<classPathEntry>

驱动文件指定配置项

<classPathEntry location="/Program Files/IBM/SQLLIB/java/db2java.zip" />
 <columnOverride>

将数据库中的字段重命名为实体类的属性 

column 数据库中字段名 

property POJO属性名 

javaType POJO类型 

jdbcType 数据库字段类型 

    <table schema="DB2ADMIN" tableName="ALLTYPES" domainObjectName="Customer" >
      <property name="useActualColumnNames" value="true"/>
      <generatedKey column="ID" sqlStatement="DB2" identity="true" />
      <columnOverride column="DATE_FIELD" property="startDate" />
      <ignoreColumn column="FRED" />
      <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" />
    </table>
 <columnRenamingRule>

按规则将数据库中的字段重命名为实体类的属性 

<table schema="DB2ADMIN" tableName="ALLTYPES" domainObjectName="Customer" >
  <columnRenamingRule searchString="^CUST_" replaceString="" />
  ..
</table>
<commentGenerator>

代码上面的注释规则 

子属性：property

porperties： 

suppressAllComments  false时打开注释，true时关闭注释

suppressDate  false时打开时间标志，true时关闭...真是反人类啊 

<commentGenerator>
  <property name="suppressDate" value="true" />
</commentGenerator>
<context> 

这个实在不知道怎么解释，反正就是大环境 

targetRuntime 可选项，可填值为MyBatis3，MyBatis3Simple（默认的），Ibatis2Java2，Ibatis2Java5

<context id="DB2Tables" targetRuntime="MyBatis3">
    ...
</context>
<generatedKey> 

指定自增加以及Id 

column 字段 

sqlStatement 数据库语句，可以为MySql，DB2,SqlServer,SyBase等http://mybatis.github.io/generator/configreference/generatedKey.html 

identity true为id，false不为id 

    <table schema="DB2ADMIN" tableName="ALLTYPES" domainObjectName="Customer" >
      <property name="useActualColumnNames" value="true"/>
      <generatedKey column="ID" sqlStatement="DB2" identity="true" />
      <columnOverride column="DATE_FIELD" property="startDate" />
      <ignoreColumn column="FRED" />
      <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" />
    </table>
<ignoreColumn> 

忽略字段 

column 字段名 

    <table schema="DB2ADMIN" tableName="ALLTYPES" domainObjectName="Customer" >
      <ignoreColumn column="FRED" />
      ..
    </table>
<javaClientGenerator> 

Mapper生成配置 

type XMLMAPPER配置文件方式，ANNOTATEDMAPPER注解方式 

http://mybatis.github.io/generator/configreference/javaClientGenerator.html 

        <javaClientGenerator type="XMLMAPPER"
            targetPackage="dao.mapper" targetProject="app">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>
<javaModelGenerator> 

实体类生成配置 

http://mybatis.github.io/generator/configreference/javaModelGenerator.html 

        <javaModelGenerator targetPackage="domain"
            targetProject="app">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="false" />
        </javaModelGenerator>
<javaTypeResolver> 

mybatis里专门用来处理NUMERIC和DECIMAL类型的策略 

<javaTypeResolver>
  <property name="forceBigDecimals" value="true" />
</javaTypeResolver>
<jdbcConnection> 

jdbc配置，不解释了哈 

<jdbcConnection driverClass="COM.ibm.db2.jdbc.app.DB2Driver"
    connectionURL="jdbc:db2:MBGTEST"
    userId="db2admin"
    password="db2admin">
</jdbcConnection>
<sqlMapGenerator> 

生成sql语句的xml文件 

在mybatis2里是必须的，在mybatis3中，只有用XML方式的时候才是需要的。 

<sqlMapGenerator targetPackage="test.model"
     targetProject="\MyProject\src">
  <property name="enableSubPackages" value="true" />
</sqlMapGenerator>