Dao层如下：

int dynamicUpdateTable(@Param("table") Map table);

xml Sql：

<update id="dynamicUpdateTable" parameterType="map">

UPDATE ${table.tabName} SET

<foreach item="value" index="key" collection="table.entrySet()" separator=",">

     <if test="key!='tabName' and key!='id'">

           ${key} =  #{value}

     </if>

</foreach>

WHERE id=#{tab.id}

</update>

入参：

{

   "colname":"40",

    "id":1,

    "createTime":"2018-02-08",

    "userName":"marvers",

    "tabName":"tab_m"

}