mybatis如何操作text类型(mysql)数据呢？

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public class JSONHandler implements TypeHandler<Object> {
 /**
  * json数据和类名的分隔符号
  * */
 private static final char SPLIT = '/';
 public void setParameter(PreparedStatement ps, int i, Object parameter,
   JdbcType jdbcType) throws SQLException {
    if(parameter == null){
     (i, null);
     return;
    }
    String json = (parameter);
    json  = json + SPLIT + ().getName();
    (i, json);
 }
 public Object getResult(ResultSet rs, String columnName)
   throws SQLException {
  String  json = (columnName);
  return  jsonToObject(json);
 }
 public Object getResult(CallableStatement cs, int columnIndex)
   throws SQLException {
  String  json = (columnIndex);
  return  jsonToObject(json);
 }

 /**
  * json 转换成对象
  * */
 private Object jsonToObject(String json){
  if(json == null){
   return null;
  }
  int index = (SPLIT);
  if(index  < 0){
   return null;
  }
  String key = (index + 1, ());
  json   = (0, index);
  Class<?> cls = null;
   try {
    cls = (key);
   } catch (ClassNotFoundException e) {
    throw new RuntimeException("序列化成json时找不到指定的类", e);
      }
  Object ob = (json, cls);
  return ob;
 }
}