mybatis调取oracle execute immediate动态拼接函数返回结果

1:编写简单函数：

create or replace function fun_dynamic(cusfun varchar2) return varchar2 is
vSQL varchar2(200);
Result varchar2(200);

begin
--vSQL := 'BEGIN :1:=FNC_TEST(2,3,:res); END;';
vSQL := 'BEGIN :1:='||cusfun||'; END;';

execute immediate vSQL using out Result;
return(Result);
end fun_dynamic;2:xml
<resultMap type="java.util.HashMap" id="resultMapFun">
<result column="res" property="res" javaType="java.lang.String" jdbcType="VARCHAR"/>
</resultMap>

<!-- 定义函数 -->
<select id="callFunction" parameterType="map" statementType="CALLABLE" resultMap="resultMapFun">
{#{res,mode=OUT,jdbcType=VARCHAR}=call fun_dynamic(#{cusfun,mode=IN,jdbcType=VARCHAR})}
</select>3:dao
public String callFunction(Map<String, String> paramMap);4:service实现类
@Override
public String callFunction(Map<String, String> paramMap) {
checkDataDao.callFunction(paramMap);
return paramMap.get("res");
}
5:controller
Map<String, String> paramMap = new HashMap<String, String>();
paramMap.put("cusfun", "fun_test('写的什么函数？','动态函数！')");
String result = checkDataService.callFunction(paramMap);
System.out.println("函数返回结果："+result);
6:输出
函数返回结果：写的什么函数？动态函数！