mybatis如何读取clob数据 详细过程

<? xml  version = "1.0"  encoding = "UTF-8" ?>
<!DOCTYPE mapper
  PUBLIC "-////DTD Mapper 3.0//EN">

< mapper  namespace = ""  >

    <!-- Result Map-->
    < resultMap  type = ""  id = "BaseResultMap" >
        < result  property = "id"  column = "id"  />
        < result  property = "name"  column = "name"  />
        < result  property = "sex"  column = "sex"  />
        < result  property = "birs"  column = "birs"  jdbcType = "TIMESTAMP" />
        < result  property = "message"  column = "message"  jdbcType = "CLOB"
            javaType = ""  typeHandler =""/>
    </ resultMap >

    < sql  id = "Tabel_Name" >
        t_users
    </ sql >

    <!-- 表中所有列 -->
    < sql  id = "Base_Column_List"  >
        id,name,sex,birs,message
    </ sql >

    <!-- 查询条件 -->
    < sql  id = "Example_Where_Clause" >
        where 1=1
        < trim  suffixOverrides = "," >
            < if  test = "id != null" >
                and id = #{id}
            </ if >
            < if  test = "name != null and name != ''" >
                and name like concat(concat('%', '${name}'), '%')
            </ if >
            < if  test = "sex != null and sex != ''" >
                and sex like concat(concat('%', '${sex}'), '%')
            </ if >
            < if  test = "birs != null" >
                and birs = #{birs}
            </ if >
            < if  test = "message != null" >
                and message = #{message}
            </ if >
        </ trim >
    </ sql >

    <!-- 2.查询列表 -->
    < select  id = "queryByList"  resultMap = "BaseResultMap"  parameterType = "Object" >
        select
        < include  refid = "Base_Column_List"  />
        from t_users
        < include  refid = "Example_Where_Clause" />
    </ select >
</ mapper >