system.dao.SysUserMapper" ><resultMap id="BaseResultMap" type="com.ilvyou.system.entity.SysUserEntity" ><id property="id" column="ID" jdbcType="VARCHAR"/><result property="loginName" column="LOGIN_NAME" jdbcType="VARCHAR"/><result property="loginPass" column="LOGIN_PASS" jdbcType="VARCHAR"/><result property="userType" column="USER_TYPE" jdbcType="VARCHAR"/><result property="regDate" column="REG_DATE" jdbcType="CHAR"/><result property="email" column="EMAIL" jdbcType="VARCHAR"/><result property="mobile" column="MOBILE" jdbcType="VARCHAR"/><result property="qq" column="QQ" jdbcType="VARCHAR"/><result property="photo" column="PHOTO" jdbcType="VARCHAR"/><result property="cardType" column="CARD_TYPE" jdbcType="VARCHAR"/><result property="cardValue" column="CARD_VALUE" jdbcType="VARCHAR"/><result property="userName" column="USER_NAME" jdbcType="VARCHAR"/><result property="userSex" column="USER_SEX" jdbcType="VARCHAR"/><result property="userBir" column="USER_BIR" jdbcType="CHAR"/><result property="userAddr" column="USER_ADDR" jdbcType="VARCHAR"/><result property="jobName" column="JOB_NAME" jdbcType="VARCHAR"/><result property="jobAddr" column="JOB_ADDR" jdbcType="VARCHAR"/><result property="jobTel" column="JOB_TEL" jdbcType="VARCHAR"/><result property="bornAddr" column="BORN_ADDR" jdbcType="VARCHAR"/><result property="userStatus" column="USER_STATUS" jdbcType="INTEGER"/><result property="roleType" column="ROLE_TYPE" jdbcType="VARCHAR"/></resultMap><sql id="Base_Column_List">ID          ,LOGIN_NAME  ,LOGIN_PASS  ,USER_TYPE   ,REG_DATE    ,EMAIL       ,MOBILE      ,QQ          ,PHOTO       ,CARD_TYPE   ,CARD_VALUE  ,USER_NAME   ,USER_SEX    ,USER_BIR    ,USER_ADDR   ,JOB_NAME    ,JOB_ADDR    ,JOB_TEL     ,BORN_ADDR   ,USER_STATUS ,ROLE_TYPE</sql><sql id="select_by_page_outter_orderby_sql" ><if test="orderByClause != null">    order by ${orderByClause}   </if> </sql><!--select mothed--><select id="selectByPrimaryKey" parameterType="String" resultMap="SysUserEntityResultMap">select <include refid="Base_Column_List" />from SYS_USERwhere ID = #{id,jdbcType=VARCHAR}</select><!--insert mothed--><insert id="insert" parameterType="com.ilvyou.system.entity.SysUserEntity">insert into SYS_USER (<include refid="Base_Column_List" />)values (#{id,jdbcType=VARCHAR},#{loginName,jdbcType=VARCHAR},#{loginPass,jdbcType=VARCHAR},#{userType,jdbcType=VARCHAR},#{regDate,jdbcType=CHAR},#{email,jdbcType=VARCHAR},#{mobile,jdbcType=VARCHAR},#{qq,jdbcType=VARCHAR},#{photo,jdbcType=VARCHAR},#{cardType,jdbcType=VARCHAR},#{cardValue,jdbcType=VARCHAR},#{userName,jdbcType=VARCHAR},#{userSex,jdbcType=VARCHAR},#{userBir,jdbcType=CHAR},#{userAddr,jdbcType=VARCHAR},#{jobName,jdbcType=VARCHAR},#{jobAddr,jdbcType=VARCHAR},#{jobTel,jdbcType=VARCHAR},#{bornAddr,jdbcType=VARCHAR},#{userStatus,jdbcType=INTEGER},#{roleType,,jdbcType=VARCHAR})</insert><insert id="batchInsert" >    insert into SYS_USER (<include refid="Base_Column_List" />)  values     <foreach collection="list" item="item" index="index" separator=",">(#{item.id,jdbcType=VARCHAR},#{item.loginName,jdbcType=VARCHAR},#{item.loginPass,jdbcType=VARCHAR},#{item.userType,jdbcType=VARCHAR},#{item.regDate,jdbcType=CHAR},#{item.email,jdbcType=VARCHAR},#{item.mobile,jdbcType=VARCHAR},#{item.qq,jdbcType=VARCHAR},#{item.photo,jdbcType=VARCHAR},#{item.cardType,jdbcType=VARCHAR},#{item.cardValue,jdbcType=VARCHAR},#{item.userName,jdbcType=VARCHAR},#{item.userSex,jdbcType=VARCHAR},#{item.userBir,jdbcType=CHAR},#{item.userAddr,jdbcType=VARCHAR},#{item.jobName,jdbcType=VARCHAR},#{item.jobAddr,jdbcType=VARCHAR},#{item.jobTel,jdbcType=VARCHAR},#{item.bornAddr,jdbcType=VARCHAR},#{item.userStatus,jdbcType=INTEGER},#{item.roleType,jdbcType=VARCHAR})</foreach></insert><update id="updateByPrimaryKeySelective" parameterType="com.ilvyou.system.entity.SysUserEntity">update SYS_USER<set><if test="id != null">ID = #{id,jdbcType=VARCHAR},</if><if test="loginName != null">LOGIN_NAME = #{loginName,jdbcType=VARCHAR},</if><if test="loginPass != null">LOGIN_PASS = #{loginPass,jdbcType=VARCHAR},</if><if test="userType != null">USER_TYPE = #{userType,jdbcType=VARCHAR},</if><if test="regDate != null">REG_DATE = #{regDate,jdbcType=CHAR},</if><if test="email != null">EMAIL = #{email,jdbcType=VARCHAR},</if><if test="mobile != null">MOBILE = #{mobile,jdbcType=VARCHAR},</if><if test="qq != null">QQ = #{qq,jdbcType=VARCHAR},</if><if test="photo != null">PHOTO = #{photo,jdbcType=VARCHAR},</if><if test="cardType != null">CARD_TYPE = #{cardType,jdbcType=VARCHAR},</if><if test="cardValue != null">CARD_VALUE = #{cardValue,jdbcType=VARCHAR},</if><if test="userName != null">USER_NAME = #{userName,jdbcType=VARCHAR},</if><if test="userSex != null">USER_SEX = #{userSex,jdbcType=VARCHAR},</if><if test="userBir != null">USER_BIR = #{userBir,jdbcType=CHAR},</if><if test="userAddr != null">USER_ADDR = #{userAddr,jdbcType=VARCHAR},</if><if test="jobName != null">JOB_NAME = #{jobName,jdbcType=VARCHAR},</if><if test="jobAddr != null">JOB_ADDR = #{jobAddr,jdbcType=VARCHAR},</if><if test="jobTel != null">JOB_TEL = #{jobTel,jdbcType=VARCHAR},</if><if test="bornAddr != null">BORN_ADDR = #{bornAddr,jdbcType=VARCHAR},</if><if test="userStatus != null">USER_STATUS = #{userStatus,jdbcType=INTEGER},</if><if test="roleType != null">ROLE_TYPE = #{roleType,jdbcType=VARCHAR},</if></set>where ID = #{id,jdbcType=VARCHAR}</update><update id="batchUpdateByPrimaryKey" >    <foreach collection="list" item="item" index="index">        update SYS_USER set LOGIN_NAME = #{item.loginName,jdbcType=VARCHAR},LOGIN_PASS = #{item.loginPass,jdbcType=VARCHAR},USER_TYPE = #{item.userType,jdbcType=VARCHAR},REG_DATE = #{item.regDate,jdbcType=CHAR},EMAIL = #{item.email,jdbcType=VARCHAR},MOBILE = #{item.mobile,jdbcType=VARCHAR},QQ = #{item.qq,jdbcType=VARCHAR},PHOTO = #{item.photo,jdbcType=VARCHAR},CARD_TYPE = #{item.cardType,jdbcType=VARCHAR},CARD_VALUE = #{item.cardValue,jdbcType=VARCHAR},USER_NAME = #{item.userName,jdbcType=VARCHAR},USER_SEX = #{item.userSex,jdbcType=VARCHAR},USER_BIR = #{item.userBir,jdbcType=CHAR},USER_ADDR = #{item.userAddr,jdbcType=VARCHAR},JOB_NAME = #{item.jobName,jdbcType=VARCHAR},JOB_ADDR = #{item.jobAddr,jdbcType=VARCHAR},JOB_TEL = #{item.jobTel,jdbcType=VARCHAR},BORN_ADDR = #{item.bornAddr,jdbcType=VARCHAR},USER_STATUS = #{item.userStatus,jdbcType=INTEGER},ROLE_TYPE = #{item.roleType,jdbcType=VARCHAR}where ID = #{item.id,jdbcType=VARCHAR}</foreach></update><!--delete mothed--><delete id="deleteByPrimaryKey" parameterType="String">delete from SYS_USERwhere ID = #{id,jdbcType=VARCHAR}</delete><delete id="batchDelete">delete from SYS_USER where ID in (<foreach collection="list" item="item" index="index" separator=",">#{item.id,jdbcType=VARCHAR}</foreach>)</delete></mapper>

两者的区别有：

2.5.1 ibatis中根元素是sqlMap，mybatis中是mapper；

2.5.2 在 iBatis 中，namespace 不是必需的，且它的存在没有实际的意义。在 MyBatis 中，namespace 终于派上用场了，它使得映射文件与接口绑定变得非常自然。

2.5.3 ibatis中有resultMap和resultClass两种返回类型，resultMap是我们在ibatis的配置文件中定义的，也就是在配置文件中使用resultMap元素定义的；resultClass是指java语言中内置的类型，如：integer、java.util.HashMap等等；

mybatis中将两者统一为resultType，这样挺好的，开发者不用再记两个属性了。

2.5.4 ibatis中有parameterClass，mybatis中有parameterType，两者区别不大。

2.5.5 参数的写法比较

ibatis中写法，如代码片段：

WHERE ID = #id:VARCHAR#

mybatis中写法，如代码片段：

where ID = #{id,jdbcType=VARCHAR}

2.5.6 iBatis/MyBatis 调用存储过程的写法

iBatis 调用存储过程的方法，通过使用 <procedure> 元素进行存储过程的调用：

<parameterMap id="swapParameters" class="map" >     <parameter property="contactId" jdbcType="INTEGER" javaType="java.lang.Integer" mode="IN"/>     <parameter property="firstName" jdbcType="VARCHAR" javaType="java.lang.String" mode="IN"/>       <parameter property="lastName" jdbcType="VARCHAR" javaType="java.lang.String" mode="IN"/>     </parameterMap>     <procedure id="swapContactName" parameterMap="swapParameters" >     {call swap_contact_name (?, ?,?)}      </procedure>   

在 MyBatis 中，<proccedure> 元素已经被移除，通过 <select>、<insert> 和 <update> 进行定义：

  <select id="swapContactName" parameterMap="swapParameters" statementType="CALLABLE">  { ? = call swap_contact_name (?,?,?)}   </select>

如上所示，通过 statementType 属性将该语句标识为存储过程而非普通 SQL 语句。

2.6 ibatis和mybatis与spring的集成配置

ibatis的配置

    <!--===================================================================== --><!-- iBATIS 配置文件定义 --><!--===================================================================== --><bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean"><property name="configLocation" value="classpath:sqlMap-config.xml" /><property name="dataSource" ref="dataSource" /></bean>

mybatis的配置

  <!-- define the MyBatis SqlSessionFactory --><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource" /><property name="configLocation" value="classpath:com/ilvyou/core/config/mybatis-config.xml" /><property name="mapperLocations" value="classpath*:com/ilvyou/**/*Mapper.xml" /></bean>

通过前面的示例可以看出，MyBatis 在编码中的最大的改变就是将一个最常用的 API 由 SqlMapClient 改为了 SqlSessionFactory。另外，类型处理器接口也由原来的 TypeHandlerCallback 改为了 TypeHandler。最后 DataSourceFactory 也进行了调整，移动到 org.apache.ibatis.datasource 包下，其中的方法也作了微调。总之，代码层面公开的部分改动较少，不会给开发者造成较大的移植成本。